Tropical Storm Hermine Heavy Rain/Severe Threat

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svrwx0503
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Since this is more concerned with local impacts of the tropical storm thought it best to start a separate thread instead of combine with the more broad hurricane central one. Srain, feel free to delete or move this topic to wherever you think is best. :)

The latest radar imagery across the state this morning continue to show the center of Hermine moving almost due north up US 281 with the center passing over Alice at this time. Very deep tropical moisture continues to spread into southeast Texas with PW's expected to continue to rise through the day.

Moderate to heavy shower and thunderstorms are currently moving across our southwestern counties and what is concerning is that with the northward movement of Hermine, we will likely see those heavy rain bands lift north up the coast towards the metro area through mid-morning. SPC does have the region in a slight risk for severe weather with isolated tornadoes the main threat.

The latest mesoanalysis this morning does indicate strong low level helicity values, especially across our southwest counties and these higher values may try and work there way north and northeast through the morning as the center of Hermine lifts north.

It is looking like the flooding threat will start to increase pretty quickly as we head towards mid-morning and we may see additional local development as daytime heating kicks in and also acts to expand the core rain area of Hermine. All in all, be careful out there everyone!
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svrwx0503
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HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
635 AM CDT TUE SEP 7 2010

GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226-
227-235>238-081145-
AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND-
GALVESTON-GALVESTON BAY-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY-
MADISON-MATAGORDA-MATAGORDA BAY-MONTGOMERY-POLK-SAN JACINTO-
TRINITY-WALKER-WALLER-WASHINGTON-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM-
WATERS FROM HIGH ISLAND TO FREEPORT 20 TO 60 NM-
WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM-WHARTON-
635 AM CDT TUE SEP 7 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

TROPICAL STORM HERMINE WILL CONTINUE TO MOVE ACROSS SOUTH TEXAS
TODAY. THE TRACK OF THIS SYSTEM WILL HELP TO DRAW VERY DEEP
TROPICAL MOISTURE OVER SOUTHEAST TEXAS TODAY AND TONIGHT. LOCALLY
HEAVY RAINFALL IS POSSIBLE AND A FLOOD WATCH HAS BEEN POSTED
THROUGH WEDNESDAY MORNING FOR AREAS GENERALLY WEST OF A FREEPORT
TO COLUMBUS LINE. THIS MAY EVENTUALLY NEED TO BE EXPANDED FURTHER
NORTH AND EAST. IN ADDITION TO THE THREAT OF HEAVY RAINS...THESE
STORMS COULD ALSO PRODUCE ISOLATED TORNADOES. THE FORECASTED TRACK
OF HERMINE ALONG WITH HEATING COULD EXPAND THIS THREAT OF ISOLATED
TORNADOES FURTHER NORTH AND EAST THIS AFTERNOON AND EVENING.


.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY OR TONIGHT.
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srainhoutx
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We will leave this just as you posted Matt. I'll add a radar view. Feel free to add more. :)

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srainhoutx
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Don't like seeing those training storms to our SW. It certainly appears to be shifting slowing E as Hermine slowly begins to spin down.
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Here is the Tornado Watch information...

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 646
NWS STORM PREDICTION CENTER NORMAN OK
440 AM CDT TUE SEP 7 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

SOUTHEAST TEXAS
COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 440 AM UNTIL
100 PM CDT.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES EITHER SIDE OF A LINE FROM 25 MILES WEST OF CORPUS CHRISTI
TEXAS TO 45 MILES NORTH NORTHWEST OF ANGLETON TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 645. WATCH NUMBER 645 WILL NOT BE IN EFFECT AFTER
440 AM CDT.

DISCUSSION...PER LATEST NHC GUIDANCE...TROPICAL STORM HERMINE WILL
CONTINUE TO TRACK NNWWD TODAY WITH A STRONGLY SHEARED AND VERY MOIST
LOW-LEVEL ENVIRONMENT BEING MAINTAINED WITHIN THE RIGHT SEMICIRCLE
OF THE CYCLONE /RELATIVE TO ITS MOTION/. PRIOR TO SUNRISE...THE
PRIMARY SUPERCELL/TORNADO THREAT WILL REMAIN INVOF THE COASTAL AREAS
WHERE ENVIRONMENT REMAINS SUFFICIENTLY WARM/MOIST TO SUPPORT
VIGOROUS CONVECTION. HOWEVER...WITH THE ONSET OF DIABATIC HEATING
LATER THIS MORNING...EXPECT THE POTENTIAL FOR TORNADOES TO GRADUALLY
DEVELOP FARTHER INLAND.
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SPC:

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0728 AM CDT TUE SEP 07 2010

VALID 071300Z - 081200Z

...THERE IS A SLGT RISK OF SVR TSTMS OVER SERN TX...

