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December 16th event


RaleighWx

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This system reminds of one that hit when I was in 9th grade. They called for little to no accumulation. That morning when I got on the bus there was a mist in the air, but I knew something was up when I slid on the road getting on the bus. 30 minutes later our bus was stuck on the road because it couldn't get up a icy hill. Cars were wrecking all over the place because of a light glace of ice on the road. The police had to come and take everyone on the bus home. So, even if it isn't much, a little snow and ice can cause big problems on the road around here.

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I agree. I mean if it happened once in a while it would actually make sense but what would be a reason not to issue a Frz. rain adv for atleast NW GA for AT BEST a few hrs of frz rain this afternoon. I mean you have all kinds of reports coming in just to the west and guess what they were warmer overnight and the past few days so use common sense. I am just baffled by how they can miss everything.

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The new NAM is a nice hit for VA.

Has been that way for several runs, taking the heaviest axis through south and central VA, compared to the GFS which has it along the NC VA boarder... I am interested in seeing the other 12z regional models, namely the WRF's, as the 0z runs (including the RGEM) were more inline with the global and not nearly as far north as the NAM with the QPF.

0z WRF-ARW

post-382-0-98730300-1292425730.png

12z NAM

post-382-0-43609700-1292425877.png

6z GFS

post-382-0-87431700-1292425911.png

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Thanks. I'm in Dallas, GA.

Welcome to the board. I lived in Hiram for around 5 years. That was back before hwy 278 blew up. There was nothing there then. Me and my now wife used to get up on Saturday mornings and drive to Dallas to get biscuits from Martins. Anyway welcome!

Not expecting much w/ this Thurday system for my area. The heaviest precip has shifted north over the past 2 days or so. It will be nice to see some possible flurries in the air before the change over.

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Welcome to the board. I lived in Hiram for around 5 years. That was back before hwy 278 blew up. There was nothing there then. Me and my now wife used to get up on Saturday mornings and drive to Dallas to get biscuits from Martins. Anyway welcome!

Not expecting much w/ this Thurday system for my area. The heaviest precip has shifted north over the past 2 days or so. It will be nice to see some possible flurries in the air before the change over.

Thanks. I'm eating a biscuit from Martin's right now actually. :thumbsup:

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Has been that way for several runs, taking the heaviest axis through south and central VA, compared to the GFS which has it along the NC VA boarder... I am interested in seeing the other 12z regional models, namely the WRF's, as the 0z runs (including the RGEM) were more inline with the global and not nearly as far north as the NAM with the QPF.

0z WRF-ARW

post-382-0-98730300-1292425730.png

12z NAM

post-382-0-43609700-1292425877.png

6z GFS

post-382-0-87431700-1292425911.png

So close we can taste it...... i guess its not too much to ask to get a jog 50 miles south :whistle:

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I am wondering at just how the PV will play into this and I think the NAM may be just a touch too far north as a result of it. I could be wrong but I think it may be dislodging a bit too quickly. I still think this is primarily a fail for my area and best north of 40 toward VA but I wouldn't be surprised to see some measurable in the triangle.

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Has been that way for several runs, taking the heaviest axis through south and central VA, compared to the GFS which has it along the NC VA boarder... I am interested in seeing the other 12z regional models, namely the WRF's, as the 0z runs (including the RGEM) were more inline with the global and not nearly as far north as the NAM with the QPF.

What do you attribute the NAM's northern stubborness to? It certainly continues to be farther north.

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DT call found in the MA thread. Good luck N- NC..

Is that a coffee stain around Onslow Bay, or just the paint left over from him throwing it? :lol: As is par for the MA, snow chances don't really exist south of VA, and this map illustrates it. If the NAM has a handle on QPF amounts and location, he will likely fair very well on this call. Like some of the other well known mets (i.e. JB), Dave has an audience, and sometimes you see products catered to such.

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That would be a huge fail for NC.

Not really.... to be a huge fail we would have to have been expecting a decent hit. Since just about everyone in NC should only get a light even out of this I don't see why that would be a huge fail. Looks like a pretty good call to me as far as snow accums go.

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I agree with this statement!

Is that a coffee stain around Onslow Bay, or just the paint left over from him throwing it? :lol: As is par for the MA, snow chances don't really exist south of VA, and this map illustrates it. If the NAM has a handle on QPF amounts and location, he will likely fair very well on this call. Like some of the other well known mets (i.e. JB), Dave has an audience, and sometimes you see products catered to such.

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To add to this post...

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC

1002 AM EST WED DEC 15 2010

.SYNOPSIS...

