Severe Thunderstorm Warning 362, NWS North Platte, NE

000 
WWUS53 KLBF 050410
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1010 PM MDT TUE AUG 4 2009

NEC031-161-050445-
/O.CON.KLBF.SV.W.0362.000000T0000Z-090805T0445Z/
SHERIDAN NE-CHERRY NE-
1010 PM MDT TUE AUG 4 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM MDT
FOR NORTHWESTERN CHERRY AND SHERIDAN COUNTIES...

AT 1009 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM 15 MILES NORTH OF ELI TO 10 
MILES NORTHWEST OF HIGHWAY 87 MILE MARKER 30...MOVING SOUTHEAST AT 
40 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  HIGHWAY 20 MILE MARKER 110 BY 1015 PM MDT...
  INTERSECTION OF HIGHWAY 27 AND MILLS ROAD AND MERRIMAN BY 1020 PM
  MDT...
  HIGHWAY 250 CROSSING THE NIOBRARA RIVER...INTERSECTION OF HIGHWAY
  20 AND IRWIN ROAD AND HIGHWAY 87 MILE MARKER 30 BY 1025 PM MDT...
  HIGHWAY 27 CROSSING THE NIOBRARA RIVER...ROCK HILL AND ELI BY 1030
  PM MDT...
  HIGHWAY 61 CROSSING THE NIOBRARA RIVER BY 1035 PM MDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT
TUESDAY EVENING FOR CENTRAL NEBRASKA. A SEVERE THUNDERSTORM WATCH
ALSO REMAINS IN EFFECT UNTIL 400 AM MDT WEDNESDAY MORNING FOR WESTERN
NEBRASKA.

&&

LAT...LON 4299 10093 4216 10275 4294 10280 4298 10273
      4300 10266
TIME...MOT...LOC 0410Z 295DEG 33KT 4315 10138 4255 10284

$$

CDC

000 
WWUS53 KLBF 050441
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1041 PM MDT TUE AUG 4 2009

NEC031-161-050450-
/O.EXP.KLBF.SV.W.0362.000000T0000Z-090805T0445Z/
SHERIDAN NE-CHERRY NE-
1041 PM MDT TUE AUG 4 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CHERRY AND
SHERIDAN COUNTIES WILL EXPIRE AT 1045 PM MDT...

SEVERE WEATHER HAS EXITED MUCH OF THE WARNED AREA. A NEW WARNING HAS 
BEEN ISSUED FOR THE REMAINING SEVERE THUNDERSTORMS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT
TUESDAY EVENING FOR CENTRAL NEBRASKA. A SEVERE THUNDERSTORM WATCH
ALSO REMAINS IN EFFECT UNTIL 400 AM MDT WEDNESDAY MORNING FOR WESTERN
NEBRASKA.

LAT...LON 4299 10093 4216 10275 4294 10280 4298 10273
      4300 10266
TIME...MOT...LOC 0440Z 295DEG 33KT 4303 10104 4243 10250

$$

CDC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
325 PM CDT TUE AUG 4 2009

.SYNOPSIS...
CURRENT H5 ANALYSIS INDICATING LOW PRESSURE OVER THE SRN HUDSON
BAY...A WELL ESTABLISHED BERMUDA HIGH...HIGH PRESSURE OVER CENTRAL
NM AND A TROUGH OF LOW PRESSURE OFF THE COAST OF CALIFORNIA. THREE
MAJOR DISTURBANCES WERE NOTED...ONE OVER WRN ID...A SECOND OVER NRN
MO AND A THIRD OVER SRN ALBERTA. THE WRN IDAHO DISTURBANCE HAS MADE
IT TO NWRN WYOMING THIS AFTERNOON...PER WV IMAGERY. THIS
DISTURBANCE WILL BE THE TRIGGER FOR TSRA DEVELOPMENT ACROSS THE FCST
AREA LATER TONIGHT. LOW LEVEL SERLY WINDS HAVE DEVELOPED ACROSS THE
PANHANDLE THIS AFTERNOON AS HIGH PRESSURE BUILDS EAST ACROSS SOUTH
DAKOTA. THIS HAS ALLOWED MOISTURE TO BUILD INTO THE PANHANDLE THIS
AFTERNOON WITH DEW POINTS WELL INTO THE 50S.

&&

.DISCUSSION...

