Big Heat Week into July 4th Weekend

[BlizzardNole]

Starting out at 80/74.  In one part of Solomons, there's a huge cornfield right on the water.  That local humidity must get fun

[JakkelWx]

81/76 after a low of 78

[GramaxRefugee]

Just lost power off and on. BGE starting their high demand games. 

77/76 right now. Starting from low of 76 I forecast our high to be about 96.

[Eskimo Joe]

The Baltimore City mesonet site, located on 12 acres of grass at the Montebello Water Treatment plant, already has a heat index of 91° and an air temperature in the mid 80s.

[nj2va]

79 for the low. 
 

Currently 86/77 HI 97. Absolutely stifling outside 

[TSSN+]

It’s hazy as hell this morning 

[DDweatherman]

84 degrees at the new stomping grounds in Taneytown/Bridgeport area. HI 95 at 8am… ouch

[Eskimo Joe]

11 hours ago, Jebman said:

You should not have dewpoints at 79 degrees. You are way too far north for this. Those are conditions for the Gulf Coast or places like Buda, Texas where I live. I've been out in this all spring/early summer. I'm used to it.

Chesapeake Bay baby. 

[TSSN+]

On my way to work passing thru Frederick. Car reads 89 nearby stations confirm it nasty out. 

[stormy]

My low was 65.2 this morning.    High yesterday was 98.  A little too cool for the record which was 99 in 1959.

[Herb@MAWS]

Thursday low imby/Columbia 79.9°

[SolidIcewx]

86/76/96 where i am. I think a lot of us will be 90 by 10-1030.

[SouthboundYank]

31 minutes ago, nj2va said:

79 for the low. 

Currently 86/77 HI 97. Absolutely stifling outside 

Currently 81/70 here in MB. But c'mon, man..."stifling?" You Alexandrians are beastly PROS at handling triple-digit heat in summer...   

[George BM]

Currently 87/75 at IAD 8:44am EDT.

[yoda]

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
836 AM EDT Thu Jul 2 2026

DCZ001-MDZ004>006-008-011-013-014-016>018-503>508-VAZ037>040-050-051-
053>057-501-502-505-506-526-527-022100-
/O.NEW.KLWX.XH.A.0002.260704T1400Z-260705T0000Z/
/O.CON.KLWX.XH.W.0002.260702T1400Z-260703T0000Z/
/O.CON.KLWX.XH.W.0003.260703T1400Z-260704T0000Z/
District of Columbia-Frederick-Carroll-Northern Baltimore-Cecil-
Southern Baltimore-Prince Georges-Anne Arundel-Charles-St. Marys-
Calvert-Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Southeast Harford-Albemarle-Greene-Madison-Rappahannock-Orange-
Culpeper-Fairfax-Arlington/Falls Church/Alexandria-Stafford-
Spotsylvania-King George-Northern Fauquier-Southern Fauquier-
Western Loudoun-Eastern Loudoun-Northwest Prince William-Central
and Southeast Prince William/Manassas/Manassas Park-
836 AM EDT Thu Jul 2 2026

...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 10 AM TO 8 PM EDT
FRIDAY...
...EXTREME HEAT WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

* WHAT...For the first Extreme Heat Warning, dangerously hot
  conditions with heat index values up to 111 expected. For the
  second Extreme Heat Warning, dangerously hot conditions with heat
  index values up to 112 expected. For the Extreme Heat Watch,
  dangerously hot conditions with heat index values up to 110
  possible.

* WHERE...Portions of DC, central, north central, northeast,
  northern, and southern Maryland, and central, northern, and
  northwest Virginia.

* WHEN...For the first Extreme Heat Warning, until 8 PM EDT this
  evening. For the second Extreme Heat Warning, from 10 AM to 8 PM
  EDT Friday. For the Extreme Heat Watch, from Saturday morning
  through Saturday evening.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat and high humidity events.

 

[pazzo83]

3 minutes ago, George BM said:

Currently 87/75 at IAD 8:44am EDT.

