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Re: Caribbean - C A: Tropical Wave bring gusts to NE Caribbean

#12021 Postby cycloneye » Wed Jul 04, 2012 6:46 pm

TROPICAL WEATHER OUTLOOK
NWS NATIONAL HURRICANE CENTER MIAMI FL
800 PM EDT WED JUL 4 2012

FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...

A TROPICAL WAVE OVER THE EASTERN CARIBBEAN SEA IS PRODUCING
DISORGANIZED SHOWERS AND THUNDERSTORMS AS IT MOVES RAPIDLY WESTWARD
AT 20 TO 25 MPH. UPPER-LEVEL WINDS ARE NOT CONDUCIVE FOR
DEVELOPMENT...AND THIS SYSTEM HAS A LOW CHANCE...NEAR 0 PERCENT...
OF BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.

ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE
NEXT 48 HOURS.

$$
FORECASTER PASCH
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Re: Caribbean - C A: Tropical Wave bring gusts to NE Caribbean

#12022 Postby cycloneye » Wed Jul 04, 2012 8:09 pm

Here is a loop of the Tropical Wave moving thru the NE Caribbean.

Image
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Re: Caribbean - C A: Tropical Wave bring gusts to NE Caribbean

#12023 Postby cycloneye » Wed Jul 04, 2012 10:32 pm

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE SAN JUAN PR
1126 PM AST WED JUL 4 2012

.UPDATE...A TROPICAL WAVE EXTENDING FROM THE CARIBBEAN WATERS
NORTHEAST ACROSS PUERTO RICO LATE THIS WEDNESDAY EVENING...WILL
CONTINUE MOVING WEST NORTHWEST ACROSS THE REMAINDER OF THE LOCAL
AREA OVERNIGHT THROUGH THURSDAY. EXPECT VARIABLY TO MOSTLY
CLOUDY SKIES ACROSS THE LOCAL ISLANDS OVERNIGHT...WITH SCATTERED
TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS. INHERITED SHORT
TERM GRIDS AND ZFP HAD A GOOD HANDLE ON EXPECTED CONDITIONS
OVERNIGHT...BUT SENT A QUICK UPDATE TO BOTH...MAINLY TO KEEP THE
FORECAST CURRENT WITH ONGOING AND FORECASTED CONDITIONS. FOR THE
COASTAL WATERS...MADE A COUPLE OF ALTERATIONS TO THE PREVIOUS
CWF...INCLUDING REMOVING BRIEF SMALL CRAFT ADVISORY FOR SOME
SOUTHERN WATERS DURING THURSDAY...AS MODELS HAVE BACKED OFF A BIT
ON EXPECTED WINDS...OTHERWISE NO CHANGES. HOWEVER...SMALL BOAT
OPERATORS SHOULD CONTINUE TO EXERCISE CAUTION ACROSS MOST OF THE
LOCAL COASTAL WATERS OVERNIGHT.
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Re: Caribbean - C A: Tropical Wave moving thru NE Caribbean

#12024 Postby cycloneye » Thu Jul 05, 2012 5:52 am

Good morning. It has been a wet overnight hours in PR with some heavy showers with thunder. For today we can expect more rain as the tail of wave moves thru.


AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
446 AM AST THU JUL 5 2012

.SYNOPSIS...AT UPPER LEVELS...HIGH PRESSURE CONTINUES TO DOMINATE
THE EASTERN CARIBBEAN THROUGH MID-WEEK NEXT WEEK. LOW PRESSURE
THEN ENTERS THE EASTERN CARIBBEAN ON THURSDAY AND MOVES ACROSS
PUERTO RICO OVER THE FOLLOWING WEEKEND.

AT MID LEVELS...A WEAK HIGH PRESSURE RIDGE CONTINUES ACROSS THE
ATLANTIC BETWEEN 20 AND 30 NORTH LATITUDE. HIGH PRESSURE FORMS IN
THE ATLANTIC ON MONDAY AND STRENGTHENS AS IT MOVES INTO THE
CENTRAL ATLANTIC...PEAKING WEDNESDAY AND THURSDAY. A TROUGH MOVES
SOUTH OF THE HIGH AND INTO THE EASTERN CARIBBEAN ON FRIDAY.

AT LOWER LEVELS...THE LAST LEG OF A TROPICAL WAVE OVER THE U.S.
VIRGIN ISLANDS WILL MOVE ACROSS PUERTO RICO TODAY. SOME MOISTURE
WILL TRAIL THIS WAVE BUT A GRADUAL DRYING TREND WILL SET UP
TONIGHT THROUGH SATURDAY. MODERATE TO FRESH TRADE WINDS WILL
CONTINUE DUE TO HIGH PRESSURE THAT CONTINUES TO DOMINATE THE
ATLANTIC AND EXTENDS FARTHER WEST TOWARD THE UNITED STATES LATER
NEXT WEEK. A WEAK TROPICAL WAVE WILL PASS MAINLY SOUTH OF THE AREA
ON TUESDAY WITH A SECOND TOWARD THE END OF THE WEEK. NEITHER WAVE IS
EXPECTED TO BE AS STRONG AS THE PRESENT WAVE.

