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LW3DBH > ALERT 22.04.20 02:38z 201 Lines 9584 Bytes #999 (0) @ WW
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Subj: Storm Prediction Center 21 04
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Sent: 200422/0210Z @:LW3DBH.1744.BA.ARG.SA #:62519 [MORENO] FBB7.00i $:62519_LW
From: LW3DBH@LW3DBH.1744.BA.ARG.SA
To : ALERT@WW
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WW 130 SEVERE TSTM OK 212350Z - 220700Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch
Number 130 NWS Storm Prediction Center Norman OK 650 PM CDT Tue
Apr 21 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of Western and central
Oklahoma
* Effective this Tuesday night and Wednesday morning from 650 PM
until 200 AM CDT.
* Primary threats include... Scattered large hail and isolated
very large hail events to 3.5 inches in diameter likely Isolated
damaging wind gusts to 70 mph possible
SUMMARY...A couple supercells, one of which may be long-lived,
should gradually evolve east-southeast across western and central
Oklahoma tonight. Large hail, some of which should be significant,
is the primary threat.
The severe thunderstorm watch area is approximately along and 60
statute miles north and south of a line from 45 miles west northwest
of Clinton OK to 40 miles east northeast of Ardmore OK. 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 129...
AVIATION...A few severe thunderstorms with hail surface and aloft
to 3.5 inches. Extreme turbulence and surface wind gusts to 60
knots. A few cumulonimbi with maximum tops to 550. Mean storm motion
vector 29025.
...Grams
WW 129 SEVERE TSTM OK TX 212005Z - 220300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch
Number 129 NWS Storm Prediction Center Norman OK 305 PM CDT Tue
Apr 21 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of Oklahoma Panhandle
Northern Texas Panhandle
* Effective this Tuesday afternoon and evening from 305 PM until
1000 PM CDT.
* Primary threats include... Scattered large hail and isolated
very large hail events to 2.5 inches in diameter likely Scattered
damaging wind gusts to 70 mph possible
SUMMARY...Thunderstorms are expected to increase in coverage and
intensity this afternoon over the watch area, with a few storms
becoming severe. Large hail appears to be the primary threat,
with an increasing risk of damaging wind gusts this evening.
The severe thunderstorm watch area is approximately along and 60
statute miles north and south of a line from 30 miles west northwest
of Dalhart TX to 80 miles southeast of Liberal KS. 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 128...
AVIATION...A few severe thunderstorms with hail surface and aloft
to 2.5 inches. Extreme turbulence and surface wind gusts to 60
knots. A few cumulonimbi with maximum tops to 450. Mean storm motion
vector 29030.
...Hart
WW 0130 Status Updates
STATUS REPORT ON WW 130
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..LYONS..04/22/20
ATTN...WFO...OUN...
STATUS REPORT FOR WS 130
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
OKC009-011-015-017-019-027-031-033-039-043-045-049-051-055-067-
069-073-075-085-087-095-099-109-123-125-129-133-137-149- 220240-
OK . OKLAHOMA COUNTIES INCLUDED ARE
BECKHAM BLAINE CADDO CANADIAN
CARTER CLEVELAND COMANCHE COTTON
CUSTER DEWEY ELLIS GARVIN GRADY
GREER JEFFERSON JOHNSTON KINGFISHER
KIOWA LOVE MCCLAIN MARSHALL MURRAY
OKLAHOMA PONTOTOC POTTAWATOMIE ROGER MILLS
SEMINOLE STEPHENS WASHITA
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.
WW 0129 Status Updates
STATUS REPORT ON WW 129
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 50 ESE BGD TO
50 ENE BGD TO 70 SE LBL TO 70 SE LBL.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 0430
..LYONS..04/22/20
ATTN...WFO...AMA...
STATUS REPORT FOR WS 129
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TXC211-483-220240-
TX . TEXAS COUNTIES INCLUDED ARE
HEMPHILL WHEELER
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.
MD 0430 CONCERNING SEVERE THUNDERSTORM WATCH 129... FOR EASTERN
TEXAS PANHANDLE
Mesoscale Discussion 0430 NWS Storm Prediction Center Norman OK
0812 PM CDT Tue Apr 21 2020
Areas affected...Eastern Texas Panhandle
Concerning...Severe Thunderstorm Watch 129...
Valid 220112Z - 220215Z
The severe weather threat for Severe Thunderstorm Watch 129
continues.
SUMMARY...A couple of supercells will exit WW 129 to WW 130 over the
next hour. A break in activity is expected before the possibility
of additional strong to severe thunderstorm development overnight.
DISCUSSION...Two robust supercells are ongoing in Hemphill county in
the far eastern Texas Panhandle. These storms have produced several
reports of large hail and gusty winds over the last hour. The severe
weather threat is expected to continue across the eastern portions
of WW 129 for 1 to 2 more hours before storms exit to the east.
Intensity should be maintained as low-level moisture advection and
shear are expected to strengthen with the onset of the nocturnal
low-level jet. Sufficiently steep mid-level lapse rates of 7
to 7.5 C/km and MLCAPE of 500-1000 J/kg supports large hail and
damaging outflow winds as the primary threats. Additional strong
to severe storms may develop across portions of the Oklahoma and
Texas Panhandles later tonight as upper level lift from the main
shortwave trough shifts east from the southern Rockies.
..Lyons/Grams.. 04/22/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OUN...AMA...
LAT...LON 36270082 36379999 35360001 35350029 35380075 35900079
36270082
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0743
PM CDT Tue Apr 21 2020
Valid 220100Z - 221200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE SOUTHERN PLAINS...
...SUMMARY... Scattered strong to severe thunderstorms with large
hail and possibly a few wind gusts will be possible across parts
of the southern Plains this evening into tonight.
...Southern Plains... A shortwave ridge will move slowly eastward
across the southern Plains this evening and into the Arklatex
tonight. In the wake of the ridge, an upper-level trough will
approach the southern Plains. Thunderstorms are ongoing just to the
west of the ridge in the eastern Texas Panhandle. These storms are
located along the northern edge of a corridor of moderate instability
(MLCAPE 1200 to 2500 J/kg) extending from central Texas northward
into western Oklahoma and the southeastern Texas Panhandle. The
magnitude of instability is confirmed by the 00Z Amarillo sounding
which shows MUCAPE of 1700 J/kg and 0-6 km shear near 80 kt. The
sounding also shows an impressive 0-3 km AGL lapse rate approaching
10 C/km. While lapse rates are not quite as steep to the north,
the storms will still have plenty of instability to produce large
hail. The more dominant supercells could even produce hailstones of
greater than 2 inches in diameter. This threat for very large hail
should continue through late this evening as the initial activity
moves into southern Oklahoma.
Additional severe thunderstorm development, potentially more
widespread, is expected to take place from the northern Texas
Panhandle into western Oklahoma early tonight as low-level
flow ramps up across the southern Plains. This convection
should move east-northeastward as mid-level flow becomes a bit
more southwesterly ahead of the approaching upper-level trough.
Northwestern and north-central Oklahoma could be impacted by the
stronger thunderstorms. A marginal risk of hail should also exist
south-southwestward into west-central Texas where strong instability,
strong deep-layer shear and steep lapse rates are present. Any
potential for hail there will likely remain very isolated due to
capping issues.
..Broyles.. 04/22/2020
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