Severe Thunderstorm Warning 17, NWS Baltimore/Washington

978 
WWUS51 KLWX 302050
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
450 PM EDT Fri Apr 30 2021

VAC107-302059-
/O.CAN.KLWX.SV.W.0017.000000T0000Z-210430T2115Z/
Loudoun VA-
450 PM EDT Fri Apr 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LOUDOUN COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3911 7664 3873 7674 3853 7704 3858 7721
      3861 7717 3862 7722 3859 7725 3871 7764
      3891 7731 3916 7715
TIME...MOT...LOC 2049Z 270DEG 66KT 3914 7695 3886 7715 3870 7756 

$$

DCC001-MDC003-017-027-031-033-VAC013-059-061-153-510-600-610-683-685-
302115-
/O.CON.KLWX.SV.W.0017.000000T0000Z-210430T2115Z/
District of Columbia DC-Howard MD-Montgomery MD-Prince Georges MD-
Anne Arundel MD-Charles MD-City of Falls Church VA-Fairfax VA-
Fauquier VA-City of Manassas Park VA-Prince William VA-
City of Manassas VA-City of Fairfax VA-Arlington VA-
City of Alexandria VA-
450 PM EDT Fri Apr 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR THE DISTRICT OF COLUMBIA...SOUTH CENTRAL HOWARD...SOUTHEASTERN
MONTGOMERY...PRINCE GEORGES...WEST CENTRAL ANNE ARUNDEL...
NORTHWESTERN CHARLES...FAIRFAX...EASTERN FAUQUIER...CENTRAL PRINCE
WILLIAM...AND ARLINGTON COUNTIES...THE CITY OF FALLS CHURCH...THE
CITY OF MANASSAS PARK...THE CITY OF MANASSAS...THE CITY OF FAIRFAX
AND THE CITY OF ALEXANDRIA...

At 449 PM EDT, a gust front associated with a line of strong showers 
were located along a line extending from near Fairland to Lake 
Barcroft to near Linton Hall, moving east at 70 mph.

HAZARD...70 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...
Arlington, Alexandria, Centreville, Waldorf, Dale City, Rockville,
Bethesda, Bowie, Severn, Annandale, Clinton, Olney, Springfield,
College Park, Crofton, Fort Washington, Greenbelt, Fairfax, Langley
Park and Beltsville.

People attending the FEMA Greenbelt Metro mass vaccination site
should seek safe shelter immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3911 7664 3873 7674 3853 7704 3858 7721
      3861 7717 3862 7722 3859 7725 3871 7764
      3891 7731 3916 7715
TIME...MOT...LOC 2049Z 270DEG 66KT 3914 7695 3886 7715 3870 7756 

HAIL...<.75IN
WIND...70MPH
 
$$

BKF

900 
WWUS51 KLWX 302113
SVSLWX

Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
513 PM EDT Fri Apr 30 2021

DCC001-MDC003-017-027-031-033-VAC013-059-061-153-510-600-610-683-685-
302122-
/O.EXP.KLWX.SV.W.0017.000000T0000Z-210430T2115Z/
District of Columbia DC-Howard MD-Montgomery MD-Prince Georges MD-
Anne Arundel MD-Charles MD-City of Falls Church VA-Fairfax VA-
Fauquier VA-City of Manassas Park VA-Prince William VA-
City of Manassas VA-City of Fairfax VA-Arlington VA-
City of Alexandria VA-
513 PM EDT Fri Apr 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR THE DISTRICT OF COLUMBIA...
SOUTH CENTRAL HOWARD...SOUTHEASTERN MONTGOMERY...PRINCE GEORGES...
WEST CENTRAL ANNE ARUNDEL...NORTHWESTERN CHARLES...FAIRFAX...EASTERN
FAUQUIER...CENTRAL PRINCE WILLIAM...AND ARLINGTON COUNTIES...THE CITY
OF FALLS CHURCH...THE CITY OF MANASSAS PARK...THE CITY OF MANASSAS...
THE CITY OF FAIRFAX AND THE CITY OF ALEXANDRIA WILL EXPIRE AT 515 PM
EDT...
    
The showers which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However, high 
winds are still possible with these showers.

Remember, a Severe Thunderstorm Warning still remains in effect for
portions of southern Maryland until 545 PM EDT.

LAT...LON 3911 7664 3873 7674 3853 7704 3858 7721
      3861 7717 3862 7722 3859 7725 3871 7764
      3891 7731 3916 7715
TIME...MOT...LOC 2112Z 286DEG 66KT 3904 7651 3876 7671 3860 7712 

$$

LFR

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
211 PM EDT Fri Apr 30 2021

.SYNOPSIS...
High pressure will build in from the Great Lakes over the
weekend, then shift offshore next week as a frontal system
approaches from the Midwest.

&&

.NEAR TERM /THROUGH TONIGHT/...
***DAMAGING WIND WILL PERSIST THROUGH THIS EVENING***

A rather noteworthy late season high wind event is ongoing
across the Middle Atlantic. People should treat this like a
severe thunderstorm. Remain in a sturdy building away from
windows and limit travel. Avoid wooded areas.

