SWODY2
SPC AC 170600
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0100 AM CDT TUE APR 17 2007
VALID 181200Z - 191200Z
..NO SVR TSTM AREAS FORECAST...
..SYNOPSIS...
WEAKENING UPPER FEATURE -- MOVING ACROSS THE LOWER MS VALLEY LATE IN
THE DAY 1 PERIOD -- WILL CONTINUE TO WEAKEN WHILE BECOMING ABSORBED
INTO THE LARGER-SCALE CYCLONIC FLOW OVER THE OH VALLEY/MID-SOUTH
REGION. THIS FEATURE SHOULD MOVE OFF THE ATLANTIC COAST BY LATE
AFTERNOON...WHILE LARGER-SCALE CYCLONIC FLOW PERSISTS OVER THE ERN
CONUS.
FURTHER W...A COMPLEX UPPER TROUGH -- CONSISTING INITIALLY OF TWO
SEPARATE SHORT-WAVE TROUGHS/LOWS -- WILL EVOLVE OVER THE WRN CONUS.
THE ERN-MOST FEATURE SHOULD SHIFT ACROSS THE PAC NW/GREAT BASIN
THROUGH THE DAY...AND BEGIN AFFECTING THE NRN HIGH PLAINS BY LATE
AFTERNOON. THIS FEATURE WILL BE ACCOMPANIED BY A FAIRLY PRONOUNCED
SURFACE REFLECTION -- WHICH SHOULD RESIDE ACROSS THE HIGH PLAINS AS
A STRONG LEE LOW/TROUGH THROUGH THE LATTER HALF OF THE PERIOD.
..NRN HIGH PLAINS...
DRY BOUNDARY LAYER/VERY LOW PW WILL PREVAIL ACROSS THE NRN HIGH
PLAINS THIS PERIOD...AHEAD OF ADVANCING UPPER TROUGH. STEEP
MID-LEVEL LAPSE RATES AHEAD OF THIS TROUGH COMBINED WITH DAYTIME
HEATING SHOULD RESULT IN MARGINAL CAPE BY AFTERNOON...WITH A FEW
HIGH-BASED STORMS POSSIBLE. A STRONGER STORM OR TWO COULD PRODUCE
SMALL HAIL OR A LOCALLY STRONG WIND GUST. HOWEVER...IT APPEARS ATTM
THAT LIMITED INSTABILITY...AND SHEAR WHICH SHOULD REMAIN MARGINAL AT
BEST...WILL LIKELY PRECLUDE APPRECIABLE SEVERE THREAT.
.GOSS.. 04/17/2007
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