sardog1
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From the NWS Gray/Portland forecast discussion this morning:
FROM LATE THU NIGHT AND INTO THE WEEKEND A VERY COMPEX SITUATION
DEVELOPS AND MODELS ARE SHOWING CONTINUITY OF ALLOWING A LARGE
CHUNK OF UPPER LEVEL ENERGY TO MOVE ACROSS THE OHIO VALLEY THU NGT
AND THEN EVER SO SLOWLY DRIFT EWD TOWARD THE MID ATLANTIC COAST
FRI INTO SAT. THESE DYNAMICS COMBINED WITH A LARGE COLD SFC HIGH
DRAPED ACROSS SRN CANADA AND NRN NEW ENGLAND ALLOWS A TIGHT
BAROCLINIC ZONE TO SET UP S OF THE NEW ENGLAND COAST. MODELS
GENERALLY AGREE ON LOW PRES TO SLOWLY EVOLVE OFF THE MID ATLANTIC
COAST BY FRIDAY MORNING AND THEN ONLY DRIFT SLOWLY TO THE NE
WAITING OF THE UPPER LEVEL ENRGY TO CAPTURE IT OVER THE WEEKEND. THIS IS
A VERY DYNAMIC SETUP THAT WE NOMALLY SEE LATER IN THE SEASON AND
TRENDS OF THE MODELS WILL NEED TO BE WATCHED CLOSELY. WILL EXPECT
GUIDANCE TO HANDLE THIS SYSTEM POORLY AS REFLECTED IN MAX TEMPS
FOR LATER IN THE WEEK WHICH WE LOWERED BY 5-10 DEGS SINCE A
DRAINAGE NNELY FLOW DEVELOPS AS A COASTAL FRONT DEVELOPS. TEMPS WILL BE
COLD ALOFT BUT MARGINAL IN THE BOUNDARY LAYERS SO PTYP WILL ALSO
BE A PROBLEM. BOTTOM LINE...STAY TUNED!
FROM LATE THU NIGHT AND INTO THE WEEKEND A VERY COMPEX SITUATION
DEVELOPS AND MODELS ARE SHOWING CONTINUITY OF ALLOWING A LARGE
CHUNK OF UPPER LEVEL ENERGY TO MOVE ACROSS THE OHIO VALLEY THU NGT
AND THEN EVER SO SLOWLY DRIFT EWD TOWARD THE MID ATLANTIC COAST
FRI INTO SAT. THESE DYNAMICS COMBINED WITH A LARGE COLD SFC HIGH
DRAPED ACROSS SRN CANADA AND NRN NEW ENGLAND ALLOWS A TIGHT
BAROCLINIC ZONE TO SET UP S OF THE NEW ENGLAND COAST. MODELS
GENERALLY AGREE ON LOW PRES TO SLOWLY EVOLVE OFF THE MID ATLANTIC
COAST BY FRIDAY MORNING AND THEN ONLY DRIFT SLOWLY TO THE NE
WAITING OF THE UPPER LEVEL ENRGY TO CAPTURE IT OVER THE WEEKEND. THIS IS
A VERY DYNAMIC SETUP THAT WE NOMALLY SEE LATER IN THE SEASON AND
TRENDS OF THE MODELS WILL NEED TO BE WATCHED CLOSELY. WILL EXPECT
GUIDANCE TO HANDLE THIS SYSTEM POORLY AS REFLECTED IN MAX TEMPS
FOR LATER IN THE WEEK WHICH WE LOWERED BY 5-10 DEGS SINCE A
DRAINAGE NNELY FLOW DEVELOPS AS A COASTAL FRONT DEVELOPS. TEMPS WILL BE
COLD ALOFT BUT MARGINAL IN THE BOUNDARY LAYERS SO PTYP WILL ALSO
BE A PROBLEM. BOTTOM LINE...STAY TUNED!