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Severe Thunderstorm Watch 170
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WW0170 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Moderate

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL0
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 170
   NWS STORM PREDICTION CENTER NORMAN OK
   425 PM CDT SAT APR 18 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHWEST ARKANSAS
          SOUTHEAST KANSAS
          SOUTHWEST MISSOURI
          NORTHEAST OKLAHOMA
   
   EFFECTIVE THIS SATURDAY AFTERNOON FROM 425 PM UNTIL MIDNIGHT 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 85
   STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH
   NORTHEAST OF CHANUTE KANSAS TO 30 MILES SOUTH SOUTHEAST OF POTEAU
   OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).
   
   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 166...WW 167...WW
   168...WW 169...
   
   DISCUSSION...THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER AND
   INTENSITY ACROSS WATCH AREA THRU THE EVENING AS UPPER TROUGH
   APPROACHES. STEEP...COOL LAPSE RATES IN PLACE COUPLED A
   MOIST/UNSTABLE AIR MASS WILL BE CONDUCIVE TO LARGE HAIL IN MANY
   STORMS.  SUFFICIENT SHEAR FOR ROTATING STORMS BY EVENING AS UPPER
   TROUGH APPROACHES. SOME OF AREA WILL BE MONITORED FOR POSSIBLE
   UPGRADE TO TORNADO WATCH IF THESE CONDITIONS DEVELOP
   
   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 450. MEAN STORM
   MOTION VECTOR 24025.
   
   
   ...HALES
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