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348 

WWUS20 KWNS 220335

SEL6

SPC WW 220335

COZ000-KSZ000-NEZ000-221000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 376

NWS STORM PREDICTION CENTER NORMAN OK

1035 PM CDT MON JUN 21 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR NORTHEASTERN COLORADO

       NORTHWESTERN KANSAS

       SOUTHERN AND CENTRAL NEBRASKA



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1035 PM

UNTIL 500 AM CDT.



HAIL TO 2.5 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 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES NORTH

NORTHWEST OF BURLINGTON COLORADO TO 45 MILES EAST OF HASTINGS

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 372. WATCH NUMBER 372 WILL NOT

BE IN EFFECT AFTER 1035 PM CDT. CONTINUE...WW 371...WW 373...WW

374...WW 375...



DISCUSSION...SUPERCELLS OVER NWRN KS ARE EXPECTED TO GRADUALLY

SPREAD EWD... WHILE A STRENGTHENING LOW LEVEL JET AND WARM ADVECTION

RESULTS IN OTHER STORMS DEVELOPING NORTH OF SURFACE BOUNDARY IN ERN

CO AND NRN KS. LARGE HAIL WILL BE THE PRIMARY THREAT FOR THE NEXT

COUPLE OF HOURS. HOWEVER...STORM DOWNDRAFTS MAY MERGE LATER IN THE

NIGHT WITH THE POTENTIAL FOR A LINEAR MCS AND WIND DAMAGE.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27020.





...IMY

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