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Mid-Winter Crisis or Start of Something Big?


mitchnick

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if the gfs comes in colder it might have merit. otherwise it has little continuity behind it and is probably a burp of some sort. i mean, yeah.. it's going to take a heck of a lot to get me excited imby for this event but still.

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quick note:

most people focus on model's inability to accurately represent CAD...but another thing you must consider is that models also have trouble accurately representing the downward mixing of the warm layer in moderate to heavy qpf scenarios....

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quick note:

most people focus on model's inability to accurately represent CAD...but another thing you must consider is that models also have trouble accurately representing the downward mixing of the warm layer in moderate to heavy qpf scenarios....

interesting you say that

the IAD skewt shows a warm layer, but not that bad, at IAD at 33 hrs and 36hrs around 900-975 mb

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interesting you say that

the IAD skewt shows a warm layer, but not that bad, at IAD at 33 hrs and 36hrs around 900-975 mb

p.s. skewts suggest all snow through 30 hrs at IAD and at least part of the next 3 hours

IF NAM verifies, 3" is entirely possible on this run at IAD

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NEAR TERM /THROUGH MONDAY/...

-- Changed Discussion --FOR TONIGHT...HAVE SLGT/CHC POPS IN HIGHER TERRAIN AREAS OF SW

PORTION OF CW ACROSS WEST CENTRAL VA FOR FRZG DRIZZLE FOR MAINLY

AFTER MIDNIGHT. LOCAL 4KM WRF-ARW...3KM HRRR AND SREF...ALONG WITH

LATEST 00Z/17 NAM...ALL SHOW VERY LIGHT PRECIP IN THE AREAS

TONIGHT. THIS IS IN RESPONSE TO WEAK SE LOW LEVEL WINDS THAT ARE

PROGGED BY THE MODEL TO DEVELOP LATE TONIGHT. THE FORECAST MODEL

SOUNDINGS HAVE NO ICE CRYSTALS...AND ANY PRECIP WOULD FALL IN FORM

OF FREEZING DRIZZLE AS OVERNIGHT TEMPS WILL BE COLD. BEST TIMES

FOR FRZG DRIZZLE ARE BETWEEN ABOUT 09Z AND 15Z. STILL...CONFIDENCE

IN GETTING MEASURABLE PRECIP OVERNIGHT IS NOT HIGH...AND HAVE NOT

ISSUED AN ADVISORY.

OVERNIGHT TEMPS WILL BE SEASONABLY COLD. CLOUD COVER OVERNIGHT

WILL BE SOMEWHAT TRICKY...ALREADY AREAS OF MID-LEVEL BROKEN TO

OVERCAST ARE OCCURRING. EXPECT MOSTLY CLOUDY TO CLOUDY SKIES OVERNIGHT.

FOR MONDAY...THE DAY STARTS OUT CLOUDY...WITH SLIGHT CHANCE OF

FREEZING DRIZZLE ACROSS ABOUT THE SW THIRD OF THE REGION...OVER

WEST CENTRAL AND NORTHWEST VIRGINIA...THE SHENANDOAH VALLEY AND

POTOMAC HIGHLANDS. QUICK LOOK AT LATEST 00Z/NAM GUIDANCE SHOWS IT

TO BE A TAD SLOWER ON MOVING MEASURABLE PRECIP NORTH FOR THE LATE

AFTERNOON...KEEPING MOST OF THE CWA DRY THROUGH 00Z/18TH. SO HAVE

KEPT THE DC AND BALTIMORE METRO AREAS OUT OF PRECIP UNTIL LATE IN

THE AFTERNOON.

FORECAST FOR WINTER P-TYPE MONDAY NIGHT WILL BE A CHALLENGE. LATEST

INDICATIONS FROM 00Z NAM GUIDANCE ALONG WITH 21Z/SREF SUGGEST A

QUICK CHANGEOVER FROM ANY SNOW INITIALLY...TO SLEET THEN FREEZING

RAIN. LATEST NAM TRACK OF SURFACE LOW CLOSER TO COAST SUGGESTS

MUCH OF PRECIP FALLING EAST OF ABOUT THE I-81 CORRIDOR WOULD BE

LIQUID. FORTUNATELY ALL GUIDANCE IS PRETTY CLEAR THAT THE SURFACE

HIGH OVER NEW ENGLAND WILL MOVE OFFSHORE MON NIGHT...THUS ALLOWING

FOR THE EROSION OF THE COLD SUB FREEZING WEDGE OF SURFACE AIR.

WHILE THERE COULD BE A PERIOD OF FRZG RAIN...LACK OF A SOURCE OF

COLD SURFACE AIR WOULD KEEP THE PERIOD OF FRZG RAIN LIMITED EAST

OF THE BLUE RIDGE...HOWEVER WEST OF THE BLUE RIDGE A MORE EXTENDED

PERIOD OF FRZG RAIN COULD TAKE PLACE. STAY TUNED.

PREVIOUS SHORT TERM DISCUSSION FOLLOWS...-- End Changed Discussion --

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FORECAST FOR WINTER P-TYPE MONDAY NIGHT WILL BE A CHALLENGE. LATEST

INDICATIONS FROM 00Z NAM GUIDANCE ALONG WITH 21Z/SREF SUGGEST A

QUICK CHANGEOVER FROM ANY SNOW INITIALLY...TO SLEET THEN FREEZING

RAIN. LATEST NAM TRACK OF SURFACE LOW CLOSER TO COAST SUGGESTS

MUCH OF PRECIP FALLING EAST OF ABOUT THE I-81 CORRIDOR WOULD BE

LIQUID. FORTUNATELY ALL GUIDANCE IS PRETTY CLEAR THAT THE SURFACE

HIGH OVER NEW ENGLAND WILL MOVE OFFSHORE MON NIGHT...THUS ALLOWING

FOR THE EROSION OF THE COLD SUB FREEZING WEDGE OF SURFACE AIR.

WHILE THERE COULD BE A PERIOD OF FRZG RAIN...LACK OF A SOURCE OF

COLD SURFACE AIR WOULD KEEP THE PERIOD OF FRZG RAIN LIMITED EAST

OF THE BLUE RIDGE...HOWEVER WEST OF THE BLUE RIDGE A MORE EXTENDED

PERIOD OF FRZG RAIN COULD TAKE PLACE. STAY TUNED.

yawner .. next

the nam looks goodish at 84 for the overrunning potential

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