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Latest Wire Post: Track Hurricane Earl, now a Category 4 storm
GIS Data last updated Fri, 03 Sep 2010 02:53:04 GMT
SPC Reports
Outlooks: Atlantic | Pacific
Severe Weather Warnings, Watches & Advisories:
NWS Severe Warnings/Watches MapStorm Reports Maps
Storm Prediction Center Watches:
SPC Severe Thunderstorm Watch 643
WW 643 SEVERE TSTM IL MO 022145Z - 030500Z
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 643
NWS STORM PREDICTION CENTER NORMAN OK
445 PM CDT THU SEP 2 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND SOUTHERN ILLINOIS
CENTRAL AND SOUTHERN MISSOURI
EFFECTIVE THIS THURSDAY AFTERNOON FROM 445 PM UNTIL MIDNIGHT CDT.
HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHWEST
OF MONETT MISSOURI TO 25 MILES SOUTH OF DANVILLE ILLINOIS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 642...
DISCUSSION...THUNDERSTORMS ARE SLOWLY INCREASING IN COVERAGE AND
INTENSITY ALONG/AHEAD OF A COLD FRONT MOVING SEWD INTO LOWER MO AND
MIDDLE MS VALLEYS. PRE-FRONTAL AIR MASS IS WARM WITH SURFACE
TEMPERATURES IN THE MID/UPPER 80S...AND DEW POINTS IN THE LOW 70S
ARE CONTRIBUTING TO MLCAPE OF 1500-2500 J/KG. WINDS ALOFT AND DEEP
LAYER SHEAR IS EXPECTED TO INCREASE /ESPECIALLY OVER CNTRL PART SOF
MO AND IL/ AS UPSTREAM UPPER TROUGH MOVES TOWARD THE MS VALLEY
TONIGHT. DAMAGING WIND GUSTS AND HAIL WILL BE THE PRIMARY SEVERE
THREATS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 26025.
...WEISS
Read more
SPC Severe Thunderstorm Watch 642
WW 642 SEVERE TSTM KS OK TX 022030Z - 030300Z
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 642
NWS STORM PREDICTION CENTER NORMAN OK
330 PM CDT THU SEP 2 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
LARGE PART OF SOUTHEAST KANSAS
LARGE PART OF NORTHERN AND WESTERN OKLAHOMA
PARTS OF NORTHWEST TEXAS
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 330 PM UNTIL
1000 PM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH
SOUTHWEST OF CHILDRESS TEXAS TO 45 MILES EAST NORTHEAST OF
CHANUTE KANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
DISCUSSION...STRONG COLD FRONT WILL INITIATE THUNDERSTORMS AS IT
ENCOUNTERS AN INCREASINGLY UNSTABLE AND WEAKLY CAPPED AIR MASS.
WITH DCAPES TO 1500 J/KG AND MLCAPES AOA 2000 J/KG...DAMAGING WINDS
WILL BECOME INCREASING THREAT AS STORMS DEVELOP ALONG AND FRONT AS
IT CONTINUES SWD THRU THE WATCH.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 30020.
...HALES
Read more
SPC Severe Thunderstorm Watch 643 Status Reports
WW 0643 Status Reports
STATUS REPORT ON WW 643 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NNW JLN TO 10 NW ALN TO 35 WSW SPI TO 25 ESE UIN. ..GOSS..09/03/10 ATTN...WFO...LSX...ILX...LOT...SGF...EAX... STATUS REPORT FOR WS 643 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS ILC005-017-019-021-023-025-027-029-033-035-039-041-045-049-051- 053-075-079-101-105-107-113-115-117-119-121-125-129-133-135-137- 139-147-157-159-163-167-171-173-179-183-189-030240- IL . ILLINOIS COUNTIES INCLUDED ARE BOND CASS CHAMPAIGN CHRISTIAN CLARK CLAY CLINTON COLES CRAWFORD CUMBERLAND DE WITT DOUGLAS EDGAR EFFINGHAM FAYETTE FORD IROQUOIS JASPER LAWRENCE LIVINGSTON LOGAN MCLEAN MACON MACOUPIN MADISON MARION MASON MENARD MONROE MONTGOMERY MORGAN MOULTRIE PIATT RANDOLPH RICHLAND ST. CLAIR SANGAMON SCOTT SHELBY TAZEWELL VERMILION WASHINGTON MOC009-011-029-039-043-055-057-059-065-067-071-073-077-085-093- 097-099-105-109-119-123-125-131-145-151-153-161-167-169-179-183-Read more
SPC Severe Thunderstorm Watch 642 Status Reports
WW 0642 Status Reports
STATUS REPORT ON WW 642 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 SSW CDS TO 15 ESE LTS TO 25 ESE CHK. ..STOPPKOTTE..09/03/10 ATTN...WFO...ICT...TOP...SGF...EAX...OUN...TSA...LUB...AMA... STATUS REPORT FOR WS 642 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS ARC007-015-087-143-030240- AR . ARKANSAS COUNTIES INCLUDED ARE BENTON CARROLL MADISON WASHINGTON OKC001-019-021-031-033-041-049-063-067-099-101-107-111-123-133- 137-141-145-030240- OK . OKLAHOMA COUNTIES INCLUDED ARE ADAIR CARTER CHEROKEE COMANCHE COTTON DELAWARE GARVIN HUGHES JEFFERSON MURRAY MUSKOGEE OKFUSKEE OKMULGEE PONTOTOC SEMINOLE STEPHENS TILLMAN WAGONER TXC009-023-077-155-269-275-485-487-030240-Read more
SPC MD 1788
MD 1788 CONCERNING SEVERE THUNDERSTORM WATCH 642... FOR WRN N TX...SWRN OK INTO E CNTRL OK
MESOSCALE DISCUSSION 1788
NWS STORM PREDICTION CENTER NORMAN OK
0918 PM CDT THU SEP 02 2010
AREAS AFFECTED...WRN N TX...SWRN OK INTO E CNTRL OK
CONCERNING...SEVERE THUNDERSTORM WATCH 642...
