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

Tuesday, September 21, 2010

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

SPC Severe Thunderstorm Watch 678
Tue, 21 Sep 2010 19:00:03 -0500

URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 678 NWS STORM PREDICTION CENTER NORMAN OK 155 PM CDT TUE SEP 21 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHERN IOWA FAR WEST-CENTRAL ILLINOIS NORTHERN MISSOURI EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL 900 PM CDT. HAIL TO 1.5 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 65 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTH OF KANSAS CITY MISSOURI TO 20 MILES NORTHEAST OF KIRKSVILLE MISSOURI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8). 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 676...WW 677... DISCUSSION...TSTMS ARE EXPECTED TO INTENSIFY THIS AFTERNOON AHEAD OF WELL-DEFINED VORTICITY MAXIMUM CURRENTLY OVER NERN KS/SERN NEB. AMBIENT WARM SECTOR AIR MASS IS WARM AND MOIST WITH MLCAPE VALUES OF 1500-2500 J/KG. WHILE REGION RESIDES ALONG SRN FRINGE OF STRONGER MID AND HIGH-LEVEL FLOW ATTENDANT TO UPPER GREAT LAKES TROUGH...AREA PROFILER DATA INDICATE SUFFICIENT DEEP SWLY SHEAR TO SUPPORT ORGANIZED MULTICELLS AND BOWING STRUCTURES CAPABLE OF DAMAGING WINDS AND HAIL. 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 26030. ...MEAD

SPC Severe Thunderstorm Watch 677
Tue, 21 Sep 2010 19:00:07 -0500

URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 677 NWS STORM PREDICTION CENTER NORMAN OK 130 PM CDT TUE SEP 21 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHEAST IOWA NORTHERN ILLINOIS FAR NORTHEAST MISSOURI FAR SOUTHERN WISCONSIN LAKE MICHIGAN EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 130 PM UNTIL 900 PM CDT. HAIL TO 1.5 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 60 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES SOUTH SOUTHWEST OF CEDAR RAPIDS IOWA TO 55 MILES EAST OF ROCKFORD ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7). 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 676... DISCUSSION...TSTMS DEVELOPING OVER PARTS OF ERN/SERN IA SHOULD CONTINUE TO INTENSIFY THIS AFTERNOON WHILE PROGRESSING EWD/SEWD THROUGH A MOIST AND MODERATELY UNSTABLE AIR MASS WITH MLCAPE OF 1000-2000 J/KG. REGIONAL PROFILER AND VWP DATA SHOW THAT MODESTLY STRONG UNIDIRECTIONAL TROPOSPHERIC FLOW IS IN PLACE ACROSS THE WARM SECTOR WHICH WILL BE SUPPORTIVE OF UPSCALE GROWTH OF STORMS INTO ONE OR MORE MCS/S WITH THE PRIMARY HAZARDS BEING DAMAGING WIND GUSTS AND HAIL. 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 27035. ...MEAD

SPC Severe Thunderstorm Watch 676
Tue, 21 Sep 2010 19:00:10 -0500

URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 676 NWS STORM PREDICTION CENTER NORMAN OK 155 PM EDT TUE SEP 21 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN AND CENTRAL LOWER MICHIGAN LAKE HURON LAKE MICHIGAN EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL 900 PM EDT. HAIL TO 1.5 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 65 STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTHEAST OF ROBEN HOOD MICHIGAN TO 30 MILES NORTH OF ALPENA MICHIGAN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). 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. DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY THIS AFTERNOON AHEAD OF STRONG MIDLEVEL IMPULSE PROGRESSING EWD THROUGH THE REGION. STRONG DIABATIC HEATING HAS CONTRIBUTED TO SBCAPE OF 1000-1500 J/KG...AND EFFECTIVELY STEEPENED LOW-LEVEL LAPSE RATES. WHEN COUPLED WITH 40-50+ KT SWLY FLOW OBSERVED AS LOW AS 1-2 KM AGL /PER APX VWP/...ENVIRONMENT WILL FAVOR THE DEVELOPMENT OF ORGANIZED...SEVERE STORMS CAPABLE OF MAINLY DAMAGING WIND GUSTS. 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 26035. ...MEAD

SPC Severe Thunderstorm Watch 678 Status Reports
Tue, 21 Sep 2010 19:00:05 -0500

  STATUS REPORT ON WW 678  SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 W LWD TO 25 E LWD TO 35 SSE OTM.  FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1875  ..GARNER..09/21/10  ATTN...WFO...DMX...LSX...EAX...   STATUS REPORT FOR WS 678   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   ILC001-220040-  IL  .    ILLINOIS COUNTIES INCLUDED ARE  ADAMS                   MOC001-003-021-025-033-041-047-049-061-063-075-079-081-087-089- 095-103-107-111-115-117-121-127-129-137-147-165-171-175-177-195- 197-205-211-227-220040-  MO  .    MISSOURI COUNTIES INCLUDED ARE  ADAIR                ANDREW              BUCHANAN             CALDWELL             CARROLL             CHARITON             CLAY                 CLINTON             DAVIESS              DEKALB               GENTRY              GRUNDY               HARRISON             HOLT                HOWARD               JACKSON              KNOX                LAFAYETTE            LEWIS                LINN                LIVINGSTON           MACON                MARION              MERCER

SPC Severe Thunderstorm Watch 677 Status Reports
Tue, 21 Sep 2010 19:00:09 -0500

  STATUS REPORT ON WW 677  SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 SSE OTM TO 25 SW BRL TO 35 E BRL TO 35 WSW MMO TO 40 ESE RFD TO 10 NW MKE.  ..PETERS..09/21/10  ATTN...WFO...DVN...LOT...ILX...MKX...   STATUS REPORT FOR WS 677   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   ILC031-043-053-057-063-067-075-089-091-093-095-097-099-105-109- 123-143-175-197-220040-  IL  .    ILLINOIS COUNTIES INCLUDED ARE  COOK                 DUPAGE              FORD                 FULTON               GRUNDY              HANCOCK              IROQUOIS             KANE                KANKAKEE             KENDALL              KNOX                LAKE                 LA SALLE             LIVINGSTON          MCDONOUGH            MARSHALL             PEORIA              STARK                WILL                    MOC045-199-220040-  MO  .    MISSOURI COUNTIES INCLUDED ARE  CLARK                SCOTLAND               WIC059-079-101-220040-

SPC Severe Thunderstorm Watch 676 Status Reports
Tue, 21 Sep 2010 19:00:12 -0500

  STATUS REPORT ON WW 676  SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NE TVC TO 45 ESE APN.  FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1876.  ..PETERS..09/21/10  ATTN...WFO...APX...DTX...GRR...   STATUS REPORT FOR WS 676   SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS   MIC001-011-017-019-035-039-051-055-057-063-069-073-079-085-101- 105-107-111-113-117-121-123-127-129-133-135-143-145-157-165- 212340-  MI  .    MICHIGAN COUNTIES INCLUDED ARE  ALCONA               ARENAC              BAY                  BENZIE               CLARE               CRAWFORD             GLADWIN              GRAND TRAVERSE      GRATIOT              HURON                IOSCO               ISABELLA             KALKASKA             LAKE                MANISTEE             MASON                MECOSTA             MIDLAND              MISSAUKEE            MONTCALM            MUSKEGON             NEWAYGO              OCEANA              OGEMAW               OSCEOLA              OSCODA              ROSCOMMON            SAGINAW              TUSCOLA             WEXFORD                LHZ348-349-362-363-421-422-441-462-LMZ346-847-848-849-212340-  CW

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