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February 12-13 Storm, Part II


stormtracker

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Nam doesn't close off h5 until 72 but the low track is epic. I think we just found our perfect solution but it's the nam so...

Still not running to the Euro at least... which keeps it sort of lonely on the western edge. 

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purpled finally.  The NAM is about as good as we can get.  Why couldn't this be tomorrow at 18z

It can still get a little better for us. I want every other model a little too east if the Euro is where it is. 

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24" near Wes. DC around 18", but hard to tell.

If I were to draw a fantasy 850 low position for a big wes snowstorm.  The 18Z NAM has it.   If it is right, or even partly right, gonna have some two inch an hour rates which will get Matt stoked.    If we weren't still in the NAM fantasy range, I'd look at sounding for an unstable layer and thundersnow potential.  That might be my Wed article.

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Afternoon LWX disco

 

.SHORT TERM /WEDNESDAY THROUGH THURSDAY/...
LOOKING LIKELY THAT A HIGH IMPACT COASTAL STORM WILL AFFECT THE
REGION FOR LATE WEDNESDAY THROUGH LATE THURSDAY DESPITE PHASING AND
TRACK DIFFERENCES IN THE MODELS. SOUTHERN STREAM TROUGH AND NORTHERN
STREAM SHORT WAVE /CURRENTLY OVER CALIFORNIA AND OFF THE BRITISH
COLUMBIA COAST RESPECTIVELY PER AFTERNOON WATER VAPOR IMAGERY/ WILL
PHASE WEDNESDAY....RESULTING IN A RAPIDLY DEEPENING SURFACE LOW
THAT WILL TRACK NEAR THE MID-ATLANTIC COASTLINE ON THURSDAY.
DOWNSTREAM ANTI-CYCLONIC UPPER JET IN THE ECMWF IS STRONGER BY
ABOUT 40KT COMPARED TO GFS/NAM AND RESULTING IN STRONGER
CYCLOGENESIS AND FARTHER WEST TRACK OF SURFACE LOW. ECMWF/CANADIAN
ALSO PHASING THE TWO PIECES OF ENERGY QUICKER. THE RESULTANT
THERMAL GRADIENT IN THE ECMWF IS STRONGER AS WELL...WITH MORE
RAIN AND SLEET TO AREAS ALONG AND EAST OF I-95 CORRIDOR. GFS/NAM
FORECAST SOUNDINGS SHOW SNOW AT THE ONSET THEN SLEET MIXING IN
NEAR THE CHSPK BAY AS WARM NOSE PUSHES NNE.

MAJOR QPF DIFFERENCES IN MODELS AS WELL WITH ECMWF SHOWING A
WIDESPREAD 1.5 TO 2.5 INCHES...WHICH IS CONSISTENT TO THE
PREVIOUS RUN AS WELL. NAM/GFS SHOWING A SHARP CUTOFF GRADIENT OF
QPF ON THE NORTHWEST SIDE...LIKELY DUE TO PRECIP BEING GENERATED
WITH WRAP AROUND MOISTURE/TROWAL FORCING AND IN A BANDING NATURE.
ECMWF SHOWS MORE SYNOPTIC SCALE LIFT ALONG WITH DEFORMATION ZONE
PRECIP AND HENCE THE HIGHER QPF. SNOW WILL BE HEAVY AND WET WITH
12 OR 10:1 SNOW RATIOS EXPECTED...ALTHOUGH A BIT HIGHER ACROSS THE
HIGHER ELEVATIONS AND LOWER NEAR THE RAIN/SNOW LINE.

DESPITE THESE DIFFERENCES...CONFIDENCE IS HIGH ENOUGH AT THIS
POINT TO ISSUE A WINTER STORM WATCH FOR THE ENTIRE CWA WITH THE
POTENTIAL FOR A SIGNIFICANT ACCUMULATING SNOW AND/OR SLEET IS
LIKELY. STORM SHOULD EXIT THURSDAY EVENING TO THE NORTHEAST.
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