...TX...

PER LATEST NHC GUIDANCE...TROPICAL STORM HERMINE IS FORECAST TO
CONTINUE NNWWD TODAY INTO THE EDWARDS PLATEAU REGION PRIOR TO
WEAKENING TO A DEPRESSION WHILE PROGRESSING NWD THROUGH W-CNTRL TX
TONIGHT. AS OF 12Z...THIS TROPICAL SYSTEM CONTAINS MULTIPLE BANDS
OF TSTMS WITHIN IT/S RIGHT SEMICIRCLE /RELATIVE TO CYCLONE MOTION/
FROM W OF CLL SSWWD INTO THE GULF OF MEXICO...E OF BRO AND CRP.
THESE TSTMS ARE ROOTED WITHIN A MOIST BOUNDARY LAYER WITH DEW POINTS
IN THE MID/UPPER 70S AND A BROAD ENVELOPE OF MODERATE TO STRONG
LOW-LEVEL SHEAR /I.E. 150 TO LOCALLY 400+ M2 PER S2/.

RADAR AND EARLY VISIBLE SATELLITE DATA CONFIRM THAT CLOUDS AND
PRECIPITATION WILL BE WIDESPREAD. HOWEVER...WHERE LOCAL POCKETS OF
STRONGER HEATING CAN OCCUR...THE VERY MOIST ENVIRONMENT WILL BOOST
AFTERNOON MLCAPE TO 1000-2000 J/KG. GIVEN THE STRONG LOW-LEVEL WIND
FIELD ALREADY IN PLACE...EXPECT AN ENVIRONMENT SUPPORTIVE OF
SUPERCELLS CAPABLE OF TORNADOES TO GRADUALLY EXPAND INLAND THROUGH
THE DIURNAL HEATING CYCLE.
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ticka1
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I posted this on the Hermine hurricane thread - moving it over here.

Looks like most of the rain is on the west side. Will the rain move more east today? If its moving NNW - I don't think it will.
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From Nesdis...

