SWODY1
SPC AC 280539
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1139 PM CST TUE NOV 27 2007
VALID 281200Z - 291200Z
..NO TSTM AREAS FORECAST...
..SYNOPSIS...
PROGRESSIVE MID/UPPER LEVEL FLOW PATTERN IS EXPECTED ACROSS THE
CONUS TODAY WITH A LARGE UPPER TROUGH TRACKING EWD FROM THE ROCKIES
AND REACHING THE GREAT LAKES TO TN VALLEY BY 12Z THURSDAY. THE NEXT
UPSTREAM TROUGH IS EXPECTED TO SPREAD INLAND ACROSS THE PACIFIC
NORTHWEST DURING THE LATTER HALF OF THE FORECAST PERIOD. IN THE SRN
STREAM...A WEAK MID LEVEL IMPULSE SHOULD MOVE EAST OF THE FL
PENINSULA BY LATE MORNING OR EARLY AFTERNOON.
..CENTRAL/SRN FL...
SURFACE HEATING WITHIN A MOIST AIR MASS WILL CONTRIBUTE TO MARGINAL
INSTABILITY OVER THE CENTRAL/SRN FL PENINSULA...WHILE WEAK FORCING
FOR ASCENT ALONG TRAILING PORTION OF SRN STREAM IMPULSE SPREADS
ACROSS THIS REGION TODAY. HOWEVER...FORECAST SOUNDINGS INDICATED
WEAK LAPSE RATES WITH WARMING MID LEVEL TEMPERATURES THROUGH THE
PERIOD WHICH SHOULD ACT TO SUPPRESS DEEP MOIST CONVECTION.
..PACIFIC NW...
COLD MID LEVEL TEMPERATURES AND ASCENT ATTENDANT TO UPPER TROUGH
MOVING INLAND LATER THIS EVENING AND OVERNIGHT MAY SUPPORT A FEW
LIGHTNING STRIKES. THIS ACTIVITY SHOULD REMAIN OFFSHORE PRIOR TO
THE START OF DAY 2 WHEN DEEPER CONVECTIVE ELEMENTS MOVE ONSHORE.
.PETERS/LEVIT.. 11/28/2007
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