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The Second Wave: Dec 10 (Model Discussion)


stormtracker

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I don't understand LWX forecast at all especially for DC. Rain and snow? 1/2"? I don't see anything that suggests rain. Reading their discussion it seems they are riding the euro completely.

I think this looks good for dc.

 

Yeah I'm wondering the same thing?  I heard the radio talking about 2-4" tomorrow (I don't know what their source was - maybe they read americanwx LOL)...but LWX has the area with a half inch or less.

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I don't understand LWX forecast at all especially for DC. Rain and snow? 1/2"? I don't see anything that suggests rain. Reading their discussion it seems they are riding the euro completely.

I think this looks good for dc.

Maybe the old euro. Last night's run was cold, at least at 850 and the surface. More likely they were still shy from the 00z NAM which was mixy.

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I don't understand LWX forecast at all especially for DC. Rain and snow? 1/2"? I don't see anything that suggests rain. Reading their discussion it seems they are riding the euro completely.

I think this looks good for dc.

I don't understand that either...but I gotta say..the Euro is a nagging thought in the back of my head....although its good to see all other guidance on track for a decent event...it's not like the others have moved toward the Euro, it's the other way around this time.

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All guidance is locked into a good stripe of snow here. Euro is furthest east for now but I think that will change with the next run.

 

It's another narrow band of winners. Closer to DC this time but far from a lock. The images I'm using are snow maps. I don't like snow maps at all except for they do a good job showing the precip distribution and stripe.

 

Here's what we have this morning:

 

High res nam:

 

 

 

RGEM:

 

 

 

GFS:

 

 

 

I checked the DCA WFDI and it looks like the odds favor a dc or near dc bullseye. 

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I don't understand that either...but I gotta say..the Euro is a nagging thought in the back of my head....although its good to see all other guidance on track for a decent event...it's not like the others have moved toward the Euro, it's the other way around this time.

I hope like hell this nails DC. I hate to see friends suffer. I'll gladly cheer from the sidelines this time.

Whatever it is, it sure looks quick. One time I'd like to see about an 18 hour event with about 1/2 per hour. Talk about mood flakes!

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AS THIS SYSTEM CONTINUES EAST...MODELS HAVE BEEN MOVING INTO
BETTER AGREEMENT SHOWING A BRIEF PERIOD OF MODERATE TO LOCALLY
HEAVY SNOW DEVELOPING OVER PARTS OF THE MID ATLANTIC REGION ON
TUE. INCREASING WARM AIR/MOISTURE ADVECTION AHEAD OF A WEAK
SURFACE WAVE DEVELOPING ACROSS THE SOUTHEAST INTERACTING WITH
RIGHT-ENTRANCE REGION UPPER JET DYNAMICS IS EXPECTED TO HELP
PRODUCE A PERIOD OF MODERATE TO LOCALLY HEAVY PRECIPITATION ALONG
THE MID ATLANTIC COAST. MOIST LOW-MID LEVEL FRONTOGENESIS MAY
HELP TO SUPPORT BANDED PRECIPITATION ACCENTUATING AMOUNTS FROM
NORTHERN VA TO THE SOUTHERN NEW ENG COAST...WHERE A SLIGHT-MDT
RISK FOR AT LEAST 4-INCHES HAS BEEN INDICATED ON DAY 2.

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AS THIS SYSTEM CONTINUES EAST...MODELS HAVE BEEN MOVING INTO

BETTER AGREEMENT SHOWING A BRIEF PERIOD OF MODERATE TO LOCALLY

HEAVY SNOW DEVELOPING OVER PARTS OF THE MID ATLANTIC REGION ON

TUE. INCREASING WARM AIR/MOISTURE ADVECTION AHEAD OF A WEAK

SURFACE WAVE DEVELOPING ACROSS THE SOUTHEAST INTERACTING WITH

RIGHT-ENTRANCE REGION UPPER JET DYNAMICS IS EXPECTED TO HELP

PRODUCE A PERIOD OF MODERATE TO LOCALLY HEAVY PRECIPITATION ALONG

THE MID ATLANTIC COAST. MOIST LOW-MID LEVEL FRONTOGENESIS MAY

HELP TO SUPPORT BANDED PRECIPITATION ACCENTUATING AMOUNTS FROM

NORTHERN VA TO THE SOUTHERN NEW ENG COAST...WHERE A SLIGHT-MDT

RISK FOR AT LEAST 4-INCHES HAS BEEN INDICATED ON DAY 2.

Yes and their map makes the LWX forecast even more baffling.

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Yeah I'm wondering the same thing?  I heard the radio talking about 2-4" tomorrow (I don't know what their source was - maybe they read americanwx LOL)...but LWX has the area with a half inch or less.

Probably just being conservative especially after blowing it yesterday. Mount Holly is doing the same thing. This looks like a quick hitter, with some dynamics and likely a heavy snow band or two(like yesterday) and the placement is uncertain. I could see some places with under an inch, and others with 4. They will look at the afternoon runs and tweak the forecast as necessary.

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Probably just being conservative especially after blowing it yesterday. Mount Holly is doing the same thing. This looks like a quick hitter, with some dynamics and likely a heavy snow band or two(like yesterday) and the placement is uncertain. I could see some places with under an inch, and others with 4. They will look at the afternoon runs and tweak the forecast as necessary.

I heard the same thing. I saw NBC4 has a 2-4 swath over the city, so maybe they are the source. http://www.nbcwashington.com/weather/stories/Wintry-Mix-Likely-on-Sunday-234604191.html?_osource=SocialFlowFB_DCBrand

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One important aspect to keep mind for us close in dca folks with this event is that a front is clearing with it. The forcing and bands will move through all regions during the event. Pretty sure everyone sees some nice rates this go around. I have a hunch that the heaviest rates will occur closer to the coast vs further west. The system intensifies as it moves though. 

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