SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 454
   NWS STORM PREDICTION CENTER NORMAN OK
   1100 PM CDT WED JUN 17 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EXTREME NORTHEAST COLORADO
          WESTERN AND NORTHERN NEBRASKA
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1100 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 70
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTHWEST
   OF ALLIANCE NEBRASKA TO 35 MILES NORTHEAST OF BROKEN BOW
   NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
   
   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...THIS SEVERE THUNDERSTORM WATCH REPLACES
   TORNADO WATCH NUMBER 445. WATCH NUMBER 445 WILL NOT BE IN EFFECT
   AFTER 1100 PM CDT. CONTINUE...WW 446...WW 447...WW 448...WW
   449...WW 450...WW 451...WW 452...WW 453...
   
   DISCUSSION...THUNDERSTORMS FROM NE CO INTO THE NEB PANHANDLE MAY
   CONSOLIDATE INTO A SMALL MCS AND MOVE EWD ACROSS NEB THROUGH THE
   EARLY MORNING HOURS.  A CORRIDOR OF MODERATE INSTABILITY AND
   EFFECTIVE BULK SHEAR OF 50-60 KT WILL SUPPORT SUPERCELLS AND
   POTENTIALLY A BOWING CLUSTER CAPABLE OF PRODUCING LARGE HAIL AND
   DAMAGING WINDS.
   
   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 27030.
   
   
   ...THOMPSON

   SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 454
   NWS STORM PREDICTION CENTER NORMAN OK
   1100 PM CDT WED JUN 17 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          EXTREME NORTHEAST COLORADO
          WESTERN AND NORTHERN NEBRASKA
   
   EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1100 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 70
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTHWEST
   OF ALLIANCE NEBRASKA TO 35 MILES NORTHEAST OF BROKEN BOW
   NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
   
   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...THIS SEVERE THUNDERSTORM WATCH REPLACES
   TORNADO WATCH NUMBER 445. WATCH NUMBER 445 WILL NOT BE IN EFFECT
   AFTER 1100 PM CDT. CONTINUE...WW 446...WW 447...WW 448...WW
   449...WW 450...WW 451...WW 452...WW 453...
   
   DISCUSSION...THUNDERSTORMS FROM NE CO INTO THE NEB PANHANDLE MAY
   CONSOLIDATE INTO A SMALL MCS AND MOVE EWD ACROSS NEB THROUGH THE
   EARLY MORNING HOURS.  A CORRIDOR OF MODERATE INSTABILITY AND
   EFFECTIVE BULK SHEAR OF 50-60 KT WILL SUPPORT SUPERCELLS AND
   POTENTIALLY A BOWING CLUSTER CAPABLE OF PRODUCING LARGE HAIL AND
   DAMAGING WINDS.
   
   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 27030.
   
   
   ...THOMPSON

   WOUS64 KWNS 180355
   WOU4
   
   BULLETIN - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 454
   NWS STORM PREDICTION CENTER NORMAN OK
   1100 PM CDT WED JUN 17 2009
   
   SEVERE THUNDERSTORM WATCH 454 IS IN EFFECT UNTIL 500 AM CDT
   FOR THE FOLLOWING LOCATIONS
   
   COC075-095-115-181000-
   /O.NEW.KWNS.SV.A.0454.090618T0400Z-090618T1000Z/
   
   CO 
   .    COLORADO COUNTIES INCLUDED ARE
   
   LOGAN                PHILLIPS            SEDGWICK            
   
   
   NEC005-009-015-017-031-033-041-049-069-071-075-089-091-101-103-
   111-113-115-117-123-135-149-161-171-183-181000-
   /O.NEW.KWNS.SV.A.0454.090618T0400Z-090618T1000Z/
   
   NE 
   .    NEBRASKA COUNTIES INCLUDED ARE
   
   ARTHUR               BLAINE              BOYD                
   BROWN                CHERRY              CHEYENNE            
   CUSTER               DEUEL               GARDEN              
   GARFIELD             GRANT               HOLT                
   HOOKER               KEITH               KEYA PAHA           
   LINCOLN              LOGAN               LOUP                
   MCPHERSON            MORRILL             PERKINS             
   ROCK                 SHERIDAN            THOMAS              
   WHEELER              
   
   
   ATTN...WFO...BOU...LBF...CYS...
   
