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.

[donsutherland1]

3 hours ago, Jrlg1181 said:

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 ?

 

Yes, it’s a fairly new station.

[WxUSAF]

The anvil top of that storm in northern Frederick county as seen from OCMD

 

[dailylurker]

32 minutes ago, WxUSAF said:

The anvil top of that storm in northern Frederick county as seen from OCMD

 

Really? There's a shower about 70 miles to your NW. That might be what you see. The furthest storm I've seen is about 120 miles. OC to Frederick is far. 

[wxdude64]

JUST missed a 'warm minimum' for the date. 68.7 low, record is 69 from 1986. Currently 71.1/68.9 at 8:10 am. 

[frd]

Rather remarkable, no wonder why so many reports of flooding in the area this past month. This trend looks to continue despite a break or two.       

 

 

[frd]

 

 

Mount Holly states there will be some mixing today during the afternoon hours, so dew points may not reach extreme levels at that time. Presently my DP is  76, very steamy !  Also, seeing some storms form in North central Maryland moving East. 

Worse area appears to be the Delmarva region where it almost reaches heat advisory levels. 

Increasing southwest flow will
usher a warmer and more humid airmass into the region. Highs
today will top off in the upper 80s to around 90. Surface dew
points will generally be in the low to mid 70s, but afternoon
mixing should keep dew points from getting into the upper 70s.
Will blend the CONSALL and NBM guidance for dew points today,
and that will keep dew points from getting as high as the NBM.
Max heat index values will be in the mid to upper 90s, and near
100 in Delmarva, which will be just below Heat Advisory
criteria.

 

[WxUSAF]

29 minutes ago, dailylurker said:

Really? There's a shower about 70 miles to your NW. That might be what you see. The furthest storm I've seen is about 120 miles. OC to Frederick is far. 

I don’t see anything else on radar? It is really far. But that’s the right direction. 

[frd]

31 minutes ago, dailylurker said:

Really? There's a shower about 70 miles to your NW. That might be what you see. The furthest storm I've seen is about 120 miles. OC to Frederick is far. 

Thats crazy, there is a storm as you mentioned to his NW, to me it looks like in North centreal MD moving East. 

[dailylurker]

5 minutes ago, WxUSAF said:

I don’t see anything else on radar? It is really far. But that’s the right direction. 

Their was a dieing heavy shower about 70 miles to your NW. It could be the Carroll County stuff. I was in Easton a few years ago. I could see the anvil from a storm in Central PA. I find that kinds stuff interesting. 

[BlizzardNole]

I'm looking forward to this break in humidity coming up but am smh at how we just went through two weeks of super high precipitable water with only a half inch of rain to show for it.  I just watered the garden and damn the ground is rock hard.  Last real rain was July 1-2, and 0.5 since then.  Now things are really going to get ugly with almost no chance of rain for weeks.

[mappy]

10 hours 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.

Thanks for the hard work with installing those sensors and being a voice to issue the emergency warning! 

[Random Chaos]

Pure steam outside. 93% humidity. Temperature 80.2 dp 78.0.