Category Archives: Severe Thunderstorm Watch

Severe Thunderstorm Watch (Iowa, Minnesota, Wisconsin)

ww0466_radar_big

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 466
NWS STORM PREDICTION CENTER NORMAN OK
745 PM CDT MON AUG 18 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN AND EASTERN IOWA
SOUTHEASTERN MINNESOTA
WESTERN AND SOUTHERN WISCONSIN

* EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 745 PM
UNTIL 200 AM CDT.

* PRIMARY THREATS INCLUDE…
ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 115
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH
NORTHWEST OF LA CROSSE WISCONSIN TO 30 MILES WEST SOUTHWEST OF
WATERLOO IOWA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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…TSTMS EXPECTED TO PERSIST AND POSSIBLE INCREASE THROUGH
LATE EVE AHEAD OF SHORTWAVE TROUGH PIVOTING SE ACROSS REGION IN
CYCLONIC WNWLY MID/UPR LVL FLOW /REF MCD 1577/. STORMS MAY FOCUS IN
TWO AREAS…/1/ ALONG/AHEAD OF WEAK COLD FRONT NOW ENTERING SW MN
AND FAR NW IA…AND /2/ ALONG SW-NE LOW-LVL CONFLUENCE AXIS OVER NE
IA/SW WI. AMPLE DEEP WNWLY SHEAR WILL BE PRESENT FOR STORM
ORGANIZATION AND SUSTENANCE…AND A CONDITIONAL RISK FOR SVR
HAIL/WIND…GIVEN SUFFICIENT LOW-LVL CONVERGENCE TO FORCE PARCELS TO
THEIR FCS.

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Severe Thunderstorm Watch (North Dakota, South Dakota)

ww0463_radar

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 463
NWS STORM PREDICTION CENTER NORMAN OK
355 PM CDT SUN AUG 17 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN AND CENTRAL NORTH DAKOTA
NORTH CENTRAL SOUTH DAKOTA

* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 355 PM UNTIL
1000 PM CDT.

* PRIMARY THREATS INCLUDE…
SCATTERED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST OF
MOBRIDGE SOUTH DAKOTA TO 60 MILES NORTH NORTHWEST OF DEVILS LAKE
NORTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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 462…

DISCUSSION…WIDELY SCATTERED STORMS ARE BEGINNING TO INCREASE OVER
SWRN AND NORTH CENTRAL ND IN ADVANCE OF A SHORT WAVE TROUGH MOVING
EWD FROM MT. THE ENVIRONMENT IS MODERATELY UNSTABLE WITH CAPE TO
2000 J/KG…AND SUFFICIENT VERTICAL SHEAR IS PRESENT TO SUPPORT
ORGANIZED MULTICELL AND ISOLATED SUPERCELL STORM STRUCTURES.
ACTIVITY SHOULD SPREAD EWD INTO THE EVENING WITH A THREAT FOR LARGE
HAIL AND STRONG WIND GUSTS.

Severe Thunderstorm Watch (Nebraska, South Dakota)

ww0462_radar_big

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 462
NWS STORM PREDICTION CENTER NORMAN OK
125 PM MDT SUN AUG 17 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN AND CENTRAL NEBRASKA
WESTERN AND SOUTH CENTRAL SOUTH DAKOTA

* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 125 PM UNTIL
900 PM MDT.

* PRIMARY THREATS INCLUDE…
SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
TO 2 INCHES IN DIAMETER POSSIBLE
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES EAST
NORTHEAST OF BUFFALO SOUTH DAKOTA TO 35 MILES SOUTH OF BROKEN BOW
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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…STORMS ARE INCREASING FROM EXTREME SRN SD INTO FAR NRN
NEB AS AN OUTFLOW BOUNDARY INTERSECTS A LOW-LEVEL MOISTURE
FEED…WHILE ADDITIONAL STORMS ARE DEVELOPING OVER THE BLACK HILLS
AND INTO FAR NWRN SD. THE AIR MASS IS DESTABILIZING OVER WRN SD IN
THE WAKE OF EARLIER STORMS…WITH STRONG INSTABILITY NOTED SWD INTO
NEB WHERE MLCAPE REACHES 2500-3000 J/KG. SUFFICIENT VERTICAL SHEAR
/30-40 KT IN THE LOWEST 6 KM AGL/ OVER THE AREA IN ADVANCE OF A
SUBTLE SHORT WAVE TROUGH ADVANCING EWD ACROSS MT AND WY WILL ENHANCE
SEVERE POTENTIAL. STRONGER STORMS INCLUDING A FEW SUPERCELLS WILL
BE CAPABLE OF PRODUCING LARGE HAIL AND DAMAGING WIND GUSTS…WITH
THE THREAT SPREADING SEWD THROUGH THE EVENING HOURS.

