000
FXUS64 KHGX 010142
AFDHGX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
842 PM CDT FRI AUG 31 2007
.DISCUSSION...
CLUSTER OF THUNDERSTORMS FROM DOWNTOWN HOUSTON ESE TO THE BOLIVAR
PENINSULA HOLDING TOGETHER AFTER SUNSET WHILE MOVING SOUTHWEST
NEAR 20 MPH. SOUNDINGS SHOW OVER 2 INCHES PW AND NO CAP SO MESO
BOUNDARY INTERACTIONS SUFFICIENT TO MAINTAIN SOME CONVECTION AFTER
DARK. NORTH OF I10 MOST ACTIVITY GONE FOR TONIGHT. WILL ADJUST
POPS SLIGHTY HIGHER COASTAL COUNTIES TIL AFTER MIDNIGHT AND LOWER
POPS NORTHERN HALF. OTHERWISE CURRENT FORECAST WORKING OUT WELL. 30
&&
.PREV DISCUSSION... /ISSUED 259 PM CDT FRI AUG 31 2007/
DISCUSSION...
THERE IS A LITTLE MORE THUNDERSTORM ACTIVITY ONGOING COMPARED TO
YESTERDAY. MOST OF THE ACTIVITY IS MOVING TO THE SW WITH MAINLY
NE TO N FLOW ALOFT PER VAD WINDS AND WIND PROFILERS IN THE AREA.
ONE CLUSTER CONTINUES TO HOLD TOGETHER OVER HOUSTON/TRINITY
COUNTIES WHICH WILL PROBABLY AFFECT THE HUNTSVILLE TO COLLEGE
STATION AREA OVER THE NEXT COUPLE OF HOURS IF IT HOLDS TOGETHER.
THE OTHER AREA OF STORMS TO WATCH IS OVER THE COASTAL PLAIN
TOWARDS MATAGORDA BAY. THUNDERSTORMS ARE MOVING SO FLOODING HAS
NOT BEEN MUCH OF AN ISSUE EVEN WITH SOME RAINRATES AROUND AN INCH
AN HOUR. AGAIN EXPECT THIS ACTIVITY TO DIE OFF TOWARDS SUNSET.
A WEAK DIFFUSE FRONTAL BOUNDARY MAY HANG ACROSS THE AREA BUT IT
WILL QUICKLY DISSIPATE. DRIER AIR LOCATED OVER ARKANSAS IS STILL
FORECAST TO SHIFT INTO SE TX MAINLY OVER THE PINY WOODS OVER TO
THE BRAZOS VALLEY. DOUBT IT WILL MAKE IF AS FAR SOUTH AS I-10 SO
WILL STILL CARRY SOME CHANCE THUNDERSTORM POPS OVER THE WEEKEND.
THE 12Z NAM/GFS SOLUTIONS SEEM TOO MOIST GIVEN NE TO E 850MB FLOW
EXPECTED TO PERSIST TOMORROW. CURRENT WATER VAPOR IMAGERY DOES
PICK UP A DEVELOP UPPER LOW OVER W CENTRAL TX AND THIS WILL LIKELY
BECOME A PLAYER IN THE WEATHER EARLY NEXT WEEK BUT SHOULD NOT BE
MUCH OF A INFLUENCE FOR THE WEEKEND.
BETTER MOISTURE IS EXPECTED TO RETURN TO SE TX MAINLY SUN THROUGH
TUE NEXT WEEK WHICH BRING BACK DECENT POPS AS WELL. THE FORECAST
WILL UNDERCUT GUIDANCE A BIT BUT KEEPS SOME HIGHER POPS OFF
TOWARDS MATAGORDA BAY WHERE MOISTURE WILL BE BETTER. A DIGGING
TROUGH OVER THE ROCKIE MOUNTAINS EVENTUALLY PICKS UP THE UPPER
LOW INTO THE WESTERLIES WED INTO THU SO MAY SEE POPS TAPER OFF A
BIT TOWARDS THE END OF THE WEEK. THE EXTENDED RANGE IS NOT AS
OPTIMISTIC WITH THE COLD FRONT AS PREVIOUS FORECASTS. THE PATTERN
IS LESS AMPLIFIED THAN BEFORE WHICH WOULD LEND TO THE FRONT
STALLING. AN UPPER LEVEL RIDGE ALSO REMAINS QUIT STRONG OVER THE
W ATL AND E GULF LATE NEXT WEEK WHICH WILL BE DIFFICULT TO BREAK
DOWN. FOR NOW THE FORECAST WILL CONTINUE WITH PREVIOUS TRENDS OF
MAINLY AFTERNOON THUNDERSTORM ACTIVITY WITH THE TYPICAL GULF
MOISTURE IN PLACE.
39
MARINE...
THE LIGHT PRESSURE GRADIENT WILL PERSIST FOR THE NEXT SEVERAL DAYS
RESULTING IN PERIODS OF VARIABLE WINDS AT 5 TO 10 KNOTS. A LIGHT
NORTH WIND MIGHT STILL END UP BEING THE PRIMARY DIRECTION OBSERVED
UNDER THIS REGIME. AN ONSHORE FLOW IS STILL ANTICIPATED TO RETURN TO
THE AREA ON TUESDAY AND STRENGTHEN BY WEDNESDAY IN RESPONSE TO
LOWERING PRESSURES TO THE LEE OF THE ROCKIES. 1 TO 2 FOOT SEAS ALL
THE WAY THROUGH TUESDAY WILL BEGIN TO RISE TUESDAY NIGHT AND
WEDNESDAY. CAUTION FLAGS MIGHT BE NEEDED AROUND MIDWEEK NEXT WEEK. 42
AVIATION...
AFTERNOON CONVECTION WILL COME TO AN END THIS EVENING. WE COULD SEE
SOME DEVELOPMENT AGAIN OVERNIGHT...BUT CONFIDENCE IS LOW ON WHEN
THIS WILL HAPPEN OR WHERE IT MAY OCCUR. WITH DEEPEST MOISTURE LEVELS
NEAR THE COAST...HAVE STUCK A VCSH IN ONLY THE KGLS TAF. HAVE ALSO
MENTIONED SOME OVERNIGHT PATCHY LIGHT FOG AT A COUPLE OF OUR INLAND
TAF SITES NORMALLY PRONE TO FOG FORMATION. HAVE GENERALLY GONE WITH
VFR CONDITIONS FOR BOTH TONIGHT AND TOMORROW MORNING. 42
&&
.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL) 73 93 71 92 72 / 10 20 10 30 20
HOUSTON (IAH) 73 92 73 91 73 / 20 40 20 40 30
GALVESTON (GLS) 78 89 79 89 77 / 50 40 20 40 20
&&
.HGX WATCHES/WARNINGS/ADVISORIES...
TX...NONE.
GM...NONE.
&&
$$
DISCUSSION...30
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