Tuesday, March 14, 2017

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Is there more, or is this it?
  • INTERMITTENT SNOW SQUALLS into the overnight hours, with light accumulation up to 1/2" possible overnight from central PA to northern MD counties.
  • SQUALLS likely to return mid-morning Wed into afternoon hours, could produce a coating on untreated roads and sidewalks.
  • SIGNIFICANT LATE SEASON COLD AIR (YES, MORE) is set to arrive early next week into next weekend, keeping much of the month's  temperatures below normal. 
  • THREE SYSTEMS TO WATCH next 2 weeks are this Saturday, next Tuesday and the 25th-26th for potential winter weather mischief. See below for 8-14 Day Long Range ideas.

6-10 Day Temperature Outloook: 
NOAA Climate Prediction Center

                                                        

53 comments:
What comes after the Kahuna?
  • INTERMITTENT SNOW SQUALLS into the overnight hours, with light accumulation up to 1/2" possible overnight from central PA to northern MD counties.
  • SQUALLS likely to return mid-morning Wed into afternoon hours, could produce a coating on untreated roads and sidewalks.
  • NEW PULSES OF SIGNIFICANT LATE SEASON COLD AIR are set to arrive early next week into next weekend, keeping much of the month's  temperatures below normal. 
  • THREE SYSTEMS TO WATCH next 2 weeks are this Saturday, next Tuesday and the 25th-26th.

11:00 AM ET 3/14 - PRECIP BELOW PA/MD LINE ENDING BY 2 PM, HEAVY SNOW IN PA CONTINUING THROUGH AFTERNOON. Let us know your precip and road conditions, and here is what we see for the 24 hours ahead:
  • OVERNIGHT.. what happened? A significant push of warm air from the Atlantic worked into the region in the early morning hours, changing snow to sleet and then freezing rain for many areas south of I-70. This cut way into earlier expected snow totals. Computer models and forecasters alike did not identify the potential intensity of this warm air push until after it was showing up on the ground - and hadn't even been showing on the radar. Hence, the "Look Out The Window" model.
  • CURRENTLY, as the Low begins pulling north, cold air is moving into the region on the west side, and will reduce the duration of sleet/freezing rain. However, next 2-3 hours may see intense precipitation rates as 1/2" of liquid or more is working north and west from the Low center.
  • MORNING & AFTERNOON: By 9 AM, we expect all precip to change back over to snow in most areas north of Route 50, with areas south of that over to snow between 9-10 AM. Another 1-2" through 12 PM on top of icy roads and sidewalks will make for treacherous and dangerous travel.
  • OVERNIGHT INTO WEDNESDAY: Temperatures plunge into the teens or low 20s, refreezing over hard any standing water or snow, creating widespread road ice issues for the PM commute and Wed AM as well.
NWS HOURLY FROM TIMONIUM, MD to represent how rest of the day will progress.



Monday, March 13, 2017

Something Wicked This Way Comes

60 comments:
Big Kahuna To Blizzard The Northeast


  • BLIZZARD WARNINGS EXPANDED (RED) TO INCLUDE PHILADELPHIA METRO, EASTERN PA & NORTHERN NEW JERSEY FOR 18-24" 
  • WINTER STORM WARNINGS (PINK) IN EFFECT THIS EVENING THROUGH TUESDAY AFTERNOON. Check your local NWS office for latest official details on current statements. Click Advisory map -->
  • HIGH IMPACT EVENT with multi-hazards. Please refer below to Storm Information Graphic and NOAA Winter Weather Safety graphics.
  • POST-STORM: Sub 20F temps & widespread refreezing of snow melt each morning. 


Current Regional Radar 



National Radar



"Something Wicked This Way Comes..."
-Macbeth, Act 4, Scene 1

UPDATE FROM 3:00 PM SUN 3/12