Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 613, NWS Norman, OK

July 30, 20209 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 30, 2020, 7:37 PM CDT for 9 counties in Oklahoma. It was in force for 53 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, 7:37 PM CDT (00:37 UTC)
Expired: Jul 30, 2020, 8:30 PM CDT
In force: 53 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Hughes County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Pontotoc County, OK

The radar

The Norman radar (KTLX), 124 km from the middle of the area, began a volume at 00:37 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

Fort Worth, TX (KFWD), launched 00:00Z, 0.6 hours before the alert went out and 181 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: 1104 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 2261 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 151 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.8

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, 6:53 PM CDT, 44 minutes earlier.

Area forecast discussion, Jul 30, 6:53 PM CDT, 44 minutes before

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

...New AVIATION...

.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...
(00Z TAFS)
Issued at 647 PM CDT Thu Jul 30 2020

Showers and storms will continue to develop across southern
Oklahoma and north Texas through the evening, slowly making their
way southeast. Damaging winds will be possible with these storms.
Outside of this convection, breezy northerly winds will prevail.

Day

&&

.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...14

Hazardous weather outlook, Jul 30, 12:05 PM CDT, 7 hours 32 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

Local storm report, Jul 30, 7:09 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
709 PM CDT THU JUL 30 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0435 PM     TSTM WND GST     3 W LOCKETT             34.08N 99.42W
07/30/2020  M75 MPH          WILBARGER          TX   EMERGENCY MNGR

            NEAR THE WILBARGER/FOARD COUNTY LINE

&&

BTHOREN

Local storm report, Jul 30, 7:15 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
715 PM CDT THU JUL 30 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0655 PM     TSTM WND DMG     1 ESE SULPHUR           34.50N 96.96W
07/30/2020                   MURRAY             OK   TRAINED SPOTTER

            5-6 INCH DIAMETER TREE LIMBS DOWN

&&

BTHOREN

Local storm report, Jul 30, 7:16 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
716 PM CDT THU JUL 30 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0705 PM     TSTM WND GST     6 SW FITTSTOWN          34.55N 96.72W
07/30/2020  M67 MPH          PONTOTOC           OK   MESONET

            MESONET STATION FITT FITTSTOWN.

&&

MAD

Local storm report, Jul 30, 7:27 PM CDT, 10 minutes before

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Local storm report, Jul 30, 7:29 PM CDT, 8 minutes before

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Local storm report, Jul 30, 7:35 PM CDT, 2 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 7:06 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Carter, Coal, Johnston, Marshall, Murray and 1 more	39 min
Jul 30, 7:10 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens, Tillman	50 min
Jul 30, 7:24 PM CDT	Flash Flood Warning	OUN	Coal, Hughes, Pontotoc	3 hr
Jul 30, 7:37 PM CDT	Areal Flood Advisory	OUN	Pontotoc	3 hr
Jul 30, 7:39 PM CDT	Flash Flood Warning	OUN	Atoka	3 hr
Jul 30, 7:44 PM CDT	Areal Flood Advisory	OUN	Stephens	3 hr
Jul 30, 7:53 PM CDT	Areal Flood Advisory	OUN	Cotton	3 hr
Jul 30, 7:59 PM CDT	River Flood Warning	OUN	Grant, Kay, Noble	18 hr
Jul 30, 8:08 PM CDT	Special Weather Statement	OUN	Jefferson	52 min
Jul 30, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	50 min
Jul 30, 9:15 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	28 min
Jul 30, 11:33 PM CDT	Special Weather Statement	OUN	Comanche, Cotton	42 min
Jul 31, 12:16 AM CDT	Special Weather Statement	OUN	Comanche, Cotton	44 min
Jul 31, 12:39 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	51 min
Jul 31, 1:26 AM CDT	Special Weather Statement	OUN	Cotton	49 min
Jul 31, 2:48 AM CDT	Special Weather Statement	OUN	Carter	27 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.