Major derecho - May 8 - Plains to Ohio Valley (beyond?)

[Pedro Fernández]

VIS SAT Image 13:25 CDT

WOW...

What name would you give to this system? It began as a Mesoescale Convective Complex.... But, some hours after, it seems a low... I have never seen something like that before

[CrazyC83]

http://radar.weather.gov/radar_lite.php ... R&loop=yes

Eye looking better than ever...could it soon be clear on satellite?

[CrazyC83]

VIS SAT Image 13:25 CDT

WOW...

What name would you give to this system? It began as a Mesoescale Convective Complex.... But, some hours after, it seems a low... I have never seen something like that before

Tropical Storm (Hurricane?) Ana?

[KatDaddy]

106 mph!

1825 106 CARBONDALE JACKSON IL 3772 8922 MEASURED AT A PRIVATE RESIDENCE. (PAH)

[CrazyC83]

SEVERE THUNDERSTORM WARNING
ILC047-059-185-193-INC051-129-163-KYC101-225-082015-
/O.NEW.KPAH.SV.W.0110.090508T1916Z-090508T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PADUCAH KY
216 PM CDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN PADUCAH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
IN NORTHWEST KENTUCKY...
WESTERN HENDERSON COUNTY...
NORTHERN UNION COUNTY...
IN SOUTHEAST ILLINOIS...
EDWARDS COUNTY...
WABASH COUNTY...
EASTERN WHITE COUNTY...
NORTHEASTERN GALLATIN COUNTY...
IN SOUTHWEST INDIANA...
GIBSON COUNTY...
POSEY COUNTY...
VANDERBURGH COUNTY...

* UNTIL 315 PM CDT.

* AT 211 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
EXCESS OF 80 MPH. THIS STORM WAS LOCATED 20 MILES SOUTHWEST OF
CROSSVILLE...MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IN THE WARNED AREA INCLUDE...
NEW HARMONY...
BLAIRSVILLE...
POSEYVILLE...
CYNTHIANA...
HAUBSTADT...
FORT BRANCH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. SEEK SHELTER INDOORS. STAY TUNED TO
WEATHER RADIO OR LOCAL MEDIA FOR THE LATEST SEVERE WEATHER
INFORMATION.

THIS STORM HAS A HISTORY OF PRODUCING WINDS OVER 80 MPH AND
WIDESPREAD WIND DAMAGE. SEEK SHELTER INDOORS. CONTINUE TO MONITOR
WEATHER RADIO OR LOCAL MEDIA FOR THE LATEST SEVERE WEATHER
INFORMATION.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT FRIDAY AFTERNOON
FOR SOUTHEASTERN ILLINOIS AND SOUTHWEST INDIANA AND WESTERN KENTUCKY.

&&

LAT...LON 3850 8764 3846 8775 3842 8773 3846 8767
3845 8762 3850 8758 3851 8754 3850 8751
3852 8749 3769 8747 3769 8815 3858 8813
3858 8767
TIME...MOT...LOC 1913Z 246DEG 39KT 3795 8827

$$

[CrazyC83]

MESOSCALE DISCUSSION 0763
NWS STORM PREDICTION CENTER NORMAN OK
0216 PM CDT FRI MAY 08 2009

AREAS AFFECTED...SRN IL..SRN IND...WRN KY...SERN MO...NERN AR AND
WRN THROUGH MIDDLE TN

CONCERNING...TORNADO WATCH 267...

VALID 081916Z - 082045Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 267 CONTINUES.

GREATEST THREAT FOR MORE WIDESPREAD DAMAGING WIND STILL APPEARS TO
BE ALONG LEADING GUST FRONT FROM N CNTRL TN...WRN KY INTO SWRN IND
AS WELL AS IN COMMA HEAD REGION OVER SRN IL. THREAT FOR ISOLATED
TORNADOES APPEARS TO BE GREATEST ACROSS MIDDLE AND PARTS OF WRN TN
BUT CONDITIONAL UPON ADDITIONAL STORM DEVELOPMENT. LARGE HAIL AND A
MORE ISOLATED DAMAGING WIND THREAT EXISTS FARTHER WEST ACROSS NERN
AR INTO WRN TN.

