Severe Thunderstorm Warning 389, NWS North Platte, NE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
235 PM CDT WED AUG 12 2009

.SYNOPSIS...
H5 RIDGE THROUGH THE NORTHERN PLAINS WITH AN H5 LOW MOVING INTO
THE PACIFIC NORTHWEST. AT THE SURFACE A TROUGH INTO THE NORTHERN PLAINS.

&&

.DISCUSSION...
MODELS IN FAIR AGREEMENT THIS AFTERNOON AND HAVE USED A BLEND FOR
THE FORECAST. A SUBTLE WAVE AS SEEN IN WV MOVING INTO SOUTHEAST
WYOMING NORTHEAST COLORADO EARLY THIS AFTERNOON PROVIDING ASCENT
ALONG THE TROUGH AXIS FROM NORTHEAST CO INTO WEST CENTRAL NEBRASKA
ISOLATED TRW. TDS IN THE LOW TO MID 60S EAST OF A LINE FROM
CHAPPELL TO CROOKSTON. CONVECTIVE TEMPERATURES ABOUT TO BE MET OR
EXCEEDED. WIND PROFILES ON THE SOUNDINGS NOT THAT IMPRESSIVE.
FREEZING LEVEL IS QUITE HIGH THIS AFTERNOON AROUND 15K FT. DRY AIR
INTRUSION AT MID LEVELS MIGHT PROVIDE IMPETUS FOR WIND EVENTS THIS
AFTERNOON INTO THIS EVENING. WILL MONITOR TRENDS THROUGH THE
REMAINDER OF THIS AFTERNOON. THURSDAY WILL BE SIMILAR TO TODAY
WITH TEMPERATURES INTO THE MID AND UPPER 90S. TROUGH REFORMS TO
THE WEST ANOTHER IN A SERIES OF MID AND UPPER LEVEL WAVES.
INSTABILITY SBCAPES IN THE 2K JOULES/KG BUT TDS ONLY IN THE 50S.
WILL CONTINUE MENTION OF ISOLATED. FRIDAY NIGHT WITH THE TROUGH TO
THE WEST AND STRONGER FORCING HAVE BUMPED POPS INTO CHANCE.

IN THE EXTENDED MODELS HAVE COME INTO BETTER AGREEMENT WITH FROPA
AND STALLING IT OUT ACROSS THE FORECAST AREA ON MONDAY TUESDAY.
MODELS NOW DRIVING FRONT INTO KANSAS SUNDAY NIGHT. HAVE BETTER
CONFIDENCE IN THIS FORECAST. HAVE UPPED POPS WITH THE FRONTAL
PASSAGE JUST BELOW LIKELY SATURDAY NIGHT INTO SUNDAY. MODELS AND
GUIDANCE QUITE BULLISH WITH QPF AND WITH PACIFIC MID LEVEL TAP
THETA E ADVECTION AHEAD OF THE SYSTEM COULD BE A GOOD RAINMAKER.
COOLER AIR BEHIND SYSTEM HAVE LOWERED TEMPERATURES INTO THE 80S
THROUGH THE END OF THE PERIOD.

&&

.AVIATION...

VFR CONDITIONS EXPECTED NEXT 24 HOURS.  HOWEVER ISOLATED TO
PERHAPS SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP BETWEEN 21Z
AND 06Z ALONG A LINE EAST OF HIGHWAY 83 NEARER HIGHWAY 183.
ISOLATED THUNDERSTORM ACTIVITY IS ALSO POSSIBLE ACROSS SOUTHWEST
NEBRASKA THIS EVENING...THIS ACTIVITY MAY NEAR KLBF.  ADDITIONAL
THUNDERSTORM ACTIVITY IS EXPECTED AGAIN THURSDAY AFTERNOON.

&&

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

SHORT TERM/EXTENDED...POWER
AVIATION...HIRSCH

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORTH PLATTE NE
326 PM CDT WED AUG 12 2009

NEZ004>010-022>029-035>038-056>059-069>071-094-132030-
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-
326 PM CDT WED AUG 12 2009 /226 PM MDT WED AUG 12 2009/

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

.DAY ONE...TONIGHT.
THUNDERSTORMS ARE EXPECTED AHEAD OF AN UPPER LEVEL DISTURBANCE
MOVING OUT OF COLORADO THIS EVENING. THUNDERSTORMS MAY FIRE ALONG
A BOUNDARY NEAR AND EAST OF HIGHWAY 183 AND ACROSS SOUTHWEST
NEBRASKA UNDER THE UPPER SYSTEM.  THUNDERSTORMS WILL BE CAPABLE OF
PRODUCING STRONG WINDS AND HEAVY RAINS...HAIL IS ALSO POSSIBLE
WITH THESE STORMS. THUNDERSTORMS WILL MOVE EAST OF THE AREA LATE
THIS EVENING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.
SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED
THURSDAY AND FRIDAY WITH THE POTENTIAL FOR MORE WIDESPREAD
THUNDERSTORM ACTIVITY THIS WEEKEND. SEVERE WEATHER ACTIVITY IS
EXPECTED TO BE LIMITED THROUGH THE PERIOD.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT.

&&

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

HIRSCH

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
510 PM CDT WED AUG 12 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0454 PM     HAIL             9 NW KEYSTONE           41.31N 101.71W
08/12/2009  M1.00 INCH       KEITH              NE   PUBLIC

            NICKEL TO QUARTER SIZE HAIL OCCURRED AT THIS LOCATION.

&&

CARMEL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
537 PM CDT WED AUG 12 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0532 PM     HAIL             11 WNW TRYON            41.62N 101.14W
08/12/2009  E1.00 INCH       MCPHERSON          NE   PUBLIC

            BRIEF HEAVY RAIN ALSO OCCURRED AT THIS LOCATION AT TIME
            OF REPORT.

&&

CARMEL

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