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

Wednesday, September 22, 2010

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

SPC Tornado Watch 684
Wed, 22 Sep 2010 16:03:03 -0500

URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 684 NWS STORM PREDICTION CENTER NORMAN OK 400 PM CDT WED SEP 22 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF NORTHERN AND WESTERN NEBRASKA SOUTHEAST SOUTH DAKOTA EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 400 PM UNTIL 1100 PM CDT. TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES EAST SOUTHEAST OF YANKTON SOUTH DAKOTA TO 60 MILES SOUTHWEST OF MULLEN NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4). 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 680...WW 681...WW 682...WW 683... DISCUSSION...APPROACH OF UPSTREAM IMPULSE FROM THE CNTRL ROCKIES IS EXPECTED TO SUPPORT AN INCREASE IN TSTMS LATE THIS AFTERNOON INTO EVENING FROM VICINITY OF THE WARM FRONT OVER NRN NEB SWWD ALONG LEE TROUGH INTO WRN NEB. BASED ON 18Z LBF/20Z OAX SOUNDINGS...AMBIENT AIR MASS IS MOIST AND MODERATELY UNSTABLE WITH MLCAPE OF 2000-3000 J/KG AND A DECREASING CAP. THE STRONGEST LOW-LEVEL SHEAR AND ASSOCIATED TORNADO THREAT IS EXPECTED ALONG THE WARM FRONT THIS EVENING. HOWEVER...SUPERCELLS CAPABLE OF A TORNADO OR TWO WILL BE POSSIBLE WITH ANY STORMS THAT CAN DEVELOP AND BECOME SUSTAINED ALONG THE LEE TROUGH. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 25030. ...MEAD

SPC Tornado Watch 684 Status Reports
Wed, 22 Sep 2010 16:03:11 -0500

  STATUS FOR WATCH 0684 HAS NOT BEEN ISSUED YET

SPC Severe Thunderstorm Watch 683 Status Reports
Wed, 22 Sep 2010 14:46:11 -0500

  STATUS FOR WATCH 0683 HAS NOT BEEN ISSUED YET

SPC Severe Thunderstorm Watch 682 Status Reports
Wed, 22 Sep 2010 15:18:06 -0500

  STATUS REPORT ON WW 682  THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.  ..GRAMS..09/22/10  ATTN...WFO...LWX...   STATUS REPORT FOR WS 682   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   DCC001-222140-  DC  .    DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE  DISTRICT OF COLUMBIA    MDC001-003-005-009-013-017-021-025-027-031-033-037-043-510- 222140-  MD  .    MARYLAND COUNTIES INCLUDED ARE  ALLEGANY             ANNE ARUNDEL        BALTIMORE            CALVERT              CARROLL             CHARLES              FREDERICK            HARFORD             HOWARD               MONTGOMERY           PRINCE GEORGES      ST. MARYS            WASHINGTON              MARYLAND INDEPENDENT CITIES INCLUDED ARE  BALTIMORE CITY

SPC Severe Thunderstorm Watch 681 Status Reports
Wed, 22 Sep 2010 15:17:04 -0500

  STATUS REPORT ON WW 681  SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 S CAK TO 20 S DUJ TO 40 SE BFD.  FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1896.  ..GRAMS..09/22/10  ATTN...WFO...PBZ...RLX...CTP...   STATUS REPORT FOR WS 681   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   MDC023-222140-  MD  .    MARYLAND COUNTIES INCLUDED ARE  GARRETT                 OHC009-013-059-067-081-111-115-121-157-167-222140-  OH  .    OHIO COUNTIES INCLUDED ARE  ATHENS               BELMONT             GUERNSEY             HARRISON             JEFFERSON           MONROE               MORGAN               NOBLE               TUSCARAWAS           WASHINGTON              PAC001-003-009-013-021-027-033-035-037-041-043-051-055-057-059- 061-063-067-071-075-081-087-093-097-099-107-109-111-113-117-119- 125-129-133-222140-

SPC Severe Thunderstorm Watch 680 Status Reports
Wed, 22 Sep 2010 15:27:04 -0500

  STATUS REPORT ON WW 680  THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.  ..GUYER..09/22/10  ATTN...WFO...FSD...DMX...MPX...OAX...   STATUS REPORT FOR WS 680   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   IAC021-035-041-059-063-091-093-109-119-141-143-147-149-151-167- 193-222140-  IA  .    IOWA COUNTIES INCLUDED ARE  BUENA VISTA          CHEROKEE            CLAY                 DICKINSON            EMMET               HUMBOLDT             IDA                  KOSSUTH             LYON                 O'BRIEN              OSCEOLA             PALO ALTO            PLYMOUTH             POCAHONTAS          SIOUX                WOODBURY                MNC013-015-033-043-063-081-083-085-091-101-103-105-117-127-129- 133-143-165-173-222140-  MN  .    MINNESOTA COUNTIES INCLUDED ARE  BLUE EARTH           BROWN               COTTONWOOD           FARIBAULT            JACKSON             LINCOLN              LYON                 MCLEOD              MARTIN               MURRAY               NICOLLET            NOBLES               PIPESTONE            REDWOOD             RENVILLE             ROCK                 SIBLEY              WATONWAN

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