SPC AC 261248
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0648 AM CST SAT DEC 26 2009
VALID 261300Z - 271200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
DEEP CLOSED LOW OVER THE UPR MS VLY WILL BEGIN TO SLOWLY WEAKEN THIS
PERIOD AS UPSTREAM BLOCK HOLDS FIRMLY OVER AB. S OF THE LOW...SRN
STREAM DISTURBANCE NOW OVER NRN CHIHUAHUA WILL SHEAR ENE TO THE S
ATLANTIC CST BY EARLY SUNDAY. THIS SHOULD SUPPORT
MAINTENANCE/MODEST DEEPENING OF SFC WAVE NOW OVER TIDEWATER VA.
...LONG ISLAND/SRN NEW ENGLAND...
LOW LVL WAA WILL INCREASE OVER SRN NEW ENGLAND/LONG ISLAND LATER
TODAY/TONIGHT AS 60 KT SSWLY LLJ SHIFTS NEWD AHEAD OF VA SFC WAVE.
PERSISTENT WAA ON SW SIDE OF RETREATING CP AIR MASS WILL RESULT IN
SUBSTANTIAL PRECIPITATION...WITH EMBEDDED ELEVATED CONVECTION OVER
THE WRN ATLANTIC NWD INTO SRN NEW ENGLAND. MUCAPE ACROSS REGION MAY
REACH 200 J/KG FOR PARCELS BASED IN THE 700-650 MB LAYER. ALTHOUGH
COOL AIR LIKELY WILL PERSIST AT THE SFC...SUFFICIENT ELEVATED
BUOYANCY MAY DEVELOP TO SUPPORT LIGHTNING DISCHARGE WITHIN STRONGER
UPDRAFTS.
..CORFIDI.. 12/26/2009
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z
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