Source: US National Oceanic and Atmospheric Administration
Note: The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.Note: Click for Watch Status Reports.
SEL7
URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 497
NWS Storm Prediction Center Norman OK
200 PM EDT Wed Jul 9 2025
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
District Of Columbia
Maryland
Far Northwestern North Carolina
South-Central Pennsylvania
Northern, Western, and Central Virginia
Eastern West Virginia
Coastal Waters
* Effective this Wednesday afternoon and evening from 200 PM
until 1000 PM EDT.
* Primary threats include…
Scattered damaging wind gusts to 70 mph likely
Isolated large hail events to 1 inch in diameter possible
SUMMARY…Thunderstorm coverage is expected to increase across the
region this afternoon, with multiple rounds of storms possible.
Moderate buoyancy and vertical shear is expected to support bowing
line segments capable of damaging wind gusts. A few instances of
hail are possible as well, particularly over regions of higher
terrain.
The severe thunderstorm watch area is approximately along and 95
statute miles east and west of a line from 5 miles west northwest of
Hagerstown MD to 60 miles south southwest of Dublin VA. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
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.
&&
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 500. Mean storm motion vector
27035.
…Mosier
SEL7
URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 497
NWS Storm Prediction Center Norman OK
200 PM EDT Wed Jul 9 2025
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
District Of Columbia
Maryland
Far Northwestern North Carolina
South-Central Pennsylvania
Northern, Western, and Central Virginia
Eastern West Virginia
Coastal Waters
* Effective this Wednesday afternoon and evening from 200 PM
until 1000 PM EDT.
* Primary threats include…
Scattered damaging wind gusts to 70 mph likely
Isolated large hail events to 1 inch in diameter possible
SUMMARY…Thunderstorm coverage is expected to increase across the
region this afternoon, with multiple rounds of storms possible.
Moderate buoyancy and vertical shear is expected to support bowing
line segments capable of damaging wind gusts. A few instances of
hail are possible as well, particularly over regions of higher
terrain.
The severe thunderstorm watch area is approximately along and 95
statute miles east and west of a line from 5 miles west northwest of
Hagerstown MD to 60 miles south southwest of Dublin VA. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
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.
&&
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 500. Mean storm motion vector
27035.
…Mosier
Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW7
WW 497 SEVERE TSTM DC MD NC PA VA WV CW 091800Z – 100200Z
AXIS..95 STATUTE MILES EAST AND WEST OF LINE..
5WNW HGR/HAGERSTOWN MD/ – 60SSW PSK/DUBLIN VA/
..AVIATION COORDS.. 85NM E/W /41WNW EMI – 49SSW PSK/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27035.
LAT…LON 39717601 36317939 36318280 39717958
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 497 Status Report Message has not been issued yet.
Note: Click for Complete Product Text.Tornadoes
Probability of 2 or more tornadoes
Low ( 2 inches
Low (10%)
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
High (80%)
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.