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SW/Central/SE VA Disco


Martin

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RIC should be cautious until snow is on the ground and the storm passed. Miller A's haven't been kind to us recently.

You can never go wrong if you go 2-4" for a Richmond snowstorm. But, that is almost like saying it'll be 92 on 7/4. When looking at the climate period of record, an official 4" snowstorm occurs on average about once a year. And even the last 10-20 years, storms in the 3-4" range have occurred with such regularity that it's not unreasonable for a Richmonder to believe that.  However, you're taking a big risk if you go more than 5.0". And then, anything over 7 or 8", is in my opinion, extremely risky and is not likely to happen given the frequency of such events since 1990.

 

Plus, I would be inclined to perhaps take more risks with overrunning events such as 1/30/10. Coastal storms worry me b/c of the higher chance of precip type issues.

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0Z Euro is now way too close for comfort. Cutoff line basically goes right through downtown RIC. Literally a 4 inch difference between west and east Henrico. There are basically three sets of solutions at this point.

Euro/NAM: Amped up, further west, drops loads of QPF but definite p-type issues

GFS: Complete opposite, progressive track, 3-6 inches but no p-type issues

GGEM: Dream scenario, central VA jackpot of 12-18 inches

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0Z Euro is now way too close for comfort. Cutoff line basically goes right through downtown RIC. Literally a 4 inch difference between west and east Henrico. There are basically three sets of solutions at this point.

Euro/NAM: Amped up, further west, drops loads of QPF but definite p-type issues

GFS: Complete opposite, progressive track, 3-6 inches but no p-type issues

GGEM: Dream scenario, central VA jackpot of 12-18 inches

 

EURO has been steadfast. GFS playing catchup, and CGEM splits the middle.

 

I think you follow the Euro until short range models come in range,

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DT's first guess has us in the 2-4" then rain area.

Just doesn't look like the storm is sliding far enough east for the big hit.

 

 

I'm waiting until 00Z tonight to formally throw in the white towel.  50-100 miles E and we will be in something half decent.  We've seen that type of movement this late before

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:weenie: Always in the bullseye at this time frame, how many times have we seen it? 

 

I would once, just once, like to see it hold so DC crew could stop saying, exactly where we want it, RIC gets buried...yada, yada, yada.  So next time, they would remember the exception of 2/13/14.

 

Pulling hard for the NAM! :weenie:

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:weenie: Always in the bullseye at this time frame, how many times have we seen it? 

 

I would once, just once, like to see it hold so DC crew could stop saying, exactly where we want it, RIC gets buried...yada, yada, yada.  So next time, they would remember the exception of 2/13/14.

 

Pulling hard for the NAM! :weenie:

 

Been here a ton in 2009 and 2010. Just once, I would love that crew to get stuffed while we score.

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Yeah, we need that one big win.  I am trying to stay positive but I keep remembering like Valentine's Day Weekend storm of 2003.  What did we end up with?  Two inches of snow covered with 4" of sleet? 

 

I was in Harrisonburg for that storm, so it was a monster for me. But yeah, RIC got the dreaded pingers.

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Radar looks decent to the north of HR. Heard a report of snow showers near Richmond. Anybody think we can squeeze out a dusting down here this evening? Its probably our only shot.\

 

Looks like echoes increasing along the VA/NC border west of HR. Hopefully we can get this consolation prize.

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I'm usually averse to asking MBY questions, but since this isn't the main storm thread:  Does anyone know how the 12Z Euro looks for CHO and surrounding environs?  Coverage in storm thread is, as expected, a bit NOVA/DCA-centric.

 

CHO is about 14-16", 8-10" by the time you get to RIC

 

Shenandoah Valley is 18"+, with higher amounts as you go north on 81

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So the 12Z runs didn't do much to clarify things for RIC and the surrounding areas:

 

EURO: Still way amped up, snow to rain with 8-10" (would probably be more like 4-8" to be honest)

GGEM: Moved against us today, no longer a RIC jackpot, but still gives us 10-12"

GFS: Probably the most realistic one to root for, most supressed solution, gives us 10-12" with minimal p-type risks

NAM: Dream scenario, RIC destroyed with 20"+

 

It's really setting up to be an "Americans vs. Europeans" type of deal, which doesn't make me too comfortable given how locked-in the Euro has been on this storm.

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HPC is still dangling the string in front of RIC weenies...

 

 

 

...EASTERN U.S. CYCLONE AND WINTER STORM...

PREFERENCE: BLEND OF 12Z NAM/GFS/UKMET
CONFIDENCE: AVERAGE

ON THE LARGE SCALE A SIGNIFICANT WINTER STORM CERTAINLY APPEARS IN
ALL OF THE OPERATIONAL MODELS. PRECIPITATION IS FOCUSED INITIALLY
ALONG A MID LEVEL FRONTAL ZONE ORIENTED WEST TO EAST. LOW PRESSURE
THEN DEVELOPS ALONG THE GULF COAST BY WEDNESDAY MORNING AND TRACKS
TO JUST OFFSHORE OF THE MID ATLANTIC/DELMARVA TO NEW JERSEY BY
THURSDAY AFTERNOON. ALL OF THE OPERATIONAL SOLUTIONS ARE
PLAUSIBLE...BUT THERE ARE VERY MEANINGFUL STRENGTH/TRACK
DIFFERENCES. OUR PREFERENCE IS BASED ON TRENDS IN SOME OF THE
TIMING/STRENGTH/TRACK DETAILS. THE PAST TWO RUNS OF THE ECMWF HAVE
BEEN ON THE WEST SIDE OF THE TRACK ENVELOPE WHILE ALSO BEING VERY
STRONGLY DEVELOPED WITH THE SURFACE LOW. THE OPERATIONAL MODEL
CONSENSUS IS TOWARD A LOW TRACK THAT IS MORE SUPPRESSED TO THE
SOUTH ACROSS GEORGIA AND ADJACENT STATES ON DAY 2...AND THEN
FARTHER EAST...SLIGHTLY OFFSHORE ON DAY 3. GIVEN THAT THE PARENT
UPPER WAVE IS INITIALLY OF VERY LOW AMPLITUDE AND EMBEDDED IN FAST
ZONAL FLOW...WE PREFER THE NON-ECMWF CONSENSUS. WE OMITTED THE
CANADIAN FROM THIS CONSENSUS AS ITS SOLUTION IS SLIGHTLY FAST.

THE NAM/GFS ARE LIKELY NOT PERFECT...BUT THEY HAVE TRENDED TOWARD
THE ENSEMBLE MEANS...ESPECIALLY FOR TRACK AND TIMING. IT IS WORTH
NOTING THAT THERE IS EVIDENCE FROM MULTIPLE RUNS OF THE ECMWF AND
THE LATEST UKMET...AS WELL AS SEVERAL 12Z GEFS MEMBERS...THAT THE
LOW LEVEL CYCLONE MAY DROP DEEPER THAN THE NAM/GFS SOLUTIONS BY
14/00Z.

AN IMPORTANT NORTHERN STREAM SHORTWAVE HAD NOT YET COME ASHORE
INTO BRITISH COLUMBIA THIS MORNING...SO SOME MARKED TRENDS MAY BE
YET TO COME. THE 12Z NAM/GFS/UKMET...HOWEVER...ARE CONSISTENT WITH
THE CURRENT TRENDS AND ENSEMBLE MEANS...WHICH GIVES US SOME
CONFIDENCE IN RECOMMENDING THEM.
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Latest disco from LWX:

 

.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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