RSS Mesoscale Discussions from Storm Prediction Center
WW 510 SEVERE TSTM KY TN VA WV 212210Z - 220500Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 510
NWS Storm Prediction Center Norman OK
510 PM CDT Tue Jul 21 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southeast Kentucky
Northern Tennessee
Extreme Southwest Virginia
Southern West Virginia
* Effective this Tuesday afternoon from 510 PM until Midnight
CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph likely
Isolated large hail events to 1.5 inches in diameter possible
A tornado or two possible
SUMMARY...A line of scattered intense thunderstorms over Kentucky
will sag southward into the watch area through the evening.
Damaging winds are the main concern, but hail and a tornado or two
are also possible.
The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from Dyersburg TN to 110
miles east of Jackson KY. For a complete depiction of the watch see
the associated watch outline update (WOUS64 KWNS WOU0).
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 506...WW 507...WW
508...WW 509...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
30025.
...Hart
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WW 509 SEVERE TSTM DC DE MD NC VA WV CW 211845Z - 220200Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 509
NWS Storm Prediction Center Norman OK
245 PM EDT Tue Jul 21 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
District Of Columbia
Delaware
Maryland
Far Northwest North Carolina
Virginia
The Eastern West Virginia Panhandle
Coastal Waters
* Effective this Tuesday afternoon and evening from 245 PM until
1000 PM EDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph likely
Isolated large hail events to 1.5 inches in diameter possible
A tornado or two possible
SUMMARY...Multiple rounds of strong to severe thunderstorms are
expected across the region today and tonight, beginning with the
ongoing storms across central Virginia. Environmental conditions
support robust updrafts, with all severe hazards possible, including
damaging gusts and isolated hail. A low-probability tornado risk
exists with any afternoon development as well. Another round of
storms is possible along a cold front later tonight, with damaging
gusts as the primary risk. A low-probability, line-embedded tornado
risk exists with these more linear storms as well.
The severe thunderstorm watch area is approximately along and 105
statute miles east and west of a line from 30 miles north northeast
of Baltimore MD to 10 miles west of South Hill VA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU9).
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 506...WW 507...WW 508...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
26030.
...Mosier
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WW 0510 Status Updates
STATUS REPORT ON WW 510
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 E MKL TO
45 NE MKL TO 20 WNW BNA TO 10 ENE BNA TO 30 ESE BNA.
..MEAD..07/22/26
ATTN...WFO...JKL...MRX...MEG...OHX...RLX...
STATUS REPORT FOR WS 510
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TNC003-005-015-031-039-043-055-077-081-085-099-101-117-119-135-
149-177-181-187-220440-
TN
. TENNESSEE COUNTIES INCLUDED ARE
BEDFORD BENTON CANNON
COFFEE DECATUR DICKSON
GILES HENDERSON HICKMAN
HUMPHREYS LAWRENCE LEWIS
MARSHALL MAURY PERRY
RUTHERFORD WARREN WAYNE
WILLIAMSON
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.
Read more
WW 0509 Status Updates
STATUS REPORT ON WW 509
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 S WAL TO
40 W RIC TO 30 SW SHD TO 20 W HGR.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1702
..WEINMAN..07/22/26
ATTN...WFO...LWX...PHI...AKQ...RNK...
STATUS REPORT FOR WS 509
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
DEC001-005-220140-
DE
. DELAWARE COUNTIES INCLUDED ARE
KENT SUSSEX
DCC001-220140-
DC
. DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE
DISTRICT OF COLUMBIA
MDC003-005-009-011-013-015-017-019-021-025-027-029-031-033-035-
037-039-041-043-045-047-510-220140-
MD
. MARYLAND COUNTIES INCLUDED ARE
ANNE ARUNDEL BALTIMORE CALVERT
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WW 0508 Status Updates
STATUS REPORT ON WW 508
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 SSW PAH
TO 35 N LOZ.
..MEAD..07/22/26
ATTN...WFO...PAH...LMK...JKL...
STATUS REPORT FOR WS 508
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
KYC001-003-009-025-035-047-051-053-057-075-083-105-109-125-129-
141-153-169-171-189-199-207-213-219-221-227-231-220140-
KY
. KENTUCKY COUNTIES INCLUDED ARE
ADAIR ALLEN BARREN
BREATHITT CALLOWAY CHRISTIAN
CLAY CLINTON CUMBERLAND
FULTON GRAVES HICKMAN
JACKSON LAUREL LEE
LOGAN MAGOFFIN METCALFE
MONROE OWSLEY PULASKI
RUSSELL SIMPSON TODD
TRIGG WARREN WAYNE
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.
