Severe Thunderstorm Warning 447, NWS North Platte, NE

000 
WWUS53 KLBF 232336
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
636 PM CDT SUN SEP 23 2007

NEC069-232346-
/O.CAN.KLBF.SV.W.0447.000000T0000Z-070924T0000Z/
GARDEN NE-
536 PM MDT SUN SEP 23 2007

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GARDEN COUNTY IS
CANCELLED...

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

LAT...LON 4163 10199 4173 10198 4173 10200 4200 10204
      4201 10203 4201 10197 4208 10198 4207 10144
      4158 10145 4153 10197
TIME...MOT...LOC 2336Z 269DEG 28KT 4209 10198 4190 10178
          4163 10181

$$

NEC005-075-240000-
/O.CON.KLBF.SV.W.0447.000000T0000Z-070924T0000Z/
ARTHUR NE-GRANT NE-
536 PM MDT SUN SEP 23 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR GRANT AND NORTHERN ARTHUR COUNTIES...

AT 535 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY
SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM ASHBY TO HIGHWAY 61 MILE
MARKER 150 TO JENSEN LAKE...OR ALONG A LINE EXTENDING FROM 39 MILES
NORTHWEST OF ARTHUR TO 23 MILES NORTH OF ARTHUR TO 8 MILES NORTHWEST
OF ARTHUR...MOVING EAST AT 30 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  HIGHWAY 61 MILE MARKER 140 BY 540 PM MDT...
  HIGHWAY 61 MILE MARKER 130 AND ARTHUR BY 545 PM MDT...
  PRATT LAKE...SPRING VALLEY LAKE...SAND PUDDIN LAKE AND HYANNIS BY
  550 PM MDT...
  GREEN LAKE AND HIGHWAY 92 MILE MARKER 170 BY 555 PM MDT...
  THREE MILE LAKE BY 600 PM MDT...

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

LAT...LON 4163 10199 4173 10198 4173 10200 4200 10204
      4201 10203 4201 10197 4208 10198 4207 10144
      4158 10145 4153 10197
TIME...MOT...LOC 2336Z 269DEG 28KT 4209 10198 4190 10178
          4163 10181

$$

SPRINGER

000 
WWUS53 KLBF 232353
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
653 PM CDT SUN SEP 23 2007

NEC005-075-240003-
/O.EXP.KLBF.SV.W.0447.000000T0000Z-070924T0000Z/
ARTHUR NE-GRANT NE-
553 PM MDT SUN SEP 23 2007

...THE SEVERE THUNDERSTORM WARNING FOR GRANT AND NORTHERN ARTHUR
COUNTIES EXPIRES AT 600 PM MDT...

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

LAT...LON 4163 10199 4173 10198 4173 10200 4200 10204
      4201 10203 4201 10197 4208 10198 4207 10144
      4158 10145 4153 10197
TIME...MOT...LOC 2353Z 269DEG 28KT 4209 10180 4190 10160
          4163 10164

$$

SPRINGER

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
240 PM CDT SUN SEP 23 2007

.SYNOPSIS...
    HAND ANALYSIS OF THE SURFACE DATA SHOWED A FRONT ACROSS WESTERN
SOUTH DAKOTA AND THE WESTERN NEBRASKA PANHANDLE. THERE WERE ALSO
SURFACE LOWS CENTERED OVER CENTRAL NORTH DAKOTA...SOUTHEAST MONTANA
AND OVER THE SOUTHWEST NEBRASKA PANHANDLE. THERE WAS ANOTHER FRONT
ACROSS NORTH DAKOTA AND SOUTHERN MONTANA. CUMULUS CLOUDS IN THE
VISIBLE IMAGERY INDICATED SOME INSTABILITY EXTENDING INTO SOUTHWEST
NEBRASKA...AND RADAR MOSAIC SHOWED A LINE OF ECHOES ALONG THE
NEBRASKA-WYOMING BORDER. SATELLITE DERIVED PRECIPITABLE WATER SHOWED
25-35MM OVER NORTH CENTRAL THROUGH SOUTHWEST NEBRASKA. IN THE UPPER
LEVELS...6.7U IMAGERY INDICATED A VORTICITY MAX ABOUT NORTHERN UTAH.
THE WIND PROFILE NETWORK SHOWED SOUTHERLY FLOW OVER THE HIGH PLAINS.
&&