THIS AFTERNOON AN ORGANIZED MESOSCALE SYSTEM WITH A COMMA HEAD OVER
SRN IL AND BOWING LINE FARTHER SE ACROSS WRN KY INTO NRN PORTIONS OF
MIDDLE TN IS MOVING EAST AT AROUND 50 KT. THREAT FOR DAMAGING WIND
WILL CONTINUE WITH THIS FEATURE NEXT FEW HOURS...ESPECIALLY WITH
BOWING SEGMENT AS WELL AS WITHIN COMMA HEAD REGION. STORMS HAVE
BECOME MORE DISCRETE IN NATURE ALONG SRN END OF THE LINE ACROSS
MIDDLE TN...CONCURRENT WITH INCREASING 0-2 KM WINDS...PER 18Z BNA
SOUNDING AND VWP DATA...ASSOCIATED WITH A NEWD DEVELOPING LOW LEVEL
JET. THREAT FOR ISOLATED TORNADOES APPEARS GREATEST IN THIS REGION
NEXT COUPLE HOURS. FARTHER WEST ALONG TRAILING E-W PORTION OF THE
BOUNDARY ACROSS NERN AR...THE SWLY LOW LEVEL JET CONTINUES TO
PROMOTE THUNDERSTORM DEVELOPMENT PRIMARILY JUST NORTH OF THE
BOUNDARY. SWD DEVELOPMENT COULD BE LIMITED BY A CAP IN WARM SECTOR.
HOWEVER...STORMS THAT ARE TRAINING EWD IN THIS REGION WITH HAVE THE
POTENTIAL TO PRODUCE ISOLATED LARGE HAIL...VERY HEAVY RAIN AND
POSSIBLE ISOLATED STRONG WIND GUSTS. THERE IS ALSO SOME CONCERN THAT
STORMS DEVELOPING ALONG TRAILING OUTFLOW BOUNDARY COULD BECOME
SURFACE BASED AND DEVELOP A LITTLE FARTHER SEWD...WHICH WOULD
INCREASE THE THREAT OF DAMAGING WIND AND ISOLATED TORNADOES. THE 18Z
RAOB FROM LIT INDICATES THE CAP HAS WEAKENED SOMEWHAT SINCE 12Z THIS
MORNING.

..DIAL.. 05/08/2009


ATTN...WFO...LMK...OHX...IND...PAH...MEG...LSX...LZK...SGF...

LAT...LON 36758821 37278769 37678790 37658854 37718935 38468929
38408703 36848681 35458747 35589121 36669179 36758821

[CrazyC83]

AccuWeather is calling this the "Inland Hurricane"...

I have NEVER seen anything like this! How long can this last?

[CrazyC83]

SEVERE THUNDERSTORM WARNING
ILC059-065-165-191-193-082000-
/O.NEW.KPAH.SV.W.0111.090508T1925Z-090508T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PADUCAH KY
225 PM CDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN PADUCAH HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
HAMILTON COUNTY IN SOUTH CENTRAL ILLINOIS...
WAYNE COUNTY IN SOUTH CENTRAL ILLINOIS...
WESTERN WHITE COUNTY IN SOUTHEAST ILLINOIS...
WESTERN GALLATIN COUNTY IN SOUTHERN ILLINOIS...
SALINE COUNTY IN SOUTHERN ILLINOIS...

* UNTIL 300 PM CDT.

* AT 225 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN
EXCESS OF 80 MPH. THIS STORM WAS LOCATED 7 MILES NORTH OF
GALATIA...MOVING EAST AT 40 MPH.

* LOCATIONS IN THE WARNED AREA INCLUDE...
MCLEANSBORO...
NORRIS CITY...
ENFIELD...
CARMI...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. SEEK SHELTER INDOORS. STAY TUNED TO
WEATHER RADIO OR LOCAL MEDIA FOR THE LATEST SEVERE WEATHER
INFORMATION.

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD VERY DAMAGING WINDS
AND WINDS OVER 80 MPH.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT FRIDAY AFTERNOON
FOR SOUTHEASTERN ILLINOIS AND SOUTHWEST INDIANA AND WESTERN KENTUCKY.

&&

LAT...LON 3861 8816 3769 8816 3769 8869 3861 8870
TIME...MOT...LOC 1925Z 253DEG 35KT 3794 8861

$$

[Ed Mahmoud]

I've heard the term "mesoscale convective vortex" used before for strong MCS's that eventually develop their own circulation.


Smaller scale, not sure how similar this is


The North Carolina "Tornadocane"

[CrazyC83]

Down to slight risk as the derecho is expected to weaken below "extreme" status (i.e. below 75 mph).

[CrazyC83]

SPC AC 082005

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0305 PM CDT FRI MAY 08 2009

VALID 082000Z - 091200Z

...THERE IS A SLGT RISK OF SVR TSTMS FROM SERN OK/NERN TX EWD ACROSS
THE MID MOS/TN VALLEYS AND INTO THE CAROLINAS...