&&

.DISCUSSION...SHOWERS AND THUNDERSTORMS WITH FREQUENT LIGHTNING
HAVE GROWN IN COVERAGE AND INTENSITY SINCE MIDNIGHT BUT DIMINISHED
SINCE 05/08Z. PART OF THIS BAND WAS CROSSING THROUGH VIEQUES AS OF
05/08Z...BUT MUCH OF THE ATLANTIC AND CARIBBEAN WATERS ARE WITHIN
10 OR 15 MILES OF SOME ACTIVE SHOWERS OR THUNDERSTORMS. THE BAND
IS EXPECTED TO CONTINUE ACROSS PUERTO RICO DURING THE MORNING
HOURS BRINGING SHOWERS AND THUNDERSTORMS...SOME WITH VERY HEAVY
RAINFALL. AT THIS TIME ONLY URBAN AND SMALL STREAM FLOODING IS
EXPECTED AS SHOWERS HAVE BEEN MOVING AT ALMOST 30 KNOTS TOWARD THE
WEST NORTHWEST. SOME OF THESE THUNDERSTORMS HAVE THE POTENTIAL FOR
SOME VERY STRONG WIND GUSTS...AND WINDS HIGHER THAN 45 KNOTS HAVE
BEEN SEEN ON THE DOPPLER RADAR JUST BELOW 5 THOUSAND FEET. THESE
ARE LIKELY TO AFFECT SOUTHEAST PUERTO RICO SOMETIME BEFORE 6 AM
AST...BUT NOT WITH THE FULL FORCE NOTED AT 5 THOUSAND FEET. BOTH
THE NAM AND THE GFS NOTE VERY UNSTABLE LIFTED INDICES THAT
CONTINUE INTO TONIGHT AND FRIDAY. AT THIS TIME THERE IS NO REAL
AGREEMENT ON MOISTURE BETWEEN THE THREE MAIN MODELS. THE 12 HOUR
ACCUMULATION IN THE NAM12 LEAVES NO RAIN OVER SAN JUAN ON
TODAY...THE GFS IS AGGRESSIVE DURING THE MORNING HOURS BUT
DROPS POPS BELOW 50 PERCENT AFTER 05/18Z...THE ECMWF HAS GOOD
MOISTURE AT 05/12Z BUT BEGINS DRYING THE AREA OUT AT 06/00Z AND
THE NAM5 ACTUALLY RAMPS POPS UP AFTER 06/00Z TO BRING A BETTER
CHANCE OF RAIN...AT LEAST FOR THE U.S. VIRGIN ISLANDS AND EASTERN
PUERTO RICO TONIGHT. CURRENTLY THE MAIN AREA OF CONVECTION
APPEARS TO BE MOVING THROUGH THE FORECAST AREA AND SHOULD LEAVE BY
THIS AFTERNOON. BUT SOME UPPER LEVEL DIVERGENCE AND INSTABILITY
REMAIN AND MIMIC SHOWS THE BACK EDGE OF THE PRECIPITABLE
WATER...CURRENTLY EAST OF 60 WEST...MOVING MORE SLOWLY TOWARD
PUERTO RICO THAN IT HAD BEEN. THIS SUGGESTS THAT A LITTLE EXTRA
MOISTURE BEING ADDED TO THE BACK SIDE OF THE WAVE COUPLED WITH
CONTINUED INSTABILITY FAVOR THE FORMATION OF SHOWERS AND
THUNDERSTORMS OVER THE CARIBBEAN AND ATLANTIC WATERS EAST OF
PUERTO RICO INTO THE EVENING AND HAVE THEREFORE LEANED THE
FORECAST IN THIS DIRECTION. FROM THERE EXPECT DRYING THROUGH
SATURDAY. AN AREA OF MOISTURE CAN BE SEEN IN THE CENTRAL ATLANTIC
STRETCHING FROM 24 NORTH 45 WEST TO 14 NORTH 38 WEST BEHIND A WEAK
MID-LEVEL TROUGH THAT APPEARS TO BE HEADED OUR WAY AND WILL LIKELY
ADD TO SHOWER ACTIVITY OVER THE WEEKEND. IN FACT SOME WRAP-AROUND
FROM THE CURRENT WAVE MAY ALSO RETURN ON FRIDAY TO KEEP POPS
HIGHER THAN THE DUSTY AIR BEHIND THE WAVE WOULD SUGGEST. AFTER THE
WEEKEND THE GFS SUGGESTS A WEAK WAVE ON TUESDAY...THAT PASSES
MAINLY SOUTH AND ANOTHER TOWARD THE END OF THE WEEK. THESE WAVES
APPEAR MORE FRAGMENTED AND ARE PERHAPS JOINED BY IMPULSES
ORIGINATING OVER THE CENTRAL ATLANTIC RATHER THAN OFF OF AFRICA.


