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March 7th Potential Freezing Rain Event


NorthArlington101

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Some advisories in the counties just to my south and west. Would not be shocked if the Mountains end up with 3-6 and 1-2 Foothills here.

Think I'll be on western edge this time, looking for an inch or so. I can see someone in ROA to Boone line jackpotting close to those numbers though.

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Think I'll be on western edge this time, looking for an inch or so. I can see someone in ROA to Boone line jackpotting close to those numbers though.

 

 

Yeah, profiles are sleety on the nam--- I imagine the MTS are snow  for a while, well-- because they always are. 

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NAM has been very consistent with very light freezing drizzle or snow for the Friday morning commute.   If it's right, and if freezing drizzle is the dominant type, the temperatures progged in the 27-29 range could cause a lot of problems.

 

I did see a mention from the LWX in the morning AFD that they didnt think that the precip would make it up here

 

WE ARE CURRENTLY ADVERTISING THE POTENTIAL FOR A LIGHT WINTRY

MIX...INCLUDING THE THREAT OF LIGHT ICE ACCUMULATIONS FROM

FREEZING RAIN OR DRIZZLE. WILL WAIT TO ANALYZE THE 12Z GUIDANCE

BEFORE MAKING ANY RADICAL CHANGES BUT AM SKEPTICAL OF PRECIP

MAKING IT AS FAR NORTH AS THE CWA...ESPECIALLY NORTH OF CHO-NHK

WITH LIFT AND MOISTURE POTENTIALLY BEING TOO SHALLOW TO OVERCOME

THE DRY AIRMASS THAT HAS ALREADY BEEN ESTABLISHED. EARLIER MODELS

HAVE ALREADY VERIFIED TOO HIGH WITH SFC DEWPOINTS.

 

Did the 12z runs change that thinking?

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I did see a mention from the LWX in the morning AFD that they didnt think that the precip would make it up here

 

 

 

 

Did the 12z runs change that thinking?

nam is fairly bullish on getting precip into much of the area (largely after temps are above freezing) but the other models are not. how comfortable are we in the nam scoring a coup? 

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nam is fairly bullish on getting precip into much of the area (largely after temps are above freezing) but the other models are not. how comfortable are we in the nam scoring a coup? 

 

     it's an interesting situation:  The NAM precip for the rush hour is way out ahead of the main precip shield associated with the sfc low.   It's extremely light - it doesn't show up on any precip plot using 0.01" as the starting contour, but it does show up in the bufr data.  LWX may be right that it's too dry here to saturate the low levels early tomorrow, but I'm a little concerned that it has been there in just about every NAM run for a couple of days now.

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WPC hatin' on the NAM

 

DEEP CYCLONE MOVING OUT OF THE SOUTHEAST FRI NIGHT
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
PREFERENCE: NON-NAM COMPROMISE
CONFIDENCE: AVERAGE

THE 12Z NAM CONTINUES TO BE THE SLOWEST PIECE OF GUIDANCE WITH
THIS SYSTEM'S PROGRESSION, WHILE THE 12Z GFS IS ONE OF THE QUICKER
SOLUTIONS. WHILE THE 12Z GFS SHOWS SIGNS OF CONVECTIVE/GRIDSCALE
FEEDBACK. THE SURFACE LOW DOES HAVE ASSOCIATED CONVECTION IN ITS
VICINITY, SO IT MAY NOT BE THAT FAR OFF BASE -- TRENDS IN THE
CANADIAN/UKMET SINCE THEIR 00Z RUN INDICATE A QUICKENING TREND.
AS THE NAM IS TRENDING QUICKER AS WELL, AND THAT THE SYSTEM SHOULD
BE PICKING UP THE PACE OF ITS PROGRESSION SOUTH OF THE APPROACHING
QUASI-ZONAL NORTHERN STREAM, BELIEVE THE NAM IS TOO SLOW. THE
PREFERENCE IS FOR A NON-NAM COMPROMISE WITH AVERAGE CONFIDENCE
CONSIDERING THE LINGERING DETAIL ISSUES SEEN IN THE GUIDANCE. SEE
WPC WINTER WEATHER AND QPF DISCUSSIONS FOR THOUGHTS ON
PRECIPITATION TYPE AND AMOUNTS EXPECTED WITH THIS SYSTEM.
 

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