Frost Advisory 1, NWS North Platte, NE

446 
WWUS73 KLBF 081300
NPWLBF

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE NORTH PLATTE NE
800 AM CDT TUE MAY 8 2012


NEZ004-081400-
/O.EXP.KLBF.FZ.W.0001.000000T0000Z-120508T1300Z/
SHERIDAN-
INCLUDING THE CITIES OF...GORDON...RUSHVILLE
700 AM MDT TUE MAY 8 2012

...FREEZE WARNING WILL EXPIRE AT 7 AM MDT THIS MORNING...

THE FREEZE WARNING WILL EXPIRE AT 7 AM MDT THIS MORNING. 

TEMPERATURES HAVE RISEN ABOVE FREEZING. THEREFORE THE FREEZE
WARNING FOR SHERIDAN COUNTY HAS BEEN ALLOWED TO EXPIRE. 

$$

NEZ005-022>025-035>037-056-057-059-094-081400-
/O.EXP.KLBF.FR.Y.0001.000000T0000Z-120508T1300Z/
EASTERN CHERRY-GARDEN-GRANT-HOOKER-THOMAS-ARTHUR-MCPHERSON-LOGAN-
DEUEL-KEITH-LINCOLN-WESTERN CHERRY-
INCLUDING THE CITIES OF...VALENTINE...OSHKOSH...HYANNIS...
MULLEN...THEDFORD...ARTHUR...TRYON...STAPLETON...CHAPPELL...
BIG SPRINGS...OGALLALA...NORTH PLATTE...CODY...MERRIMAN...KILGORE
800 AM CDT TUE MAY 8 2012 /700 AM MDT TUE MAY 8 2012/

...FROST ADVISORY WILL EXPIRE AT 8 AM CDT /7 AM MDT/ THIS
MORNING...

THE FROST ADVISORY WILL EXPIRE AT 8 AM CDT /7 AM MDT/ THIS
MORNING. 

TEMPERATURES HAVE RISEN INTO THE UPPER 30S TO AROUND 40. THEREFORE
THE FROST ADVISORY HAS BEEN ALLOWED TO EXPIRE. 

$$

KAR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1247 PM CDT MON MAY 7 2012

.AVIATION...

VFR IS EXPECTED ALL AREAS THROUGH REMAINDER OF 18Z TAFS.

A WEAK DISTURBANCE CURRENTLY SITUATED OVER THE COLORADO ROCKIES
WILL CONTINUE TO INFLUENCE WESTERN AND CENTRAL NEBRASKA TODAY AS MID
AND HIGH LEVEL CLOUDS STREAM OVER THE REGION. A FEW ISOLATED RAIN
SHOWERS WILL BE POSSIBLE ACROSS SOUTHWEST NEBRASKA...BUT THESE ARE
EXPECTED TO REMAIN CLEAR OF THE LBF TERMINAL. OTHERWISE EXPECT CLOUD
DECKS THIS AFTERNOON TO REMAIN ABOVE 12000 FEET AT LBF...25000 FEET
AT VTN. IT IS POSSIBLE A FEW 7000-9000 FOOT CIGS BRIEFLY CLIP LBF
THROUGH 21Z...BUT HELD BACK ON INTRODUCING THESE AS THEY ARE
EXPECTED TO PUSH JUST SOUTH OF LBF. NORTHWEST WINDS WILL DECREASE BY
23-00Z AT BOTH TERMINALS...WITH WINDS BECOMING VARIABLE AT LBF AS
WINDS DECOUPLE OVERNIGHT. SKIES WILL CLEAR OUT OVERNIGHT WITH
NORTHWEST WINDS INCREASING 14-15Z TOMORROW.
&&

PREV DISCUSSION... /ISSUED 400 AM CDT MON MAY 7 2012/

SYNOPSIS...
BROAD UPPER LEVEL RIDGE THIS MORNING OVER THE SE CONUS. WHILE A
TROUGH IS PUSHING ACROSS THE NORTHERN PLAINS. A SECOND WEAK LOW
DIGGING TOWARDS THE FOUR CORNERS. AT THE SURFACE HIGH PRESSURE IS
BUILDING SE ACROSS THE NORTHERN ROCKIES. WEAK UPSLOPE FLOW OVER
THE FRONT RANGE OF CO AND WY COMBINING WITH SOME WEAK MID LEVEL
FORCING TO PRODUCE SOME ISOLD SHOWERS. THE SHOWERS ARE DRIFTING
TO THE NORTHEAST...OVER THE CWA...HOWEVER DRY BOUNDARY LAYER
RESULTING IN LITTLE IF ANY OF THE PRECIP MAKING IT TO THE GROUND.
08Z TEMPS STILL MILD BENEATH THE MID CLOUD DECK...IN THE UPPER
40S AND LOW 50S...HOWEVER PORTIONS OF N SHERIDAN HAVE CLEARED OUT
WITH TEMPS DIPPING CLOSE TO 40.