&&

.AVIATION...THE LAST LEG OF A TROPICAL WAVE HAS SPREAD
TSRA FROM THE LEEWARD ISLANDS TO THE U.S. VIRGIN ISLANDS
AND THE ERN COAST OF PUERTO RICO. THESE ARE ACCOMPANIED BY
STRONG TURBULENCE AND MVFR AND LCLY IFR CONDS IN VERY HEAVY RAIN.
CONDS WILL MOVE ACROSS PUERTO RICO DURING THE DAY AND EXPECT
WIDESPREAD MTN OBSCURATIONS OVER THE AREA THRU 05/22Z. LLVL WINDS
ARE 15 TO 30 KNOTS...BUT SPOTS REACHING ALMOST 50 KNOTS HAVE BEEN
OBSERVED ON DOPPLER RADAR BETWEEN 4 AND 10 KFT. ISOLATED TOPS TO
ALMOST 60 KFT HAVE BEEN OBSERVED BUT MOST AREAS ARE BELOW 30 KFT.


&&

.MARINE...SEAS WILL BE NEAR 6 FEET IN MANY AREAS TODAY AND
TONIGHT...SUBSIDING SLOWLY AFTER THAT. THUNDERSTORMS IN THE AREA
TODAY MAY DRIVE SEAS LOCALLY HIGHER...AND SMALL CRAFT SHOULD
EXERCISE CAUTION ACROSS THE LOCAL WATERS FOR SQUALLY CONDITIONS.
SCATTERED SHOWERS WILL CONTINUE INTO THE WEEKEND BUT SOME
IMPROVEMENT IS EXPECTED AFTER MIDNIGHT TONIGHT.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU 86 80 91 80 / 60 60 50 30
STT 88 80 90 80 / 90 60 50 50
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#12025 Postby Gustywind » Thu Jul 05, 2012 6:23 am

Here is a summary of the twave who has spread on us during the last 24/48H (sources Météo-France Guadeloupe). As many of your reports concerning the strong winds, Guadeloupe experienced strong gustywinds too ( see report below). For now, the butterfly island back off the yellow alert and now back to green code meaning not threat. Again, nothing exceptionnal in terms of rainfall but a smart way to alivate the citerns,etc. :). Whereas, as many islanders we're always waiting for very strong and actives twaves to cut off the impressive and persisting drought. For info, and again... yesterday temperatures reach 34°C and 33°C respectively at Sainte Rose and le Moule.

Current situation and Forecast

The tropical wave that crossed the Caribbean arc is moving away towards the Caribbean Sea. The active part is now close to Puerto Rico, away from our islands. A few occasional scattered showers linger at the beginning of the day, but should gradually diminish, the clouds being replaced by an dry and misty air.

Encrypted data of the episode and comments

Accumulations of water during this episode is around 10 millimeters on the coast, approximately 20 millimeters on the Great Fund, 40 millimeters on the mountains of Basse-Terre and up to 60 mm on the peaks. Thunderstorms have been regularly observed, including yesterday evening and during the night. Good wind gusts were also identified during the episode,with peaks exceeding 70 km/h at la Désirade, and 60 km/h at Sainte-Anne and Marie-Galante.
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#12026 Postby Gustywind » Thu Jul 05, 2012 6:38 am

Image
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Re: Caribbean - C A: Tropical Wave moving thru NE Caribbean

#12027 Postby cycloneye » Thu Jul 05, 2012 6:54 am

Steady light to moderate rain is falling in many areas of the island early this morning. Let's see how the rest of today goes.
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Re: Caribbean - C A: Tropical Wave moving thru NE Caribbean

#12028 Postby cycloneye » Thu Jul 05, 2012 10:30 am

Hopefully,I will have power to continue posting reports from here.

SEVERE THUNDERSTORM WARNING
PRC007-021-025-035-041-045-061-105-129-051600-
/O.NEW.TJSJ.SV.W.0003.120705T1524Z-120705T1600Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
1124 AM AST THU JUL 5 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
AGUAS BUENAS MUNICIPALITY IN PUERTO RICO...
BAYAMON MUNICIPALITY IN PUERTO RICO...
CAGUAS MUNICIPALITY IN PUERTO RICO...
THIS INCLUDES THE CITY OF CAGUAS...
CAYEY MUNICIPALITY IN PUERTO RICO...
THIS INCLUDES THE CITY OF CAYEY...
CIDRA MUNICIPALITY IN PUERTO RICO...
THIS INCLUDES THE CITY OF CIDRA...
COMERIO MUNICIPALITY IN PUERTO RICO...
THIS INCLUDES THE CITY OF COMERIO...
GUAYNABO MUNICIPALITY IN PUERTO RICO...
NARANJITO MUNICIPALITY IN PUERTO RICO...
SAN LORENZO MUNICIPALITY IN PUERTO RICO...