NEAR TERM...TONIGHT THROUGH FRIDAY...THROUGH THURSDAY
NIGHT...FAVORABLE CONDITIONS REMAIN IN PLACE FOR THUNDERSTORM
COMPLEXES IMPACTING THE FORECAST AREA EVERY 18 TO 24 HOURS. FOR
TONIGHT...UPSTREAM DISTURBANCE...OVER CODY WYOMING ATTM...WILL TRACK
TO THE EAST SOUTHEAST INTO ERN WYOMING THROUGH 00Z TONIGHT. AS THIS
FEATURE ENTERS THE HIGH PLAINS OF WYOMING...ISOLATED TSRAS WILL
BECOME BETTER ORGANIZED AS THEY TAP INTO MID 50 DEW POINTS OVER THE
WRN PANHANDLE. THIS ACTIVITY WILL BEGIN TO IMPACT THE NORTHWESTERN
CWA BY 03Z AND CONTINUE INTO THE OVERNIGHT HOURS THANKS TO AN
ESTABLISHED LLJ FOCUSED OVER THE WESTERN FA OVERNIGHT. LARGE HAIL
AND WINDS WILL BE THE MAIN THREATS. EVEN WITH THE DECENT 0-2KM
HELICITIES ACROSS THE NWRN CWA...FEEL TORNADO THREAT WILL BE
MITIGATED SOMEWHAT BY THE LATE EVENING AND OVERNIGHT TIMING.

ANOTHER STRONG DISTURBANCE WILL LIFT EWD ALONG THE NRN PERIPHERY OF
THE UPPER LEVEL HIGH (LOCATED OVER NRN NM)...EMERGING ONTO THE HIGH
PLAINS OF WRN SD/ERN WYOMING/NEBR PANHANDLE DURING THE EVENING HOURS
WEDNESDAY. TIMING OF THIS EVENT FOR TOMORROW EVENING IS SIMILAR TO
TONIGHTS...SO ANOTHER LATE SHOW IS EXPECTED.

ON THURSDAY...THE UPPER LEVEL HIGH WILL BUILD EAST INTO THE RED
RIVER VALLEY OF TX. ANOTHER ROUND OF LATE DAY CONVECTION IS EXPECTED
TO DEVELOP THURSDAY EVENING ACROSS THE WEST. WITH THE STEERING FLOW
TRANSITIONING TO THE SOUTHWEST...AREAS ACROSS THE WEST AND NORTHWEST
WILL BE MOST FAVORED FOR THUNDERSTORMS THURSDAY NIGHT.

LONG TERM...FRIDAY NIGHT THROUGH TUESDAY...MAIN FORECASTING
CHALLENGES IN THE OUTER PERIODS DEAL WITH TEMPERATURES AND LOW
PRECIPITATION CHANCES FOR THE WEEKEND. SOME MINOR DIFFERENCES IN THE
H5 FLOW NOTED BETWEEN THE EURO AND GFS SOLUTIONS FOR THIS
WEEKEND...WHICH INCREASE SIGNIFICANTLY EARLY NEXT WEEK. FOR THE
WEEKEND...THERMAL RIDGING WILL START TO BREAK DOWN OVERNIGHT
FRIDAY...AS A SIGNIFICANT DISTURBANCE LIFTS NNEWD INTO THE NRN
ROCKIES OF WRN MT. THOUGH THE BULK OF BEST FORCING APPEARS TO BE
WELL NORTHWEST OF THE AREA FRIDAY NIGHT...CANNOT RULE OUT SOME STRAY
CONVECTION ACROSS THE NORTHWEST AND WILL CONTINUE SOME 20 POPS TO
ACCOUNT FOR THIS. ON SATURDAY...THE BEFORE MENTIONED DISTURBANCE WILL
TRACK EAST INTO THE DAKOTAS...FORCING A FRONT INTO THE AREA SATURDAY
AFTERNOON. WILL NEED TO WATCH THE TIMING OF THIS IN FUTURE RUNS. IF
THIS SLOWS FURTHER...AND BASED ON RELATIVELY LOW DEW POINTS IN THE
WEST...COULD SEE A REAL TORCH OUT FOR SATURDAY.

SUNDAY AND BEYOND...TEMPERATURES WILL COOL DECENTLY BEHIND THE FRONT
FOR SUNDAY AND MONDAY...BEFORE READINGS REBOUND ON TUESDAY.
GENERALLY FOLLOWED THE LOWER AMPLITUDE 12Z GFS SOLN FROM THIS
MORNING FOR DAY 7 VS THE HIGHER AMPLITUDE EURO SOLN. THIS SOLN IS
MORE IN LINE WITH THE ENSEMBLE FORECASTS AND EURO ENSEMBLE FCST FROM
LAST NIGHT...WHICH IS FOR A DECREASED AMPLITUDE SOLN AS WELL. WITH A
LOWER AMPLITUDE SOLN AND A WEAKER HUDSON LOW...WARMER AIR SHOULD
BUILD BACK INTO THE CENTRAL PLAINS FOR DAY 7 WITH READINGS BACK IN
THE MID 90S FROM AROUND 90 ON SUNDAY AND MONDAY.

