July Discobs 2025

[weatherCCB]

Rain has stopped here.

2.1” in 70 minutes 

[nw baltimore wx]

26 minutes ago, WxUSAF said:

I’m at OCMD today and it seems ok on RadarScope?

 

12 minutes ago, CAPE said:

Its fine on COD.

It is often broken for one reason or another, but not now. NWS radar is garbage, so if you are using that I am not surprised if it doesn't work right lol

I’m at Broadkill Beach and also on RadarScope. There have been a few downpours here today that weren’t on radar. Not a big deal. They must have just been very localized.

[donsutherland1]

College Park picked up an hourly record 2.71".

[Herb@MAWS]

0.40” in today’s late afternoon storm. 
6.37” for July so far. 

[Eskimo Joe]

4 hours ago, rjvanals said:

That 10 foot rise on Sligo Creek is impressive/scary 

That was from one of our county flood sensors near Sligo Creek Pkwy & New Hampshire Ave (MD 650). I've never seen water levels rise that quickly at that location. 

4 hours ago, batmanbrad said:

even more nastiness, yikes:

Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
540 PM EDT Sat Jul 19 2025

DCC001-MDC031-033-VAC059-200015-
/O.CON.KLWX.FF.W.0115.000000T0000Z-250720T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
District of Columbia DC-Montgomery MD-Prince Georges MD-Fairfax
VA-
540 PM EDT Sat Jul 19 2025

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT THIS
EVENING FOR THE NORTHWESTERN DISTRICT OF COLUMBIA AND SOUTHEASTERN
MONTGOMERY, PRINCE GEORGES AND FAIRFAX COUNTIES...

At 540 PM EDT, emergency management reported thunderstorms producing
heavy rain in Emergency management reports water rescues in Takoma
Park and Silver Spring area. Flood sensors on SLigo Creek at SLigo
Creek Parkway and New Hampshire Avenue show a 10 ft rise in 30 mins.
. Between 2 and 3.5 inches of rain have fallen. The expected
rainfall rate is 1 to 2 inches in 30 minutes. Additional rainfall
amounts of 1 to 2 inches are possible in the warned area. Flash
flooding is already occurring.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Emergency management reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Bethesda...                        College Park...
Greenbelt...                       Langley Park...
Beltsville...                      Bladensburg...
Fort Totten...                     American Legion Bridge...
University of Maryland...          Potomac...
North Bethesda...                  Landover...
Hyattsville...                     Takoma Park...
Wolf Trap...                       East Riverdale...
Great Falls...                     Adelphi...
Kemp Mill...                       New Carrollton...

I actually wound up requesting the upgrade to a flash flood emergency. Our flood sensors inside the beltway just went bonkers so fast. Cabin John Branch, Rock Creek, Sligo Creek, and Northwest Branch just started raging in under half an hour. 

4 hours ago, esullivan said:

10 feet rise in Rock Creek park is very scary. The don’t close the inbound roads like Broad Branch (live next to Broad Branch tributary). Nonstop alerts here in DC. I hope everyone is safe in the park. 

This was the worst flash flood event I have ever worked in my entire career. Had this persisted for just another 20 to 30 minutes, we would've had real problems in Montgomery County. The flood sensors we installed, combined with the Layhill and College Park mesonet sites raised alarm bells quickly, which resulted in us getting roads closed and water rescue assets staffed quickly. It was one of the few times in my career that I actually felt helpless as things went sideways.

[SomeguyfromTakomaPark]

Wild pics from takoma park and silver spring.  Sligo parkway was part of the creek today.

[PrinceFrederickWx]

0.97” from the storm tonight, 8.13” for the month so far.

[Jrlg1181]

2 hours ago, donsutherland1 said:

College Park picked up an hourly record 2.71".

Impressive indeed,  but am i reading/understanding that graph wrong ?  Too much work must be  frying my brain - Or too much alcohol after work , Is College Park semi arid...? Is this a new recording station ? 1976 to 2025 ?

 

[Eskimo Joe]

12 minutes ago, SomeguyfromTakomaPark said:

Wild pics from takoma park and silver spring.  Sligo parkway was part of the creek today.

Just went gangbusters. That is one of the most vulnerable watersheds in Montgomery County. Terrain, loose soils and urbanization are tremendous stressors on that waterway. 

[SnowtoRain]

0.71", 4.56" month, 28.55" ytd

[hstorm]

4 hours ago, VA Mad Man said:

DUMPING rain here in Great Falls, VA. Have never seen this type of deluge before here. 

It was incredible. Also have never seen rain like that here. 

[WxWatcher007]

1 hour ago, Eskimo Joe said:

That was from one of our county flood sensors near Sligo Creek Pkwy & New Hampshire Ave (MD 650). I've never seen water levels rise that quickly at that location. 

I actually wound up requesting the upgrade to a flash flood emergency. Our flood sensors inside the beltway just went bonkers so fast. Cabin John Branch, Rock Creek, Sligo Creek, and Northwest Branch just started raging in under half an hour. 

This was the worst flash flood event I have ever worked in my entire career. Had this persisted for just another 20 to 30 minutes, we would've had real problems in Montgomery County. The flood sensors we installed, combined with the Layhill and College Park mesonet sites raised alarm bells quickly, which resulted in us getting roads closed and water rescue assets staffed quickly. It was one of the few times in my career that I actually felt helpless as things went sideways.

And if not for the foresight of installing those sensors in vulnerable areas, you guys may not have been able to respond as quickly as you did. Infrastructure matters.