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The expiration time in the watch graphic is amended if the watch is
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Watch Status Reports.
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 426
NWS STORM PREDICTION CENTER NORMAN OK
640 PM EDT TUE JUL 14 2015
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
WESTERN AND CENTRAL MARYLAND
NORTHWESTERN NORTH CAROLINA
WESTERN AND NORTHERN VIRGINIA
EASTERN WEST VIRGINIA
COASTAL WATERS
* EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 640 PM
UNTIL 100 AM EDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
SUMMARY...ORGANIZED THUNDERSTORM COMPLEX OVER WEST VIRGINIA AND
EASTERN KENTUCKY SHOULD CONTINUE TO MOVE SOUTHEASTWARD TO
EAST-SOUTHEASTWARD INTO THE WATCH AREA...EITHER MAINTAINING
INTENSITY OR (IF IT TEMPORARILY WEAKENS) STRENGTHENING AGAIN ONCE
ENCOUNTERING FAVORABLE AIR MASS ON THE EAST SIDE OF THE MOUNTAINS.
AS SUCH...DAMAGING GUSTS ARE EXPECTED AND ISOLATED...MARGINALLY
SEVERE HAIL ARE POSSIBLE. SEE SPC MESOSCALE DISCUSSION 1419 FOR
METEOROLOGICAL DETAILS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES SOUTH OF
DUBLIN VIRGINIA TO 50 MILES NORTHWEST OF WASHINGTON DISTRICT OF
COLUM. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
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 421...WW 422...WW
423...WW 424...WW 425...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION
VECTOR 28030.
...EDWARDS
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW6
WW 426 SEVERE TSTM DC MD NC VA WV CW 142240Z - 150500Z
AXIS..70 STATUTE MILES EAST AND WEST OF LINE..
65S PSK/DUBLIN VA/ - 50NW DCA/WASHINGTON DC/
..AVIATION COORDS.. 60NM E/W /35WNW GSO - 34WSW EMI/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 28030.
LAT...LON 36188194 39347900 39347637 36187941
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU6.
Watch 426 Status Report Messages:
STATUS REPORT #1 ON WW 426
VALID 150155Z - 150240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 SSW BLF
TO 15 SW ROA TO 15 N LYH TO 40 NE CHO TO 30 ESE MRB TO 25 SSE HGR.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1423
..GUYER..07/15/15
ATTN...WFO...LWX...RNK...AKQ...
&&
STATUS REPORT FOR WS 426
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
DCC001-150240-
DC
. DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE
DISTRICT OF COLUMBIA
$$
MDC013-017-021-027-031-033-150240-
MD
. MARYLAND COUNTIES INCLUDED ARE
CARROLL CHARLES FREDERICK
HOWARD MONTGOMERY PRINCE GEORGES
$$
NCC033-157-169-171-150240-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
CASWELL ROCKINGHAM STOKES
SURRY
$$
VAC003-009-011-013-019-021-029-031-033-035-037-047-049-059-061-
063-065-067-071-075-077-083-085-089-099-107-109-121-125-137-141-
143-147-153-155-161-173-177-179-197-510-540-590-600-610-630-640-
680-683-685-690-750-770-775-150240-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ALBEMARLE AMHERST APPOMATTOX
ARLINGTON BEDFORD BLAND
BUCKINGHAM CAMPBELL CAROLINE
CARROLL CHARLOTTE CULPEPER
CUMBERLAND FAIRFAX FAUQUIER
FLOYD FLUVANNA FRANKLIN
GILES GOOCHLAND GRAYSON
HALIFAX HANOVER HENRY
KING GEORGE LOUDOUN LOUISA
MONTGOMERY NELSON ORANGE
PATRICK PITTSYLVANIA PRINCE EDWARD
PRINCE WILLIAM PULASKI ROANOKE
SMYTH SPOTSYLVANIA STAFFORD
WYTHE
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
ALEXANDRIA CHARLOTTESVILLE DANVILLE
FAIRFAX FALLS CHURCH FREDERICKSBURG
GALAX LYNCHBURG MANASSAS
MANASSAS PARK MARTINSVILLE RADFORD
ROANOKE SALEM
$$
ANZ535-536-150240-
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 (10%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Low (<5%)
|
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% (F2-F5 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.
weather.gov 
@NWSSPC
