Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 663
NWS Storm Prediction Center Norman OK
355 PM EDT Thu Aug 29 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
District Of Columbia
Maryland
South-Central Pennsylvania
Northern Virginia
Far Eastern West Virginia
Coastal Waters
* Effective this Thursday afternoon and evening from 355 PM until
1100 PM EDT.
* Primary threats include...
Scattered damaging wind gusts to 65 mph possible
SUMMARY...Scattered storms will continue to increase, intensify, and
potentially organize as they persist through early/mid-evening, with
localized wind damage and some hail possible.
The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 50 miles north northwest
of Harrisburg PA to 20 miles south of Staunton VA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 662...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1 inch. Extreme turbulence and surface wind gusts to 55 knots. A few
cumulonimbi with maximum tops to 550. Mean storm motion vector
29020.
...Guyer
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 663
NWS Storm Prediction Center Norman OK
355 PM EDT Thu Aug 29 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
District Of Columbia
Maryland
South-Central Pennsylvania
Northern Virginia
Far Eastern West Virginia
Coastal Waters
* Effective this Thursday afternoon and evening from 355 PM until
1100 PM EDT.
* Primary threats include...
Scattered damaging wind gusts to 65 mph possible
SUMMARY...Scattered storms will continue to increase, intensify, and
potentially organize as they persist through early/mid-evening, with
localized wind damage and some hail possible.
The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 50 miles north northwest
of Harrisburg PA to 20 miles south of Staunton VA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 662...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1 inch. Extreme turbulence and surface wind gusts to 55 knots. A few
cumulonimbi with maximum tops to 550. Mean storm motion vector
29020.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3
WW 663 SEVERE TSTM DC MD PA VA WV CW 291955Z - 300300Z
AXIS..60 STATUTE MILES EAST AND WEST OF LINE..
50NNW CXY/HARRISBURG PA/ - 20S SHD/STAUNTON VA/
..AVIATION COORDS.. 50NM E/W /36E PSB - 47NNE LYH/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..55 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 29020.
LAT...LON 40887606 37987780 37988000 40887835
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU3.
Watch 663 Status Report Messages:
STATUS REPORT #3 ON WW 663
VALID 300030Z - 300140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 SSW CHO
TO 40 S MRB TO 10 NNW DCA.
..KERR..08/30/24
ATTN...WFO...LWX...CTP...
&&
STATUS REPORT FOR WS 663
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
DCC001-300140-
DC
. DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE
DISTRICT OF COLUMBIA
$$
MDC017-033-300140-
MD
. MARYLAND COUNTIES INCLUDED ARE
CHARLES PRINCE GEORGES
$$
VAC013-047-059-061-099-137-153-177-179-510-600-610-630-683-685-
300140-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ARLINGTON CULPEPER FAIRFAX
FAUQUIER KING GEORGE ORANGE
PRINCE WILLIAM SPOTSYLVANIA STAFFORD
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
ALEXANDRIA FAIRFAX FALLS CHURCH
FREDERICKSBURG MANASSAS MANASSAS PARK
$$
ANZ535-536-300140-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 663
VALID 292340Z - 300040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SSE EKN
TO 20 NNE SHD TO 20 WNW DCA TO 10 ENE DCA.
..KERR..08/29/24
ATTN...WFO...LWX...CTP...
&&
STATUS REPORT FOR WS 663
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
DCC001-300040-
DC
. DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE
DISTRICT OF COLUMBIA
$$
MDC017-033-300040-
MD
. MARYLAND COUNTIES INCLUDED ARE
CHARLES PRINCE GEORGES
$$
VAC003-013-015-047-059-061-079-091-099-113-125-137-139-153-157-
165-177-179-510-540-600-610-630-660-683-685-790-820-300040-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ALBEMARLE ARLINGTON AUGUSTA
CULPEPER FAIRFAX FAUQUIER
GREENE HIGHLAND KING GEORGE
MADISON NELSON ORANGE
PAGE PRINCE WILLIAM RAPPAHANNOCK
ROCKINGHAM SPOTSYLVANIA STAFFORD
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
ALEXANDRIA CHARLOTTESVILLE FAIRFAX
FALLS CHURCH FREDERICKSBURG HARRISONBURG
MANASSAS MANASSAS PARK STAUNTON
WAYNESBORO
$$
ANZ535-536-300040-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 663
VALID 292300Z - 300040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..LYONS..08/29/24
ATTN...WFO...LWX...CTP...
&&
STATUS REPORT FOR WS 663
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
DCC001-300040-
DC
. DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE
DISTRICT OF COLUMBIA
$$
MDC001-013-017-021-023-027-031-033-043-300040-
MD
. MARYLAND COUNTIES INCLUDED ARE
ALLEGANY CARROLL CHARLES
FREDERICK GARRETT HOWARD
MONTGOMERY PRINCE GEORGES WASHINGTON
$$
PAC001-009-013-021-041-055-057-061-067-087-099-109-111-300040-
PA
. PENNSYLVANIA COUNTIES INCLUDED ARE
ADAMS BEDFORD BLAIR
CAMBRIA CUMBERLAND FRANKLIN
FULTON HUNTINGDON JUNIATA
MIFFLIN PERRY SNYDER
SOMERSET
$$
VAC003-013-015-043-047-059-061-069-079-091-099-107-113-125-137-
139-153-157-165-171-177-179-187-510-540-600-610-630-660-683-685-
790-820-840-300040-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ALBEMARLE ARLINGTON AUGUSTA
CLARKE CULPEPER FAIRFAX
FAUQUIER FREDERICK GREENE
HIGHLAND KING GEORGE LOUDOUN
MADISON NELSON ORANGE
PAGE PRINCE WILLIAM RAPPAHANNOCK
ROCKINGHAM SHENANDOAH SPOTSYLVANIA
STAFFORD WARREN
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
ALEXANDRIA CHARLOTTESVILLE FAIRFAX
FALLS CHURCH FREDERICKSBURG HARRISONBURG
MANASSAS MANASSAS PARK STAUNTON
WAYNESBORO WINCHESTER
$$
WVC003-023-027-031-037-057-065-071-300040-
WV
. WEST VIRGINIA COUNTIES INCLUDED ARE
BERKELEY GRANT HAMPSHIRE
HARDY JEFFERSON MINERAL
MORGAN PENDLETON
$$
ANZ535-536-300040-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (<5%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (50%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Low (10%)
|
Probability of 1 or more hailstones > 2 inches
|
Low (<5%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.
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