Severe Thunderstorm Warning 288, NWS North Platte, NE

000 
WWUS53 KLBF 202009
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
209 PM MDT MON JUL 20 2009

NEC031-075-161-202045-
/O.CON.KLBF.SV.W.0288.000000T0000Z-090720T2045Z/
GRANT NE-SHERIDAN NE-CHERRY NE-
209 PM MDT MON JUL 20 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR SOUTHWESTERN CHERRY...EXTREME SOUTHEASTERN SHERIDAN AND
NORTHWESTERN GRANT COUNTIES...

AT 150 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL.  THIS STORM WAS LOCATED NEAR ASHBY...OR 37 MILES NORTH OF
ARTHUR...MOVING SOUTHWEST AT 5 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ASHBY BY 235 PM MDT...
  DOMINICK LAKE AND 6 MILES EAST OF BINGHAM BY 245 PM MDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

AT 202 PM MDT...HAIL UP TO ONE INCH IN DIAMETER WAS REPORTED 5 MILES 
NORTH NORTHEAST OF ASHBY WITH THIS STORM. IF YOU ARE IN THE PATH OF 
THE STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4221 10190 4212 10169 4186 10184 4195 10207
      4200 10206 4200 10209 4201 10210
TIME...MOT...LOC 2007Z 032DEG 6KT 4206 10190

$$

TLK

000 
WWUS53 KLBF 202022
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
322 PM CDT MON JUL 20 2009

NEC031-161-202030-
/O.CAN.KLBF.SV.W.0288.000000T0000Z-090720T2045Z/
SHERIDAN NE-CHERRY NE-
222 PM MDT MON JUL 20 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CHERRY AND
EXTREME SOUTHEASTERN SHERIDAN COUNTIES IS CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS MOVED OUT OF 
SOUTHWESTERN CHERRY COUNTY AND MOVING MORE SOUTH THAT WILL NOW NOT 
IMPACT EXTREME SOUTHEASTERN SHERIDAN COUNTY...WITH THE SEVERE 
THUNDERSTORM WARNING FOR SOUTHWESTERN CHERRY AND EXTREME 
SOUTHEASTERN SHERIDAN COUNTIES CANCELLED. ADDITIONAL STORM 
DEVELOPMENT IS POSSIBLE THIS AFTERNOON AND EVENING.

LAT...LON 4200 10202 4208 10197 4208 10171 4186 10184
      4195 10207 4200 10206
TIME...MOT...LOC 2020Z 007DEG 9KT 4199 10188

$$

NEC075-202045-
/O.CON.KLBF.SV.W.0288.000000T0000Z-090720T2045Z/
GRANT NE-
222 PM MDT MON JUL 20 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR NORTHWESTERN GRANT COUNTY...

AT 218 PM MDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS LOCATED NEAR ASHBY...OR
31 MILES NORTH OF ARTHUR...MOVING SOUTH AT 10 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES EAST OF DOMINICK LAKE BY 230 PM MDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

HAIL UP TO ONE INCH IN DIAMETER HAS BEEN REPORTED IN SIX MILES 
NORTHEAST OF ASHBY WITH THIS STORM. IF YOU ARE IN THE PATH OF THE 
STORM...TAKE IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4200 10202 4208 10197 4208 10171 4186 10184
      4195 10207 4200 10206
TIME...MOT...LOC 2020Z 007DEG 9KT 4199 10188

$$

TLK

000 
WWUS53 KLBF 202044
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
244 PM MDT MON JUL 20 2009

NEC075-202054-
/O.EXP.KLBF.SV.W.0288.000000T0000Z-090720T2045Z/
GRANT NE-
244 PM MDT MON JUL 20 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GRANT COUNTY WILL
EXPIRE AT 245 PM MDT...

