Compact News: NOAA's National Weather Service SPC Tornado/Severe Thunderstorm Watches Update

Saturday, September 18, 2010

NOAA's National Weather Service SPC Tornado/Severe Thunderstorm Watches Update

SPC Severe Thunderstorm Watch 673
Sat, 18 Sep 2010 21:30:04 -0500

URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 673 NWS STORM PREDICTION CENTER NORMAN OK 930 PM CDT SAT SEP 18 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EXTREME SOUTH CENTRAL IOWA EXTREME WEST CENTRAL ILLINOIS NORTHERN MISSOURI EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 930 PM UNTIL 500 AM 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 40 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST SOUTHWEST OF LAMONI IOWA TO 40 MILES SOUTHEAST OF QUINCY ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3). 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 672... DISCUSSION...ELEVATED THUNDERSTORMS WILL LIKELY INCREASE IN COVERAGE OVERNIGHT AS LOW-LEVEL WAA INCREASES ABOVE THE SURFACE COLD FRONT ACROSS NRN MO. MUCAPE OF 1500-2000 J/KG BASED NEAR 850 MB AND EFFECTIVE BULK SHEAR IN EXCESS OF 50 KT WILL BE SUPPORTIVE OF ELEVATED SUPERCELLS CAPABLE OF PRODUCING LARGE HAIL. THE CONVECTION FARTHER S IN MO IS EXPECTED TO SLOWLY WEAKEN IN THE NEXT 1-2 HOURS...WITH A LIKEWISE REDUCTION IN THE HAIL/WIND THREAT. 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 28020. ...THOMPSON

SPC Severe Thunderstorm Watch 673 Status Reports
Sat, 18 Sep 2010 21:30:12 -0500

  STATUS FOR WATCH 0673 HAS NOT BEEN ISSUED YET

SPC Severe Thunderstorm Watch 672 Status Reports
Sat, 18 Sep 2010 21:29:04 -0500

  STATUS REPORT ON WW 672  SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 N SGF TO 40 SSW OJC TO 20 ENE EMP TO 20 SSE MHK TO 25 NNE MHK.  ..JEWELL..09/19/10  ATTN...WFO...ICT...TOP...EAX...SGF...LSX...   STATUS REPORT FOR WS 672   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   ILC013-061-083-119-190340-  IL  .    ILLINOIS COUNTIES INCLUDED ARE  CALHOUN              GREENE              JERSEY               MADISON                 KSC045-059-087-091-103-121-139-177-197-209-190340-  KS  .    KANSAS COUNTIES INCLUDED ARE  DOUGLAS              FRANKLIN            JEFFERSON            JOHNSON              LEAVENWORTH         MIAMI                OSAGE                SHAWNEE             WABAUNSEE            WYANDOTTE               MOC007-013-015-019-027-029-033-037-041-051-053-055-071-073-083- 085-089-095-101-107-113-125-131-135-139-141-151-159-161-169-175- 183-185-189-195-219-510-190340-  MO

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