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3/17-3/18 Storm Threat Discussion


Zelocita Weather

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reminds of thewinter of 2010. Coming on the heels of a great Jan/Feb here I could care less.

 

3 winters with over 50" since 09-10 is as good as it gets around here. If we missed these March

snows in a season with below normal snowfall it would be a big deal.

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FORECAST MODELS CONTINUE TO SUPPRESS THE TRACK OFF THE SOUTHERN

MID ATLANTIC COAST BY 12Z MONDAY AS THE ARCTIC HIGH GRADUALLY

WEAKENS ACROSS NEW ENGLAND.

BASED ON ALL MODEL OUTPUT INCLUDING BOTH DETERMINISTIC AND

ENSEMBLES...THE CHANCE FOR LIGHT SNOW WAS DECREASED TO 50 PCT OR

LESS LATE SUNDAY NIGHT THROUGH MONDAY MORNING WITH THE HIGHEST

PROBABILITY OF UP TO 1 INCH OF SNOW OCCURRING ALONG THE COAST

FROM 09Z-15Z MONDAY.

AS YOU KNOW...WEATHER CHANGES...SO STAY TUNED.

Uptown starting to cave it would appear.

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FORECAST MODELS CONTINUE TO SUPPRESS THE TRACK OFF THE SOUTHERN

MID ATLANTIC COAST BY 12Z MONDAY AS THE ARCTIC HIGH GRADUALLY

WEAKENS ACROSS NEW ENGLAND.

BASED ON ALL MODEL OUTPUT INCLUDING BOTH DETERMINISTIC AND

ENSEMBLES...THE CHANCE FOR LIGHT SNOW WAS DECREASED TO 50 PCT OR

LESS LATE SUNDAY NIGHT THROUGH MONDAY MORNING WITH THE HIGHEST

PROBABILITY OF UP TO 1 INCH OF SNOW OCCURRING ALONG THE COAST

FROM 09Z-15Z MONDAY.

AS YOU KNOW...WEATHER CHANGES...SO STAY TUNED.

Uptown starting to cave it would appear.

Really that's how you see this, Upton caving?  Or being responsible forecasters who are adjusting a forecast as the event gets near.  They have an obligation to keep various options on the table.

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Really that's how you see this, Upton caving? Or being responsible forecasters who are adjusting a forecast as the event gets near. They have an obligation to keep various options on the table.

In a way yes. Perhaps caving is a poor choice of words but less than 12 hours ago they were slightly more enthusiastic about this setup. Just posting it to show that at this point even Upton seems to be yielding to a little to no snow event. Unlike some here lol

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FORECAST MODELS CONTINUE TO SUPPRESS THE TRACK OFF THE SOUTHERN

MID ATLANTIC COAST BY 12Z MONDAY AS THE ARCTIC HIGH GRADUALLY

WEAKENS ACROSS NEW ENGLAND.

BASED ON ALL MODEL OUTPUT INCLUDING BOTH DETERMINISTIC AND

ENSEMBLES...THE CHANCE FOR LIGHT SNOW WAS DECREASED TO 50 PCT OR

LESS LATE SUNDAY NIGHT THROUGH MONDAY MORNING WITH THE HIGHEST

PROBABILITY OF UP TO 1 INCH OF SNOW OCCURRING ALONG THE COAST

FROM 09Z-15Z MONDAY.

AS YOU KNOW...WEATHER CHANGES...SO STAY TUNED.

Uptown starting to cave it would appear.

How could they not? Two Euro runs in a row in the short term now have barely 3" of snow making it to DC. This is over for us-has been since last night.

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How could they not? Two Euro runs in a row in the short term now have barely 3" of snow making it to DC. This is over for us-has been since last night.

What? Over? Did you say "over"? Nothing is over until we decide it is! Was it over when the Germans bombed Pearl Harbor? Hell no!

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Sref further north about 50 to 75 miles vs previous run. 0.25" now up, kissing south shore of LI. 0.5" through central NJ. NYC metro, LI, south need to watch this closely. One more shift like that and things change quite dramatically with such a tight gradient. No one in these areas should write this off just yet.

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The NAM actually trended about 50 miles south with the northern extent of the precip--mostly because it tightened up the QPF gradient a ton. Dover, DE gets 0.8" of QPF while Wilmington and PHL get next to nothing.

Actually its just as tight as its been. Its only shifted south.  The max precip band across Maryland/northern Virginia is actually a bit drier than the last two runs.

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The NAM actually trended about 50 miles south with the northern extent of the precip--mostly because it tightened up the QPF gradient a ton. Dover, DE gets 0.8" of QPF while Wilmington and PHL get next to nothing.

The Euro so far south for 2 runs pretty much doomed this north of BWI. It's over north of there and even for BWI it's maybe a few inches.
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To show you guys how bad the NAM is everywhere even in the 24-36 hr timeframe, the 00z 3/11 NAM had 14-17" in the Chicago area and 6-10" out toward northwest IL. The result from the 3/11-3/12 snow event here was 3.6" at O'Hare, 0.1" in Rockford (nw IL), 5.4" here at the NWS office and 6" at Chicago Midway Airport. The highest amount in the Chicago area was 7". All the models have had their struggles across the country this year, and the NAM has had some rare successes but typically it's been the worst guidance and almost unusable at times except in the near term for mesoscale trends.

Didn't one of the TV stations there buy into that?

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