2026 Mid-Atlantic Severe Storm General Discussion

[Eskimo Joe]

Impressive LSR out of Grafton, WV for that western line "Sustained 35 mph for 5 minutes with gusts to 62 mph."

[MN Transplant]

Bit of initiation happening west of DC from the outflow from the earlier southern storms.

[NorthArlington101]

Bit of initiation happening west of DC from the outflow from the earlier southern storms.

Yep, trying to pop off a bit. Wouldn’t mind a little storm tonight to end the weekend.

[wxmeddler]

Poppin off. Sunset magic hour. Boundary layer decouples and you get a stray gust front (La Plata storm) or subtle s/w aloft and go time.

[Kmlwx]

Garden variety heavy rain in Odenton. 

[Eskimo Joe]

Constant lightning just to my west in Reisterstown. Cats army crawled down to the basement.

[Eskimo Joe]

Interesting radar signature just NW of Sykesville, MD 

[NorthArlington101]

Little bit of lightning in the distance at least. Oh well

[Eskimo Joe]

56 minutes ago, wxmeddler said:

BWER on the E Frederick / W Carroll Cell

 

 

[wxmeddler]

NoVA got skunked. Line to the west is fading. Just showers later I would think.

[Stormchaserchuck1]

Probably my best thunderstorm of the year ongoing

[Eskimo Joe]

That cell in Libertytown/Walkersville appears to have been legit. Some reports of structure damage. . .maybe a tornado?

[snowfan]

Thats quite the cluster from baltimore up into Lancaster co. Impressive amount of lightning. 

[AlexD1990]

Lol apparently this one little part of Virginia is still under the watch...now that's pinpoint forecasting 

[AlexD1990]

Just now, AlexD1990 said:

Lol apparently this one little part of Virginia is still under the watch...now that's pinpoint forecasting 

And also falls Church 

[Eskimo Joe]

Yea definitely looks like a tornado somewhere between Libertytown and New Windsor:

Quote

The Frederick Scanner
9:25 pm: Chief 17 establishing command. Frederick 911 reports possible structure collapse with horse(s) trapped on Bessie Clemson Rd. Requesting ATV/UTV.
9:35 pm: Frederick ECC advises they heard from property owner of the collapsed structure; property owner confirms no horses trapped. Structure is total loss.
9:36 pm: Brush 175 was flagged down by farmer who reports wires down and structural damage.
9:42 pm: Brush 175 reports numerous structures damaged as well as farm equipment rolled over.
9:47 pm: Battalion Chief 902 requesting additional resources to respond to the intersection of Rte. 31 and Bessie Clemson Rd, will disperse resources form that location. Requesting County Highways to respond to assist with clearing debris.

 

[vortex95]

10 hours ago, wxmeddler said:

This is an issue with MADIS. The 83 mph gust is from a sonic anemometer on top of the Bay Bridge. That is the first report. The second 83 mph report in Parole is false, it’s due to a bug that duplicates the Bay Bridge sensor at SHA headquarters in Parole. The lay/lon is wrong in MADIS. The 75 mph gust is from a buoy at the mouth of the Severn.

Are their systematic issues w/ sonic anemometers?   W/ all the new mesonet sites in MD the last few years, are we seeing wind measurement issues often?

[wxmeddler]

22 minutes ago, vortex95 said:

Are their systematic issues w/ sonic anemometers?   W/ all the new mesonet sites in MD the last few years, are we seeing wind measurement issues often?

Sonic Anemometers in general have systematic issues when there is dust / pollen or other particulates in the air. Even rain coming in sideways interferes with the calculations. Which, guess what, is common when there are gust fronts / thunderstorms. Some brands of sonic's have better error rejection than others, but for whatever reason Vaisala's are particularly bad. Which is a shame because it's what both ASOS and many DOT/RWIS networks use.

The "Mesonet" source in the LSR's is a catch all for all different networks including DOT and even some of the PWS stations. It's an issue with the LSR program, there is not enough categories to properly differentiate an actual state mesonet (like MD Mesonet) and a RWIS network like MD SHA's. 

All MD Mesonet sites use traditional propeller anemometers. RM Young 05108's to be exact. MD SHA's RWIS network uses "all-in-one" T/RH/Sonic for reduced maintenance intervals / costs. But they are not good. lol.

[wxdude64]

A few sprinkles adding to the .8-.9" in the gauge from the earlier storm. Looks like MAYBE we get a bit more from the line pushing thru WV in about 45 minutes or so. 

[mappy]

Decent storms last night, picked up .37”

Was watching a left mover up in York County 8-9pm that probably should have be tornado warned well before it actually was. Friend who lives in Stewartstown got hit hard, cell was tornado warned after it passed her but I saw broad rotation on radar well before it hit her.