&&

.AVIATION...

VFR SKIES THIS EVENING AND MOST OF THE OVERNIGHT CAN BE EXPECTED.
ANOTHER SHORT WAVE WILL MOVE ACROSS THE AREA TONIGHT PRODUCING A
THUNDERSTORM COMPLEX...CAPABLE OF STRONG WINDS AND LARGE HAIL. AS
THE THUNDERSTORMS MOVE SOUTHEAST ACROSS THE STATE...BRIEF PERIODS OF
REDUCED VSBY TO IFR ARE LIKELY AND POSSIBLY TO MVFR CIGS. TIMING THE
WAVE WILL BE DIFFICULT AND WHILE I HAVE TIMED INTO KVTN FOR 2
HOURS...IT MAY BE LONG. EXPECT AND UPDATE FOR KLBF ONCE THUNDERSTORM
LOCATIONS/TIMING CONFIDENCE INCREASES. IN THE WAKE OF THE
COMPLEX...SOME MVFR STRATUS OR FOG WILL BE POSSIBLE. LOW CONFIDENCE
OF IMPACT TO TERMINAL SITES WILL KEEP IT OUT OF THE FORECAST FOR
NOW. TOMORROW SKIES BECOME CLEAR JUST IN TIME FOR ANOTHER ROUND WITH
THE NEXT SHORT WAVE.

&&

.LBF WATCHES/WARNINGS/ADVISORIES...NONE

.AVIATION...MASEK
.SHORT AND LONG TERM...BUTTLER

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORTH PLATTE NE
402 PM CDT TUE AUG 4 2009

NEZ004>010-022>029-035>038-056>059-069>071-094-052115-
SHERIDAN-EASTERN CHERRY-KEYA PAHA-BOYD-BROWN-ROCK-HOLT-GARDEN-
GRANT-HOOKER-THOMAS-BLAINE-LOUP-GARFIELD-WHEELER-ARTHUR-MCPHERSON-
LOGAN-CUSTER-DEUEL-KEITH-PERKINS-LINCOLN-CHASE-HAYES-FRONTIER-
WESTERN CHERRY-
402 PM CDT TUE AUG 4 2009 /302 PM MDT TUE AUG 4 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN AND
NORTH CENTRAL NEBRASKA.

.DAY ONE...TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORM DEVELOPMENT OVER
ALL OF WESTERN AND NORTH CENTRAL NEBRASKA TONIGHT. A STALLED OUT
FRONTAL BOUNDARY OVER THE NEBRASKA PANHANDLE WILL BE THE FOCUS FOR
THUNDERSTORM DEVELOPMENT THIS EVENING AS DAYTIME HEATING
DESTABILIZES THE ATMOSPHERE AND AN UPPER LEVEL DISTURBANCE MOVES
INTO THE REGION. THUNDERSTORMS WILL THEN MOVE TO THE SOUTHEAST OVER
WESTERN AND NORTH CENTRAL NEBRASKA TONIGHT. THE MAIN THREAT WITH
THUNDERSTORMS THAT DEVELOP WILL BE VERY LARGE HAIL AND DAMAGING
WINDS...HOWEVER...EARLY TONIGHT ISOLATED TORNADOES WILL BE
POSSIBLE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORM DEVELOPMENT AGAIN
OVER WESTERN AND NORTH CENTRAL NEBRASKA ON WEDNESDAY AND THURSDAY
AFTERNOON AND EVENING ALONG A STATIONARY BOUNDARY AS WEAK WAVES
MOVE THROUGH NORTHWEST FLOW. THE MAIN THREAT AREA IS ALONG AND
NORTH OF INTERSTATE 80 NORTH TO THE SOUTH DAKOTA BORDER. THE MAIN
THREAT WITH THUNDERSTORMS THAT DEVELOP WILL BE LARGE HAIL AND
DAMAGING WINDS.

NORTHWEST FLOW ALOFT WILL KEEP WEAK WAVES MOVING ACROSS WESTERN
AND NORTH CENTRAL NEBRASKA THROUGH THE WEEK. ISOLATED TO
SCATTERED THUNDERSTORMS WILL AFFECT MAINLY NORTHERN NEBRASKA. NO
WIDESPREAD SEVERE WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT.

&&

THIS PRODUCT IS NOW AVAILABLE...ALONG WITH OTHER WEATHER...
HYDROLOGICAL AND CLIMATOLOGICAL INFORMATION...AT
HTTP://WWW.WEATHER.GOV/NORTHPLATTE

MASEK