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438 

WWUS20 KWNS 142047

SEL4

SPC WW 142047

MNZ000-150300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 474

NWS STORM PREDICTION CENTER NORMAN OK

350 PM CDT WED JUL 14 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PART OF CENTRAL AND NORTHEAST MINNESOTA INCLUDING THE

ARROWHEAD



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 350 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 50

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTH

SOUTHEAST OF SAINT CLOUD MINNESOTA TO 75 MILES NORTH OF HIBBING

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 472...WW 473...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND STRENGTH

ALONG DEEP-LAYER WIND SHIFT PROGRESSING EWD THROUGH THE REGION.

AMBIENT AIR MASS REMAINS QUITE MOIST AND RELATIVELY WARM WITH MLCAPE

OF 1000-1500 J/KG.  AREA VWPS INDICATE THAT VERTICAL SHEAR IS QUITE

STRONG AND SUPPORTIVE OF SUPERCELL STRUCTURES.  WHILE A TORNADO IS

POSSIBLE...LARGE HAIL AND DAMAGING WIND GUSTS WILL BE THE MAIN

THREATS.



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

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