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April 18 Nor’easter


Weather Will
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6acde95a06219c81cd21fba231ba1a49.jpg
Early morning: neat, I see flakes!

16533c527261b26efe84c6fdc0487778.jpg
Late morning: look at those flakes!

5cf159cffc1532c4172f51175dabaeae.jpg
Afternoon: ugh, guess I’m shoveling one last time.

(A few miles east of Harrisonburg, Massanutten is in the background.)

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Today's storm is just EPO, -EPO with a slight trough over water south of it, it's not even NAO.. NAO is + actually with ridge over northern Europe. I keep saying this. We are getting our best winter storms in +NAO. (I think the issue is a normal -NAO goes +600dm-900dm, to extreme for average kind of a thing). Or it could be the 50/50 low theorem, where you have a low pressure parked to the north

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4 hours ago, SnowenOutThere said:

#perfect track rainstorm (for most of us anyways). 

Do you think some of the further east locations could of gotten something if this happened at 4am instead of near peak sun influence? At the very least the locations getting snow would probably have a couple inches of snow by this point. 

This actually wasn’t a perfect synoptic setup.  The coastal is developing pretty late and tracking on the western edge of what’s likely to produce snow in DC even in winter. The upper low is also tracking further NW than ideal.  
 

However, given the anomalously cold airmass if you transcribe the same setup into winter and it would have been a god storm but still better NW then in the cities. But had the surface low developed a little further south and had this been overnight I think this airmass was anomalously cold to see some slushy accumulation even into the metro areas. Alas it didn’t all come together. Shame because it’s rare to even get the chance to see snow this late. It takes both a rare once a decade type April cold airmass and for a perfect synoptic setup. We got 1 and almost the other. 

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Impressive amounts for mid-April

 

Public Information Statement
Spotter Reports
National Weather Service Baltimore MD/Washington DC
602 PM EDT Mon Apr 18 2022

The following are unofficial observations taken during the past 8
hours for the storm that has been affecting our region. Appreciation
is extended to cooperative and CoCoRaHS observers, Skywarn spotters
and media for these reports. This summary also is available on our
home page at weather.gov/baltimore

********************STORM TOTAL SNOWFALL********************

LOCATION                TOTAL      TIME/DATE  COMMENTS
                     SNOWFALL       MEASURED
                     (inches)

MARYLAND

...Allegany County...
  Frostburg               6.0   220 PM  4/18  Trained Spotter
  Frostburg 2 ESE         6.0   119 PM  4/18  Trained Spotter
  Ridgeley 1 W            5.0   500 PM  4/18  Trained Spotter
  Ridgeley 1 NW           4.8   235 PM  4/18  Trained Spotter
  Cumberland 1 SSE        4.4   200 PM  4/18  Trained Spotter
  Cresaptown  SSW         3.6   200 PM  4/18  Trained Spotter
  La Vale  W              3.0   100 PM  4/18  From MDOT at Lavalle

...Carroll County...
  Manchester 2 NW           T   422 PM  4/18  Trained Spotter

...Frederick County...
  Thurmont 3 N            3.5   500 PM  4/18  NWS Employee
  Middletown 1 SSW        0.2   200 PM  4/18  Trained Spotter

...Garrett County...
  Warnocks 2 NNW          3.0   115 PM  4/18  Trained Spotter
  Grantsville 5 W         2.0   300 PM  4/18  Dept of Highways
  Deer Park 6 NE          1.7   600 PM  4/18  Trained Spotter

...Howard County...
  Marriottsville 2 SSW      T  1100 AM  4/18  NWS Employee
  Scaggsville 1 ENE         T  1112 AM  4/18  NWS Employee
  Columbia                  T  1055 AM  4/18  NWS Employee

...Montgomery County...
  Washington Grove 1 N      T  1118 AM  4/18  Trained Spotter
  Laytonsville 2 WNW        T  1038 AM  4/18  sleet
  Damascus 3 SSW            T   410 PM  4/18  Co-Op Observer
  Gaithersburg 1 WNW        T  1030 AM  4/18  sleet

...Washington County...
  Hancock 1 ESE           3.0   330 PM  4/18  Trained Spotter
  Pecktonville 3 NNW      2.5   310 PM  4/18  NWS Employee
  Sabillasville 2 NNW     2.0   145 PM  4/18  CoCoRaHS
  Boonsboro 3 NNE         1.8   400 PM  4/18  Trained Spotter
  Hagerstown 1 ENE        1.2   400 PM  4/18  CoCoRaHS

VIRGINIA

...Albemarle County...
  Monticello 2 NNE          T   115 PM  4/18  Trained Spotter

...Augusta County...
  Fishersville 1 NE       0.5   125 PM  4/18  Trained Spotter

...Fairfax County...
  Chantilly 2 ENE           T  1100 AM  4/18  Trained Spotter