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF IA/NWRN IL...

...TN VALLEY REGION...
WHILE EARLIER INTENSE MCS/BOW ECHO CONTINUES TO WEAKEN WITH
TIME...STRONG/SEVERE STORMS CONTINUE ACROSS S CENTRAL KY AND PARTS
OF MIDDLE TN -- WITH ISOLATED SUPERCELLS CONTINUING TO DEVELOP AHEAD
OF THE REMNANT BOW ECHO. WITH FAVORABLE SHEAR AND A VERY
MOIST/MODERATELY-UNSTABLE AIRMASS IN PLACE...EXPECT STORMS TO
CONTINUE MOVING EWD TOWARD THE APPALACHIANS THROUGH THE AFTERNOON.
WHILE THREAT SHOULD DIMINISH THIS EVENING...POTENTIAL FOR
STRONG/DAMAGING WINDS AND HAIL ALONG WITH ISOLATED TORNADOES WILL BE
POSSIBLE.

...NRN TX/SERN OK/AR...
AIRMASS REMAINS CAPPED ACROSS THIS REGION THIS AFTERNOON...BUT
SEWD-MOVING FRONT SHOULD PROVIDE AMPLE UVV TO ALLOW STORMS TO
DEVELOP NEAR -- OR MORE LIKELY TO THE COOL SIDE OF -- THE SURFACE
FRONT AS IT CONTINUES SEWD ACROSS OK/N TX THIS AFTERNOON AND
EVENING. WITH VERY STEEP LAPSE RATES/STRONG INSTABILITY ABOVE THE
CAPPING LAYER AND AMPLE SHEAR FOR SUPERCELLS...EXPECT VERY LARGE
HAIL ACROSS THIS REGION. LOCALLY-DAMAGING WINDS OR EVEN AN ISOLATED
TORNADO WILL ALSO BE POSSIBLE WITH ANY STORMS DEVELOPING NEAR THE
SURFACE FRONT. CONVECTION SHOULD CONTINUE WELL INTO THE OVERNIGHT
HOURS...AS MODEST SLY LOW-LEVEL JET CONTINUES TO PROVIDE FAVORABLE
WARM ADVECTION/ISENTROPIC LIFT FOR CONTINUED CONVECTIVE DEVELOPMENT.

...ERN CAROLINAS...
ISOLATED STORMS CONTINUE TO DEVELOP WITHIN MODERATELY-UNSTABLE
AIRMASS ACROSS THE ERN CAROLINAS. DEEP-LAYER WIND FIELD IS
RELATIVELY MODEST...BUT SHEAR APPEARS SUFFICIENT -- GIVEN THE DEGREE
OF INSTABILITY -- TO SUPPORT MULTICELL ORGANIZATION AND ASSOCIATED
HAIL/WIND POTENTIAL THROUGH EARLY EVENING BEFORE STORMS DIURNALLY
WEAKEN.

...IA/NRN IL AND VICINITY...
MID-LEVEL SHORT-WAVE TROUGH CONTINUES MOVING EWD ACROSS THE MO
VALLEY REGION...ALONG WITH THE ASSOCIATED SURFACE SYSTEM.
HOWEVER...DESTABILIZATION HAS BEEN LIMITED AHEAD OF THE FRONT...WITH
AOB 500 J/KG MIXED-LAYER CAPE EVIDENT ACROSS PARTS OF IA ATTM.
STORMS HAVE DEVELOPED OVER WRN/CENTRAL IA THIS AFTERNOON...AND GIVEN
FAVORABLE SHEAR IN PLACE EXPECT STRONG/LOCALLY-SEVERE STORMS TO
CONTINUE EWD TOWARD NRN IL. GIVEN LIMITED INSTABILITY
HOWEVER...STORM INTENSITY AND ASSOCIATED SEVERE POTENTIAL SHOULD
WANE WITH THE LOSS OF DAYTIME HEATING AS STORMS CROSS NRN IL AND
PERHAPS SRN WI.

..GOSS.. 05/08/2009

[Jeffweather]

Lexington here it comes!!!
http://www.wtvq.com/weather.html

[Dave]

Current conditions at my home:

Temp: 70F
Humidity: 99%
Dew Poing 65.0F
Winds: SE @ 4 mph
Pressure: 29.75"
Conditions: Light Rain

Air feels tropical as when we get the remanents of a tropical system over us. I know 'feels' is not a meterological term but that's the best description I can give.