SATELLITE PRECIPITATION ESTIMATES..DATE/TIME 09/07/10 1134Z
SATELLITE ANALYSIS BRANCH/NESDIS---NPPU---TEL.301-763-8678
LATEST DATA USED: GOES-12: 1115Z DS
.
LOCATION...S/SE/CENTRAL TEXAS...
.
ATTN WFOS...HGX...FWD...CRP...EWX...BRO...SJT...
ATTN RFCS...WGRFC...
.
EVENT...HVY RAINS ASSCD WITH T.S. HERMINE
.
SATELLITE ANALYSIS AND TRENDS...CENTER OF T.S. HERMINE CAN BE SEEN VERY
CLEARLY IN RADAR IMAGERY OVER THE KLEBERG/JIM WELLS COUNTY BORDER AND
RECENTLY HAS STARTED TO TAKE ON A SLIGHTLY MORE NWRLY TRACK THAN THE NR
DUE N TRACK IT HAS BEEN ON MOST OF THE NIGHT. RICH MOISTURE CONTINUES
TO BE PUMPED NWWD FROM THE WRN GOM AND INTO THE SE TX COAST/S CENTRAL
REGION OF TX. AS HERMINE BEGINS TO TAKE ON MORE OF A NWRLY MOVEMENT PER
THE NHC FCST TRACK..THIS SHOULD ALLOW FOR ADDTL PRECIP TO LIFT NW TWDS
CENTRAL TX. NUMEROUS OVERSHOOTING TOPS HAVE BEEN NOTICEABLE IN THE VERY
COLD CNVTN OF THE OUTER BAND OF THIS STORM DURING THE LAST 2-3 HRS WITH
A FEW OCCASIONS WHERE CLOUD TOP TEMPS BREACHED THE -80C BARRIER.
.
GIVEN THE CENTER IS BEGINNING TO MOVE INLAND IT HAS APPEARED RECENTLY
THAT THE OUTER BAND HAS BEEN THE MAIN PRECIP PRODUCER..PROVIDING
COVERAGE OF MOD-HVY RAINFALL OVER A WIDE AREA OF THE TX COAST. ANOTHER
SMALL BAND IS BEGINNING TO SET UP THOUGH..JUST WITHIN THE LAST HR OR
SO..STRETCHING SSEWD FROM REFUGIO COUNTY. TORRENTIAL RAINFALL RATES
OF 2-3"/HR ARE LIKELY TO BE OCCURRING BENEATH THIS INNER BAND WHILE IN
GNRL ESTIMATED RATES OF 1-2"/HR ARE OCCURRING IN THE OUTER BAND(S) AS
CELLS COME ONSHORE. RATES ARE LIKELY LESSER INLAND BUT THE STRONG INFLOW
BEING WRAPPED INTO THE STATE WITH VWP'S INDICATING 30-40KTS OF 85H FLOW
WILL KEEP PUSHING MOISTURE/PRECIP FURTHER INLAND THROUGHOUT THE EARLY
MORNING. 6 HR SATL ESTIMATES ENDING 11Z HAVE GIVEN MAX AMOUNTS OF 5.2"
JUST OFF THE COAST OF REFUGIO COUNTY WITH A NR 5" ESTIMATE OVER PART OF
CAMERON COUNTY AND 4.5" OF SE CALHOUN COUNTY.
.
PLEASE SEE WEB ADDRESS BELOW FOR ESTIMATE GRAPHIC AND GRAPHIC ANALYSIS.
.
SHORT TERM OUTLOOK VALID 1130-1430Z..HIGH CONFIDENCE IN SHORT TERM
OUTLOOK..SLIGHT SHIFT IN TRACK NOW OF THE CENTER APPEARS TO BE GOING A
BIT MORE NW NOW PULLING RICH MOISTURE INTO CENTRAL TX WITH IT. HIGHEST
CHC FOR HVY RAINFALL THREAT IN SHORT TERM REMAINS NR THE COAST THOUGH
WHERE HVY RAINS HAVE ALREADY OCCURRED AND RATES WILL BE HIGHEST.
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Hermine has provided light to moderate rain here in Austin since about 7 am. What concerns me is we're already having some ponding issues on roadways and we have a lot more rain to go ... I'm sure we're going to see flooding and flash flooding issues in and around Austin and the Hill Country. :(
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1.16 inches of rain as of 9:30A in east Round Rock, coming down pretty good.
Put the wet stuff on the red stuff!
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BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
928 AM CDT TUE SEP 7 2010

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* TORNADO WARNING FOR...
NORTHERN FORT BEND COUNTY IN SOUTHEAST TEXAS...
SOUTHERN WALLER COUNTY IN SOUTHEAST TEXAS...

* UNTIL 1000 AM CDT

* AT 925 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO THIS TORNADO
WAS LOCATED NEAR FULSHEAR... MOVING NORTHWEST AT 35 MPH.

* LOCATIONS IN THE TORNADO WARNING INCLUDE BUT ARE NOT LIMITED TO
MONAVILLE...PRAIRIE VIEW...PINE ISLAND...PATTISON AND BROOKSHIRE.
Carla/Alicia/Jerry(In The Eye)/Michelle/Charley/Ivan/Dennis/Katrina/Rita/Wilma/Humberto/Ike/Harvey

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BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
855 AM CDT TUE SEP 7 2010

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
COLORADO COUNTY IN SOUTHEAST TEXAS...
JACKSON COUNTY IN SOUTHEAST TEXAS...
MATAGORDA COUNTY IN SOUTHEAST TEXAS...
WHARTON COUNTY IN SOUTHEAST TEXAS...

* UNTIL NOON CDT

* AT 852 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT FLASH FLOODING WAS LIKELY FROM WIDESPREAD MODERATE RAIN AND
EMBEDDED THUNDERSTORMS. THE EMBEDDED STORMS WILL PRODUCE LOCALLY
HEAVY RAIN WHICH WILL LIKELY CAUSE FLASH FLOODING IN THE WARNING
AREA. 3 TO 4 INCHES OF RAIN HAS ALREADY FALLEN OVER PARTS OF JACKSON
AND MATAGORDA COUNTIES AND 1 TO 3 INCHES OF RAIN HAS FALLEN OVER
PARTS OF COLORADO AND WHARTON COUNTIES. AN ADDITIONAL 2 TO 3 INCHES
OF RAIN IS EXPECTED THIS MORNING OVER PARTS OF THE WARNING AREA.

