

253 

WWUS20 KWNS 012212

SEL9

SPC WW 012212

MNZ000-SDZ000-020600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 549

NWS STORM PREDICTION CENTER NORMAN OK

515 PM CDT WED AUG 1 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN MINNESOTA

       EASTERN SOUTH DAKOTA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND THURSDAY MORNING FROM 515

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 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTHWEST

OF WATERTOWN SOUTH DAKOTA TO 35 MILES SOUTHEAST OF MINNEAPOLIS

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 544...WW 546...WW

547...WW 548...



DISCUSSION...SCATTERED THUNDERSTORMS ARE INCREASING ALONG THE SD/MN

BORDER...ALONG A WEAK SURFACE BOUNDARY.  THESE STORMS ARE EXPECTED

TO CONTINUE TO BUILD EASTWARD ACROSS MN AND SAG SOUTHWARD TOWARD THE

IA BORDER THIS EVENING.  INCREASING DEEP LAYER VERTICAL SHEAR AND

HIGH CAPE VALUES WILL PROMOTE A RISK OF A FEW SUPERCELLS CAPABLE OF

LARGE HAIL AND DAMAGING WINDS.



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 28030.





...HART