* UNTIL NOON AST

* AT 1119 AM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER CIDRA AND AGUAS BUENAS...MOVING NORTHWEST
AT 30 MPH. THIS SEVERE STORM WILL AFFECT THE NEARBY MUNICIPALITIES
AS MOVES TO THE NORTHWEST. WINDS BETWEEN 50 TO 65 MPH ARE LIKELY
WITH THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS. SEEK SHELTER
NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 1809 6597 1808 6602 1810 6602 1811 6605
1809 6613 1804 6613 1805 6620 1810 6623
1814 6622 1817 6623 1819 6626 1823 6626
1825 6629 1828 6623 1829 6605
TIME...MOT...LOC 1521Z 152DEG 56KT 1833 6617

$$

ER/GV
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Re: Caribbean - C A: Tropical Wave moving thru NE Caribbean

#12029 Postby Gustywind » Thu Jul 05, 2012 12:46 pm

cycloneye wrote:Hopefully,I will have power to continue posting reports from here.

SEVERE THUNDERSTORM WARNING
PRC007-021-025-035-041-045-061-105-129-051600-
/O.NEW.TJSJ.SV.W.0003.120705T1524Z-120705T1600Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN JUAN PR
1124 AM AST THU JUL 5 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
AGUAS BUENAS MUNICIPALITY IN PUERTO RICO...
BAYAMON MUNICIPALITY IN PUERTO RICO...
CAGUAS MUNICIPALITY IN PUERTO RICO...
THIS INCLUDES THE CITY OF CAGUAS...
CAYEY MUNICIPALITY IN PUERTO RICO...
THIS INCLUDES THE CITY OF CAYEY...
CIDRA MUNICIPALITY IN PUERTO RICO...
THIS INCLUDES THE CITY OF CIDRA...
COMERIO MUNICIPALITY IN PUERTO RICO...
THIS INCLUDES THE CITY OF COMERIO...
GUAYNABO MUNICIPALITY IN PUERTO RICO...
NARANJITO MUNICIPALITY IN PUERTO RICO...
SAN LORENZO MUNICIPALITY IN PUERTO RICO...

* UNTIL NOON AST

* AT 1119 AM AST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER CIDRA AND AGUAS BUENAS...MOVING NORTHWEST
AT 30 MPH. THIS SEVERE STORM WILL AFFECT THE NEARBY MUNICIPALITIES
AS MOVES TO THE NORTHWEST. WINDS BETWEEN 50 TO 65 MPH ARE LIKELY
WITH THIS STORM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS. SEEK SHELTER
NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 1809 6597 1808 6602 1810 6602 1811 6605
1809 6613 1804 6613 1805 6620 1810 6623
1814 6622 1817 6623 1819 6626 1823 6626
1825 6629 1828 6623 1829 6605
TIME...MOT...LOC 1521Z 152DEG 56KT 1833 6617

$$

ER/GV

Waouw :eek: , be aware Cycloneye, this twave continues to generate big thunderstorms. Thanks to you for posting :) in spite of the conditions!
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Re: Caribbean - C A: Tropical Wave moving thru NE Caribbean

#12030 Postby underthwx » Thu Jul 05, 2012 1:01 pm

sounds like yall have your hands full in the region...can you give an estimate of how much rain has fallen thus far?...and how much more precip can be expected?...and above all else...please stay out of harms way my friends...
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Re: Caribbean - C A: Tropical Wave moving thru NE Caribbean

#12031 Postby cycloneye » Thu Jul 05, 2012 1:19 pm

So far between 2-4 inches is what this wave has brought for Puerto Rico,sufficient to fill the lakes,end the many forest fires that have been occuring,end the 90+ maximun temperatures,turn from yellow to green the yards of the houses among other things.But it almost over as the tail of the wave moves slowly away from PR.Good weather is expected from Friday and thru the weekend with the usual afternoon showers in the interior west section.
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Re: Caribbean - Central America Weather

#12032 Postby cycloneye » Thu Jul 05, 2012 2:32 pm

It all ends tonight and a return to dry and hazy weather will occur from Friday going thru the weekend.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
319 PM AST THU JUL 5 2012

.SYNOPSIS...THE TRAILING EDGE OF A TROPICAL WAVE NOW CROSSING
PUERTO RICO THIS AFTERNOON WILL CONTINUE TO MOVE WEST AND AWAY
FROM THE REGION TONIGHT...BUT MOISTURE WILL LINGER ACROSS THE MONA
PASSAGE THROUGH FRIDAY MORNING. A WEAK UPPER RIDGE CONTINUES
ACROSS THE EASTERN CARIBBEAN. A MID LEVEL RIDGE REMAINS JUST
NORTHEAST OF THE FORECAST AREA. WEATHER CONDITIONS WILL IMPROVE
FRIDAY AND SATURDAY AS A DRIER AIR MASS WITH SAHARAN DUST MOVES
OVER THE AREA.

