Big Heat (and storms?) Week into July 4th Weekend

[Mrs.J]

Just now, 87storms said:

Judging by radar, Frederick is maintaining its status as a 2026 precip magnet. Good to see. Could have used a storm on top of me while hiking near Lake Mead earlier. Vegas heat is the real deal.

Negative for me. I see the NE pivot happening. Will take my thunder, cool down and 0.01” of precipitation. 

[yoda]

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
612 PM EDT Sat Jul 4 2026

MDC013-021-042245-
/O.CON.KLWX.SV.W.0202.000000T0000Z-260704T2245Z/
Carroll MD-Frederick MD-
612 PM EDT Sat Jul 4 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHWESTERN CARROLL AND NORTHWESTERN FREDERICK COUNTIES IN NORTH
CENTRAL MARYLAND...

At 612 PM EDT, a severe thunderstorm was located near Clover Hill, or
near Frederick, moving northeast at 20 mph.

HAZARD...70 mph wind gusts and ping pong ball size hail.

SOURCE...Radar indicated.

IMPACT...Damaging winds will cause some trees and large branches to
         fall. This could injure those outdoors, as well as damage
         homes and vehicles. Roadways may become blocked by downed
         trees. Localized power outages are possible. Unsecured
         light objects may become projectiles.

Locations impacted include...
Frederick, Thurmont, Emmitsburg, Taneytown, Walkersville, Clover
Hill, Myersville, Woodsboro, Sabillasville, Harney, Bloomfield, New
Midway, Ladiesburg, Utica, Rocky Ridge, Detour, Keysville, Keymar,
Graceham, and Lewistown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature`s leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

[Terpeast]

102.4 for the high imby… and now getting the full split. 

[snowfan]

Seems like 2 distinct Outflow boundaries rn near the metros that could help initiate. 

ETA make that 3.

[WxUSAF]

7 minutes ago, high risk said:

Yeah, I have doubts too, but we need to let this play out.  Some initiation now in Montgomery County.   Outflow boundaries could explode in this environment. 

Storm just popped behind the bay breeze front in northern AA county

[yoda]

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
615 PM EDT Sat Jul 4 2026

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  Northeastern Washington County in north central Maryland...
  Northwestern Carroll County in north central Maryland...
  Northwestern Frederick County in north central Maryland...

* Until 645 PM EDT.

* At 614 PM EDT, a severe thunderstorm was located near Clover Hill,
  or near Thurmont, moving northeast at 20 mph.

THIS IS A DESTRUCTIVE STORM FOR EASTERN WASHINGTON COUNTY MARYLAND
AND NORTHERN FREDERICK COUNTY MARYLAND.

  HAZARD...80 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable damage to trees and power lines. Your
           life is at significant risk if outdoors. In addition to
           some trees falling into homes, wind damage is possible to
           roofs, sheds, open garages, and mobile homes.

* Locations impacted include...
  Thurmont, Emmitsburg, Walkersville, Boonsboro, Smithsburg, Mount
  Aetna, Mount Lena, San Mar, Wolfsville, Myersville, Cavetown,
  Sabillasville, Fort Ritchie, Ringgold, Harney, Utica, Pleasant
  Walk, Rocky Ridge, Highfield, and Graceham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This is an EXTREMELY DANGEROUS SITUATION with tornado like wind
speeds expected. Mobile homes and high profile vehicles are
especially susceptible to winds of this magnitude and may be
overturned. For your protection move to an interior room on the
lowest floor of a building. This storm has the potential to cause
serious injury and significant property damage.

This is an EXTREMELY DANGEROUS SITUATION. This storm is producing
widespread wind damage across eastern Washington County Maryland and
northern Frederick County Maryland. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

[LongRanger]

one of the better Cumulonimbus sightings of my life as an anvil topped cloud moves in from the west

[snowfan]

Thunder. Big Ole fat rain drops.

[NorthArlington101]

Watching storms try to go up from my rooftop between the air show. Due East from the capitol trying to get going.

[87storms]

9 minutes ago, Mrs.J said:

Negative for me. I see the NE pivot happening. Will take my thunder, cool down and 0.01” of precipitation. 

That’s been kind of a theme…northern sections have done a little better this year. I’ve been on the southern edge of several events.