* LOCATIONS IN THE FLOOD WARNING INCLUDE BUT ARE NOT LIMITED TO
WADSWORTH...VANDERBILT...SOUTH TEXAS NUCLEAR PLANT...SHERIDAN...
SARGENT...ROCK ISLAND...PIERCE...NADA...MORALES...MIDFIELD...
MATAGORDA...LOUISE...LAKE TEXANA DAM...HUNGERFORD...GARWOOD...
FRELSBURG...EGYPT...DANEVANG...CORDELE...BLESSING...WHARTON...
WEIMAR...VAN VLECK...PALACIOS...MARKHAM...LA WARD...GANADO...EL
CAMPO...EDNA...EAGLE LAKE...COLUMBUS AND BOLING-IAGO.

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Andrew
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One thing concerning to me is the lack of west movement. Right now the movement is north and a quicker east movement could occur. That means that tonight into tomm when the system moves to the north of us we could get some steady training.
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Rip76
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Click on Trop. points...
just a little East of the forcasted track, not too bad.

http://www.ssd.noaa.gov/goes/east/gmex/flash-vis.html
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I was telling a few folks this last night ... these tropical systems almost NEVER behave as progged once they make landfall. There always seems to be a few surprises with the track. And here we are with HERMINE, who is definitely moving more northeast than predicted.

I'll tell you what ... with this current movement, someone along I-35 is going to get a core rain event tonight and it is not going to be pretty.
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Andrew wrote:One thing concerning to me is the lack of west movement. Right now the movement is north and a quicker east movement could occur. That means that tonight into tomm when the system moves to the north of us we could get some steady training.
I just touched on this in the Hermine thread.

Careful what we wish for. :P
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This storm is either moving ne or nne now. That is what radar shows, anyway.
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Portastorm wrote:I was telling a few folks this last night ... these tropical systems almost NEVER behave as progged once they make landfall. There always seems to be a few surprises with the track. And here we are with HERMINE, who is definitely moving more northeast than predicted.

I'll tell you what ... with this current movement, someone along I-35 is going to get a core rain event tonight and it is not going to be pretty.
It might be moving fast enough to limit a true core rain event Porta. However the circulation is still so strong that there will be some impressive training events with what are still true feeder bands still occurring .

Usedtobe over on Eastern posted something on rain core events yesterday. I'll try and dig it up here in a few.
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Portastorm
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Hope you are right about that Scott. One other thing ... I'm hard pressed to be believe that the center of this storm will be in Kerr County this evening as currently progged by NHC. Not with this current movement.
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HGX is expanding the Flood Watch...

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1001 AM CDT TUE SEP 7 2010

.DISCUSSION...
WELL A GLANCE AT THE RADAR TELLS THE STORY TODAY. WIDESPREAD HVY
PRECIP IN BANDS ASSOCIATED WITH HERMINE AFFECTING AREAS ALONG AND
SW OF A GALVESTON TO HOUSTON TO BRENHAM LINE. TRAINING CELLS WILL
PRODUCE SOME FLOODING PROBLEMS TODAY AS RAINFALL TOTALS ADD UP.
PORTIONS OF JACKSON COUNTY HAVE SEEN 5 INCHES OF RAIN SINCE
MIDNIGHT. HERMINE IS TRACKING A LITTLE FURTHER EAST THAN
ANTICIPATED YESTERDAY AND SO WILL BE EXPANDING THE FLOOD WATCH
NORTHWARD TO INCLUDE A FEW MORE COUNTIES WITH THE UPDATE THIS
MORNING AS HERMINE MOVES NORTH. HAVE ALSO ADJUSTED THE POPS TO GO
HIGHER IN MOST AREAS AND A LITTLE LOWER ACROSS THE EXT E/NE.

WE DO HAVE A TORNADO WATCH UNTIL 1 PM FOR THE SW HALF AND HAVE
SEEN A COUPLE OF CELLS ROTATING THIS MORNING. EXPECT THE TORNADO
THREAT TO CONTINUE THROUGH THE AFT HOURS.

STILL MONITORING TIDE LEVELS. ATTM WATER LEVELS ARE ABOUT 1.5 TO
2.0 FEET ABOVE NORMAL WHICH WOULD MEAN EXPECTED WATER LEVELS FOR
BEACH FRONT AREAS WILL BE NEAR 4 FEET AT HIGH TIDE AT MID AFTERNOON.
IF DEPARTURES FROM NORMAL GO UP MUCH IN THE NEXT FEW HOURS WE WILL
HAVE TO REISSUE THE COASTAL FLOOD ADVISORY FOR BEACH FRONT AREAS OF
BRAZORIA AND GALVESTON. 33
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