.SHORT TERM...TONIGHT THROUGH TUESDAY.
    IT APPEARS THAT PRECIPITATION WILL BE IN TWO SURGES OVER WESTERN
AND NORTH CENTRAL NEBRASKA.
    TONIGHT...STRONG CONVERGENCE ALONG THE SURFACE TROUGH WITH
ENHANCED FORCING FROM THE UPPER LEVEL VORTICITY MAXIMUM SHOULD HAVE
NO PROBLEM CREATING SUFFICIENT LIFT FOR SCATTERED TO NUMEROUS
THUNDERSTORMS. WITH STRONG ELEVATED INSTABILITY AND FAVORABLE LOW
LEVEL WIND PROFILES THERE IS A POSSIBILITY OF SUPER CELL
DEVELOPMENT. WITH PRECIPITABLE WATER RUNNING AN INCH TO AN INCH AND
A HALF...THERE IS PLENTY OF MOISTURE AVAILABLE FOR HEAVY RAIN. THE
SURFACE FRONT DOES NOT OVERTAKE THE SLOW MOVING TROUGH UNTIL AFTER
06Z...SO SOME RAINFALL AMOUNTS MAY EXCEED AN INCH.
    THE SECOND SURGE WILL BE ALONG AND BEHIND THE COLD FRONT AS THE
UPPER TROUGH CROSSES NEBRASKA. AT THIS TIME...IT APPEARS THAT THE
BEST CHANCES OF SIGNIFICANT PRECIPITATION WILL BE IN THE PERIOD FROM
MONDAY AFTERNOON THROUGH MONDAY NIGHT.
    WIND WAS BEGINNING TO REACH ADVISORY CRITERIA WITH THE 19Z
OBSERVATIONS...SO CURRENT THINKING IS TO KEEP THE WIND ADVISORY IN
EFFECT UNTIL IT EXPIRES AT 01Z. THE PRESSURE GRADIENT SHOULD RELAX A
LITTLE AS THE TROUGH AND FRONT COME ACROSS...SO THE 01Z EXPIRATION
STILL LOOKS GOOD.
&&

.LONG TERM...TUESDAY NIGHT THROUGH SUNDAY.
    DRY WEATHER IS THEN EXPECTED THROUGH AT LEAST THURSDAY WITH
WARMING TEMPERATURES. BY EARLY FRIDAY...RETURN FLOW BEGINS BRINGING
LOW LEVEL MOISTURE AGAIN TO THE HIGH PLAINS AND CONTINUES THROUGH
FRIDAY AFTERNOON. THEN ANOTHER FRONT IS EXPECTED...ONCE AGAIN
GIVING A CHANCE OF THUNDERSTORMS TO WESTERN AND NORTH CENTRAL
NEBRASKA SATURDAY.
&&

.AVIATION...
    COMPLEX WEATHER FOR PILOTS THE NEXT 24 HOURS AS STRONG COLD
FRONT PUSHES ACROSS THE AREA. AHEAD OF THE FRONT GUSTY S TO SW WINDS
WITH LOCALLY GUSTS APPROACHING 40KTS. THEN AS COLD FRONT MOVES FROM
EASTERN WY THIS AFTERNOON ACROSS THE HIGH PLAINS OVERNIGHT...STRONG
TO SEVERE THUNDERSTORMS ARE POSSIBLE. GENERALLY VFR CONDITIONS
OUTSIDE OF THUNDERSTORMS TONIGHT...HOWEVER MVFR AND BRIEF IFR
CONDITIONS ARE POSSIBLE IN AND NEAR THUNDERSTORMS. ALSO WIND GUSTS
ASSOCIATED WITH THE THUNDERSTORMS ARE LIKELY TO BE GUSTING AT TIMES
NEAR 40 TO EVEN 50 KTS. BEHIND THE FRONT WINDS CONTINUE ON THE HIGH
SIDE WITH N TO NW WINDS OF 20 TO 30 KTS.
&&

.LBF WATCHES/WARNINGS/ADVISORIES...
NEZ005>010-025>029-036>038-057>059-069>071
WIND ADVISORY UNTIL 01Z.
&&

SPRINGER/MASEK

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORTH PLATTE NE
351 PM CDT SUN SEP 23 2007

NEZ004>010-022>029-035>038-056>059-069>071-094-242100-
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-
351 PM CDT SUN SEP 23 2007 /251 PM MDT SUN SEP 23 2007/

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

.DAY ONE...TONIGHT.

COLD FRONT WILL MOVE ACROSS THE AREA TONIGHT WITH SOUTH WINDS
GUSTING TO 45 MPH AHEAD OF THE FRONT. ALONG THE FRONT STRONG TO
SEVERE THUNDERSTORMS ARE POSSIBLE WITH HAIL AND DAMAGING WINDS THE
MAIN THREAT. NORTHWEST WINDS WILL DEVELOP BEHIND THE
FRONT...HOWEVER ONLY GUSTING TO 30 MPH. SEE ONGOING
WATCHES...WARNINGS AND ADVISORIES FOR MORE INFORMATION.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

LINGER SHOWERS WITH A FEW EMBEDDED NON SEVERE THUNDERSTORMS WILL
CONTINUE MONDAY ACROSS CENTRAL NEBRASKA. THERE IS A SLIGHT CHANCE
FOR THUNDERSTORMS FRIDAY NIGHT INTO SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING.

&&

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

MASEK