&&

.DISCUSSION...AREAS OF STRONG CONVECTION ASSOCIATED WITH THE
AFOREMENTIONED TROPICAL WAVE PRODUCED TORRENTIAL RAINFALL...CLOUD
TO GROUND LIGHTNING AND STRONG GUSTY WINDS OVER THE EASTERN HALF
OF PUERTO RICO DURING LATE MORNING AND AFTERNOON HOURS. IN THE
TRAILING EDGE OF THE TROPICAL WAVE A SEVERE STORM FORMED AND MOVED
FROM PATILLAS NORTHWESTWARD TO VEGA BAJA. SOME REPORTS OF POWER
OUTAGES...DOWNED TREES AND STRONG WINDS WERE RECEIVED WITH THIS
SEVERE STORM. THE REST OF PUERTO RICO...CULEBRA...VIEQUES AND USVI
RECEIVED MAINLY LIGHT TO MODERATE RAINFALL.

WEATHER CONDITIONS WILL GRADUALLY IMPROVE LATE TONIGHT THROUGH FRIDAY
MORNING AS THE TROPICAL WAVE MOVES WESTWARD INTO HISPANOLA. ALL
OPERATIONAL MODELS SUGGEST THAT THE MOISTURE WILL DECREASE RAPIDLY
ACROSS THE FORECAST AREA LATE TONIGHT. PWAT WILL SUBSIDE FROM 2.1 TO
1.4 INCHES ON SATURDAY. WINDS WILL SHIFT FROM THE EAST TO EAST-
NORTHEAST ON SUNDAY MORNING. A RELATIVELY DRIER AIR MASS WITH SAHARAN
DUST WILL MOVE ACROSS THE ISLANDS FRIDAY AND SATURDAY...LIMITING
THE SHOWER ACTIVITY ACROSS THE LOCAL AREA.

&&

.AVIATION....NRMS SHRA OVR TAF SITES WILL GRADUALLY DIMINISH THIS
AFTERNOON. HOWEVER XPCT VFR THROUGH TUE XCP FOR OBSCURING SOME MTNS
REST OF TODAY...AND IN ISOLD/SCT SHRA AT TIMES. LLVL WINDS WILL BE E
TO ESE 15 TO 30 KT.

&&

.MARINE...SEAS WILL BE NEAR 6 FEET IN MANY AREAS TODAY AND
TONIGHT...SUBSIDING SLOWLY AFTER THAT. THUNDERSTORMS ACROSS THE
SURROUNDING WATERS MAY DRIVE SEAS LOCALLY HIGHER. SCATTERED
SHOWERS WILL CONTINUE INTO THE WEEKEND BUT A GRADUAL IMPROVEMENT
IS EXPECTED AFTER MIDNIGHT TONIGHT.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU 80 91 80 89 / 40 40 30 30
STT 80 90 80 89 / 40 40 50 50
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Re: Caribbean - Central America Weather

#12033 Postby cycloneye » Thu Jul 05, 2012 3:19 pm

The big severe thunderstorm that moved thru the Eastern half of PR on Thursday caused many trees to go down with also some power outages.Below is the news about all of what occured with the wave passage thru Puerto Rico.

http://www.elnuevodia.com/deslizamiento ... 93729.html

Image

Image
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#12034 Postby Gustywind » Thu Jul 05, 2012 4:48 pm

:uarrow:
Impressive sat pics Cycloneye. :eek: That was a real and pretty severe thunderstorm in your area!
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Re: Caribbean - Central America Weather

#12035 Postby underthwx » Thu Jul 05, 2012 6:36 pm

Hi CE....looking at the satellite image I must say that the tropical wave is in appearance very impressive in comparison to earlier images...is the wave on a heading for the Gulf of Mexico?...
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Re: Caribbean - Central America Weather

#12036 Postby cycloneye » Fri Jul 06, 2012 5:36 am

Good morning. No big rainmaker events are forecast for the next few days.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
516 AM AST FRI JUL 6 2012

.SYNOPSIS...A MID LEVEL RIDGE REMAINS JUST NORTHEAST OF THE
FORECAST AREA. WEATHER CONDITIONS WILL IMPROVE FRIDAY AND SATURDAY
AS A DRIER AIR MASS WITH SAHARAN DUST MOVES OVER THE AREA.

&&

.DISCUSSION...THE TROPICAL WAVE WHICH THE BACK EDGE AFFECTED THE
REGION YESTERDAY CONTINUED TO MOVE WEST AND AWAY FROM THE LOCAL
REGION. AT THIS MOMENT THIS WAVE WAS LOCATED OVER HAITI. A MUCH
DRIER AIR MASS WILL PREVAIL OVER THE REGION TODAY AS A SURFACE HIGH
PRESSURE ACROSS THE NORTH CENTRAL ATLANTIC WILL GENERATE A MORE
STABLE ATMOSPHERE ACROSS THE REGION. ALTHOUGH LIMITED...LINGERING
MOISTURE COULD INTERACT WITH LOCAL EFFECTS AND GENERATE ISOLATED
TO SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS THIS AFTERNOON
MAINLY OVER THE WESTERN PORTIONS OF PUERTO RICO. TODAY MAIN
CONCERN WILL THE INCREASING SAHARAN DUST ACROSS THE REGION.