DCA at 88/75.  Yikes.

[WxUSAF]

4 minutes ago, George BM said:

Currently 87/75 at IAD 8:44am EDT.

 

1 minute ago, pazzo83 said:

DCA at 88/75.  Yikes.

Hundo plus here we come

[Mrs.J]

37 minutes ago, TSSN+ said:

On my way to work passing thru Frederick. Car reads 89 nearby stations confirm it nasty out. 

That would be correct. And my station is in shade. 

[winter_warlock]

87.3 here at 8 53 am heat index at 96!!!       Where I work( welding shop)  just absorbs heat.  Inside the shop it 114!!!   The sun just bakes when it  shines on the steel roof. 

[WEATHER53]

76 for my low 

[CAPE]

From Mount Holly AFD this morning-

DISCUSSION...
KEY MESSAGE 1...Dangerous heat and humidity will build across
the region through Saturday. All time record high temperatures
could be challenged today and Friday with widespread triple
digit temperatures.

Strong mid-level ridging across the Mississippi Valley, Great
Lakes, and Ohio Valleys is building eastward into the Northeast
and Mid Atlantic and will persist into the holiday weekend. A
west to southwest flow will shift more west to northwest by
Friday. The ridge will finally start to break and retreat some
starting Saturday into Sunday.

High temperatures are forecast to range between 100 to 105
degrees in most areas today and Friday. The shift to a more
west to northwest flow aloft will allow for better mixing out
of dewpoints during the afternoon, and also a component of
downsloping (adiabatic warming) from the Appalachians. This
phenomenon should be a little stronger on Friday with low level
flow being slightly stronger, but regardless dewpoint should
still mix out a fair amount this afternoon. This setup will
support temperatures climbing above 100 degrees across most non
mountainous inland areas as dewpoints mix out into the mid to
upper 60s during the afternoon hours. Resulting forecast heat
indices are mostly in the 105-110 degree range, though localized
values upwards of 115 degrees are possible if dewpoints stay
closer to 70 degrees.

This is indeed the type of synoptic pattern that could
challenge all time record high temperatures in our region. Areas
north of I-78 are forecast to experience the hottest air
temperatures (upper 90s to near 100 degrees, even as high as 95
degrees at Mount Pocono) today. Further south, the hottest air
temperatures (mainly in the 100-105 degree range, and in the
upper 90s to near 100 degrees for the New Jersey Shore and
Delaware Beaches) are forecast to occur on Friday.

[MN Transplant]

9am temps.  

• DCA: 88
• IAD: 87
• BWI: 89
• 88.3 at home

 

[JakkelWx]

87/78 as of 9 AM

[Ephesians2]

1 minute ago, MN Transplant said:

9am temps.  

• DCA: 88
• IAD: 87
• BWI: 89
• 88.3 at home

 

Do you know if there's a similar map for VA? Thank you! 

[SolidIcewx]

89/76/100 outside of Laurel MD. Today and tomorrow gonna be a special one

[Eskimo Joe]

12z IAD sounding shows warmer temps today at 700mb, now +12°. We're probably capped against any thunderstorm chances outside some rogue surface boundary like a sea breeze, etc.

[yoda]

DCA reached 90 degrees at 855am... I'm thinking 103 today for a high temperature 

https://www.weather.gov/wrh/timeseries?site=kdca

 

[Eskimo Joe]

5 minutes ago, Ephesians2 said:

Do you know if there's a similar map for VA? Thank you! 

Unfortunately, Virginia does not have a statewide mesonet.

[Eskimo Joe]

1 minute ago, yoda said:

DCA reached 90 degrees at 855am... I'm thinking 103 today

IAD and BWI are probably a lock. DCA will always be heavily dependent on a river wind. That being said, I would tend to agree with you.

[TSSN+]

1 minute ago, yoda said:

DCA reached 90 degrees at 855am

100+ should happen unless it clouds up at all.