   
   

   SAW4 
   WW 454 SEVERE TSTM CO NE 180400Z - 181000Z
   AXIS..70 STATUTE MILES NORTH AND SOUTH OF LINE..
   30SW AIA/ALLIANCE NE/ - 35NE BBW/BROKEN BOW NE/
   ..AVIATION COORDS.. 60NM N/S /15SE BFF - 43NW OBH/
   HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
   MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27030.
   
   REPLACES WW 445..CO KS NE WY 
   
   LAT...LON 42750320 42799915 40779915 40720320
   
   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU4.
   

Watch 454 Status Report Messages:

STATUS REPORT #3 ON WW 454

VALID 180755Z - 180840Z

SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 N EAR TO
25 SSE MHN TO 15 NNE ANW.

FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1196

..CARBIN..06/18/09

ATTN...WFO...BOU...LBF...CYS...

&&

STATUS REPORT FOR WS 454 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

NEC009-015-017-041-071-089-103-113-115-149-171-183-180840-

NE 
.    NEBRASKA COUNTIES INCLUDED ARE

BLAINE		     BOYD		 BROWN		     
CUSTER		     GARFIELD		 HOLT		     
KEYA PAHA	     LOGAN		 LOUP		     
ROCK		     THOMAS		 WHEELER	     
$$


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$

STATUS REPORT #2 ON WW 454

VALID 180650Z - 180740Z

SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 WNW IML
TO 25 W VTN.

FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1196

..CARBIN..06/18/09

ATTN...WFO...BOU...LBF...CYS...

&&

STATUS REPORT FOR WS 454 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

NEC009-015-017-031-041-071-089-091-101-103-111-113-115-117-149-
171-183-180740-

NE 
.    NEBRASKA COUNTIES INCLUDED ARE

BLAINE		     BOYD		 BROWN		     
CHERRY		     CUSTER		 GARFIELD	     
HOLT		     HOOKER		 KEITH		     
KEYA PAHA	     LINCOLN		 LOGAN		     
LOUP		     MCPHERSON		 ROCK		     
THOMAS		     WHEELER		 
$$


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$

STATUS REPORT #1 ON WW 454

VALID 180425Z - 180540Z

THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.

..GARNER..06/18/09

ATTN...WFO...BOU...LBF...CYS...

&&

STATUS REPORT FOR WS 454 

SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS 

COC075-095-115-180540-

CO 
.    COLORADO COUNTIES INCLUDED ARE

LOGAN		     PHILLIPS		 SEDGWICK	     
$$


NEC005-009-015-017-031-033-041-049-069-071-075-089-091-101-103-
111-113-115-117-123-135-149-161-171-183-180540-

NE 
.    NEBRASKA COUNTIES INCLUDED ARE

ARTHUR		     BLAINE		 BOYD		     
BROWN		     CHERRY		 CHEYENNE	     
CUSTER		     DEUEL		 GARDEN 	     
GARFIELD	     GRANT		 HOLT		     
HOOKER		     KEITH		 KEYA PAHA	     
LINCOLN 	     LOGAN		 LOUP		     
MCPHERSON	     MORRILL		 PERKINS	     
ROCK		     SHERIDAN		 THOMAS 	     
WHEELER 	     
$$


THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY.  PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$

Please visit the National Weather Service Interactive Weather Information Network (IWIN) for more information on the warnings.

For each watch, probabilities for particular events inside the watch (listed above in each table) are determined by the issuing forecaster. The "Low" category contains probability values ranging from less than 2% to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities), "Moderate" from 30% to 60%, and "High" from 70% to greater than 95%. High values are bolded and lighter in color to provide awareness of an increased threat for a particular event.