

367 

WWUS20 KWNS 060118

SEL3

SPC WW 060118

MNZ000-SDZ000-060600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 253

NWS STORM PREDICTION CENTER NORMAN OK

820 PM CDT SAT MAY 5 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST CENTRAL MINNESOTA

       NORTHEAST SOUTH DAKOTA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 820 PM

UNTIL 100 AM 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 35

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST

NORTHWEST OF WATERTOWN SOUTH DAKOTA TO 50 MILES EAST SOUTHEAST OF

ORTONVILLE MINNESOTA.  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 249...WW 250...WW

251...WW 252...



DISCUSSION...A CLUSTER OF ELEVATED THUNDERSTORMS WILL CONTINUE TO

SPREAD NEWD INTO NE SD/W CENTRAL MN...ALONG THE NRN FRINGE OF A WAA

REGIME WITH MUCAPE NEAR 2000 J/KG...ROOTED NEAR 800 MB.  THE

COMBINATION OF MODERATE BUOYANCY/STEEP MIDLEVEL LAPSE RATES AND

STRONG CLOUD-LAYER SHEAR WILL SUPPORT ORGANIZED STORMS CAPABLE OF

PRODUCING LARGE HAIL FOR THE NEXT FEW HOURS.



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 24030.





...THOMPSON