SATELLITE IMAGES ARE SHOWING AN AREA OF LOW LEVEL MOISTURE ABOUT 250
MILES EAST OF THE ISLAND OF ST MARTIN. THIS AREA OF LOW LEVEL
MOISTURE COULD BE REACHING THE LOCAL FORECAST AREA LATE TONIGHT
AND EARLY SATURDAY MORNING...INCREASING SLIGHTLY THE SHOWER AND
CLOUD COVERAGE ACROSS THE EASTERN PUERTO RICO AND THE U.S. VIRGIN
ISLANDS. THE HIGH PRESSURE TO THE NORTHEAST WILL BE THE MAIN
LIMITING FACTOR FOR THESE SHOWER DEVELOPMENT.

INCOMING WEEK...MODELS SUGGEST SEVERAL AREAS OF LOW LEVEL MOISTURE
MOVING ACROSS THE LOCAL FORECAST AREA. THEREFORE EXPECT SHOWERS IN
THE MORNING AFFECTING THE LOCAL ISLANDS AND EASTERN PORTIONS PUERTO
RICO AND AFTERNOON SHOWERS AND THUNDERSTORMS OVER THE WESTERN
PORTIONS OF THE ISLAND..


&&

.AVIATION...
.AVIATION...VFR CONDITIONS WILL PREVAIL ACROSS ALL TAF SITES THROUGH
AT LEAST 06/18Z. BRIEF PERIODS OF MVFR CONDITIONS WITH MOUNTAIN
OBSCURATIONS CAN BE EXPECTED BETWEEN 06/18Z-06/22Z AT TJMZ AND TJBQ.
HAZY CONDITIONS ARE EXPECTED TO AFFECT MOST TAF SITES...HOWEVER...
VISIBILITIES WILL REMAIN VFR FOR NOW. WINDS WILL CONTINUE MAINLY
EAST AT 10 TO 15 KTS AT THE SURFACE.


&&

.MARINE...A SURFACE HIGH PRESSURE CENTERED ACROSS THE NORTH
CENTRAL ATLANTIC WILL MAINTAIN MODERATE TO FRESH TRADE WINDS
ACROSS THE REGIONAL WATERS THROUGH AT LEAST SATURDAY. FOR THIS
REASON MARINERS ARE URGED TO EXERCISE A CAUTIONS ACROSS PUERTO
RICO AND USVI LOCAL WATERS DUE TO STRONG WINDS. THE WINDS ARE
FORECAST TO RELAX AFTER SATURDAY NIGHT.


&&

.PRELIMINARY POINT TEMPS/POPS...
SJU 89 78 90 79 / 20 30 30 40
STT 90 79 90 80 / 20 50 50 40
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Re: Caribbean - Central America Weather

#12037 Postby cycloneye » Fri Jul 06, 2012 7:50 pm

Posting tonight the afternoon discussion as I was without internet for a few hours.


AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
259 PM AST FRI JUL 6 2012

.SYNOPSIS...UPPER RIDGE OVER THE NORTHEAST CARIBBEAN/TROPICAL
ATLANTIC CONTINUES TO PROMOTE A SUBSIDENCE PATTERN ACROSS THE
LOCAL REGION. A MID LEVEL RIDGE REMAINS JUST NORTH OF THE GREATER
ANTILLES. STRONG SURFACE HIGH PRESSURE OVER THE NORTH CENTRAL
ATLANTIC IS MAINTAINING A LONG FETCH EAST TO EAST-SOUTHEAST WINDS
ACROSS THE LOCAL REGION.

&&

.DISCUSSION...SATELLITE DERIVED TPW ANALYSIS SHOWS A RELATIVELY
DRIER AIR MASS IN THE WAKE OF THE TROPICAL WAVE THAT IS NOW LOCATED
BETWEEN HISPANOLA AND CUBA. THIS DRIER AIR MASS WILL CONTINUE TO
FILTER ACROSS THE LOCAL AREA...LIMITING THE SHOWER ACTIVITY ACROSS
PUERTO RICO AND USVI DURING THE NEXT FEW DAYS. HOWEVER...SATELLITE
IMAGERY INDICATED SEVERAL PATCHES OF LOW LEVEL MOISTURE EMBEDDED
IN THE TRADES ACROSS THE TROPICAL ATLANTIC AND EASTERN CARIBBEAN.
AS A RESULT...TRADE WIND WEATHER WILL DOMINATE THROUGH THE WEEKEND
INTO EARLY NEXT WEEK AS A STRONG SURFACE HIGH PRESSURE STAYS FAR
NORTHEAST OF THE FORECAST AREA AND THE SMALL AREAS OF LOW LEVEL
MOISTURE CROSS THE ISLANDS FROM TIME TO TIME. THEREFORE...EXPECT
ROUNDS OF LOW CLOUDS AND PASSING SHOWERS CARRIED BY THE WINDS
AFFECTING MAINLY WINDWARD AREAS EARLY IN THE MORNING...FOLLOWED
BY THE TYPICAL AFTERNOON CONVECTION OVER WESTERN PUERTO RICO.
BUT OVERALL...THE GENERAL TREND WILL BE FOR A RELATIVELY FAIR
WEATHER CONDITIONS ACROSS THE FORECAST AREA AT LEAST THROUGH
EARLY NEXT WEEK.

