A boundary stalled across northeast Maryland and interacted with the Chesapeake Bay breeze to result in a nearly stationary thunderstorm across Baltimore and Harford counties for much of the late afternoon and evening. Localized rainfall amounts of two to six inches were observed, with instances of flash flooding.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LWX wrote it up.
A boundary stalled across northeast Maryland and interacted with the Chesapeake Bay breeze to result in a nearly stationary thunderstorm across Baltimore and Harford counties for much of the late afternoon and evening. Localized rainfall amounts of two to six inches were observed, with instances of flash flooding.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before the first event at Jun 30, 2:21 PM EST, 2 hours 9 minutes earlier.
Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
321 PM EDT Mon Jun 30 2025
.SYNOPSIS...
A cold front will approach from the northwest on Tuesday, before
moving through Tuesday night into Wednesday morning. High
pressure will build into the region on Thursday and remain in
control through the end of the week.
&&
.NEAR TERM /THROUGH TONIGHT/...
Flood Watch has been issued for parts of the Baltimore and
Washington metro areas until 11 PM for slow moving thunderstorms
that could train and be capable of producing intense rainfall
rates that could cause flash flooding. Careful satellite
analysis shows cumulus congestus forming in between Rt 15 and
I-83. Also, NUCAPS gridded data shows in this area a max of 17C
850 mb dewpoints centered across Frederick County MD into
Gettysburg PA. 12Z HREF max updraft values indicate that
convection could last well through the evening into the
overnight hours. For this reason, Flood Watch has been issued.
Threat for damaging wind gusts remains low due lack of dry air
aloft.
&&
.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
A cold front will enter the area tomorrow and be focus for
widespread showers and thunderstorms. Abundant moisture, strong
instability, and height falls indicate the potential for a very
active afternoon and evening. While the mid-level flow will be
stronger suggesting faster storm motions, the low to mid-level
flow will be somewhat parallel to the sfc boundary which
suggests some training or repeated storms is possible. A larger
Flood Watch will likely be required. Stronger flow aloft and
strong instability also indicate potential for damaging wind
gusts due to wet microbursts. Activity may persist well into the
overnight across southern MD before exiting or dissipating early
Wed.
&&
.LONG TERM /THURSDAY THROUGH MONDAY/...
A weak cold front will drop through the region Thursday bringing
spotty shower or thunderstorm chances to areas west of the Blue
Ridge. Most locations will remain dry with seasonable temperatures
in the mid to upper 80s and low 90s. The humidity will lower even
further behind the front Thursday night into Friday with dewpoints
dropping into the upper 50s and low 60s. The weak front will set us
up for a great July 4th holiday weather wise as well as start to the
holiday weekend. Highs Friday will fall back into the 80s with
dewpoints in the upper 50s and low to mid 60s. Lows Friday night
will fall into the upper 50s and low to mid 60s with urban locations
in the upper 60s. This will make for excellent conditions for
viewing fireworks displays across the region. Similar conditions are
expected Saturday with highs in the mid to upper 80s to around 90 as
1020 mb high pressure sits overhead. The high will slide south and
east of the area Sunday allowing a cold front to approach from the
Ohio River Valley and Great Lakes region. This front will bring
renewed chances for spotty showers and thunderstorms mainly west of
the Blue Ridge for the end of the weekend into the start of next
week. Highs Sunday and Monday will push into the upper 80s and low
90s on southwesterly return flow.
&&
.AVIATION /18Z MONDAY THROUGH SATURDAY/...
Scattered t-storms this afternoon through this evening, then
widespread showers and thunderstorms Tue afternoon and evening.
Potential for training t-storms Tue with potential damaging wind
gusts and torrential rainfall.
VFR conditions are most likely for Wednesday through Saturday with
high pressure nearby.
&&
.MARINE...
SCA conditions developing late tonight across the middle and
southern waters, then spreading across the rest of the waters
Tue ahead and behind a cold front. T-storms may also require
SMWs. SCA conditions may last into Wed morning.
SUb-SCA level winds are expected Wednesday through Saturday as high
pressure builds over the region. A dry cold front will pass through
the area Friday into the start of the holiday weekend.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...Small Craft Advisory from 11 PM this evening to 6 AM EDT
Tuesday for MDZ008.
VA...None.
WV...None.
MARINE...Small Craft Advisory from 11 PM this evening to 6 AM EDT
Tuesday for ANZ530-531-536-538-539.
Small Craft Advisory until 6 AM EDT Tuesday for ANZ532>534-537-
540>543.
