January 30 2019

Important New Information here as the snow squall line is moving through. The arctic front arriving today is experiencing something called frontogenesis. The development and enhancement of moisture along it. Normally this type would cross the mountains and break up the moisture. But winds ahead of it from the south and southeast are feeding moisture to service the trip over the mountains and actually increase the snow burst. That is why the radar should hold and look more impressive for metro areas.

Doppler Radar at 11:30 AM

This will reach York and Westminster in the next 30 to 60 minutes. I expect it in metro Baltimore before 1 PM

That is also why new warnings have been issued

Snow Squall Warning in Maryland

The National Weather Service in Sterling Virginia has issued a

* Snow Squall Warning for…
Washington County in north central Maryland…
Northwestern Montgomery County in central Maryland…
Frederick County in north central Maryland…
Northwestern Carroll County in north central Maryland…
Loudoun County in northern Virginia…
Northeastern Shenandoah County in northwestern Virginia…
Frederick County in northwestern Virginia…
Northwestern Fauquier County in northern Virginia…
North central Rappahannock County in northwestern Virginia…
Northwestern Prince William County in northern Virginia…
Warren County in northwestern Virginia…
Clarke County in northwestern Virginia…
The City of Winchester in northwestern Virginia…
Jefferson County in the Panhandle of West Virginia…
Eastern Hardy County in eastern West Virginia…
Central Berkeley County in the Panhandle of West Virginia…

* Until 1245 PM EST.

* At 1113 AM EST, a dangerous snow squall was moving through west
central Maryland, easternmost West Virginia, and northwestern
Virginia, moving east at 20 mph.

HAZARD…Whiteout conditions. Zero visibility in heavy snow and
blowing snow. Wind gusts greater than 30 mph.

SOURCE…Radar and webcam indicated.

IMPACT…Dangerous life-threatening travel.

* For those driving on Interstate 70, interstate 81, US highway 15,
and other high speed highways in the warning area, this is
especially dangerous as visibility and temperatures will rapidly
drop. Pavement may become rapidly icy from a small amount of snow
accumulation.

Snow Squall Warning in Pennsylvania

The National Weather Service in State College PA has issued a

* Snow Squall Warning for…
Lancaster County in south central Pennsylvania…
Northumberland County in central Pennsylvania…
Dauphin County in south central Pennsylvania…
Southeastern Franklin County in south central Pennsylvania…
Southeastern Snyder County in central Pennsylvania…
Columbia County in central Pennsylvania…
East central Perry County in south central Pennsylvania…
Cumberland County in south central Pennsylvania…
Schuylkill County in central Pennsylvania…
Adams County in south central Pennsylvania…
York County in south central Pennsylvania…
Montour County in central Pennsylvania…
Eastern Sullivan County in north central Pennsylvania…
Lebanon County in south central Pennsylvania…

* Until 115 PM EST.

* At 1107 AM EST, a dangerous snow squall was located along a line
extending from near Sugar Run to near Rohrsburg to Urban to Boiling
Springs to near Rouzerville, moving east at 35 mph.

HAZARD…Whiteout conditions. Zero visibility in heavy snow and
blowing snow. Wind gusts greater than 30 mph.

SOURCE…Radar and webcams.

IMPACT…Dangerous life-threatening travel.

* For those driving on Interstate 80, this includes areas between the
Limestoneville and Nescopek exits, specifically from mile markers
220 to 247.

This includes the following Interstates…
The Pennsylvania Turnpike from mile markers 219 to 295.
Interstate 78 from mile markers 0 to 8.
Interstate 81 from mile markers 35 to 139.
Interstate 83 from mile markers 0 to 50.
Interstate 283 from mile markers 0 to 2.

Snow Squall Timeline —> slider

This is moving faster than the modeling, so consider these plots perhaps 30 minutes behind schedule.

That brings this into central Maryland between 11:30 AM and 1 PM

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Wind Advisory and Wind Chill Advisory

Temperature Timeline —> slider

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Wind Chill Timeline —> slider

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FITF Gear To Stay Warm

Thursday Morning

It will be dangerously cold. I expect many schools will consider this for delays or cancellations.

Jet Stream Animation

Watch how quickly this lifts away and we being to thaw by Friday and this weekend. The temperature outlook below shows us near 60ºF next week, before cooling down again.

Temperature Outlook