&&

.AVIATION...VFR EXPECTED ACROSS MOST OF THE TAFS SITES...EXCEPT
TJBQ AND WHERE BRIEF MVFR CONDS ARE POSSIBLE BETWEEN 06/18Z AND
06/22Z. MOUNTAIN OBSCURATIONS ARE ALSO POSSIBLE ACROSS THE WESTERN
INTERIOR OF PR. MVFR OTHER LOCATIONS SEEMS UNLIKELY THROUGH AT
LEAST SAT MORNING. LLVL WIND MAINLY E 15-20 KT.

&&

.MARINE...THE SURFACE HIGH PRESSURE OVER THE NORTH CENTRAL ATLANTIC
IS MAINTAINING A FRESH TRADE WIND FLOW ACROSS THE REGIONAL WATERS.
AS A RESULT...MARINERS ARE URGED TO EXERCISE A CAUTION ACROSS PUERTO
RICO AND USVI LOCAL WATERS DUE TO FRESH WINDS. SEAS WILL BE NEAR 6 FEET
IN MANY AREAS TODAY...GRADUALLY SUBSIDING DURING THE WEEKEND.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU 78 90 79 90 / 30 30 20 20
STT 79 90 80 89 / 50 50 20 20
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#12038 Postby cycloneye » Sat Jul 07, 2012 5:38 am

Good morning.Good weather in general is expected with hazy and warm next few days with only a few showers.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
511 AM AST SAT JUL 7 2012

.SYNOPSIS...SURFACE HIGH PRESSURE WILL CONTINUE TO DOMINATE THE
REGION NEXT FEW DAYS. UPPER LEVEL TROUGH IS FORECAST TO DEVELOP
OVER THE WESTERN ATLANTIC MID NEXT WEEK.

&&

.DISCUSSION...ONLY LIGHT PASSING SHOWERS WERE NOTED
OVERNIGHT...MAINLY OVER THE COASTAL WATERS. GENERALLY..DRY WEATHER
CONDITIONS WILL CONTINUE TO PREVAIL ACROSS THE REGION THROUGH AT
LEAST TUESDAY...AS A SURFACE HIGH PRESSURE SYSTEM CONTINUES TO
DOMINATE THE LOCAL REGION. SAHARAN DUST WILL CONTINUE TO AFFECT
THE LOCAL AREA THROUGH AT LEAST SUNDAY...WITH NAAPS AEROSOL MODEL
INDICATING ANOTHER ROUND OF SAHARAN DUST BY MID NEXT WEEK.
AN UPPER LEVEL TROUGH IS FORECAST TO DEVELOP OVER THE WESTERN
ATLANTIC MID NEXT WEEK...WHICH WILL HELP TO DESTABILIZE THE LOCAL
ATMOSPHERE SOMEWHAT...ENHANCING THE DEVELOPMENT OF AFTERNOON
SHOWERS WITH POSSIBLE THUNDERSTORM ACTIVITY MAINLY OVER THE
WESTERN INTERIOR AND MOUNTAIN SECTIONS OF PUERTO RICO. IN THE
MEANTIME...ONLY PATCHES OF LOW LEVEL MOISTURE ARE EXPECTED TO
AFFECT THE REGION FROM TIME TO TIME.


&&

.AVIATION...VFR CONDITIONS WILL PREVAIL ACROSS ALL TAF SITES THROUGH
AT LEAST 07/18Z. BRIEF PERIODS OF MVFR CONDITIONS WITH MOUNTAIN
OBSCURATIONS CAN BE EXPECTED BETWEEN 07/18Z-07/22Z AT TJMZ AND
TJBQ. HAZY CONDITIONS ARE EXPECTED TO AFFECT MOST TAF
SITES...HOWEVER...VISIBILITIES WILL REMAIN VFR FOR NOW. WINDS WILL
CONTINUE MAINLY EAST AT 10 TO 15 KTS AT THE SURFACE.


&&

.PRELIMINARY POINT TEMPS/POPS...
SJU 89 79 89 79 / 20 20 20 20
STT 89 79 89 80 / 20 20 20 20
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Re: Caribbean - Central America Weather

#12039 Postby cycloneye » Sat Jul 07, 2012 2:44 pm

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE SAN JUAN PR
253 PM AST SAT JUL 7 2012

.SYNOPSIS...A GENERALLY FAIR WEATHER PATTERN WILL CONTINUE TO
PREVAIL DURING THE NEXT TWO DAYS OR SO AS A RIDGE ALOFT PERSISTS
OVER THE FORECAST AREA. UPPER LEVEL TROUGH IS THEN FORECAST TO
DEVELOP ACROSS THE WESTERN ATLANTIC BY MID WEEK.