This event is due to strengthening low pressure off the New
England coast battling high pressure building in from the
Midwest. The resultant pressure gradient will strengthen this
evening, and so will the wind field aloft as the mid level
trough axis forcing the low pivots overhead. Widespread W/NW
wind gusts of 45 to 60 mph are being observed and should
persist into the evening. Sustained wind may decrease somewhat
with the loss of daytime heating, but higher gusts are possible
at least sporadically through the evening as the wind field
aloft strengthens and cold advection/pressure rises continue. A
few gusts near 70 mph can't be ruled out mainly over the higher
elevations of northern Maryland this evening.

Scattered shower activity associated with the mid level trough
axis should peak this evening with thunder and small hail
possible given cold mid levels.

Lows around freezing are expected over the ridges of the
Alleghenies where a Freeze Warning is in effect tonight. Lows in
the 40s with wind chills in the 20s are expected elsewhere.

&&

.SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/...
High pressure of Canadian origin will build in from the Great
Lakes and Midwest this weekend offering dry and seasonable
conditions. Saturday will be blustery to start, but the wind
should slacken off significantly by late afternoon.

Clouds may begin to increase late in the weekend as high
pressure moves offshore. The wind will turn southwesterly
leading to a warming trend heading into early next week.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
For the start of the work week, we'll see precip chances increase
throughout the day on Monday as a warm front moves north into the
area as a closed low that originated down in Texas continues to
push towards the northeast. As the low tracks to our north, a
fairly non-progressive associated cold front will lag behind it,
bringing more increased chances for precip and some isolated
storms Monday through Wednesday with multiple disturbances
passing through.

As this front slowly moves through, we'll see an increased risk
for severe thunderstorms and flooding. ECMWF ensemble PWAT
probabilities for >=1.5" is 70% or higher east of the Blue Ridge
Mountains for this time period. GEFS members suggest 1500+ J/kg
CAPE for Tuesday afternoon with shear 30 to 35 knots. Will keep
chance thunder in for this time period and increase if need be
once closer to the period.

After Wednesday evening, we'll start to see a brief area of
high pressure for Thursday before a deep area of low pressure
affects the area by Friday morning bringing the next chance for
impactful weather as well a decrease in temperatures following
the frontal passage.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
A high wind event is ongoing across the region. W/NW gusts to
around 50 kt are expected until about 03z, slightly lower around
40 kt near KCHO. Sustained wind may diminish slightly this
evening with the loss of daytime heating, but gusts may increase
at least sporadically as the wind field aloft strengthens.

The wind will gradually diminish late tonight into Saturday
morning before dropping significantly by late Saturday afternoon
as high pressure builds overhead. This high pressure should
bring VFR conditions and a lighter SW wind Sunday.

VFR conditions expected at least Monday before some instances of sub-
VFR conditions become possible with impending showers and storms as
low pressure tracks to the north. An associated cold frontal
passage Tuesday/Wednesday will lead to increased instances of
sub-VFR conditions with showers and storms possible, some of
which may be severe.

&&

.MARINE...
***DANGEROUS HIGH WIND EVENT THROUGH THIS EVENING***

Widespread W/NW gusts of 40 to 50 kt are forecast to persist
through this evening. The wind should diminish Saturday
especially by late afternoon, though gale conditions may persist
until just after daybreak Saturday, with SCA conditions likely
persisting until nightfall. High pressure will build overhead
Saturday night into Sunday with a lighter wind becoming SW.

SCA conditions possible Monday and Tuesday with multiple rounds of
associated disturbances. SMWs possible Tuesday afternoon and
evening.

&&

.TIDES/COASTAL FLOODING...
Strong NW/offshore flow will cause water levels to decline through
Saturday morning, and will likely result in blowout tides.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...High Wind Warning until 2 AM EDT Saturday for DCZ001.
MD...Freeze Warning from midnight tonight to 9 AM EDT Saturday for
     MDZ001.
     Wind Advisory until 1 AM EDT Saturday for MDZ001.
     High Wind Warning until 2 AM EDT Saturday for MDZ003>006-008-
     011-013-014-503>508.
     Wind Advisory until 2 AM EDT Saturday for MDZ016>018.
     High Wind Warning until 1 AM EDT Saturday for MDZ501-502.
VA...Freeze Warning from midnight tonight to 9 AM EDT Saturday for
     VAZ503.
     Wind Advisory until 1 AM EDT Saturday for VAZ025>031-503.
     High Wind Warning until 2 AM EDT Saturday for VAZ053-054-
     505>508.
     Wind Advisory until 2 AM EDT Saturday for VAZ036>040-051-052-
     055-057-501-502.
     High Wind Warning until 1 AM EDT Saturday for VAZ504.
     Red Flag Warning until 8 PM EDT this evening for VAZ050-056.
WV...Freeze Warning from midnight tonight to 9 AM EDT Saturday for
     WVZ501-505.
     Wind Advisory until 1 AM EDT Saturday for WVZ050-055-501-505.
     High Wind Warning until 2 AM EDT Saturday for WVZ051>053.
     High Wind Warning until 1 AM EDT Saturday for WVZ502>504-506.
MARINE...Storm Warning until 6 AM EDT Saturday for ANZ530>532-535-
     538>540.
     Gale Warning until 6 AM EDT Saturday for ANZ533-534-536-537-
     541>543.

