Severe Thunderstorm Warning 147, NWS Omaha, NE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
253 PM CDT MON JUL 8 2013

.DISCUSSION...

MAIN CONCERNS IN THE SHORT TERM WILL BE TIMING AND EXTENT
OF CONVECTION AND HOT TEMPERATURES ON TUESDAY.

LITTLE CHANGE TO OVERALL FORECAST TRENDS. CLOUD CLUSTER WITH
ISOLATED SHOWERS OVER SOUTHEAST NEBRASKA AT 19Z ASSOCIATED WITH
MID LEVEL WAVE IS EXPECTED TO CONTINUE TO TRACK EAST. THE NEXT
ROUND OF CONVECTION IS FORECAST TO DEVELOP MID TO LATE AFTERNOON
OVER NORTHWEST NEBRASKA AND SOUTHWEST SOUTH DAKOTA AS ANOTHER
SERIES OF SHORT WAVES APPROACH THE AREA...THEN TRACK EAST SIMILAR
TO LAST NIGHTS EVENT. MAIN UNCERTAINTY WILL BE SOUTHWARD EXTENT
OF CONVECTION AS 12Z EURO KEEPS PRIMARY FOCUS ACROSS SOUTH DAKOTA.

HOT AND HUMID CONDITIONS ON TAP FOR TUESDAY AS STRONG SHORT WAVE
TRACKS ALONG THE NORTHERN U.S. BORDER WITH COLD FRONT MOVING INTO
THE FORECAST AREA DURING THE AFTERNOON. HIGHER DEW POINTS EXPECTED
TO BE OVER SOUTHEAST NEBRASKA AND SOUTHWEST IOWA WHERE
TEMPERATURES WILL CLIMB INTO THE UPPER 90S WITH HEAT INDICES IN
THE 105 TO 110 RANGE. AS A RESULT HAVE ISSUED A HEAT ADVISORY
FOR TUESDAY AFTERNOON FOR THIS AREA. SOME CHANCE OF STORMS WITH
THE FRONT AS IT MOVES THROUGH IN THE AFTERNOON AND EVENING.
COOLER TEMPERATURES FOLLOW BEHIND THE COLD FRONT FOR WEDNESDAY
WITH HIGH PRESSURE BUILDING INTO THE REGION. HIGH PRESSURE MOVES
EAST ON THURSDAY WITH WARMER AIR RETURNING TO THE REGION. ALONG
WITH THE WARM ADVECTION COMES SOME CHANCE OF MORE THUNDERSTORMS...
ALTHOUGH HAVE NOT ADDED TO FORECAST AT THIS TIME DUE TO
UNCERTAINTY BETWEEN MODEL SOLUTIONS. EURO SHOWS STRONGEST SIGNAL
WHILE GFS AND NAM MORE SPOTTY AND FURTHER WEST WITH QPF.

HEAT CONTINUES EARLY IN THE EXTENDED PERIOD INTO SATURDAY AS UPPER
HIGH EXPANDS AGAIN ACROSS THE REGION. ANOTHER FRONT/TROUGH MOVES
INTO NORTHERN PARTS OF NEBRASKA ON SATURDAY THEN STALLS WITH
MODELS FOCUSING PERIODS OF CONVECTION ALONG THIS BOUNDARY INTO
EARLY NEXT WEEK.

&&

.AVIATION...
18Z TAFS FOR KOFK...KLNK AND KOMA.