[Dave]

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON KY
511 PM EDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN JACKSON KY
HAS ISSUED A

* TORNADO WARNING FOR...
SOUTHEASTERN WHITLEY COUNTY IN SOUTH CENTRAL KENTUCKY...
BELL COUNTY IN SOUTHEAST KENTUCKY...
SOUTH CENTRAL KNOX COUNTY IN SOUTHEAST KENTUCKY...

* UNTIL 600 PM EDT

* AT 508 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR GATLIFF...
OR 10 MILES SOUTHEAST OF WILLIAMSBURG...MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
PINEVILLE...
ARJAY...
BALKAN...
BINGHAMTOWN...
BIRDSEYE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLF
BALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS IN EXCESS OF 60
MPH.

[Dave]

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON KY
513 PM EDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN JACKSON KY
HAS ISSUED A

* TORNADO WARNING FOR...
NORTHERN ESTILL COUNTY IN EAST CENTRAL KENTUCKY...
POWELL COUNTY IN EAST CENTRAL KENTUCKY...

* UNTIL 545 PM EDT

* AT 509 PM EDT...THE PUBLIC REPORTED A FUNNEL CLOUD 10 MILES WEST
OF WINSTON...OR NEAR RICHMOND...MOVING NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
CLAY CITY...
STANTON...
BOWEN...
CALLOWAY CROSSING...
CAT CREEK.

[srainhoutx]

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PADUCAH KY
357 PM Cdt FRI MAY 08 2009

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0125 PM TSTM WND DMG CARBONDALE 37.72N 89.22W
05/08/2009 JACKSON IL EMERGENCY MNGR

MULTIPLE INJURIES. CARBONDALE VIRTUALLY IMPASSABLE DUE TO
DEBRIS. WIDESPREAD STRUCTURAL DAMAGE. NUMEROUS TREES AND
POWERLINES DOWN. ROOF COLLAPSE ON ONE SCHOOL.

[Dave]

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LOUISVILLE KY
512 PM EDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN LOUISVILLE HAS ISSUED A

* TORNADO WARNING FOR...
EASTERN MADISON COUNTY IN EAST CENTRAL KENTUCKY...

* UNTIL 530 PM EDT...

* AT 512 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR WACO...
MOVING EAST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COMBS
AND BYBEE

[Dave]

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSON KY
511 PM EDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN JACKSON KY
HAS ISSUED A

* TORNADO WARNING FOR...
SOUTHEASTERN WHITLEY COUNTY IN SOUTH CENTRAL KENTUCKY...
BELL COUNTY IN SOUTHEAST KENTUCKY...
SOUTH CENTRAL KNOX COUNTY IN SOUTHEAST KENTUCKY...

* UNTIL 600 PM EDT

* AT 508 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR GATLIFF...
OR 10 MILES SOUTHEAST OF WILLIAMSBURG...MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
PINEVILLE...
ARJAY...
BALKAN...
BINGHAMTOWN...
BIRDSEYE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLF
BALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS IN EXCESS OF 60
MPH.

[Dave]

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
515 PM EDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* TORNADO WARNING FOR...
EXTREME NORTHERN MORGAN COUNTY IN EAST TENNESSEE...
SCOTT COUNTY IN EAST TENNESSEE...
THIS INCLUDES THE CITY OF ONEIDA...

* UNTIL 615 PM EDT

* AT 413 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 24 MILES WEST OF
ONEIDA...OR NEAR JAMESTOWN...MOVING EAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
HUNTSVILLE AND ONEIDA BY 550 PM EDT...

THIS IS AN EXTREMELY DANGEROUS STORM! TAKE COVER IMMEDIATELY!!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING
GOLFBALL SIZE HAIL AND DESTRUCTIVE OUTFLOW WINDS IN EXCESS OF 50 MPH.

[Dave]

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MORRISTOWN TN
458 PM EDT FRI MAY 8 2009

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A

* TORNADO WARNING FOR...
WESTERN BLOUNT COUNTY IN EAST TENNESSEE...
MCMINN COUNTY IN EAST TENNESSEE...
THIS INCLUDES THE CITY OF ATHENS...
MONROE COUNTY IN EAST TENNESSEE...
THIS INCLUDES THE CITY OF MADISONVILLE...

* UNTIL 600 PM EDT

* AT 457 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR ETOWAH...OR
6 MILES SOUTHEAST OF ATHENS...MOVING EAST AT 20 MPH.

* THE TORNADO WILL BE NEAR...
6 MILES SOUTH OF MADISONVILLE BY 535 PM EDT...