COLD CANADIAN HIGH PRESSURE WILL REMAIN ACROSS THE REGION

TODAY...AND MAINTAIN MUCH BELOW NORMAL TEMPERATURES OVER THE NEXT

COUPLE OF DAYS. A FAST MOVING LOW PRESSURE SYSTEM WILL CROSS THE

CAROLINAS WEDNESDAY NIGHT AND THURSDAY...WITH ANOTHER AREA OF LOW

PRESSURE DEVELOPING OFF THE SOUTHEAST COAST OVER THE WEEKEND.

&&

.NEAR TERM /THROUGH TONIGHT/...

-- Changed Discussion --CONCERN IS INCREASING REGARDING EXPECTED QPF ACROSS THE REGION

TONIGHT INTO THURSDAY. THE 12Z OPERATIONAL NAM IS STILL RATHER

SPARSE EAST OF THE MTNS...HOWEVER...THE 09Z SREF MEAN QPF VALUES

HAVE TRENDED QUITE A BIT WETTER. STILL PLAN ON HOLDING OFF ON WINTER

HAZARD ISSUANCE PENDING FULL REVIEW OF INCOMING 12Z MODEL DATA.

MID AND HIGH CLOUDS WILL CONTINUE TO INCREASE THIS AFTERNOON AS AN

UPPER JET AXIS MOVES INTO THE SRN APPALACHIANS. SFC HIGH PRESSURE

WILL QUICKLY SLIDE EAST OF THE AREA AND A WARM FRONT WILL APPROACH

FROM THE SW. THE 12Z NAM IS ACTUALLY DOING A DECENT JOB OF DEPICTING

ISENTROPIC LIFT INDUCED PRECIP THIS MORNING ACROSS AL...AND THIS

PRECIP SHOULD REACH THE SW PART OF THE CWFA FROM 00Z TO 03Z THIS

EVENING BEFORE SPREADING RAPIDLY ACROSS THE FORECAST AREA. WITH THE

SLIGHTLY HIGHER QPF EXPECTATION...PRECIPITATION TYPE WILL BE KEY.

STILL EXPECTING MAINLY A LIGHT FROZEN MIX AT ONSET...TRANSITIONING

TO FREEZING/FROZEN OVERNIGHT AND FINALLY ALL FREEZING TOWARD

DAYBREAK THURSDAY. FOR SOME MTN LOCATIONS...THIS MIXED BAG MAY BE

THE ONLY THING THAT KEEP ANY ACCUMS FROM REACHING WARNING CRITERIA

IN SPOTS.

EXPECT FAIRLY WIDESPREAD WINTER WEATHER ADVISORIES TO BE POSTED

EARLY THIS AFTERNOON ONCE THE DETAILS ARE WORKED OUT.-- End Changed Discussion --

Evidently GSP about to issue a Winter Weather Advisory for I85 along and north corridor around Charlotte

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Looks like the local media talking about this storm on Monday was indeed the kiss of death. WRAL called for up to 2 inches of snow here just this morning, and now everyone is saying less than an inch.

WRAL called for a Trace - 2". I think that's a pretty good call. That means we could get a trace w/ a max of 2". You just can't look at the 2" and forget about the trace part.

BTW, nice writeup Allan!

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What do you attribute the NAM's northern stubborness to? It certainly continues to be farther north.

Don't exactly know, however, we are not talking a huge difference, but the implications for N NC could be sig, depending on what verifies. The NAM is stronger than the GFS with a H5 packet over MO and IL at 18hrs, compared to the GFS. Granted, some of this is due to the higher resolution, but the extent to which this feature impacts the QPF downstream looks like one reason. The PV is also stronger on the NAM, and displaced a little to the SE of the GFS position at 18hrs, which would argue the QPF should be a little south, as the NAM has slightly lower heights in the MA, but it is north on amounts compared to the global.

Also look at the Data ingest for the 12z American models...

SENIOR DUTY METEOROLOGIST NWS ADMINISTRATIVE MESSAGE

NWS NCEP CENTRAL OPERATIONS CAMP SPRINGS MD

1508Z WED DEC 15 2010

12Z NCEP MODEL PRODUCTION IS ON TIME..ZERO MEXICAN RAOBS WERE

AVAILABLE FOR 12Z NAM/GFS INGEST.

12Z GFS RAOB RECAP

YAK/70361 - MISSED THE NAM...IN FOR THE GFS

ASY/70414 - 10158

CAR/72712 - SHORT TO 824MB

ANN/70398 - 10142

APG/74002 - PURGED ALL HGTS...BASELINE ERROR

JAN/72235 - PURGED TEMPS/MOISTURE 712-597MB...WET BULB EFFECT

DSD/78486 - PURGED WINDS 878MB-814MB

APG is Aberdeen Proving Ground and JAN is Jackson MS

Great write-up Allan! :thumbsup:

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