

460 

WWUS20 KWNS 221930

SEL8

SPC WW 221930

MIZ000-LEZ000-LHZ000-230000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 328

NWS STORM PREDICTION CENTER NORMAN OK

330 PM EDT SUN MAY 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST LOWER MICHIGAN

       LAKE ERIE

       LAKE HURON



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 330 PM UNTIL 800

PM EDT.



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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF

SAGINAW MICHIGAN TO 30 MILES SOUTH SOUTHEAST OF ANN ARBOR

MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 322...WW 323...WW

324...WW 325...WW 326...WW 327...



DISCUSSION...ISOLATED SEVERE STORMS WILL BE POSSIBLE ACROSS THE WW

AREA THIS AFTERNOON INTO EVENING OWING TO THE PRESENCE OF A MOIST

AND MODERATELY UNSTABLE AIR MASS WITH MLCAPE VALUES OF 2000 J/KG.

WHEN COUPLED WITH 35-40 KT OF DEEP-LAYER SHEAR...SETUP WILL FAVOR

THE DEVELOPMENT OF SUPERCELLS CAPABLE OF LARGE HAIL AND LOCALLY

DAMAGING WIND GUSTS.



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 500. MEAN STORM

MOTION VECTOR 25025.





...MEAD



800 

WWUS20 KWNS 221930

SEL8

SPC WW 221930

MIZ000-LEZ000-LHZ000-230000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 328

NWS STORM PREDICTION CENTER NORMAN OK

330 PM EDT SUN MAY 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST LOWER MICHIGAN

       LAKE ERIE

       LAKE HURON



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 330 PM UNTIL 800

PM EDT.



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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHEAST OF

SAGINAW MICHIGAN TO 30 MILES SOUTH SOUTHEAST OF ANN ARBOR

MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 322...WW 323...WW

324...WW 325...WW 326...WW 327...



DISCUSSION...ISOLATED SEVERE STORMS WILL BE POSSIBLE ACROSS THE WW

AREA THIS AFTERNOON INTO EVENING OWING TO THE PRESENCE OF A MOIST

AND MODERATELY UNSTABLE AIR MASS WITH MLCAPE VALUES OF 2000 J/KG.

WHEN COUPLED WITH 35-40 KT OF DEEP-LAYER SHEAR...SETUP WILL FAVOR

THE DEVELOPMENT OF SUPERCELLS CAPABLE OF LARGE HAIL AND LOCALLY

DAMAGING WIND GUSTS.



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 500. MEAN STORM

MOTION VECTOR 25025.





...MEAD

