

445 

WWUS20 KWNS 190228

SEL5

SPC WW 190228

IAZ000-NEZ000-SDZ000-190900-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 175

NWS STORM PREDICTION CENTER NORMAN OK

925 PM CDT SAT MAY 18 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN IOWA

  EASTERN NEBRASKA

  SOUTHEAST SOUTH DAKOTA



* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 925 PM

  UNTIL 400 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTHWEST OF

YANKTON SOUTH DAKOTA TO 10 MILES EAST SOUTHEAST OF FALLS CITY

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 170...WW 171...WW

172...WW 173...WW 174...



DISCUSSION...E CNTRL/SE NEB SQLN EXPECTED TO CONTINUE MAINLY

NEWD...WITH A CONTINUING THREAT FOR DMGG WIND...MARGINALLY SVR

HAIL... AND POSSIBLY A TORNADO AS MID TROPOSPHERIC SPEED MAX MOVES

NEWD WITH IT. MOIST...LOW-LVL SSELY FLOW AHEAD OF SQLN WILL MAINTAIN

POTENTIAL FOR LOW-LVL MESO CIRCULATIONS AND PERHAPS A BRIEF

TORNADO...BUT GRADUALLY STRENGTHENING CIN SHOULD LIMIT OVERALL

UPDRAFT STRENGTH/LONGEVITY...AND THE POTENTIAL FOR TORNADOES.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 22030.





...CORFIDI

