Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 593, NWS Norman, OK

July 30, 2020Wilbarger County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jul 30, 2020, 4:39 PM CDT for Wilbarger County, Texas. It was in force for 51 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: Jul 30, 2020, 4:39 PM CDT (21:39 UTC)
Expired: Jul 30, 2020, 5:30 PM CDT
In force: 51 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 40 km from the middle of the area, began a volume at 21:39 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
Jul 30, 4:35 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 9.7 hours before the alert went out and 211 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: 386 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 659 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -119 m²/s²
0-3 km storm-relative helicity: -145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 30, 2:44 PM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Jul 30, 2:44 PM CDT, 1 hour 55 minutes before

Area Forecast Discussion
National Weather Service Norman OK
244 PM CDT Thu Jul 30 2020

...New SHORT TERM...

.SHORT TERM...
(This evening through Friday)
Issued at 227 PM CDT Thu Jul 30 2020

Showers/thunderstorms are likely to develop across southwestern OK
and western north TX this afternoon and evening a mid-level trough
and surface boundary. Latest radar imagery shows a few echoes with
a few cloud flashes already developing over Beckham County in
western OK and tracking quickly east-southeastward at about 40
mph. With a moderately unstable atmosphere in place, little to no
CIN, storms may become severe later this afternoon and evening.
Large hail up to the size of golf balls, damaging winds, and heavy
rainfall are possible with any storms that develop. A few
thunderstorms are also possible this evening over northern
Oklahoma. Precipitation appears likely, generally south of I-40,
through at least 10PM with chances diminishing after midnight.

&&

.LONG TERM...
(Friday night through next Wednesday)
Issued at 220 PM CDT Thu Jul 30 2020

In the wake of Friday's storm system, we should see a break from
rain this weekend with below normal temperatures.

Models (both deterministic and ensemble) are trending further west
with their possible MCS Sunday night into Monday, affecting mainly
the panhandles and parts of western Oklahoma into north Texas.
Latest NBM guidance seems to represent this fairly well.

The most recent WPC cluster analysis is coming in weaker and slower
with the building of the upper level ridge next week. This is
consistent with deterministic models which keep us in an active
northwest flow pattern through much of next week.

Day

&&

.AVIATION...
(18Z TAFS)
Issued at 1251 PM CDT Thu Jul 30 2020

As of 18Z, a prefrontal trough axis appears to be located from
near Bristow to OKC to Elk City, with a cold front situated over
NW Oklahoma. Winds have already shifted to the northwest for
WWR/PNC and winds are forecast to shift northwesterly for all
other TAF sites by evening. Showers/thunderstorms have already
developed from Holdenville to Ada, though none have been severe so
far. Thunderstorms are forecast to develop near KLAW and KSPS
sites this afternoon after 21Z. There is some uncertainty as to
the placement and duration of precipitation. However, model
guidance suggests precipitation may linger over this area until
the early morning hours on Friday.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  69  82  66  84 /  40  30   0   0
Hobart OK         69  87  64  89 /  30  10   0   0
Wichita Falls TX  71  88  66  89 /  60  10   0   0
Gage OK           64  85  60  88 /  20  10   0   0
Ponca City OK     69  81  64  83 /  60  40   0   0
Durant OK         73  88  68  89 /  60  30  10   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...None.
TX...None.
&&

SHORT TERM...01
LONG TERM....14
AVIATION...01

Hazardous weather outlook, Jul 30, 12:05 PM CDT, 4 hours 34 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1205 PM CDT Thu Jul 30 2020

OKZ004>048-050>052-TXZ083>090-311715-
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-
1205 PM CDT Thu Jul 30 2020

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

.DAY ONE...Through tonight...

.Thunderstorms...
There is a Slight Risk for severe storms this afternoon and
tonight (mainly after 3pm) across portions of central and
southern Oklahoma, and western north Texas. The main threats will
be damaging winds up to 65 mph, hail to the size of ping pong
balls, and locally heavy rainfall. Showers and storms could linger
across parts of southern Oklahoma and north Texas into early
Friday morning.

A secondary area of storms will be possible across portions of
northern Oklahoma this afternoon and evening. A marginal risk is
in place for these storms.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across the
risk areas should prepare for severe weather operations this
afternoon and tonight.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday...

.Thunderstorms...
Thunderstorms will still be affecting the area Friday morning and
persist through Friday afternoon. Instability will be lower, so
the potential of severe weather is low.

Thunderstorms will be possible again Sunday night through Monday
night and then again on Tuesday and Wednesday nights.

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, Jul 30, 3:23 PM CDT, 1 hour 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
323 PM CDT Thu Jul 30 2020

OKZ021-022-035-302045-
Kiowa OK-Washita OK-Beckham OK-
323 PM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Kiowa...southwestern
Washita and east central Beckham Counties Until 345 PM CDT...

AT 320 PM CDT, a strong thunderstorm was located near Retrop, moving
east at 40 MPH.

HAZARDS INCLUDE...
Wind gusts over 50 MPH...

Locations impacted include...
Hobart, Sentinel, Rocky and Retrop.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3526 9934 3523 9900 3501 9904 3508 9937
      3509 9937 3509 9939 3511 9941 3511 9943
TIME...MOT...LOC 2020Z 282DEG 34KT 3517 9931

WR

Special weather statement, Jul 30, 4:06 PM CDT, 33 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
406 PM CDT Thu Jul 30 2020

TXZ083-085-302130-
Wilbarger TX-Hardeman TX-
406 PM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR west central Wilbarger and
southeastern Hardeman Counties Until 430 PM CDT...