THE STORM THAT PROMPTED THE WARNING HAS MOVED INTO SOUTHERN GRANT 
COUNTY THAT HAS ALLOWED THE SEVERE THUNDERSTORM WARNING FOR 
NORTHWESTERN GRANT COUNTY TO EXPIRE. ADDITIONAL STORM DEVELOPMENT IS 
POSSIBLE THIS EVENING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT
MONDAY EVENING FOR WESTERN NEBRASKA.

LAT...LON 4200 10202 4208 10197 4208 10171 4186 10184
      4195 10207 4200 10206
TIME...MOT...LOC 2044Z 007DEG 9KT 4193 10189

$$

TLK

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
400 AM CDT MON JUL 20 2009

.SYNOPSIS...
500 MB RIDGE CONTINUES OVER THE DESERT SOUTHWEST...HOWEVER TROF
MOVING ACROSS S CENTRAL CANADA HAS FLATTENED THE NORTHERN PART OF
THE RIDGE. AMPLIFIED TROF TO THE EAST...FROM THE GREAT LAKES
NEARLY TO THE GULF COAST. AT THE SURFACE...A LOW IS PUSHING ACROSS
CENTRAL CANADA WITH A TRAILING COLD FRONT ACROSS N DAKOTA AND JUST
PUSHING INTO NORTHERN WY. SEVERAL WEAK SLOWLY EASTWARD MOVING OR
STATIONARY BOUNDARIES ACROSS THE HIGH PLAINS.

&&

.DISCUSSION...
UPPER LEVEL SHORT WAVE PROVIDING THE NEEDED SUPPORT TO THE SURFACE
BOUNDARIES...SEEN IN H2O VAPOR IMAGERY...HELPING TO PRODUCE WIDELY
SCATTERED SHOWERS THIS MORNING ACROSS THE REGION. THESE SHOWERS
WILL CONTINUE IN A SOUTHEAST MOTION...HOWEVER ADDITIONAL DEVELOP
IN THE WAKE IS POSSIBLE. BETTER CHANCE WILL BE LATER THIS
AFTERNOON ALONG AND AHEAD OF COLD FRONT. CAPE VALUES REACHING NEAR
3K J/KG TO GO ALONG WITH STRONGLY SHEER ENVIRONMENT AS WINDS AHEAD
OF THE FRONT VEER FROM SOUTHEAST TO NORTHWEST. SUPERCELLS AND
LARGE HAIL TO BE A THREAT...AS OUTLOOKED IN SPC DY1 WITH HATCHED
AREA FOR HAIL. MAIN QUESTION WILL BE WHERE FRONT IS LOCATED WHEN
ACTIVITY BREAKS OUT...WHICH SHOULD BE EARLY AFTERNOON...IF NOT
SOON. MODELS DIFFER SLIGHTLY SO ONLY HAVE SVR WORDING IN MORE
CONFIDENT SOUTHEASTERN ZONES. WINDS BECOME NE BEHIND THE FRONT
AND PROVIDE A SLIGHT UPSLOPE TO CONTINUE THE THREAT FOR SHOWERS
BEHIND THE FRONT...HOWEVER NOT EXPECTING A SEVERE THREAT.

SURFACE HIGH BUILDS IN FOR TUESDAY AND WILL KEEP THINGS DRY AND
SEASONABLE COOL. HOWEVER BY TUESDAY NIGHT AS THE HIGH SLIDES TO
THE SE...UPSLOPING WILL AGAIN HAVE THE CHANCE TO FIRE SOME SHOWERS
OVER THE HIGHER TERRAIN TO THE WEST...THEN PUSH EAST ONTO THE
PLAINS...AS BEEN THE CASE MANY RECENT NIGHTS. WILL HAVE TO MONITOR
MID LEVEL SHORT WAVES IN NW FLOW...AS THIS WILL LIKELY BE NEEDED TO
PROVIDE ENOUGH CONVERGENCE.