...Frederick County...
  Hayfield 1 NE           3.5   445 PM  4/18  Trained Spotter
  Cross Junction 1 WSW    3.1   545 PM  4/18  Trained Spotter
  Hayfield 1 N            2.4   130 PM  4/18  Trained Spotter
  Winchester 4 E          1.0   150 PM  4/18  Trained Spotter
  Stephens City 2 E       0.6   200 PM  4/18  Trained Spotter

...Highland County...
  Hightown 3 NW           3.3  1252 PM  4/18  Trained Spotter
  Hightown 3 WNW          2.5   330 PM  4/18  Trained Spotter
  Monterey                2.5   342 PM  4/18  Trained Spotter

...Loudoun County...
  Round Hill 1 WNW        2.9   430 PM  4/18  Trained Spotter
  Purcellville            1.6   330 PM  4/18  NWS Employee
  Hillsboro 3 NW          1.5   330 PM  4/18  Trained Spotter
  Dulles International      T   200 PM  4/18  Airport

...Madison County...
  Big Meadows 1 SSE       6.0   340 PM  4/18  Park/Forest Srvc

...Page County...
  Ida 1 SW                4.0   330 PM  4/18  Trained Spotter
  Honeyville 1 ESE        1.3   230 PM  4/18  Trained Spotter

...Prince William County...
  Woolsey 1 SW              T  1015 AM  4/18  Trained Spotter

...Rappahannock County...
  Chester Gap             5.0   420 PM  4/18  Public
  Sperryville 2 SE        1.0  1152 AM  4/18  Trained Spotter

...Rockingham County...
  Bridgewater 2 E         2.0   200 PM  4/18  Trained Spotter
  Dale Enterprise 1 ES    1.0  1200 PM  4/18  Trained Spotter

...Warren County...
  Karo 1 WSW              1.9   320 PM  4/18  Trained Spotter
  Riverton 1 WNW          1.8   410 PM  4/18  Trained Spotter
  Linden 3 W              0.3  1220 PM  4/18  Trained Spotter

WEST VIRGINIA

...Berkeley County...
  Bunker Hill  SE         3.1   345 PM  4/18  Trained Spotter
  Martinsburg 2 E         3.1   400 PM  4/18  NWS Employee
  Winebrenners Cross 4    2.5   340 PM  4/18  Trained Spotter

...Grant County...
  Mount Storm 2 SSW       5.2   330 PM  4/18  Trained Spotter
  Petersburg              1.0  1138 AM  4/18  Co-Op Observer

...Hardy County...
  Fisher                  3.0   116 PM  4/18  Public

...Jefferson County...
  Bloomery 3 SSE          4.5   435 PM  4/18  Trained Spotter
  Shepherdstown 2 N       1.5   245 PM  4/18  Trained Spotter
  Millville 1 ESE         1.4   402 PM  4/18  Trained Spotter
  Shepherdstown 1 NW      1.2   301 PM  4/18  Trained Spotter

...Mineral County...
  New Creek 3 NW          3.6   300 PM  4/18  Trained Spotter
  Burlington  E           2.5   245 PM  4/18  Trained Spotter
  Keyser                  2.5  1230 PM  4/18  Trained Spotter
  Keyser 2 SSW            2.0  1230 PM  4/18  Co-Op Observer

...Morgan County...
  Smith Crossroads 1 W    5.4   530 PM  4/18  Trained Spotter
  Cherry Run              3.0   300 PM  4/18  Trained Spotter

...Pendleton County...
  Deer Run 2 WSW          3.0   551 PM  4/18  Trained Spotter
  Cherry Grove 6 WSW      2.0  1231 PM  4/18  Trained Spotter
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53 minutes ago, psuhoffman said:

This actually wasn’t a perfect synoptic setup.  The coastal is developing pretty late and tracking on the western edge of what’s likely to produce snow in DC even in winter. The upper low is also tracking further NW than ideal.  
 

However, given the anomalously cold airmass if you transcribe the same setup into winter and it would have been a god storm but still better NW then in the cities. But had the surface low developed a little further south and had this been overnight I think this airmass was anomalously cold to see some slushy accumulation even into the metro areas. Alas it didn’t all come together. Shame because it’s rare to even get the chance to see snow this late. It takes both a rare once a decade type April cold airmass and for a perfect synoptic setup. We got 1 and almost the other. 

Would have been really cool. I was hoping to see some flakes today but no cigar. Interesting that Columbia reported a trace this morning. I thought I might have heard a few sleet pellets against the windows this morning but it wasn't enough to get me up to look. Guessing that's what happened given the Columbia report from earlier.

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I thought it but didn’t say it, but I think LWX was unwise to seemingly disregard the majority of guidance that I had access to. Most showed pretty much exactly what happened out here. I know it’s April, but so do the models.

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