&&

SYNOPSIS...DHOF
NEAR TERM...DHOF
SHORT TERM...DHOF
LONG TERM...ADM
AVIATION...DHOF/ADM
MARINE...BRO/DHOF/ADM
TIDES/COASTAL FLOODING...DHOF

Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
242 PM EDT Fri Apr 30 2021

ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508-
VAZ052>057-011845-
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-Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-
242 PM EDT Fri Apr 30 2021

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

A High Wind Warning is in effect for the Baltimore MD and
Washington D.C. Metropolitan areas through this evening. A Wind
Advisory is in effect for southern Maryland and the Fredericksburg
area in Virginia.

A Storm Warning is in effect for the Maryland Chesapeake Bay north
of North Beach MD and the upper tidal Potomac River through
tonight. A Gale Warning is in effect for the remainder of the
waters during this time.

There is an enhanced threat for the spread of fires due to gusty
winds and low relative humidity this afternoon, mainly in the
Fredericksburg area of Virginia.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Please send any wind reports to the National Weather Service.

MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508-
WVZ050>053-055-011845-
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-Hampshire-Morgan-Berkeley-Jefferson-
Hardy-
242 PM EDT Fri Apr 30 2021

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

A High Wind Warning is in effect for portions of northern and
central Maryland as well as portions of the eastern Panhandle of
West Virginia and the DC metro area in northern Virginia late
this morning through this evening. A Wind Advisory is in effect
for much of the rest of the area through this evening.

There is an enhanced threat for the spread of fires due to gusty
winds and low relative humidity this afternoon, mainly across
portions of the north-central Virginia piedmont.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Please send any wind reports to the National Weather Service.

MDZ001-501-502-VAZ503-504-WVZ501>506-011845-
Garrett-Extreme Western Allegany-Central and Eastern Allegany-
Western Highland-Eastern Highland-Western Grant-Eastern Grant-
Western Mineral-Eastern Mineral-Western Pendleton-
Eastern Pendleton-
242 PM EDT Fri Apr 30 2021

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

A High Wind Warning is in effect in the lee of the Allegheny Front
through this evening, with a Wind Advisory elsewhere.

A Freeze Warning is in effect starting at midnight for the higher
elevations of the Alleghenies.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

The Freeze Warning continues through 9 AM Saturday morning.

.SPOTTER INFORMATION STATEMENT...

Please send any wind reports to the National Weather Service.

DHOF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
356 PM EDT FRI APR 30 2021

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

0232 PM     NON-TSTM WND DMG 1 WNW MIDDLEBURG        39.60N  77.24W
04/30/2021                   CARROLL            MD   DEPT OF HIGHWAYS

            WIRES DOWN AT INTERSECTION OF MD-77 AND MD-194.

&&

EVENT NUMBER LWX2103884

CPB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
401 PM EDT FRI APR 30 2021

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

0232 PM     NON-TSTM WND DMG 1 ENE RICHARDSMERE      39.69N  76.10W
04/30/2021                   CECIL              MD   DEPT OF HIGHWAYS

            POLE AND WIRES BLEW DOWN ON MD-1 NEAR HORSESHOE DRIVE.

&&

EVENT NUMBER LWX2103885

CPB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
404 PM EDT FRI APR 30 2021

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

0353 PM     NON-TSTM WND GST MARTINSBURG ARPT        39.40N  77.98W
04/30/2021  M59 MPH          BERKELEY           WV   ASOS

&&

EVENT NUMBER LWX2103886

CPB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
418 PM EDT FRI APR 30 2021

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

0320 PM     NON-TSTM WND GST 3 SSW SABILLASVILLE     39.65N  77.47W
04/30/2021  M59 MPH          FREDERICK          MD   AWOS

&&

EVENT NUMBER LWX2103887

CPB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
423 PM EDT FRI APR 30 2021

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

0345 PM     NON-TSTM WND DMG 3 N THURMONT            39.67N  77.40W
04/30/2021                   FREDERICK          MD   NWS EMPLOYEE

            TREE BLEW DOWN ON FENCE.

&&

EVENT NUMBER LWX2103889

CPB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
430 PM EDT FRI APR 30 2021

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

0356 PM     NON-TSTM WND DMG 1 SSE FORESTVILLE       38.84N  76.87W
04/30/2021                   PRINCE GEORGES     MD   DEPT OF HIGHWAYS

            TREE BLEW DOWN ON DC-295 SOUTHBOUND BEFORE PENNSYLVANIA
            AVE SE, RIGHT SIDE BLOCKED.

&&

EVENT NUMBER LWX2103890

CPB