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November 26-28 Coastal Storm Discussion and Obs


DCAlexandria

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FYI:

 

 

 

000
WWUS41 KLWX 251753
WSWLWX

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1253 PM EST MON NOV 25 2013

MDZ009-VAZ036>040-042-050>053-501-502-260200-
/O.EXB.KLWX.WW.Y.0031.131126T0900Z-131126T1800Z/
MONTGOMERY-NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-LOUDOUN-
ORANGE-CULPEPER-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
NORTHERN FAUQUIER-SOUTHERN FAUQUIER-
INCLUDING THE CITIES OF...GAITHERSBURG...CHARLOTTESVILLE...
WASHINGTON...LEESBURG...CULPEPER...MANASSAS...MANASSAS PARK...
FAIRFAX...WARRENTON
1253 PM EST MON NOV 25 2013

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM TO 1 PM EST
TUESDAY...

THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS
ISSUED A WINTER WEATHER ADVISORY FOR SNOW...SLEET AND FREEZING
RAIN...WHICH IS IN EFFECT FROM 4 AM TO 1 PM EST TUESDAY.

* PRECIPITATION TYPE...PRECIPITATION WILL START AS A BRIEF PERIOD
OF SNOW AND SLEET LATE TONIGHT AND EARLY TUESDAY THEN IS EXPECTED
TO CHANGE TO FREEZING RAIN BY MID MORNING TUESDAY AND CONTINUE
AS FREEZING RAIN INTO EARLY TUESDAY AFTERNOON.

* ACCUMULATIONS...UP TO AN INCH OF SNOW AND SLEET BY EARLY TUESDAY
MORNING FOLLOWED BY AROUND A TENTH OF AN INCH OF FREEZING RAIN
TUESDAY AFTERNOON.

* TIMING...BEGINNING BETWEEN 4 AM AND 6 AM AND CONTINUING INTO
EARLY AFTERNOON TUESDAY.

* TEMPERATURES...IN THE UPPER 20S TONIGHT...MID 30S BY EARLY
TUESDAY AFTERNOON.

* WINDS...NORTHEAST 5 MPH.

* IMPACTS...THE COMBINATION OF SNOW...SLEET AND FREEZING RAIN WILL
PRODUCE SLIPPERY CONDITIONS LATE TONIGHT THROUGH EARLY TUESDAY
AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&
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I doubt we see 50s. Thats always seemed like a reach to me.

i've been skeptical but now all models show it so who knows. i would guess the cold air will fight at least a little since it's hard to scour even in ideal conditions, so would lean east on the zone of warm to cold. 

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i've been skeptical but now all models show it so who knows. i would guess the cold air will fight at least a little since it's hard to scour even in ideal conditions, so would lean east on the zone of warm to cold. 

I am assuming that I-95 will be the battleground for the "cold" and "warm" areas... I could see places like Ashburn being 42 and Waldorf 55

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It seems like the Winter Wx Adv. is the "cover your butts" product from NWS...always in such marginal situations.  Then again it's for parts of DC Area where they can't drive in 65 and partly sunny.

 

I have to laugh at this because it's so true!!  Or seems like it many times.

 

The advisory expanding to the immediate north and western counties outside the District isn't a total surprise.  It may be a "CYA" in part.  However, I recall that the criteria for advisories for times around rush hour in the metro areas were lowered a couple years back with the knowledge that many people on the roads equals a potentially bad situation no matter how little snow or ice falls.  So I don't totally blame LWX for putting that out there, especially with holiday traffic this week, and many people are probably hitting the roads tomorrow.

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I have to laugh at this because it's so true!!  Or seems like it many times.

 

The advisory expanding to the immediate north and western counties outside the District isn't a total surprise.  It may be a "CYA" in part.  However, I recall that the criteria for advisories for times around rush hour in the metro areas were lowered a couple years back with the knowledge that many people on the roads equals a potentially bad situation no matter how little snow or ice falls.  So I don't totally blame LWX for putting that out there, especially with holiday traffic this week, and many people are probably hitting the roads tomorrow.

The holiday traffic is probably a big factor there.

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I believe that is true.  At least for them issuing this so far in advance.  At the same time, if there were no holiday this week I think they'd still probably issue an advisory for early tomorrow, but just probably at a later time.

The advisory for MoCo is for early tomorrow. 4am to 1pm

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