

078 

WWUS20 KWNS 202245

SEL8

SPC WW 202245

IAZ000-NEZ000-210400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 338

NWS STORM PREDICTION CENTER NORMAN OK

545 PM CDT FRI JUN 20 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND NORTHERN IOWA

  SMALL PART OF EXTREME EASTERN NEBRASKA



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 545 PM UNTIL

  1100 PM CDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45

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

SOUTHEAST OF DENISON IOWA TO 35 MILES WEST NORTHWEST OF MASON

CITY IOWA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 336...WW 337...



DISCUSSION...INCREASINGLY ORGANIZED AND PRIMARILY MULTICELLULAR TSTM

CLUSTER...WITH SPORADIC/MRGL/EMBEDDED SUPERCELL STRUCTURES...IS

EXPECTED TO MOVE EWD FROM WW 336 INTO NARROW CORRIDOR OF FAVORABLE

INSTABILITY W OF I-35...SUPPORTING RISK FOR HAIL AND DAMAGING GUSTS.

 REF SPC MESOSCALE DISCUSSION 1097 FOR ADDITIONAL INFO.



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 27020.





...EDWARDS

