

793 

WWUS20 KWNS 042315

SEL1

SPC WW 042315

COZ000-KSZ000-NEZ000-SDZ000-050700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 221

NWS STORM PREDICTION CENTER NORMAN OK

515 PM MDT WED JUN 4 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN COLORADO

  NORTHWEST KANSAS

  WESTERN NEBRASKA

  WESTERN SOUTH DAKOTA



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND THURSDAY MORNING FROM

  515 PM UNTIL 100 AM MDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS

    TO 2 INCHES IN DIAMETER POSSIBLE

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A TORNADO OR TWO POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES EAST AND WEST OF A LINE FROM 90 MILES NORTH

NORTHEAST OF RAPID CITY SOUTH DAKOTA TO 50 MILES SOUTH SOUTHWEST

OF BURLINGTON COLORADO.  FOR A COMPLETE DEPICTION OF THE WATCH

SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 218...WW 219...WW 220...



DISCUSSION...SCTD AREAS OF TSTMS...INCLUDING CLUSTERS OF SUSTAINED

STORMS AND A FEW SUPERCELLS WITH LARGE HAIL/DMGG WIND AND POSSIBLY A

TORNADO...EXPECTED TO PERSIST/POSSIBLY INCREASE IN WW AREA THROUGH

LATE TNGT. THE ACTIVITY WILL BE PROMOTED BY UPSLOPE COMPONENT TO

FAIRLY MOIST LOW-LVL FLOW. STORMS MAY EVOLVE INTO A COUPLE SIZABLE

MCSS...WITH FORWARD-PROPAGATING/ESE-MOVING SEGMENTS CAPABLE OF SVR

WIND/HAIL.



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 30025.





...CORFIDI