&&
SYNOPSIS...LFR
NEAR TERM...LFR
SHORT TERM...LFR
LONG TERM...EST
AVIATION...LFR/EST
MARINE...LFR/ESTHazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 147 PM EDT Mon Jun 30 2025 ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508- VAZ053>057-527-011000- Chesapeake Bay north of Pooles Island MD- Chesapeake Bay from Pooles Island to Sandy Point MD- Chesapeake Bay from Sandy Point to North Beach MD- Chesapeake Bay from North Beach to Drum Point MD- Chesapeake Bay from Drum Point MD to Smith Point VA- Tidal Potomac from Key Bridge to Indian Head MD- Tidal Potomac from Indian Head to Cobb Island MD- Tidal Potomac from Cobb Island MD to Smith Point VA- Patapsco River including Baltimore Harbor- Chester River to Queenstown MD-Eastern Bay- Choptank River to Cambridge MD and the Little Choptank River- Patuxent River to Broomes Island MD- Tangier Sound and the inland waters surrounding Bloodsworth Island-District of Columbia-Cecil-Southern Baltimore- Prince Georges-Anne Arundel-Charles-St. Marys-Calvert- Central and Southeast Montgomery-Central and Southeast Howard- Southeast Harford-Fairfax-Arlington/Falls Church/Alexandria- Stafford-Spotsylvania-King George- Central and Southeast Prince William/Manassas/Manassas Park- 147 PM EDT Mon Jun 30 2025 This Hazardous Weather Outlook is for the Maryland portion of the Chesapeake Bay, Tidal Potomac River, and I-95 corridor through central Maryland, northern Virginia, and District of Columbia. .DAY ONE...This Afternoon and Tonight Scattered to numerous thunderstorms are expected this afternoon into this evening. A few thunderstorms could produce damaging wind gusts and localized flash flooding. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorms are likely on Tuesday afternoon into Tuesday evening as a cold front moves through the region. Some storms may be capable of producing damaging wind gusts and scattered instances of flash flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed on Tuesday. MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508- 526-WVZ050>053-055-011000- Washington-Frederick MD-Carroll-Northern Baltimore- Northwest Montgomery-Northwest Howard-Northwest Harford-Augusta- Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke-Nelson- Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper- Northern Fauquier-Southern Fauquier-Western Loudoun- Eastern Loudoun-Northern Virginia Blue Ridge- Central Virginia Blue Ridge-Northwest Prince William-Hampshire- Morgan-Berkeley-Jefferson-Hardy- 147 PM EDT Mon Jun 30 2025 This Hazardous Weather Outlook is for portions of eastern West Virginia, northern and central Virginia, and central and western Maryland. .DAY ONE...This Afternoon and Tonight Scattered to numerous thunderstorms are expected this afternoon into this evening. A few thunderstorms could produce damaging wind gusts and localized flash flooding. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorms are likely on Tuesday afternoon into Tuesday evening as a cold front moves through the region. Some storms may be capable of producing damaging wind gusts and scattered instances of flash flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed on Tuesday. MDZ501-502-509-510-VAZ503-504-WVZ501>506-011000- Extreme Western Allegany-Central and Eastern Allegany- Western Garrett-Eastern Garrett-Western Highland-Eastern Highland- Western Grant-Eastern Grant-Western Mineral-Eastern Mineral- Western Pendleton-Eastern Pendleton- 147 PM EDT Mon Jun 30 2025 This Hazardous Weather Outlook is for the Allegheny Front counties in western Maryland, eastern West Virginia, and Highland County Virginia. .DAY ONE...This Afternoon and Tonight Scattered to numerous thunderstorms are expected this afternoon into this evening. A few thunderstorms could produce damaging wind gusts and localized flash flooding. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Thunderstorms are likely on Tuesday afternoon into Tuesday evening as a cold front moves through the region. Some storms may be capable of producing damaging wind gusts and isolated instances of flash flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed on Tuesday.
Preliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
305 PM EDT Mon Jun 30 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0710 PM Flash Flood 1 N Winchester 39.19N 78.17W
06/29/2025 Frederick VA Emergency Mngr
Emergency manager reports streets closed due to water
flowing across them at least 12 inches deep. Streets
closed include North Cameron, North Loudoun, and
Whittier Avenue.
&&
Event Number LWX2505771
BELAKPreliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
330 PM EDT Mon Jun 30 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0252 PM Tstm Wnd Dmg 3 W Romney 39.34N 78.82W
06/30/2025 Hampshire WV 911 Call Center
Tree down on 500 block of Middle Ridge Road.
&&
Event Number LWX2505772
BELAKThe Sterling radar (KLWX), 106 km away, was scanning. The volume nearest the first event began at 21:29 UTC.
5 flash flood, 1 flood. Local standard time, as filed.
Three to four inches of flowing across the roadway in several spots along Harford Road between Sunshine Road and Fallston Road.
The 12000 block of Jericho Road was closed due to water flowing across the road.
Belair Road closed due to high water. Water rescue took place near the Fallston Mall.
Hookers Mill Road at Calvary Road closed due to at least 12 inches of water flowing across the road.
Belair Road at Old Joppa Road closed due to high water. North Tollgate Road also closed due to high water. Around one foot of water flowing across the roads.
Philadelphia Road closed due to flooding near Four Seasons Drive, with an ongoing swift water rescue.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2025Every state in 2025This day in weather historyWarnings in Maryland, June 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1259488, 1259479, 1259481, 1259484, 1259485, 1259487.