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1/23-24 clipper


Ian

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Exactly. Almost 100 cars crashed into each other in ohio 2 days ago from a snow squall. 1" on frozen roads can be very hazardous here. Much moreso than 3"+ falling @ 34 degrees. 

 

 

yep..RDU has 0.25" a few years back that crippled the region due to timing...morining rush could be nasty somewhere...people in DC drive like idiots

 

gmta

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20z RAP has me starting by 11pm.....and looks pretty good...every model data suggests backbuilding so hopefully there isn't radar suicide early

 

That tail is really interesting. Running hires nam loop shows it even better. Looks like pretty good rates even if they are relatively short lived. Should be fun even if it's only an inch.

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Here's a couple of snippets from a Post article about that 1/18/2000 0.4" disaster:

"Nineteen Prince George's County school buses carrying children homeward were still on the roads at 11:20 pm..."

"Thirty school buses also were stuck in traffic in Montgomery County at 9 p.m...."

"Traffic was still creeping or not moving at all on some major arteries in the city and the Maryland suburbs after 11 last night.....police closed winding East-West Highway between Connecticut and Wisconsin avenues at the height of the crunch. In the District, 20 minute commutes degenerated into multi-hour ordeals. Traffic along Georgia Avenue NW, one of the main routes in and out of the city, was at a standstill for most of the afternoon and evening."

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They kinda have to...its so cold, that if it gets on the roads, they could get icy.

 

ETA...sorry Katie, should have read on further. Didn't mean to be a chorus...

WTH? Actually no they dont. There might be an inch in some spots, but most places that are  in the advisory are forecasted to get a a half inch or less! Read Mount Holly AFD for comparison. Same accums predicted in eastern MD and DE... up to an inch, No advisory. The criteria is 2 inches.

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WTH? Actually no they dont. There might be an inch in some spots, but most places that are  in the advisory are forecasted to get a a half inch or less! Read Mount Holly AFD for comparison. Same accums predicted in eastern MD and DE... up to an inch, No advisory. The criteria is 2 inches.

 

I'm not sure that they still do it, but I'm pretty sure LWX had (has?) rush hour criteria.  It would also explain why the WWA is in the counties of and adjacent to interstate 95.

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Even if they don't with it probably lasting into early rush hour it's a good advisory in my view. 

It's right on their wesbite:

Winter Weather Advisory

A Winter Weather Advisory will be issued when 2 to 4 inches of snow, alone or in combination with sleet and freezing rain, is expected to cause a significant inconvenience, but not serious enough to warrant a warning.

If the event is expected to impact the Baltimore/Washington metro areas during rush hours (4-9 am or 2-7 pm on weekdays) forecasted snow totals of one inch will necessitate the issuance of a winter weather advisory. The snow/sleet criteria for a Winter Weather Advisory for the five westernmost counties (Allegany, Mineral, Grant, Pendleton, and Highland) is higher (3-5 inches).

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It's right on their wesbite:

Winter Weather Advisory

A Winter Weather Advisory will be issued when 2 to 4 inches of snow, alone or in combination with sleet and freezing rain, is expected to cause a significant inconvenience, but not serious enough to warrant a warning.

If the event is expected to impact the Baltimore/Washington metro areas during rush hours (4-9 am or 2-7 pm on weekdays) forecasted snow totals of one inch will necessitate the issuance of a winter weather advisory. The snow/sleet criteria for a Winter Weather Advisory for the five westernmost counties (Allegany, Mineral, Grant, Pendleton, and Highland) is higher (3-5 inches).

 

Good find! 

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I'm not sure that they still do it, but I'm pretty sure LWX had (has?) rush hour criteria.  It would also explain why the WWA is in the counties of and adjacent to interstate 95.

Interesting to see how neighboring offices view things differently. Mount Holly is very matter of fact in their AFD about not posting any advisories due to very low potential to reach the 2 inch criteria. And I dont think anyone is going to think they weren't properly warned if there is a coating of snow on the ground for drive time in the morning.

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Interesting to see how neighboring offices view things differently. Mount Holly is very matter of fact in their AFD about not posting any advisories due to very low potential to reach the 2 inch criteria. And I dont think anyone is going to think they weren't properly warned if there is a coating of snow on the ground for drive time in the morning.

 

That's the tricky part. If roads are gridlocked and riddled with accidents then everyone will hold mt holly accountable for not issuing anything. Doesn't matter how much snow falls. Perception is reality. If weather causes a commuting disaster then # of inches mean squat in the average persons mind. 

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Interesting to see how neighboring offices view things differently. Mount Holly is very matter of fact in their AFD about not posting any advisories due to very low potential to reach the 2 inch criteria. And I dont think anyone is going to think they weren't properly warned if there is a coating of snow on the ground for drive time in the morning.

In the meantime, it still doesn't make sense that PHL has a lower threshold for a WSWarning than DC.

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That's the tricky part. If roads are gridlocked and riddled with accidents then everyone will hold mt holly accountable for not issuing anything. Doesn't matter how much snow falls. Perception is reality. If weather causes a commuting disaster then # of inches mean squat in the average persons mind. 

 

Exactly,  I'd sure put out an advisory.

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