Severe Thunderstorm Watch (Oklahoma, Texas) #OKwx #TXwx

Severe T-Storm Watch OK TX

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 160
NWS STORM PREDICTION CENTER NORMAN OK
330 PM CDT WED MAY 15 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHERN OKLAHOMA
NORTHWEST TEXAS

* EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 330 PM UNTIL MIDNIGHT
CDT.

* PRIMARY THREATS INCLUDE…
SEVERAL VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 90 MILES WEST
NORTHWEST OF ABILENE TEXAS TO 15 MILES EAST SOUTHEAST OF DURANT
OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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…COMPLEX STORM EVOLUTION ANTICIPATED THROUGH THE EVENING
AS LIFT AND SHEAR ASSOCIATED WITH AND UPPER LOW FORMING OVER CENTRAL
OK ACT ON VERY UNSTABLE AIRMASS AHEAD OF TX DRYLINE AND ALONG/SOUTH
OF RED RIVER WARM FRONT. CURRENT CLUSTERS OF STORMS DEVELOPING
ACROSS THE WARM FRONT IN SCNTRL OK WILL CONTINUE TO POSE A
MARGINALLY SEVERE HAIL THREAT WITH STORM INTERACTIONS/MERGERS
POSSIBLY RESULTING IN BRIEFLY STRONGER UPDRAFTS AND A LOW CHANCE FOR
DAMAGING WINDS AND EVEN A TORNADO. WITH TIME FOCUS SHOULD SHIFT
SOUTH AND WEST AS SHEAR AND LIFT STRENGTHEN SOUTH OF THE MID/UPPER
LOW. PROXIMITY TO STRONGER INSTABILITY ACROSS THIS PORTION OF THE
WATCH SHOULD SUPPORT ROBUST UPDRAFTS AND POSSIBLY A FEW SUPERCELLS
WITH LARGE HAIL AND HIGH WINDS. EVENTUALLY SOME OF THIS ACTIVITY
WILL MERGE INTO ONE OR TWO CONVECTIVE SYSTEMS AND SPREAD ESEWD
ACROSS THE INSTABILITY AXIS THROUGH THE EVENING. TORNADO POTENTIAL
MAY INCREASE IF CONVECTION REMAINS DISCRETE AND INTERACTS WITH
RESIDUAL STORM-SCALE/MESOSCALE BOUNDARIES DURING THE EVENING. IF
THIS POTENTIAL BECOMES EVIDENT…PARTS OF THE REGION MAY NEED TO BE
UPGRADED TO A TORNADO WATCH.

Severe Thunderstorm Watch (South Central Texas)

Severe Thunderstorm Watch TX

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 156
NWS STORM PREDICTION CENTER NORMAN OK
235 PM CDT FRI MAY 10 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTH-CENTRAL TEXAS

* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 235 PM UNTIL
1000 PM CDT.

* PRIMARY THREATS INCLUDE…
SEVERAL SIGNIFICANT DAMAGING WIND GUSTS TO 80 MPH POSSIBLE
SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
A FEW TORNADOES POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90
STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES WEST NORTHWEST
OF SAN ANGELO TEXAS TO 35 MILES EAST NORTHEAST OF COTULLA TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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…STORMS ARE FORECAST TO INCREASE ACROSS PARTS OF CENTRAL
AND SOUTHERN TX THROUGH THE LATE AFTERNOON AND THROUGH THIS EVENING.
NUMEROUS BOUNDARIES ACROSS THE REGION AS WELL AS A STRONGER FRONTAL
SURGE SPREADING SEWD LATER TODAY/TONIGHT WILL HELP TO FOCUS STORMS
AMIDST POCKETS OF STRONG TO LOCALLY EXTREME INSTABILITY. STORMS ALSO
INITIATING OVER THE MOUNTAINS OF NRN COAHUILA MEXICO SHOULD TRACK
EWD ACROSS THE RIO GRANDE AND FURTHER POSE A THREAT OF SEVERE HAIL
AND WIND. SHEAR ACROSS THE REGION WILL REMAIN MODERATE TO STRONG
WITH INTENSE HIGH LEVEL WINDS SUPPORTING MASS EVACUATION AND UPDRAFT
POTENCY. IN ADDITION TO VERY LARGE HAIL AND A POSSIBLY EVOLVING
DAMAGING WIND THREAT…AN ISOLATED TORNADO CANNOT BE RULED OUT WITH
ANY DISCRETE CELL FORMING PREFERENTIALLY ON/ALONG REMNANT AND
STORM-SCALE BOUNDARIES WHERE LOW LEVEL MOISTURE AND SHEAR WILL BE
MAXIMIZED.