[Wxtrix]

still a lot of cloud to ground bolts and non-stop thunder. 1.3” of rain fell. temps dropped from 100 to 70. 

[yoda]

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

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

0540 PM     Tstm Wnd Dmg     Charles Town            39.29N  77.86W
07/04/2026                   Jefferson          WV   911 Call Center

            Multiple reports of trees down across Jefferson County.
            Several towns with damage.

[yoda]

Augusta County has numerous trees down and numerous road closures due to damage

[SnowenOutThere]

Looks like a boundary collision is about to take place across louden and Fairfax county. 

[yoda]

@WxUSAF

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
627 PM EDT Sat Jul 4 2026

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for...
  Central Howard County in central Maryland...
  Central Montgomery County in central Maryland...

* Until 715 PM EDT.

* At 627 PM EDT, a severe thunderstorm was located over Montgomery
  Village, or over Gaithersburg, moving northeast at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damaging winds will cause some trees and large branches
           to fall. This could injure those outdoors, as well as
           damage homes and vehicles. Roadways may become blocked by
           downed trees. Localized power outages are possible.
           Unsecured light objects may become projectiles.

* Locations impacted include...
  Columbia, Germantown, Rockville, Gaithersburg, Olney, Damascus,
  Historic Ellicott City, Ellicott City, Aspen Hill, Montgomery
  Village, Redland, Clarksburg, Derwood, Highland, Washington Grove,
  Laytonsville, Brookeville, Clarksville, West Friendship, and
  Ashton.

[Bubbler86]

Gust of 68 in Pen Mar.  Dry as a bone though. 

[Jrlg1181]

14 minutes ago, stormy said:

.75" so far.  Temp. down to 70.

Up to 0.38 now - very intense rain for about 10 minutes... We are so close yet so far away when it comes to convective rainfall.... I realized the first year after moving here from Crozet that the NW corner of Waynesboro is usually gonna be in a convective rainfall minimum when compared to the rest of Waynesboro/eastern Augusta..

[TJ3]

30 minutes ago, yoda said:

102/66 at 6pm at DCA

I know life threatening storms are going on.     But WTF 

[MDphotog]

Well that sucks. No rain yet, but did get 15mins of sustained winds that managed to knock the power out..again. Thankfully it at least dropped the temps down to around 80


.

[WxUSAF]

That specific cell will miss MBY northwest @yoda but stuff is popping so we’ll see

[dailylurker]

That little cell to my nw is rocking. Non stop rolling thunder coming from that thing. I'm starting to hear it coming from my sw from that cell that's popping up on the east side of the DC beltway. LFG!

[pazzo83]

2 minutes ago, TJ3 said:

I know life threatening storms are going on.     But WTF 

only 2nd time ever (last time in 1930) that DC has had three straight days of 102.

[biodhokie]

Storm that cropped up in Gaithersburg, definitely dropping lightening as if Zeus was angry at the town. Had at least two strikes that were instantaneous lightening/thunder. Also had good size branches fall...have to wait until it passes to see if it damaged the car.

[LordBaltimore]

Iridescent pileus near lakeshore md

[WxUSAF]

7 minutes ago, dailylurker said:

That little cell to my nw is rocking. Non stop rolling thunder coming from that thing. I'm starting to hear it coming from my sw from that cell that's popping up on the east side of the DC beltway. LFG!

Just had lightning and thunder in Greenbelt 

[Chris78]

14 minutes ago, Bubbler86 said:

Gust of 68 in Pen Mar.  Dry as a bone though. 

Pending rain right now just south of you 

[birdsofprey02]

Weird radar hole/hook thing I caught on image a few minutes ago. 

[Bubbler86]

3 minutes ago, Chris78 said:

Pending rain right now just south of you 

Yep, it is pouring.  Backing building extreme.  Love it. 

[wxmeddler]

1 minute ago, birdsofprey02 said:

Weird radar hole/hook thing I caught on image a few minutes ago. 

This looks like a smoothing artifact of whatever visualizer they are using.

[yoda]

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

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

0623 PM     Marine Tstm Wind 2 WSW Tompkinsville     38.31N  76.93W
07/04/2026  M75 mph          Charles            MD   Mesonet

            Wind gusts of up to 65 knots (75 MPH) were measured by
            the Cuckold Creek WeatherFlow sensor (XCCK) between 6:23
            and 6:33 PM.