AT 404 PM CDT, a strong thunderstorm was located 4 miles east of
Medicine Mound, moving east at 40 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 50 MPH...

Locations impacted include...
Vernon, Chillicothe, Lockett, Medicine Mound and Rayland.

LAT...LON 3426 9959 3423 9919 3401 9937 3406 9948
      3407 9948 3407 9949 3408 9951 3407 9952
      3407 9953 3411 9963
TIME...MOT...LOC 2104Z 284DEG 33KT 3418 9952

WR

Special weather statement, Jul 30, 4:18 PM CDT, 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
418 PM CDT Thu Jul 30 2020

OKZ034-035-302145-
Kiowa OK-Greer OK-
418 PM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Kiowa and east
central Greer Counties Until 445 PM CDT...

AT 415 PM CDT, a strong thunderstorm was located near Lone Wolf,
moving southeast at 25 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts over 50 MPH...

LAT...LON 3507 9935 3501 9898 3479 9910 3481 9915
      3485 9915 3485 9917 3486 9917 3486 9919
      3484 9920 3484 9922 3493 9945
TIME...MOT...LOC 2115Z 294DEG 22KT 3497 9930

WR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 8:49 PM CDT	Special Weather Statement	OUN	Harper	26 min
Jul 29, 9:15 PM CDT	Special Weather Statement	OUN	Harper	30 min
Jul 29, 9:45 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods, Woodward	45 min
Jul 29, 10:23 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	36 min
Jul 29, 10:36 PM CDT	Special Weather Statement	OUN	Alfalfa	24 min
Jul 29, 11:51 PM CDT	Special Weather Statement	OUN	Grant, Kay, Noble	24 min
Jul 30, 12:15 AM CDT	Special Weather Statement	OUN	Kay, Noble	30 min
Jul 30, 1:53 AM CDT	Special Weather Statement	OUN	Payne	37 min
Jul 30, 2:37 AM CDT	Special Weather Statement	OUN	Harper	38 min
Jul 30, 3:18 AM CDT	Special Weather Statement	OUN	Harper	27 min
Jul 30, 3:57 AM CDT	Special Weather Statement	OUN	Alfalfa, Grant, Woods	33 min
Jul 30, 4:14 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant	46 min
Jul 30, 4:38 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Kingfisher, Major	37 min
Jul 30, 4:56 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Kingfisher, Logan, Noble and 1 more	49 min
Jul 30, 5:46 AM CDT	Special Weather Statement	OUN	Lincoln, Logan, Oklahoma, Payne	29 min
Jul 30, 6:15 AM CDT	Special Weather Statement	OUN	Lincoln, Oklahoma	30 min
Jul 30, 6:48 AM CDT	Areal Flood Advisory	OUN	Kay	3 hr
Jul 30, 3:23 PM CDT	Special Weather Statement	OUN	Washita	22 min
Jul 30, 4:18 PM CDT	Special Weather Statement	OUN	Kiowa	27 min
Jul 30, 4:22 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	23 min
Jul 30, 4:28 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	17 min
Jul 30, 4:43 PM CDT	Special Weather Statement	OUN	Hughes	17 min
Jul 30, 4:48 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Greer, Jackson, Kiowa, Tillman	42 min
Jul 30, 4:51 PM CDT	Special Weather Statement	OUN	Grady	24 min
Jul 30, 5:00 PM CDT	Special Weather Statement	OUN	Tillman	15 min
Jul 30, 5:03 PM CDT	Special Weather Statement	OUN	Coal	27 min
Jul 30, 5:07 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady, Stephens	38 min
Jul 30, 5:28 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	32 min
Jul 30, 5:29 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	46 min
Jul 30, 5:35 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	40 min
Jul 30, 5:40 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Stephens	50 min
Jul 30, 5:43 PM CDT	Special Weather Statement	OUN	McClain	17 min
Jul 30, 6:07 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Grady, McClain, Stephens	23 min
Jul 30, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens, Tillman	16 min
Jul 30, 6:19 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Pontotoc	26 min
Jul 30, 6:27 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Cotton, Garvin, Jefferson, Johnston, Love and 4 more	48 min
Jul 30, 6:30 PM CDT	Areal Flood Advisory	OUN	Coal, Hughes	3 hr
Jul 30, 6:31 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	44 min
Jul 30, 6:36 PM CDT	Special Weather Statement	OUN	Pontotoc	24 min
Jul 30, 6:52 PM CDT	Special Weather Statement	OUN	Ellis	23 min
Jul 30, 6:56 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes, Johnston, Pontotoc	19 min
Jul 30, 4:06 PM CDT	Special Weather Statement	OUN	Wilbarger	24 min
Jul 30, 4:14 PM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	31 min
Jul 30, 4:25 PM CDT	Severe Thunderstorm Warning	OUN	Foard	20 min
Jul 30, 4:41 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	49 min
Jul 30, 5:26 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita, Wilbarger	49 min
Jul 30, 5:33 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Hardeman, Wilbarger	27 min
Jul 30, 5:45 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Wilbarger	30 min
Jul 30, 5:54 PM CDT	Special Weather Statement	OUN	Knox	36 min
Jul 30, 6:10 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman, Wilbarger	39 min
Jul 30, 6:41 PM CDT	Special Weather Statement	OUN	Wichita	34 min
Jul 30, 6:55 PM CDT	Special Weather Statement	OUN	Baylor	35 min

Nearby

Severe Thunderstorm Warnings in Texas, 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.