George BM

Having a high within a few degrees of the record low max temperature for the day while still ahead of a cold front is not something you see very often.

Yeap. Here are some links to that event below: https://glenallenweather.com/alink/18snow/snowmaps2/Great Atlantic coastal snowstorms.pdf https://www.washingtonpost.com/news/capital-weather-gang/wp/2014/04/03/you-wont-believe-how-late-it-snowed-in-d-c-in-colonial-times/

Since record keeping began at DCA (I believe in 1941?) April 13th of 1957 is the latest date for measurable snow there when 0.1" accumulated. However before then, when snowfall was still actually recorded within DC, April 28th of 1898 saw 0.5" of snow (the latest measurable snow in recorded history). Now still before that, in the pre-record era, accumulating snow fell from Northern Virginia through the NE corridor on May 4, 1774 with 4 inches falling in Northern VA and even more falling in places northeast. This was recorded in diaries. However the latest date that DC has ever seen at least a trace of non-measurable snow was on May 10th of 1906.

Eh those are perfectly normal temps for the 9th. Looks like IAD got down to at least 39F this morning. Wait... it's May?.... and not February?! Nevermind. Your statement stands. There's actually a nonzero chance that you may see sprinkles/flurries up your way during the day Saturday.

Also Pivotal Weather. Though recently skew-t soundings went behind a paywall. But there is a lot more free Euro data on Pivotal than any other free ECMWF site that I personally know of.

What is the difference between a 30-min IPA, a 60-min IPA, a 90-min IPA and a 120-min IPA? Do they each have their own effects/taste?

It might be just a tad bit cool for Christmas, actually. But we'll see. We may still warm up a few degrees. 56F at IAD right now as well.

Peanut Butter/Chocolate Protein Bars.

That's what pulled my arm enough for me to make the post about Sundays potential.

For the past several days I've been low-key watching the Sunday system for any severe potential and as of right now late Sunday has slight potential to get interesting should we have enough CAPE (which currently looks modest to perhaps locally moderate with LI of -3 to -5). Deep layer flow looks fairly strong (on the order of 50+ kts in the mid-levels). Should we be able to get enough sunshine for more moderate CAPE it could get interesting for some. Timing does look to be leaning a bit on the later side ATM. Then there is also still the question of how far north this 'threat' will extend. #Notanexpertopinion #Justmy2cents

Social Beering ftw.

Uphill we go slowly but surely. A spongy start.

Not too shabby.

It's the wind that you were denied on April 13th. 60/57 at IAD with a SE wind of 5kts. Light Rain.

Guesstimation of the strength of the wind gusts?

Eggs, Green Leaves, Mushrooms, Meatballs (Pieces?), Cheese. How far off was I?

I just noticed that ECMWF soundings are now behind a paywall on PivotalWx. Wow, what a game changer! Currently the temperature is 50 degrees with light rain/drizzle at IAD.

Yeah that supercell looks nasty. The dbz reflectivity with it was into the upper 70s last hour!

While just about all ensembles have this trough staying over the eastern US for the remainder of the month into the beginning May I wonder if we can get into some W/NW flow action sometime early in May (2nd week?) as the trough slowly lifts and/or shifts eastward (as shown in a number of long range ens. ATM). Just speculation at this point of course... and me thinking out loud.

A pretty decent gust-front just went through Charles Town looking at the radar. What would you guesstimate the strength of the gusts to be?

URGENT - WEATHER MESSAGE National Weather Service Baltimore MD/Washington DC 1140 AM EDT Tue Apr 21 2020 DCZ001-MDZ011-013-014-016>018-504-506-508-VAZ052>057-212345- /O.EXA.KLWX.FZ.W.0005.200422T0600Z-200422T1200Z/ District of Columbia-Southern Baltimore-Prince Georges- Anne Arundel-Charles-St. Marys-Calvert- Central and Southeast Montgomery-Central and Southeast Howard- Southeast Harford-Prince William/Manassas/Manassas Park-Fairfax- Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George- Including the cities of Washington, Baltimore, Bowie, Suitland-Silver Hill, Clinton, College Park, Greenbelt, Laurel, Camp Springs, Glen Burnie, Annapolis, Severn, South Gate, Severna Park, Arnold, Odenton, St. Charles, Waldorf, Lexington Park, California, Chesapeake Beach, Huntingtown, Dunkirk, North Beach, Lusby, Prince Frederick, Bethesda, Rockville, Gaithersburg, Silver Spring, Columbia, Ellicott City, Aberdeen, Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston, Herndon, Annandale, Centreville, Chantilly, McLean, Franconia, Arlington, Alexandria, Falls Church, Falmouth, Fredericksburg, and Dahlgren 1140 AM EDT Tue Apr 21 2020 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM EDT WEDNESDAY... * WHAT...Sub-freezing temperatures near 30 expected. * WHERE...Portions of The District of Columbia, central, northern and southern Maryland and central and northern Virginia. * WHEN...From 2 AM to 8 AM EDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$

The DC metro is now within the SLGT risk. 0% Tornado/ 15% Wind/ 0% Hail

Don't completely sleep on this Tuesday either. There could be some low-topped convection with limited CAPE along and just ahead of the cold front. Steep low-level lapse rates and fairly fast-flow aloft could translate to some of the convection having strong wind gusts.

Down to at least 30F at IAD this morning. Patchy frost.

This shows that we at least have a non-zero severe chance through the end of April.