ACTIVE PATTERN IS EXPECTED TO CONTINUE INTO THE WEEKEND...HOWEVER
LATEST RUN OF THE GFS REAMPLIFIES THE RIDGE TO THE WEST...WHICH
MAY DECREASE RAIN CHANCES AND BRING SOME WARMER TEMPS THAN GOING
FORECAST. NEW ECMWF DOES NOT HAVE THIS AMPLIFICATION. OTHERWISE
LIMITED CHANGES MADE BEYOND MIDWEEK.

&&

.AVIATION...
08Z-18Z THIS MORNING...ISOLATED THUNDERSTORMS WILL PRODUCE IFR
CONDITIONS ACROSS NCNTL NEB. STORM MOTION WILL BE EAST AND SOUTHEAST
AT 20 MPH.

18Z-03Z TODAY...A COLD FRONT WILL SETTLE ACROSS SWRN NEB THIS
AFTERNOON. THE FRONT IS EXPECTED TO ACT AS A FOCUS FOR ISOLATED TO
PERHAPS SCATTERED STRONG OR SEVERE THUNDERSTORMS. LARGE HAIL AND
WIND DAMAGE ARE THE MAIN CONCERN. THE FRONT IS EXPECTED TO STRETCH
NORTHEASTWARD ACROSS SWRN NEB THROUGH KBBW AND KONL WHERE
THUNDERSTORMS COULD ALSO FORM. THUS 21Z-03Z IS THE TIME FRAME
WHEREBY ISOLATED TO SCATTERED IFR CONDITIONS COULD DEVELOP ACROSS
THE AFOREMENTIONED AREA. ELSEWHERE VFR CONDITIONS ARE EXPECTED TO
PREVAIL. STORM MOTION CONTINUES AT EAST AND SOUTHEAST AT 20 MPH.

03Z ONWARD...THE FRONT SHOULD BE LOCATED ACROSS NRN KS THROUGH ERN
NEB. VFR CONDITIONS ARE EXPECTED ACROSS WRN AND NCNTL NEB.

&&

.LBF WATCHES/WARNINGS/ADVISORIES...NONE.

&&

SHORT TERM/EXTENDED...MASEK
AVIATION...CDC

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1103 AM CDT MON JUL 20 2009

NEZ004>010-022>029-035>038-056>059-069>071-094-211000-
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-
1103 AM CDT MON JUL 20 2009 /1003 AM MDT MON JUL 20 2009/

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

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING FOR ALL BUT THE EXTREME NORTHWEST. A WEAK COLD FRONT WILL
CONTINUE TO PUSH INTO NORTHWEST NEBRASKA THIS AFTERNOON...WHILE AN
AREA OF LOW PRESSURE EXTENDS SOUTH THROUGH WESTERN NEBRASKA. AMPLE
MOISTURE IS IN PLACE TO FUEL THUNDERSTORM DEVELOPMENT AS SEVERAL
DISTURBANCES CONTINUE TO MOVE SOUTHEAST WITH THE GREATEST
INSTABILITY TO EXIST IN AREAS SOUTHEAST OF A LINE FROM VALENTINE
IN CHERRY COUNTY...TO BIG SPRINGS IN DEUEL COUNTY LATE THIS
AFTERNOON. THE PRIMARY THREATS WILL BE LARGE HAIL AND DAMAGING
WINDS AS CONVECTION CONTINUES TO DEVELOP AS THESE BOUNDARIES PUSH
SOUTHEAST.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

WEDNESDAY THROUGH FRIDAY...HEAT...MOISTURE AND INSTABILITY WILL
RETURN. A STATIONARY FRONT WILL BE LOCATED SOMEWHERE ACROSS THE
CENTRAL PLAINS. THE FRONT AND ANY DISTURBANCE WHICH CROSSES THE
CENTRAL PLAINS COULD BE SUFFICIENT FOR THUNDERSTORM DEVELOPMENT.
WINDS ALOFT WILL CONTINUE TO BE STRONG SUPPORTIVE OF ISOLATED
SEVERE THUNDERSTORMS CAPABLE OF LARGE HAIL OR WIND DAMAGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT.

&&

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

KECK