Severe Thunderstorm Watch (Louisiana, Texas)

SVR T-storm Watch LA TX

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 151
NWS STORM PREDICTION CENTER NORMAN OK
335 PM CDT THU MAY 9 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN LOUISIANA
SOUTHEAST TEXAS
COASTAL WATERS

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 335 PM UNTIL
1000 PM CDT.

* PRIMARY THREATS INCLUDE…
NUMEROUS DAMAGING WIND GUSTS LIKELY WITH A FEW SIGNIFICANT GUSTS
TO 75 MPH POSSIBLE
SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE
A FEW TORNADOES POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95
STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES NORTHEAST OF
TYLER TEXAS TO 30 MILES SOUTH SOUTHWEST OF PORT ARTHUR TEXAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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 150…

DISCUSSION…E CNTRL TX MCS WITH EMBEDDED BOWING SEGMENTS/SUSTAINED
STORMS EXPECTED TO MOVE MAINLY ESE THROUGH LATE EVE. SYSTEM WILL BE
MAINTAINED BY PERSISTENT…MOIST SSELY 0-1 KM FLOW BENEATH 35-40 KT
SW FLOW AHEAD OF S CNTRL TX UPR IMPULSE. SYSTEM MAY SOMEWHAT
ACCELERATE WITH EWD EXTENT…AND BE AUGMENTED BY ADDITIONAL STORM
DEVELOPMENT ON BOTH ITS N AND S ENDS. POTENTIAL WILL EXIST FOR DMGG
WIND…SVR HAIL…AND POSSIBLY A BRIEF TORNADO OR TWO.

Severe T-Storm Watch (KS, OK, TX)… Possible Upgrade to Tornado Watch…

SVR T-Storm Watch KS OK TX

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 149
NWS STORM PREDICTION CENTER NORMAN OK
320 PM CDT WED MAY 8 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN AND CENTRAL KANSAS
WESTERN AND CENTRAL OKLAHOMA
WEST CENTRAL AND NORTHWEST TEXAS AND EASTERN PARTS OF THE TEXAS
PANHANDLE

* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 320 PM
UNTIL 1100 PM CDT.

* PRIMARY THREATS INCLUDE…
NUMEROUS LARGE HAIL EVENTS EXPECTED WITH SEVERAL VERY LARGE HAIL
EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY
A FEW TORNADOES POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 100 MILES SOUTH
SOUTHEAST OF CHILDRESS TEXAS TO 20 MILES NORTH NORTHEAST OF
RUSSELL KANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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 148…

DISCUSSION…SCTD SUSTAINED TSTMS/SUPERCELLS EXPECTED TO FORM ALONG
AND AHEAD OF DRY LINE/LEE TROUGH EXTENDING SSW FROM SW KS SFC LOW
INTO WRN TX. STRENGTH AND DISCRETE NATURE OF STORMS WILL BE AIDED BY
RELATIVELY MODEST LOW-LVL CONVERGENCE…PERSISTENT UPR
DIFFLUENCE…AND STEEP LOW TO MID-LVL LAPSE RATES…SUGGESTING A
RISK FOR BOTH LARGE HAIL AND LOCALLY DMGG WINDS. WHILE
TEMPERATURE-DEWPOINT SPREADS ARE SIZABLE IN WW ATTM…POTENTIAL WILL
EXIST FOR CORRIDORS WITH AN ENHANCED RISK FOR LOW-LVL
ROTATION/TORNADOES GIVEN EXPECTED STORM INTERACTIONS LATER THIS
EVE..AND AS BOUNDARY LAYER BEGINS TO COOL/SSWLY LLJ STRENGTHENS.
THUS…PARTS OF THE WW MAY REQUIRE POSSIBLE UPGRADE TO TORNADO WW
LATER THIS EVE.

Severe Thunderstorm Watch (Northern Alabama, Northwest Georgia)

ww0143_overview_big_wou

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 143
NWS STORM PREDICTION CENTER NORMAN OK
525 PM CDT SAT APR 27 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN AND CENTRAL ALABAMA
NORTHWEST GEORGIA

* EFFECTIVE THIS SATURDAY AFTERNOON FROM 525 PM UNTIL MIDNIGHT
CDT.