VALID 030218Z - 030345Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 642
CONTINUES.
SEVERE THREAT WILL CONTINUE TO DIMINISH AS STORMS TRACK SEWD THIS
EVENING. A NEW WW IS NOT ANTICIPATED.
SFC OBSERVATIONS THE LAST HOUR HAVE LARGELY SHOWED A DECREASE IN
WIND GUSTS FROM WRN N TX INTO SWRN OK TO E CNTRL OK...ALTHOUGH
STORMS COULD STILL REMAIN SEVERE FOR ANOTHER HOUR OR SO. AS STORMS
CONTINUE TO TRACK SEWD...AIR MASS WILL BECOME LESS UNSTABLE AND
STORMS WILL BECOME MORE ELEVATED...EFFECTIVELY ENDING DAMAGING WIND
THREAT. HEAVY RAINFALL AND GUSTY WINDS WITH SMALL HAIL WILL STILL BE
POSSIBLE BUT SEVERE THREAT SHOULD LARGELY BE OVER BY THE WATCH
EXPIRATION TIME.
..STOPPKOTTE.. 09/03/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SGF...TSA...FWD...OUN...SJT...LUB...AMA...
LAT...LON 34710037 34220086 33610098 33120067 32960035 33079930
33819731 35279508 35719445 36279430 36539454 36679510
34710037
Read more
SPC Sep 3, 2010 0100 UTC Day 1 Convective Outlook
SPC 0100Z Day 1 Outlook

DAY 1 CONVECTIVE OUTLOOK NWS STORM PREDICTION CENTER NORMAN OK 0756 PM CDT THU SEP 02 2010 VALID 030100Z - 031200Z ...THERE IS A SLGT RISK OF SVR TSTMS PORTIONS SRN PLAINS TO UPPER GREAT LAKES... ...SYNOPSIS... PROGRESSIVE NRN-STREAM PATTERN WILL REMAIN DOMINATED BY RIDGING ALOFT OVER PAC NW...SHIFTING EWD TOWARD NRN ROCKIES...AND STG SHORTWAVE TROUGH NOW EVIDENT IN MOISTURE CHANNEL IMAGERY FROM MN ACROSS NWRN IA TO S-CENTRAL NEB. THIS TROUGH IS FCST TO MOVE EWD AND DEEPEN...DEVELOPING CLOSED 500 MB CIRCULATION OVER LS BY 12Z...WHILE SRN PORTION REACHES MID MS VALLEY. ASSOCIATED/STG SFC COLD FRONT WAS ANALYZED AT 23Z FROM SFC LOW NEAR GRB...SWWD ACROSS NWRN/EXTREME W-CENTRAL IL...SWRN MO...CENTRAL OK...TX SOUTH-PLAINS REGION NEAR LBB...TO SERN NM. FRONT IS EXPECTED TO SURGE SWD ACROSS SRN HIGH PLAINS AND SEWD OVER OK/MO/IL. BY END OF PERIOD...FRONT SHOULD EXTEND FROM NWRN OH SWWD ACROSS PORTIONS WRN/CENTRAL KY...EXTREME WRN TN...SRN AR...CENTRAL TX...NRN CHIHUAHUA. ...SRN PLAINS TO UPPER GREAT LAKES... SCATTERED TSTMS -- MOSTLY IN LINES AND MULTICELLULAR SEGMENTS...WITH SOME DISCRETE CELLS -- CONTINUE ON BOTH SIDES OF COLD FRONT BETWEEN WI/IL AND TX HIGH PLAINS. SVR GUSTS HAVE BEEN MEASURED AT A FEW OBS SITES AND MESONET STATIONS MAINLY IN SRN PORTIONS OUTLOOK AREA. REF SPC WWS 642-643 AND ATTENDANT MESOSCALE DISCUSSIONS FOR DETAILS ON NEAR-TERM SVR POTENTIAL. GREATEST REMAINING THREAT FOR DAMAGING GUSTS AND ISOLATED HAIL WILL BE WITH ACTIVITY ALONG/AHEAD OF SFC COLD FRONT. ALTHOUGH MAIN THREAT IS DAMAGING WIND...SVR HAIL POTENTIAL STILL MAY EXIST WITH RELATIVELY DISCRETE TSTMS...ESPECIALLY FROM OZARKS NEWD WHERE VERTICAL SHEAR WILL SUPPORT MORE ORGANIZED UPDRAFTS. ACTIVITY OVER SRN PLAINS INTO OZARKS WILL BE AIDED BY DEEP/WELL-MIXED BOUNDARY LAYERS FOR ANOTHER COUPLE OF HOURS...BEFORE DIABATIC COOLING BEGINS TO STABILIZE BOUNDARY LAYER. FARTHER NE...STRONGER DEEP-LAYER SHEAR IS EVIDENT...BUT WITH WEAKER LAPSE RATES ALOFT AND IN BOUNDARY LAYER. IN BOTH CASES MAIN THREAT IS DAMAGING WIND...WITH SOMEWHAT LONGER-LIVED THREAT OVER SRN PLAINS GIVEN DRIER AND MORE UNSTABLE BOUNDARY LAYER INTO WHICH ORGANIZED OUTFLOW REGIME WILL BE MOVING. SVR THREAT SHOULD DIMINISH APPRECIABLY AFTER ABOUT 05Z THROUGHOUT OUTLOOK AREA. ..EDWARDS.. 09/03/2010Read more
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