SWODY1
SPC AC 111239
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0639 AM CST SUN JAN 11 2009
VALID 111300Z - 121200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
BROAD TROUGH WILL PERSIST OVER THE CNTRL AND ERN U.S...DOWNSTREAM
FROM DOMINANT E PACIFIC RIDGE. THE RIDGE WILL FURTHER AMPLIFY AS
JET STREAK NOW IN BC DROPS SE TO THE NRN PLNS...AND SHORTWAVE
IMPULSE NOW IN IL CONTINUES ESE TO THE MID ATLANTIC CST. SOUTH
OF THE LATTER FEATURE...EXPECT LEAD SHORTWAVE TROUGH...ATTM
EXTENDING FROM THE LWR TN VLY TO S TX...TO FURTHER WEAKEN AS IT
SHEARS E IN CONFLUENT FLOW OVER THE SERN U.S. SFC COLD FRONT
ASSOCIATED WITH THE TROUGH IS NOW OVER SE GA. THE FRONT SHOULD MOVE
SLOWLY SE ACROSS THE REMAINDER OF GA AND NRN/CNTRL FL LATER
TODAY/TONIGHT.
...S GA/N FL...
POTENTIAL WILL EXIST FOR WEAK/ISOLD TSTMS ALONG AND BEHIND COLD
FRONT IN S GA AND N FL LATER TODAY/TONIGHT. OVERALL COVERAGE AND
STRENGTH OF STORMS WILL BE LIMITED BY WEAK MID LVL LAPSE
RATES...ABSENCE OF STRONG LOW LVL HEATING...AND RELATIVELY WEAK
ASCENT. SOME INCREASE MAY...HOWEVER...OCCUR TOWARD EARLY EVE OVER N
FL AS UPR DIVERGENCE INCREASES IN RESPONSE TO NRN STREAM IMPULSE
APPROACHING THE MID ATLANTIC CST.
MODERATE...DEEP UNIDIRECTIONAL WSWLY FLOW...MOIST ADIABATIC PROFILES
...AND MODEST BOUNDARY LAYER MOISTURE TOGETHER SUGGEST POTENTIAL FOR
A FEW BANDS OF CONVECTION/POSSIBLE EMBEDDED STORMS AS UPDRAFTS BUILD
THROUGH RELATIVELY WARM LAYER BETWEEN 700-500 MB.
..CORFIDI.. 01/11/2009
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