Tornado Alley (PROG)

[F6]

Particularly Dangerous Situation (PDS) Tornado Watch 559

    URGENT - IMMEDIATE BROADCAST REQUESTED 
    TORNADO WATCH NUMBER 559 
    NWS STORM PREDICTION CENTER NORMAN OK 
    1155 AM CST WED DEC 23 2015 
  
    THE NWS STORM PREDICTION CENTER HAS ISSUED A 
  
    * TORNADO WATCH FOR PORTIONS OF  
      SOUTHEAST ARKANSAS 
      FAR NORTHEAST LOUISIANA 
      NORTHERN AND WESTERN MISSISSIPPI 
      WESTERN TENNESSEE 
  
    * EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1155 AM UNTIL 
      800 PM CST. 
  
    ...THIS IS A PARTICULARLY DANGEROUS SITUATION... 
  
    * PRIMARY THREATS INCLUDE... 
      SEVERAL TORNADOES AND A FEW INTENSE TORNADOES LIKELY 
      SCATTERED DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS 
        TO 75 MPH POSSIBLE 
      ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE 
  
    SUMMARY...ONGOING SEVERE STORMS EAST OF LITTLE ROCK SHOULD INTENSIFY 
    THROUGH THE AFTERNOON WITH ADDITIONAL STORMS FORMING SOUTHWARD 
    ACROSS THE ARK-LA-MISS REGION. ENVIRONMENT IS CONDUCIVE TO 
    LONG-TRACK SUPERCELLS WITH SIGNIFICANT TORNADOES AND DAMAGING WINDS 
    AS THE PRIMARY HAZARDS. 
  
    THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE 
    MILES EAST AND WEST OF A LINE FROM 10 MILES NORTHEAST OF 
    DYERSBURG TENNESSEE TO 50 MILES EAST OF MONROE LOUISIANA.  FOR A 
    COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE 
    UPDATE (WOUS64 KWNS WOU9). 
  
    PRECAUTIONARY/PREPAREDNESS ACTIONS... 
  
    REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR 
    TORNADOES AND 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. 
  
    && 
  
    OTHER WATCH INFORMATION...CONTINUE...WW 557...WW 558... 
  
    AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL 
    SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE 
    WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 
    500. MEAN STORM MOTION VECTOR 22045. 
  
  
    ...GRAMS

http://www.spc.noaa.gov/products/watch/ww0559.html [note: I haven't been able to find a source that confirms this is correct, but I have seen a report that this is the first PDS Tornado Watch issued this year]

---

Storm Prediction Center
http://www.spc.noaa.gov/

Current Day 1 Convective Outlook
http://www.spc.noaa.gov/products/outlook/day1otlk.html

Current Mesoscale Discussions
http://www.spc.noaa.gov/products/md/

Current Convective Watches
http://www.spc.noaa.gov/products/watch/

Severe Weather and Flash Flood Warnings and Severe Weather Statements
http://kamala.cod.edu/svr/