Severe Storm Outlook Narrative (AC)
Issued by NWS

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000
ACUS48 KWNS 300902
SWOD48
SPC AC 300900

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0400 AM CDT SAT MAY 30 2015

VALID 021200Z - 071200Z

...DISCUSSION...
THE PRIMARY FOCUS FOR ORGANIZED SEVERE THUNDERSTORM POTENTIAL
THROUGH THE MIDDLE/LATE PART OF NEXT WEEK WILL BE ACROSS PORTIONS OF
THE NORTHERN PLAINS/CENTRAL HIGH PLAINS TO THE UPPER MIDWEST. THIS
WILL BE AS TROUGH AMPLIFICATION GRADUALLY OCCURS OVER THE WESTERN
CONUS...WITH A RELATED INCREASE OF CYCLONIC WESTERLIES OVER THE
ROCKIES/ADJACENT HIGH PLAINS AND AS SOMEWHAT RICHER MOISTURE
GRADUALLY DEVELOPS NORTHWARD ACROSS THE PLAINS.

MULTIPLE CATEGORICAL SLIGHT RISKS APPEAR PLAUSIBLE ACROSS THE
AFOREMENTIONED REGION INTO LATE WEEK. INITIALLY FOR DAY
4/TUESDAY...CURRENT THINKING IS THAT AN ORGANIZED SEVERE POTENTIAL
WILL EXIST ACROSS PARTS OF THE DAKOTAS AND POSSIBLY NEB...WITH
MODEST VERTICAL SHEAR AND VERY STEEP LAPSE RATES/AMPLE BUOYANCY
EXPECTED TO BE COLLOCATED NEAR/EAST-SOUTHEAST OF AN ADVANCING
SURFACE LOW/COLD FRONT. EARLY INDICATIONS ARE THAT ONE OR MORE MCS/S
COULD DEVELOP ACROSS THE REGION TUESDAY NIGHT. WHILE NOT CURRENTLY
GRAPHICALLY DELINEATED...DAYS 5/6 WEDNESDAY/THURSDAY MAY ALSO OFFER
SLIGHT RISK-CALIBER SEVERE POTENTIAL SOMEWHERE FROM THE
NORTH-CENTRAL HIGH PLAINS/DAKOTAS TO MN/IA. ELSEWHERE...SOME
PULSE-TYPE STRONG TO SEVERE THUNDERSTORMS MAY BE
POSSIBLE INTO MID-WEEK ACROSS THE SOUTHEAST STATES ALONG/SOUTH OF A
RESIDUAL FRONT.

..GUYER.. 05/30/2015



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