Severe Thunderstorm Warning 291, NWS Omaha, NE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
235 PM CDT MON AUG 19 2002

MAIN FORECAST CONCERN IS POTENTIAL FOR SEVERE WEATHER WITH TSTMS
LATE TNGT IN THE SRN ZONES...SPREADING NORTH THROUGH THE AREA ON
TUE.  SFC ANLYS EARLY THIS AFTN SHOWED FNT STALLED OVER KS AND
MO...WITH DEWPOINTS IN THE 70S TO THE S OF BOUNDARY.  HIGH PRES
RIDGE WILL MOVE EWD...AND PRESSURES WILL FALL OVER THE WRN HIGH
PLAINS...HELPING LIFT FNT NWD.  ISENTROPIC LIFT SHOULD BE STRONG
ENOUGH TO GENERATE PCPN AT LEAST IN SERN NE.  HAVE HIGHEST POPS
...40 PERCENT...ALONG KS BORDER.  EXPECT LOWS TNGT TO VERY FROM
MID 50S NRN ZONES TO LOWER AND MID 60S IN THE S.  TEMPS SHOULD
BE RISING LATE TNGT WITH CLOUDS INCREASING.

ON TUE...BUMPED UP POPS TO LIKELY IN SERN HALF OF AREA AND TO
50 PERCENT IN THE N.  SHEAR STRONG ENOUGH TO SUPPORT SUPERCELLS
IF BASES ARE LOW ENOUGH.  STORMS IN THE MORNING LIKELY TO BE
ELEVATED...WITH HAIL THE MAIN THREAT.  WARMER AIR WILL TRY TO
WORK ITS WAY IN...ESPECIALLY SRN ZONES AND HAVE CONTINUED THE
TREND ABOVE NGM MOS FOR HIGHS TUE AFTN.  THIS DEPENDANT ON AT
LEAST SOME BREAKS IN THE CLOUD COVER.  FNT REMAINS IN THE AREA
OR CLOSE TO THE AREA INTO LATE WEEK...AND PATTERN LOOKS RATHER
UNSETTLED.  HEIGHT FALLS OVER THE WRN U.S. WILL KEEP OUR AREA
IN SWLY FLOW AT 500 MB...AND MODELS CONTINUE TO SHOW QUITE A
BIT OF MOISTURE AT TIMES AROUND THE 700 MB LEVEL.  SO...KEPT
AT LEAST SLGT CHANCE IN FOR WED-FRI.  BELIEVE QPF FROM AVN IS
A BIT OVERDONE THU NGT...BUT DID GO WITH 50 PERCENT POPS OVER
NERN NE.  BOUNDARY SHOULD PUSH SEWD AS A CDFNT ON FRI...WITH
HIGH PRES BUILDING INTO MT.  LEFT SAT-MON PERIOD DRY FOR NOW.
FIRST DRAFT OF THE WORK ZFP WAS SENT EARLIER.

.OMA...NONE.
MILLER

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-192300-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1150 AM CDT MON AUG 19 2002

STORM SPOTTER ACTIVATION SHOULD NOT BE REQUIRED TODAY OR TONIGHT
ACROSS EASTERN NEBRASKA AND SOUTHWEST IOWA.

HIGH PRESSURE EXTENDING FROM MINNESOTA INTO EASTERN NEBRASKA WILL
MOVE EAST THE NEXT 24 HOURS.  A FRONTAL BOUNDARY OVER KANSAS AND
MISSOURI IS EXPECTED TO START LIFTING NORTH.  THUNDERSTORM
DEVELOPMENT WILL BE POSSIBLE TONIGHT AS MOIST AND UNSTABLE AIR IS
LIFTED OVER THE FRONT.	SOME STORMS COULD APPROACH SEVERE LIMITS
IN THE SOUTHERN PART OF SOUTHEAST NEBRASKA LATE TONIGHT.

THIS FRONT WILL CONTINUE LIFTING NORTH THROUGH EASTERN NEBRASKA
AND SOUTHWEST IOWA ON TUESDAY.	THERE WILL BE A GOOD CHANCE OF
STORMS ACROSS THE AREA...AND SOME COULD BE SEVERE.  THE BEST BET
FOR SEVERE STORMS TUESDAY IS ALONG AND NORTH OF A LINE FROM ABOUT
SEWARD NEBRASKA TO CLARINDA IOWA.  LARGE HAIL AND DAMAGING WINDS
ARE EXPECTED TO BE THE MAIN HAZARDS.

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC AND CLIMATIC
INFORMATION IS AVAILABLE ON THE INTERNET AT
WWW.CRH.NOAA.GOV/OAX OR AT WEATHER.GOV (LOWER CASE).

MILLER

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-201100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
554 PM CDT MON AUG 19 2002

STORM SPOTTER ACTIVATION MAY BE NEEDED TONIGHT IN SOUTHEAST
NEBRASKA.

A LOW LEVEL JET WILL DEVELOP TONIGHT...BRINGING INCREASINGLY
MOIST AND UNSTABLE AIR UP FROM THE SOUTH.  THERE IS A CHANCE
THAT STRONG THUNDERSTORMS WILL DEVELOP IN SOUTHEAST
NEBRASKA...MAINLY SOUTH OF A LINE FROM SEWARD TO NEBRASKA CITY.
A FEW OF THESE STORMS COULD CONTAIN LARGE HAIL.  THERE WILL ALSO
BE A CHANCE FOR THUNDERSTORMS ACROSS THE REST OF THE FORECAST
AREA TONIGHT...BUT INSTABILITY IS NOT FORECAST TO BE LARGE ENOUGH
FOR SEVERE WEATHER TO DEVELOP.

ON TUESDAY AND TUESDAY NIGHT A STRONG WARM FRONT WILL LIFT
NORTHWARD FROM THE SOUTHERN PLAINS...AND MOVE ACROSS EASTERN
NEBRASKA AND SOUTHWEST IOWA.  THE ARRIVAL OF VERY WARM AND
UNSTABLE AIR IS LIKELY TO TRIGGER MORE THUNDERSTORMS FROM
TUESDAY INTO TUESDAY NIGHT.  ONCE AGAIN...THERE WILL BE A CHANCE
OF SEVERE WEATHER.  LARGE HAIL AND DAMAGING WINDS WILL BE THE
PRIMARY RISK.

THE FRONT IS FORECAST TO BE IN NORTHERN NEBRASKA OR SOUTHERN
SOUTH DAKOTA BY WEDNESDAY.  THERE WILL BE A CONTINUED RISK OF
SEVERE THUNDERSTORM DEVELOPMENT TO THE NORTH OF THE FRONT...
MAINLY DURING THE LATE AFTERNOON AND OVERNIGHT HOURS.

THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC AND CLIMATIC
INFORMATION IS AVAILABLE ON THE INTERNET AT
WWW.CRH.NOAA.GOV/OAX OR AT WEATHER.GOV (LOWER CASE).

POLLACK