Monday January 28 2019
The arctic blast on the way is being led by a little storm system. Each update from the computer modeling shows this speeding up and enhancing Low Pressure forming over our region ahead of the arctic air. There is one model I have been showing you that has been most aggressive with the front end. I can’t ignore it and need to share that information with you. If this verifies, then some snow and ice could be a problem Tuesday morning for northern areas. Metro areas are on the fence for the morning. But if there is and early hit, should thaw mid day. Northern counties should remain below freezing all day.
The arctic front will be responsible for all of our area to change to snow during the afternoon and evening. Then we are set up for flash freeze on the roads. This will be followed by the arctic blast. The coldest air this round will be with us Thursday morning.
Click here to see: Winter Weather Advisories added after this post.
Biggest Tuesday Weather Concerns:
- Morning: Worth watching for snow or ice near and north of the city. Timing would bring this in 3 AM to 6 AM.
- Noon: Some warming late morning in Central Maryland where roads should be wet. The change to snow will occur (noon to 2 PM) before temps drop below freezing. So wet roads will eventually get stickage and turn icy.
- Afternoon/Evening: Annapolis to Eastern Shore change to snow after 3 PM. Roads turn icy for the evening.
UPDATE: Winter Weather Advisory for southern PA 1 AM Tue to 1 Am Wed. This is for Adams, York, and Lancaster Counties. Their NWS Office is State College PA.
Central MD is under another office and we should get this expanded from them shortly
Snow and Ice Timeline —> slider
- This NAM 3 Km Model is the most aggressive with the morning snow and ice.
- I could not ignore the potential for morning snow despite other models not showing a morning impact. This is with watching since this model has performed well in recent events.
Afternoon Snow Timeline —> slider
There will be some morning snow in the mountains. But the developing situation will be over our central are to the Delmarva.
- Most likely to have morning impact, stay near or below freezing all day, and have the most snow.
- Snow Totals: 2 to 4 inches. There is potential for some higher amounts.
- Marginal risk for morning issue on the roads.
- Thaw mid day, then change to snow between noon and 4 PM
- Snow Totals: 2 to 3 inches
- No morning weather problems
- Change to snow after 4 PM
- Wet roads will get stickage and turn icy of the evening
- Snow Totals: Up to 2 inches
Where is the Winter Weather Advisory?
Good question. That comes from the National Weather Service. I only pass that along when they issue it. I expect it will be posted this afternoon. Usually there should be a 24 hour window to alert the public.
I expect at least Zone A on my map will get an advisory. Zone B should, but a later time frame. Perhaps Zone C for Tuesday evening.
Zones A and B are best positioned for Wind Chill Advisory Wednesday night into Thursday morning.
The NWS Baltimore/Washington Forecast Map
This matches my forecast.
(If your area is not on this map, you are under a different NWS Office jurisdiction)
NWS Impact Map: Experimental Graphic
This shows the moderate impact where temps stay below freezing all day in southern PA. However, I think this should include Northern Frederick to Carroll County, and the Hereford Zone.
Will We See Record Cold?
Let’s first take a look at some climate date for Baltimore at BWI for next week:
January 30 (Wed):
42ºF = Normal High; 25ºF = Normal Low
16ºF in 1966 = Record Cold Max Temperature *(likely to be a little higher than this)
-4ºF in 1873 = Record Min Temperature *(should not reach this level)
January 31 (Thur):
42ºF = Normal High; 25ºF = Normal Low
22ºF in 1948 = Record Cold Max Temperature *(Chance to break this)
+4ºF in 1966 = Record Min Temperature *(Chance to break this)
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