Read more
WW 0507 Status Updates
STATUS REPORT ON WW 507
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W ILG TO
5 WNW TTN TO 20 SSE MSV TO 15 SSW PSF TO 10 WNW BAF.
..LYONS..07/21/26
ATTN...WFO...OKX...ALY...PHI...BGM...CTP...
STATUS REPORT FOR WT 507
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
CTC001-005-009-212340-
CT
. CONNECTICUT COUNTIES INCLUDED ARE
FAIRFIELD LITCHFIELD NEW HAVEN
DEC003-212340-
DE
. DELAWARE COUNTIES INCLUDED ARE
NEW CASTLE
NJC001-003-005-007-009-011-013-015-017-021-023-025-027-029-031-
033-035-039-212340-
NJ
. NEW JERSEY COUNTIES INCLUDED ARE
ATLANTIC BERGEN BURLINGTON
CAMDEN CAPE MAY CUMBERLAND
ESSEX GLOUCESTER HUDSON
Read more
WW 0506 Status Updates
STATUS REPORT ON WW 506
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 50 W HTS TO
30 WSW MGW TO 45 E MGW.
..LYONS..07/21/26
ATTN...WFO...ILN...RLX...PBZ...
STATUS REPORT FOR WS 506
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
KYC019-043-089-127-135-212340-
KY
. KENTUCKY COUNTIES INCLUDED ARE
BOYD CARTER GREENUP
LAWRENCE LEWIS
OHC087-212340-
OH
. OHIO COUNTIES INCLUDED ARE
LAWRENCE
WVC001-005-007-011-013-015-017-019-021-033-035-039-041-043-053-
067-075-077-079-083-085-087-091-093-097-099-101-105-212340-
WV
. WEST VIRGINIA COUNTIES INCLUDED ARE
BARBOUR BOONE BRAXTON
CABELL CALHOUN CLAY
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MD 1706 CONCERNING SEVERE THUNDERSTORM WATCH 510... FOR WESTERN AND MIDDLE TENNESSEE
Mesoscale Discussion 1706
NWS Storm Prediction Center Norman OK
1009 PM CDT Tue Jul 21 2026
Areas affected...western and middle Tennessee
Concerning...Severe Thunderstorm Watch 510...
Valid 220309Z - 220515Z
The severe weather threat for Severe Thunderstorm Watch 510
continues.
SUMMARY...The potential for more organized severe weather appears to
be diminishing. However, sporadic occurrences of damaging winds will
remain possible through 05Z.
DISCUSSION...Ongoing storms across middle TN have failed to sustain
an organized cold pool, with only pockets of enhanced velocities
noted in recent KOHX radar data. While latest objective analysis
indicates the presence of a moderately unstable air mass, poor
low/mid-level lapse rates are tempering updraft vigor. Locally
intense downdrafts will remain capable of sporadic damaging winds
over the next couple of hours. However, the potential for organized
severe weather appears to be diminishing.
..Mead.. 07/22/2026
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OHX...MEG...
LAT...LON 35478950 35848924 36068805 36248762 36318701 36258643
35928597 35648600 35478631 35338759 35218838 35258924
35478950
MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH
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SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0754 PM CDT Tue Jul 21 2026
Valid 220100Z - 221200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM THE LOWER
OHIO VALLEY INTO THE TENNESSEE VALLEY AND PARTS OF THE
MID-ATLANTIC...
...SUMMARY...
Scattered severe storms remains possible this evening within the
Tennessee Valley into the Mid-Atlantic. Damaging winds will be the
primary risk, though a couple of tornadoes could occur with the most
organized storms.
...Synopsis...
A notable shortwave tough will continue moving through the
Mid-Atlantic/Northeast into tonight. Convective overturning from
earlier this afternoon has stabilized much of Pennsylvania/New York
into New England. Forcing for ascent from the shortwave trough and
the surface cold front will allow for isolated activity to persist
tonight. Wind damage remains possible. An MCV is evident in northern
Virginia. This will continue to promote storm development into parts
of the Mid-Atlantic. Earlier activity has reduced buoyancy, but flow
fields will increase as the trough continues to approach. Wind
damage will continue to be the main threat, though a couple of
tornadoes could occur with the strongest storms. MLCAPE of 3000+
J/kg is still present within the Tennessee Valley vicinity. A
cluster of storms north of Nashville will pose the greatest risk for
damaging winds as it tracks southward into the instability axis.
Other strong to severe storms may impact parts of the eastern Great
Basin. Severe wind gusts are the concern in that region.
..Wendt.. 07/22/2026
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