RSS Mesoscale Discussions from Storm Prediction Center
WW 377 SEVERE TSTM CO 221930Z - 230300Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 377
NWS Storm Prediction Center Norman OK
130 PM MDT Mon Jun 22 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Colorado
* Effective this Monday afternoon and evening from 130 PM until
900 PM MDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 3
inches in diameter likely
Scattered damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Scattered thunderstorms will develop this afternoon over
eastern Colorado, in a relatively moist and unstable air mass.
Large to very-large hail will be the primary risk with this
activity.
The severe thunderstorm watch area is approximately along and 60
statute miles east and west of a line from 60 miles north of Akron
CO to 35 miles west southwest of Springfield CO. 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 374...WW 375...WW 376...
AVIATION...A few severe thunderstorms with hail surface and aloft to
3 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 0379 Status Updates
STATUS REPORT ON WW 379
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 E RDU TO
10 N AVC TO 10 SSE RIC.
..SMITH..06/23/26
ATTN...WFO...RAH...RNK...AKQ...
STATUS REPORT FOR WS 379
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NCC083-127-131-183-185-230200-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
HALIFAX NASH NORTHAMPTON
WAKE WARREN
VAC025-036-053-081-093-095-131-149-175-181-183-199-550-570-595-
620-650-670-700-710-730-735-740-800-810-830-230200-
VA
. VIRGINIA COUNTIES INCLUDED ARE
BRUNSWICK CHARLES CITY DINWIDDIE
GREENSVILLE ISLE OF WIGHT JAMES CITY
NORTHAMPTON PRINCE GEORGE SOUTHAMPTON
SURRY SUSSEX YORK
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
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WW 0378 Status Updates
STATUS REPORT ON WW 378
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SE RMG TO
60 NNW AHN.
..SMITH..06/23/26
ATTN...WFO...FFC...MRX...
STATUS REPORT FOR WS 378
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
GAC015-057-085-187-311-230200-
GA
. GEORGIA COUNTIES INCLUDED ARE
BARTOW CHEROKEE DAWSON
LUMPKIN WHITE
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.
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WW 0377 Status Updates
STATUS FOR WATCH 0377 HAS NOT BEEN ISSUED YET
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WW 0376 Status Updates
STATUS REPORT ON WW 376
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1257
..MOORE..06/22/26
ATTN...WFO...BYZ...CYS...UNR...RIW...
STATUS REPORT FOR WS 376
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC003-011-017-025-075-087-222140-
MT
. MONTANA COUNTIES INCLUDED ARE
BIG HORN CARTER CUSTER
FALLON POWDER RIVER ROSEBUD
NEC007-013-033-045-105-123-157-165-222140-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BANNER BOX BUTTE CHEYENNE
DAWES KIMBALL MORRILL
SCOTTS BLUFF SIOUX
SDC033-047-081-103-222140-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
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WW 0375 Status Updates
STATUS FOR WATCH 0375 HAS NOT BEEN ISSUED YET
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WW 0374 Status Updates
STATUS FOR WATCH 0374 HAS NOT BEEN ISSUED YET
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No Mesoscale Discussions are in effect as of Tue Jun 23 04:02:08 UTC 2026.
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0800 PM CDT Mon Jun 22 2026
Valid 230100Z - 231200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE CENTRAL
HIGH PLAINS AND PARTS OF THE MID ATLANTIC...
...SUMMARY...
Supercells and multicell clusters will continue to produce
significant-severe wind/hail across the central High Plains this
evening. Severe gusts and widn damage may accompany storms near the
Mid-Atlantic coast through late evening. Tonight, isolated severe
storms may occur across the southern Plains into the Middle
Mississippi Valley.
...Synopsis...
A mid-level trough will advance toward the Mid-Atlantic Seaboard
while a pronounced mid-level impulse ejects into the
central/northern High Plains. At the surface, a trough will impinge
on the East Coast while ongoing/developing storms continue to
progress along a baroclinic boundary, from the Mid-MS Valley
northwestward along the High Plains. Strong shear and buoyancy in
both of these regimes will continue to foster severe potential into
the evening hours.
...Mid Atlantic into the Southeast...
A well defined QLCS is tracking across the Mid-Atlantic, with more
sporadic pulse-cellular/multicellular storms progressing over the
Southeast. The QLCS will move offshore over the next hour,
accompanied by a damaging gust threat. Across the Southeast,
multicellular storms supported by the remnants of daytime heating or
localized lift along MCVs appear to be on the wane. Nonetheless,
1000-2000 J/kg remnant MLCAPE will support localized wet downburst
potential with some of the stronger storms over the next couple of
hours. A brief tornado also cannot be ruled out with MCV storms
across the TN Valley.
...High Plains...
Supercells remain in progress across the central to northern High
Plains, where 2-3 inch in diameter hail and gusts well exceeding 75
mph have occurred. 2000+ J/kg MLCAPE, driven by 8+ C/km mid-level
lapse rates, precede many of these supercells, so a severe wind/hail
threat will continue with these storms for at least a few more
hours. A tornado is also possible for supercells that remain inflow
dominant. There is some chance that supercells could grow upscale
into an MCS, which would traverse a surface boundary across the
southern High Plains into the Southern Plains. Confidence in this
scenario is quite low. However, should this evolution occur, severe
gusts would be possible.
...Southern Plains into the Middle MS Valley...
Thunderstorms are initiating along a surface boundary, draped from
the TX Panhandle into central MS. 2000-4000 J/kg MLCAPE and 30-50
kts of effective bulk shear overspreads this boundary, which would
promote multicells and supercells with a severe wind/hail threat
wherever storms mature. Nonetheless, forcing along this boundary is
weak, so the severe threat should remain isolated through tonight.
..Squitieri.. 06/23/2026
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