VFR CONDITIONS ARE EXPECTED UNTIL THUNDERSTORMS ROLL IN FROM THE
EAST BETWEEN 04Z AND 12Z. SCATTERED TO BROKEN MID LEVEL CLOUDS
WILL BE THE RULE INTO THE EVENING. AN ISOLATED SHOWER OR STORM
COULD POP UP...BUT WILL LIKELY NOT AFFECT TAF SITES. HOWEVER MORE
STORMS FIRING IN WESTERN NEBRASKA WILL MOVE EAST AS A LINE OF
STORMS OVERNIGHT...SWEEPING THROUGH ALL OF EASTERN NEBRASKA.
BEST CHANCES FOR THESE TO AFFECT TAF SITES WILL BEGIN AT 04Z AT
KOFK...THEN SPREAD EAST AND SOUTHEAST TO KLNK AND KOMA BY 06Z.
SOUTHWEST WINDS AND VFR CONDITIONS SHOULD RETURN TUESDAY MORNING
AFTER STORMS PASS.

&&

.OAX WATCHES/WARNINGS/ADVISORIES...
NE...HEAT ADVISORY FROM NOON TO 7 PM CDT TUESDAY FOR NEZ045-052-053-
     067-068-088>093.

IA...HEAT ADVISORY FROM NOON TO 7 PM CDT TUESDAY FOR IAZ055-056-069-
     079-080-090-091.

&&

FOBERT/DERGAN

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1139 AM CDT MON JUL 8 2013

IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034-
042>045-050>053-065>068-078-088>093-090645-
MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-
PAGE-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE-BOONE-MADISON-
STANTON-CUMING-BURT-PLATTE-COLFAX-DODGE-WASHINGTON-BUTLER-
SAUNDERS-DOUGLAS-SARPY-SEWARD-LANCASTER-CASS-OTOE-SALINE-
JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-RICHARDSON-
1139 AM CDT MON JUL 8 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST
NEBRASKA AND SOUTHEAST NEBRASKA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A SLIGHT CHANCE FOR SEVERE THUNDERSTORMS FROM LATE
EVENING THROUGH THE OVERNIGHT ACROSS ALL OF THE OUTLOOK AREA.
DAMAGING WINDS WILL BE THE PRIMARY THREAT...BUT LARGE HAIL AND
LOCALLY HEAVY RAIN COULD ALSO OCCUR.

A STATIONARY FRONT EXTENDING WEST TO EAST FROM NEAR COLUMBUS
NEBRASKA TO HARLAN IOWA WILL REMAIN IN PLACE TODAY AND TONIGHT.
WARM AND HUMID AIR ALONG WITH DAYTIME HEATING MAY SPARK A FEW
THUNDERSTORMS LATE IN THE AFTERNOON NEAR AND SOUTH OF THE FRONT.
SOME OF THESE STORMS COULD PRODUCE GUSTY WINDS AND SMALL HAIL.
HOWEVER THUNDERSTORMS DEVELOPING IN THE HIGH PLAINS THIS AFTERNOON
AHEAD OF AN UPPER LEVEL IMPULSE ARE EXPECTED TO PROGRESS EAST
OVERNIGHT...REACHING NORTHEAST NEBRASKA BY LATE EVENING...THEN
THE REST OF EASTERN NEBRASKA AND SOUTHWEST IOWA AFTER MIDNIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ANOTHER ROUND OF SEVERE STORMS WILL BE TUESDAY AFTERNOON ALONG
ANOTHER FRONTAL BOUNDARY DROPPING OUT OF THE DAKOTAS AND INTO THE
CENTRAL PLAINS. AGAIN...DAYTIME HEATING IN COMBINATION WITH A
MOISTURE RICH ENVIRONMENT WILL LIKELY LEAD TO SOME STORMS BECOMING
SEVERE...PARTICULARLY ALONG AND SOUTH OF INTERSTATE 80. HAIL AND
DAMAGING WINDS WILL BE THE MAIN THREATS.

HOT AND HUMID CONDITIONS TUESDAY AFTERNOON WILL LEAD TO HEAT INDEX
VALUES NEAR 105 GENERALLY SOUTH OF A LINE FROM LINCOLN TO OMAHA
AND HARLAN.

THE NEXT CHANCE FOR THUNDERSTORMS WILL COME THIS WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED OVERNIGHT ACROSS ALL OF THE
OUTLOOK AREA.

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