* PRIMARY THREATS INCLUDE…
SEVERAL DAMAGING WIND GUSTS TO 60 MPH POSSIBLE
SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHEAST OF
HUNTSVILLE ALABAMA TO 30 MILES SOUTH SOUTHWEST OF BIRMINGHAM
ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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 141…WW 142…

DISCUSSION…LARGE-SCALE FORCING FOR UPWARD VERTICAL MOTION
DEVELOPING EASTWARD ACROSS THE REGION…ALONG AND JUST SOUTH OF A
SURFACE FRONTAL ZONE …IS EXPECTED TO CONTRIBUTE TO INCREASING
THUNDERSTORM ACTIVITY DURING THE NEXT FEW HOURS. IN CONJUNCTION
WITH STRONG DEEP LAYER SHEAR…DISCRETE STORMS…INCLUDING ISOLATED
SUPERCELLS…MAY EVOLVE INTO AN EASTWARD PROGRESSING ORGANIZED
CLUSTER OF STORMS BY THIS EVENING. GIVEN SOMEWHAT MARGINAL BOUNDARY
LAYER MOISTURE AND INSTABILITY…THE RISK FOR TORNADOES…WHILE
PERHAPS NOT COMPLETELY NEGLIGIBLE DUE TO SIZABLE LOW-LEVEL
SHEAR…APPEARS RELATIVELY LOW…WITH LARGE HAIL AND DAMAGING WIND
GUSTS PRIMARY SEVERE RISKS.

Severe Thunderstorm Watch (South Texas)…

ww0142_radar_big

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 142
NWS STORM PREDICTION CENTER NORMAN OK
505 PM CDT SAT APR 27 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTH TEXAS
COASTAL WATERS

* EFFECTIVE THIS SATURDAY AFTERNOON AND SUNDAY MORNING FROM 505
PM UNTIL 100 AM CDT.

* PRIMARY THREATS INCLUDE…
SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75
MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES NORTH AND SOUTH OF A LINE FROM DEL RIO TEXAS TO 30
MILES EAST SOUTHEAST OF HUNTSVILLE TEXAS. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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 141…

DISCUSSION…TSTMS FCST TO CONTINUE INCREASING IN COVERAGE THROUGH
AT LEAST EARLY EVENING ACROSS THIS AREA IN FRONTAL AND SEA-BREEZE
REGIMES…WITH OUTFLOW-BOUNDARY INTERSECTIONS ALSO OFFERING
LOCALIZED FOCI FOR TSTM INITIATION AND MAINTENANCE. WITH WWD EXTENT
ACROSS WW AREA…EXPECT GREATER DEEP SHEAR…BUOYANCY…AND EXPECTED
ORGANIZATION OF SVR POTENTIAL…INCLUDING RISK OF
SIGNIFICANT/DAMAGING HAIL WITH ANY RELATIVELY DISCRETE SUPERCELLS.
HOWEVER…OVERALL COVERAGE MAY CONTINUE TO BE GREATER WITH EWD
EXTENT INTO SOMEWHAT WEAKER PARAMETER SPACE. DAMAGING GUSTS AND
LARGE HAIL THEREFORE ARE POSSIBLE ACROSS ENTIRE WW AREA.

Severe Thunderstorm Watch (Indiana, Kentucky, Ohio, Pennsylvania, West Virginia)

Severe T-Storm Watch OH IN KY WV PA

URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 111
NWS STORM PREDICTION CENTER NORMAN OK
345 PM EDT TUE APR 16 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PARTS OF SOUTHEAST INDIANA
PARTS OF NORTH CENTRAL AND NORTHEAST KENTUCKY
MUCH OF SOUTHERN AND EASTERN OHIO
WESTERN PENNSYLVANIA
PARTS OF NORTHERN WEST VIRGINIA

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL
1100 PM EDT.

* PRIMARY THREATS INCLUDE…
SEVERAL DAMAGING WIND GUSTS TO 60 MPH POSSIBLE
SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 120
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTHWEST OF
ATHENS OHIO TO 25 MILES NORTH NORTHEAST OF AKRON OHIO. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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…THE ENVIRONMENT IS BECOMING CONDUCIVE TO THE EVOLUTION
OF AN ORGANIZED CLUSTER OF THUNDERSTORMS ACROSS OHIO LATE THIS
AFTERNOON …WITH AN ACCOMPANYING RISK FOR LARGE HAIL AND STRONG
WIND GUSTS AS IT DEVELOPS EASTWARD OR EAST SOUTHEASTWARD TOWARD THE
WESTERN SLOPES OF THE NORTH CENTRAL APPALACHIANS THROUGH THIS
EVENING.

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