Big Heat Week into July 4th Weekend

[Eskimo Joe]

Prince Anne mesonet site running a heat index of 117°...looks like we lost a degree or two on the dewpoints but that's allowing air temps to get higher?

[yoda]

57 minutes ago, yoda said:

1pm temps

DCA 100

BWI 101

IAD 96

RIC 97

CHO 99

SBY 99

2pm

DCA 100

BWI 101

IAD 97

RIC 99

CHO 101

SBY 100

[Eskimo Joe]

Federalsburg mesonet site hits 102°. Pending QA, this sets an all time record high air temperature for the mesonet.

[snowfan]

[Eskimo Joe]

Sterling about to go into warning mode. That cell SW of Culpepper is going up quick.

[Eskimo Joe]

Luray (LUA) and Warrenton (HWY) both hit 100°

Charlottesville (CHO) and Louisa (LKU) both hit 101°

[Eskimo Joe]

Westminster (DMW) and the Inner Harbor (DMH) both hit 102°

[batmanbrad]

14 minutes ago, Eskimo Joe said:

Sterling about to go into warning mode. That cell SW of Culpepper is going up quick.

it's got some hail potential according to RadarScope, and it isn't moving very fast either so training and potential flood issues are there if the cell maintains itself.

[Eskimo Joe]

Based off mesonet and ASOS data, there appears to be a surface boundary running right along I-97 in Anne Arundel County. Might see something fire up or get enhanced by that later on.

[dailylurker]

It's been 100 here for the past hour. Yesterday I hit 103. I might be close again today. 

[Kay]

43 minutes ago, Eskimo Joe said:

Any objections to posting the storms and heat obs into this thread for at least today?

+1

[CAPE]

A legit 100 today. 100.3

No rounding!

[Eskimo Joe]

Naval academy (NAK) getting the worst of both worlds right now. A faint bay breeze that's enough to push in more humid air, but too weak to cool things off. They're 95/76 right now for a heat index of 108°.

[Eskimo Joe]

Fort Belvoir (DAA) and Lake Anna/Bumpass (7W4), and Fredericksburg (EZF) all hit 100°. We definitely seem to be running just a degree or two warmer today in the air temperature department.

[Eskimo Joe]

Impressive 18z sounding from IAD:

• Surface CAPE of ~3,100
• DCAPE of ~1,400
• Lapse rage of -8.4°c/km

Classic robust wet microburst sounding.

One red flag for more widespread convection is the convective temp of 100° and a 700mb temp of almost 11°, which is still pretty capped. If we get shielded over with cirrus, then we might lose the oompf needed to get the more robust cluster and line segments going.

[stormy]

Temp. dropped from 95 to 84 in a thundershower that dropped .07" rain.

[George BM]

1 minute ago, Eskimo Joe said:

Impressive 18z sounding from IAD:

• Surface CAPE of ~3,100
• DCAPE of ~1,400
• Lapse rage of -8.4°c/km

Classic robust wet microburst sounding.

One red flag for more widespread convection is the convective temp of 100° and a 700mb temp of almost 11°, which is still pretty capped. If we get shielded over with cirrus, then we might lose the oompf needed to get the more robust cluster and line segments going.

Picturized.

[Terpeast]

101.5 again today. Still a bit of time to beat that before convection begins. 

[Eskimo Joe]

Impressive LSR for that warned cell which collapsed just to the southwest of Luray. Classic microburst:

Quote

Preliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
303 PM EDT Sat Jul 04 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0245 PM     Tstm Wnd Dmg     3 SE Broadway           38.57N  78.76W
07/04/2026                   Rockingham         VA   911 Call Center 

            Several trees and wires blew down near Broadway. A 
            large tree blew down in the 12000 block of Daphna Road. 
            A couple of large trees blew down on US-11 Lee 
            Highway/North Valley Pike near Lacey Spring Road to the 
            11000 block. Trees and wires blew down near the 
            intersection of Wampler Road and Holsinger Road, and in 
            the 2500 block of Mayland Road. 


&&

Event Number LWX2606986

 

[Eskimo Joe]

Wow Inner Harbor (DMH) spikes to 104°

Frederick (FDK) hits 100°

[Mrs.J]

101/72/112

Was out briefly breeze makes it not feel quite as thick humidity wise. 

[WxUSAF]

Hard to be 100% sure with all the ground clutter on radar, but looks like there’s a bay breeze boundary in southern AA and Calvert counties.

[Eskimo Joe]

3 minutes ago, WxUSAF said:

Hard to be 100% sure with all the ground clutter on radar, but looks like there’s a bay breeze boundary in southern AA and Calvert counties.

Agreed. Was mentioning this earlier. You can see that on the Naval Academy, BWI, Ft. Meade and PG mesonet sites. Looks like it's running right along I-97.

[Bubbler86]

1 hour ago, Kay said:

 

Thanks for the term. I had never seen, or noticed, one in that posture but guessed why. I have more water out now. Hot enough in Pen Mar for panting chickens, ugh!

Low 80, currently 94/76

We were just in Leitersburg where we spent $25 for tickets and $45 in food and the beer wall to find out what the big disclosure from Disclosure day was.

They have a little weather station at the theatre and it is a sweet 103.  Car therm confirmed.

The chickens are staying confined to under bushes and trees right now.   I am glad this nonsense is coming to an end soon.  Need rain badly. 

 

 

[Eskimo Joe]

Easton (ESN) hits 100°

[Eskimo Joe]

Cell SW of Culpepper pushing 50,000 feet there's your Big Boy!

[Eskimo Joe]

College Park (CGS) hits 101°

Salisbury (SBY) hits 102°

[IronTy]

Heat wave 2026 is over here at DCL.  Clouded over with tons of thunder non-stop.  First storm went barely to our north but the outflow really cooled us down and more storms are incoming.  We've dropped into the low 70s.  

[SnowtoRain]

101.5 on the pws. Looks like Delmarva maxed the heat today, a few 104 and 105s in Delaware per DEOS

[Terpeast]

Higher high at 102 than yesterday, but peak HI a bit lower at 114