&&

DISCUSSION...RIDGE PATTERN ALOFT WILL CONTINUE TO PERSIST ACROSS
THE LOCAL AREA FOR THE NEXT FEW DAYS. THIS FEATURE WILL CONTINUE
TO PROMOTE MAINLY DRY AND STABLE CONDITIONS ACROSS THE LOCAL
ISLANDS. HOWEVER...PATCHES OF LOW LEVEL MOISTURE EMBEDDED IN THE
TRADES WILL INTERACT WITH LOCAL EFFECTS AND DIURNAL HEATING TO
PRODUCE CLOUDINESS...SHOWERS AND ISOLATED THUNDERSTORMS ACROSS
PORTIONS OF THE LOCAL ISLANDS EACH AFTERNOON. FOR MID WEEK...AN
UPPER LEVEL TROUGH IS THEN FORECAST TO DEVELOP ACROSS THE WESTERN
ATLANTIC...RESULTING IN A BETTER CHANCE FOR SHOWER ACTIVITY.
MEANWHILE...AT LOW LEVELS...A STRONG SURFACE HIGH PRESSURE ACROSS
THE NORTH CENTRAL ATLANTIC WILL CONTINUE TO PROMOTE A MODERATE TO
LOCALLY FRESH EAST TO NORTHEAST WIND FLOW...BECOMING EAST TO
SOUTHEAST ON MONDAY/TUESDAY.

TO SUMMARIZE...UNDER THE PREVAILING WIND FLOW...CONTINUE TO
EXPECT A FEW PASSING SHOWERS ACROSS THE EAST COASTAL SECTIONS
OF THE ISLANDS DURING THE MORNING HOURS...FOLLOWED BY AFTERNOON
CONVECTION WHICH WILL BE MAINLY FOCUSED ACROSS WESTERN PORTIONS
OF PUERTO RICO. SOME OF THESE SHOWERS AND THUNDERSTORMS WILL BE
CAPABLE OF PRODUCING MODERATE TO LOCALLY HEAVY RAINFALL. THIS
WEATHER SCENARIO MAY CHANGE BY MID WEEK AS AFOREMENTIONED UPPER
TROUGH DEVELOPS ACROSS THE WESTERN ATLANTIC ENHANCING SOMEWHAT
THE SHOWER DEVELOPMENT ACROSS THE AREA.

&&

.AVIATION...SCT SHRA/ISOLD TSRA TO DIMINISH LATE AFT IN SW PR.
OTHW PR/USVI WILL BE VFR XCP REMOTE PSBL SHRA TONIGHT. LLVL WIND
E 10-20 KT BCMG 10-15 KT OVERNIGHT.

&&

.MARINE...TRANQUIL MARINE CONDITIONS WILL CONTINUE TO PREVAIL
ACROSS THE LOCAL WATERS WITH SEAS UP TO 5 FEET AND WINDS UP TO
18 KNOTS THROUGH AT LEAST NEXT TUESDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
SJU 79 90 79 90 / 20 20 20 20
STT 79 89 80 89 / 20 20 30 30
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Re: Caribbean - Central America Weather

#12040 Postby cycloneye » Sat Jul 07, 2012 10:29 pm

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
1050 PM AST SAT JUL 7 2012

.UPDATE...ISOLATED QUICK PASSING SHOWERS ARE EXPECTED TO CONTINUE
THROUGH THE NIGHT ACROSS THE LOCAL WATERS...USVI...AND NORTHERN
AND EASTERN PUERTO RICO. LATEST GUIDANCE SUGGESTS THAT ON SUNDAY
MORNING SHOWERS WILL DEVELOP ACROSS THE NORTHERN SLOPES OF PUERTO
RICO WITH AN EASTERLY WIND...THEN...EARLY IN THE
AFTERNOON...SHOWERS AND THUNDERSTORMS WILL DEVELOP ACROSS THE
WESTERN SECTIONS OF PUERTO RICO. SEA BREEZE CONVERGENCE AND
DIVERGENCE IN THE UPPER LEVELS MAY TRIGGER THUNDERSTORMS ACROSS
THE WESTERN TO SOUTHWESTERN PUERTO RICO...HOWEVER...0-6KM MEAN
WIND AND 0-6KM STORM MOTION IS EXPECTED TO BE FROM THE EAST TO
EAST SOUTHEAST ACCORDING TO FORECAST SOUNDINGS...SO THE SHOWERS
THAT DO DEVELOP MAY ACTUALLY MOVE WEST TO WEST NORTHWEST.

BASED ON THE CURRENT GUIDANCE...A FEW CHANGES WERE MADE TO THE
SHORT TERM FORECAST GRIDS...BUT BEYOND 24 HOURS...EVERYTHING
SEEMED CONSISTENT WITH THE LATEST GUIDANCE SO NO CHANGES WERE MADE.
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