Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 481
NWS Storm Prediction Center Norman OK
1255 AM EDT Wed Sep 1 2021
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
District Of Columbia
Central and northern Maryland
Northeastern Virginia
Coastal Waters
* Effective this Wednesday morning from 1255 AM until 800 AM EDT.
* Primary threats include...
A couple tornadoes possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...A potentially tornadic supercell on the fringes of Ida's
remnants will exit tornado watch 480 in the next 1-2 hours and is
moving generally toward the DC metro. Other convection also may
develop and become supercellular overnight, along a frontal zone
draped across the watch area.
The tornado watch area is approximately along and 30 statute miles
either side of a line from 50 miles west southwest of Washington DC
to 30 miles northeast of Baltimore MD. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU1).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 480...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 23035.
...Edwards
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 481
NWS Storm Prediction Center Norman OK
1255 AM EDT Wed Sep 1 2021
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
District Of Columbia
Central and northern Maryland
Northeastern Virginia
Coastal Waters
* Effective this Wednesday morning from 1255 AM until 800 AM EDT.
* Primary threats include...
A couple tornadoes possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...A potentially tornadic supercell on the fringes of Ida's
remnants will exit tornado watch 480 in the next 1-2 hours and is
moving generally toward the DC metro. Other convection also may
develop and become supercellular overnight, along a frontal zone
draped across the watch area.
The tornado watch area is approximately along and 30 statute miles
either side of a line from 50 miles west southwest of Washington DC
to 30 miles northeast of Baltimore MD. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU1).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 480...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 23035.
...Edwards
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW1
WW 481 TORNADO DC MD VA CW 010455Z - 011200Z
AXIS..30 STATUTE MILES EITHER SIDE OF LINE..
50WSW DCA/WASHINGTON DC/ - 30NE BWI/BALTIMORE MD/
..AVIATION COORDS.. 25NM EITHER SIDE /4S CSN - 33E EMI/
WIND GUSTS..60 KNOTS.
MAX TOPS TO 500.MEAN STORM MOTION VECTOR 23035.
LAT...LON 38937817 39867657 39117598 38207760
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.
Watch 481 Status Report Messages:
STATUS REPORT #1 ON WW 481
VALID 010900Z - 011040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W NHK TO
15 NNE DCA TO 35 WNW BWI TO 5 SE HGR.
..BROYLES..09/01/21
ATTN...WFO...LWX...
&&
STATUS REPORT FOR WT 481
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MDC003-005-013-021-025-027-033-510-011040-
MD
. MARYLAND COUNTIES INCLUDED ARE
ANNE ARUNDEL BALTIMORE CARROLL
FREDERICK HARFORD HOWARD
PRINCE GEORGES
MARYLAND INDEPENDENT CITIES INCLUDED ARE
BALTIMORE CITY
$$
ANZ530-531-532-538-539-540-011040-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
CHESAPEAKE BAY NORTH OF POOLES ISLAND MD
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR
CHESTER RIVER TO QUEENSTOWN MD
EASTERN BAY
$$
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
|
Mod (40%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (20%)
|
Wind
Probability of 10 or more severe wind events
|
Low (20%)
|
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
|
Mod (30%)
|
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.
weather.gov 
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