4 products issued by NWS for: Herndon VA
Hazardous Weather Outlook
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 533 PM EDT Wed Jul 16 2025 ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508- VAZ053>057-527-172145- 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- 533 PM EDT Wed Jul 16 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...Tonight A Flood Watch for potential flash flooding is in effect for much of the area excluding southern Maryland and the Fredericksburg area through midnight tonight. A few severe storms with damaging wind gusts are possible this evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday A Heat Advisory is in effect from 11 AM until 8 PM Thursday for much of the area. .SPOTTER INFORMATION STATEMENT... Please relay any flood or severe thunderstorm reports to the National Weather Service. $$
Severe Thunderstorm Warning
Severe Thunderstorm Warning
VAC059-061-107-153-683-170015-
/O.NEW.KLWX.SV.W.0306.250716T2347Z-250717T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
747 PM EDT Wed Jul 16 2025
The National Weather Service in Sterling Virginia has issued a
* Severe Thunderstorm Warning for...
South central Loudoun County in northern Virginia...
West central Fairfax County in northern Virginia...
Northeastern Fauquier County in northern Virginia...
Northwestern Prince William County in northern Virginia...
The northwestern City of Manassas in northern Virginia...
* Until 815 PM EDT.
* At 747 PM EDT, a severe thunderstorm was located near The Plains,
or near Warrenton, moving east at 35 mph.
HAZARD...60 mph wind gusts and quarter 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...
Linton Hall, Bull Run, Haymarket, The Plains, Sudley, Gainesville,
New Baltimore, Marshall, Catharpin, Woolsey, Meadowville, Halfway,
Airlie, Broad Run, and Ada.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail, damaging wind, and continuous cloud to ground lightning
are 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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3874 7788 3886 7793 3897 7757 3877 7749
TIME...MOT...LOC 2347Z 258DEG 29KT 3882 7780
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Belak
Flood Watch
Flood Watch
National Weather Service Baltimore MD/Washington DC
519 PM EDT Wed Jul 16 2025
DCZ001-MDZ004>006-008-011-013-014-503>508-VAZ036>040-051-053-054-501-
502-505-506-526-527-170400-
/O.CON.KLWX.FA.A.0028.000000T0000Z-250717T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Cecil-Southern Baltimore-Prince Georges-Anne Arundel-Northwest
Montgomery-Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-Northwest Harford-Southeast Harford-
Nelson-Albemarle-Greene-Madison-Rappahannock-Culpeper-Fairfax-
Arlington/Falls Church/Alexandria-Northern Fauquier-Southern
Fauquier-Western Loudoun-Eastern Loudoun-Northwest Prince William-
Central and Southeast Prince William/Manassas/Manassas Park-
519 PM EDT Wed Jul 16 2025
...FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.
* WHERE...Washington DC, and portions of Maryland, including the
following areas, Anne Arundel, Carroll, Cecil, Central and
Southeast Howard, Central and Southeast Montgomery, Frederick MD,
Northern Baltimore, Northwest Harford, Northwest Howard, Northwest
Montgomery, Prince Georges, Southeast Harford and Southern
Baltimore, and Virginia, including the following areas, Albemarle,
Arlington/Falls Church/Alexandria, Central and Southeast Prince
William/Manassas/Manassas Park, Culpeper, Eastern Loudoun,
Fairfax, Greene, Madison, Nelson, Northern Fauquier, Northwest
Prince William, Rappahannock, Southern Fauquier and Western
Loudoun.
* WHEN...Until midnight EDT tonight.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- Showers and thunderstorms will move across the area this
evening. Storms will be capable of producing very heavy
rainfall, with 1 to 3 inches possible in an hour where
stationary cells or multiple rounds occur.
Localized maximum rainfall of 2 to 4 inches is possible.
- Please visit www.weather.gov/safety/flood for flood safety
and preparedness information.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
&&
$$
ADS
Heat Advisory
URGENT - WEATHER MESSAGE National Weather Service Baltimore MD/Washington DC 439 PM EDT Wed Jul 16 2025 DCZ001-MDZ008-011-013-014-016>018-508-VAZ053>055-057-527-170445- /O.NEW.KLWX.HT.Y.0007.250717T1500Z-250718T0000Z/ District of Columbia-Cecil-Southern Baltimore-Prince Georges-Anne Arundel-Charles-St. Marys-Calvert-Southeast Harford-Fairfax- Arlington/Falls Church/Alexandria-Stafford-King George-Central and Southeast Prince William/Manassas/Manassas Park- 439 PM EDT Wed Jul 16 2025 ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values around 105 expected. * WHERE...Washington DC, and portions of central, northern, and southern Maryland, and central and northern Virginia. * WHEN...From 11 AM to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ ADS