Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 157, NWS Norman, OK

April 24, 2020Hughes County, Seminole County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 24, 2020, 5:51 PM CDT for Hughes County, Seminole County, Oklahoma. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 24, 2020, 5:51 PM CDT (22:51 UTC)
Expired: Apr 24, 2020, 6:30 PM CDT
In force: 39 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Hughes County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 81 km from the middle of the area, began a volume at 22:55 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 24, 3:44 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.9 hours before the alert went out and 89 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1934 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 382 m²/s²
0-3 km storm-relative helicity: 607 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 24, 2:40 PM CDT, 3 hours 11 minutes earlier.

Area forecast discussion, Apr 24, 2:40 PM CDT, 3 hours 11 minutes before

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Hazardous weather outlook, Apr 24, 3:57 PM CDT, 1 hour 54 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
357 PM CDT Fri Apr 24 2020

OKZ004>048-050>052-TXZ083>090-251000-
Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield-
Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne-
Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain-
Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson-
Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton-
Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman-
Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay-
357 PM CDT Fri Apr 24 2020

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...Through Tonight...

.Thunderstorms...
Severe thunderstorms will be possible through early evening,
primarily east of a line extending from Seminole, to Ada and
Durant. Damaging hail up to the size of baseballs and damaging
winds will be the main threats.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

.Thunderstorms...
Thunderstorm chances return Monday and Tuesday. A few strong to
severe thunderstorms will be possible, although widespread severe
weather is not expected at this time.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

In the hours before

Special weather statement, Apr 24, 2:51 PM CDT, 3 hours before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
251 PM CDT Fri Apr 24 2020

OKZ008-242015-
Kay OK-
251 PM CDT Fri Apr 24 2020

...SIGNIFICANT WEATHER ADVISORY FOR west central Kay County Until 315
PM CDT...

AT 249 PM CDT, a strong thunderstorm was located near Blackwell,
moving east at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3676 9736 3688 9737 3689 9711 3670 9715
TIME...MOT...LOC 1949Z 273DEG 16KT 3682 9730

Maxwell

Special weather statement, Apr 24, 3:24 PM CDT, 2 hours 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
324 PM CDT Fri Apr 24 2020

OKZ008-242100-
Kay OK-
324 PM CDT Fri Apr 24 2020

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Kay County Until 400
PM CDT...

AT 322 PM CDT, a strong thunderstorm was located 4 miles southeast of
Kildare, moving east at 30 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3678 9675 3678 9679 3677 9679 3677 9682
      3674 9683 3675 9687 3675 9689 3668 9693
      3670 9704 3668 9706 3665 9706 3665 9708
      3685 9708 3692 9675
TIME...MOT...LOC 2022Z 271DEG 28KT 3677 9699

Maxwell

Special weather statement, Apr 24, 5:39 PM CDT, 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
539 PM CDT Fri Apr 24 2020

OKZ031-032-242315-
Hughes OK-Seminole OK-
539 PM CDT Fri Apr 24 2020

...SIGNIFICANT WEATHER ADVISORY FOR north central Hughes and
northeastern Seminole Counties Until 615 PM CDT...

AT 537 PM CDT, a strong thunderstorm was located 6 miles west of
Cromwell, moving east at 30 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3530 9663 3540 9661 3541 9658 3539 9655
      3539 9654 3541 9654 3542 9656 3543 9655
      3544 9652 3543 9649 3546 9648 3546 9645
      3529 9644 3529 9629 3523 9629
TIME...MOT...LOC 2237Z 277DEG 28KT 3534 9656

Maxwell

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 11:03 PM CDT	Special Weather Statement	OUN	Woods	57 min
Apr 23, 11:05 PM CDT	Special Weather Statement	OUN	Kay	70 min
Apr 24, 3:26 AM CDT	Special Weather Statement	OUN	Logan	34 min
Apr 24, 3:28 AM CDT	Wind Advisory	OUN	Ellis, Harper, Woodward	12 hr
Apr 24, 3:58 AM CDT	Special Weather Statement	OUN	Payne	32 min
Apr 24, 5:17 AM CDT	Special Weather Statement	OUN	Noble	28 min
Apr 24, 2:51 PM CDT	Special Weather Statement	OUN	Kay	24 min
Apr 24, 3:24 PM CDT	Special Weather Statement	OUN	Kay	36 min
Apr 24, 5:39 PM CDT	Special Weather Statement	OUN	Okfuskee	36 min
Apr 24, 6:21 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	39 min
Apr 24, 6:43 PM CDT	Special Weather Statement	OUN	Atoka	32 min
Apr 24, 6:48 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	28 min
Apr 24, 6:54 PM CDT	Tornado Warning	OUN	Bryan	38 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.