DISCUSSION...
LIGHT SHOWERS OR SPRINKLES CONTINUE TO BE POSSIBLE THIS MORNING
AS WEAK UP SLOPE FLOW COMBINES WITH A MID LEVEL
DISTURBANCE...SEEN ON WATER VAPOR IMAGERY...HOWEVER BL FAIRLY DRY
AND CIG BASES ABOVE 6000 FT AGL. MODELS CONTINUE TO FAVOR CO WITH
SHOWER DEVELOPMENT INTO THE AFTERNOON AND EVENING HOURS.
CONTINUED SHOWER/SPRINKLE MENTION INTO THE AFTERNOON...HOWEVER
SURF HIGH IS EXPECTED TO BUILD TOWARDS THE AREA WHICH SHOULD
BRING ENOUGH SUBSIDENCE TO END ANY THREAT OF THE LIGHT PRECIP BY
EVENING.

FOCUS SHIFTS TO TEMPS AS DRY AIR...WITH DEW POINTS AROUND 30 IN
THE NW...WITH LOWER TO MID 30S ELSEWHERE. HIGH WILL ALSO BRING
LIGHT WINDS AND CLEARING SKIES...SETTING THE STAGE FOR TEMPS TO
DROP INTO THE 30S ACROSS MUCH OF THE CWA. FAVORED COLD SPOTS OF
THE NORTHWEST AND RVR VALLEYS LIKELY TO SEE SOME FROST. THE NW
COULD EVEN FREEZE. EXPECT A FROST AND/OR FREEZE HEADLINE TO BE
ISSUED LATER TODAY. RECORD LOWS ARE STILL IN THE LOWER TO MID
20S...AND CLIMATOLOGY FOR A FREEZE IS AROUND THE 50 PERCENTILE.

TOMORROW WILL SEE TEMPS REBOUND A LITTLE AS MORE MAY SUN IS
EXPECTED. COOLEST IN THE FAR NE AS A SYSTEM TRACKS TO THE NE AND
COULD SEE A FEW CLOUDS WRAP ACROSS N CENTRAL NEB.

ANOTHER COOL NIGHT POSSIBLE FOR TOMORROW NIGHT...AND WILL LOOK TO
SEE HOW COLD WE GET TONIGHT...BUT SURF HIGH STILL IN THE AREA AND
LITTLE CLOUD COVER. HAVE FOLLOWED CLOSE TO GUIDANCE FOR NOW...BUT
COULD EASILY SEE ANOTHER FROSTY MORNING.

BY WEDNESDAY INTO THURSDAY HIGH SHIFTS TO THE SOUTHEAST AND
RETURN SOUTHERN WARM FLOW EXPECTED AS WEAK RIDGING BUILDS AHEAD
OF THE NEXT COLD FRONT. HIGHS ON WED INTO THE 70S WITH AROUND 80
FOR THURSDAY. THEN A COLD FRONT MOVES ACROSS THE AREA THURSDAY
NIGHT. MOISTURE REMAINS FOR THE MOST PART LIMITED...AND CONTINUED
CHANCE POPS. FRONT STALLS JUST TO THE SOUTH AND COULD SEE SOME
LINGERING SHOWERS FOR FRIDAY...MAYBE A THUNDERSTORM ACROSS THE
SOUTHERN ZONES. THE WEEKEND INITIALLY LOOKED DRY AS HIGH PRESSURE
SETTLES OVER THE NORTHERN/CENTRAL PLAINS...HOWEVER THE FRONT
LIKELY TO BE JUST SOUTH OF THE CWA. WILL HAVE TO MONITOR THE
HANDLING OF THE FRONT AND LL MOISTURE...WITH THE POTENTIAL FOR
NEEDING TO ADD SHOWERS ACROSS THE SOUTH FOR PART OF THE WEEKEND.

&&

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

SHORT TERM/EXTENDED...MASEK
AVIATION...AHSENMACHER/JACOBS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1005 AM CDT MON MAY 7 2012

NEZ004>010-022>029-035>038-056>059-069>071-094-081515-
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-
1005 AM CDT MON MAY 7 2012 /905 AM MDT MON MAY 7 2012/

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

.DAY ONE...TONIGHT.

A COOLER AND DRIER AIR MASS WILL SETTLE ACROSS WESTERN NEBRASKA
THROUGH THE OVERNIGHT. AS A RESULT...TEMPERATURES ARE FORECAST TO
DIP INTO THE LOW TO MID 30S OVER PARTS OF THE WESTERN SANDHILLS
AND OVER FAVORED COLD DRAINAGE AREAS SUCH AS THE NORTH AND SOUTH
PLATTE RIVER VALLEYS. AREAS OF FROST COULD DEVELOP AND MAY BE OF A
CONCERN TO YOUNG AND DELICATE VEGETATION LATE TONIGHT.

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

FROST MAY BE OF A CONCERN EARLY WEDNESDAY MORNING ACROSS
NORTHWESTERN AND NORTH CENTRAL NEBRASKA AS HIGH PRESSURE...LIGHT
WIND SPEEDS AND CLEAR SKIES ALLOW FOR STRONG RADIATIONAL COOLING.
AS OF NOW...LOW TEMPERATURES ARE FORECAST TO FALL INTO THE MID TO
UPPER 30S FOR AREAS ALONG AND NORTH OF A ANTIOCH TO O'NEILL LINE.

A FEW THUNDERSTORMS ARE POSSIBLE MAINLY THURSDAY NIGHT AND
FRIDAY...BUT THE RISK FOR STRONG STORMS APPEARS LOW.

.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

JACOBS