Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 588, NWS Norman, OK

July 30, 20207 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 30, 2020, 4:56 AM CDT for 7 counties in Oklahoma. It was in force for 49 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, 4:56 AM CDT (09:56 UTC)
Expired
Jul 30, 2020, 5:45 AM CDT
In force
49 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Garfield County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Noble County, OK, Payne County, OK

The radar

The Vance AFB radar (KVNX), 74 km from the middle of the area, began a volume at 09:58 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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 9.9 hours before the alert went out and 124 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2020-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1768 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2020-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 195 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1768 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
1314 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
195 m²/s²
0-3 km storm-relative helicity
202 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.4

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, 4:49 AM CDT, 7 minutes earlier.

Area forecast discussion, Jul 30, 4:49 AM CDT, 7 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <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>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Jul 29, 9:42 PM CDT, 7 hours 14 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
942 PM CDT Wed Jul 29 2020

OKZ004>048-050>052-TXZ083>090-301130-
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-
942 PM CDT Wed Jul 29 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 risk of strong to severe thunderstorms across the
northern third of Oklahoma. The stronger storms will produce
wind gusts near 60 mph and locally heavy rainfall. Some hail is
also possible. The most likely time for severe storms will be from
the mid evening through about 2 am.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

.Thunderstorms...
Thunderstorm chances will continue through late Friday with the
highest chances Thursday night into Friday morning. Strong to
severe storms will be possible Thursday afternoon into the
overnight hours Thursday night, with damaging winds, large hail
and locally heavy rain the main concerns. Most of Saturday and
Sunday will be dry, but thunderstorm chances will increase Sunday
night through Monday morning.

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, 2:37 AM CDT, 2 hours 19 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
237 AM CDT Thu Jul 30 2020

OKZ004-300815-
Harper OK-
237 AM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Harper County Until
315 AM CDT...

AT 235 AM CDT, a strong thunderstorm was located 7 miles northeast of
Gate, moving east at 20 MPH.

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

LAT...LON 3700 9953 3679 9955 3681 10000 3700 10000
TIME...MOT...LOC 0735Z 270DEG 19KT 3693 9997

..speg.
Special weather statement, Jul 30, 3:18 AM CDT, 1 hour 38 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
318 AM CDT Thu Jul 30 2020

OKZ004-005-010-300845-
Woodward OK-Harper OK-Woods OK-
318 AM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR north central Woodward...Harper
and northern Woods Counties Until 345 AM CDT...

AT 317 AM CDT, strong thunderstorms were along a line extending from
10 miles south of Buttermilk to near Laverne, moving east at 50 MPH.

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

LAT...LON 3699 9856 3662 9932 3665 10000 3700 10000
TIME...MOT...LOC 0817Z 273DEG 42KT 3696 9932 3674 9988

..speg.
Special weather statement, Jul 30, 3:57 AM CDT, 59 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
357 AM CDT Thu Jul 30 2020

OKZ005>007-012-300930-
Garfield OK-Alfalfa OK-Woods OK-Grant OK-
357 AM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Garfield...
Alfalfa...Woods and Grant Counties Until 430 AM CDT...

AT 353 AM CDT, the leading edge of strong and gusty thunderstorm
winds extended along a line extending from near Manchester to 7
miles east of Waynoka, moving east at 60 MPH. The strong winds will
approach before the thunderstorms themselves.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...

LAT...LON 3700 9746 3675 9746 3651 9788 3656 9895
      3700 9930
TIME...MOT...LOC 0853Z 273DEG 52KT 3694 9803 3657 9875

..speg.
Local storm report, Jul 30, 4:14 AM CDT, 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
414 AM CDT THU JUL 30 2020

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

0405 AM     TSTM WND GST     1 SSW CHEROKEE          36.74N 98.36W
07/30/2020  M57 MPH          ALFALFA            OK   MESONET

&&

JPIKE
Local storm report, Jul 30, 4:35 AM CDT, 21 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <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>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Local storm report, Jul 30, 4:42 AM CDT, 14 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <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>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 29, 8:49 PM CDTSpecial Weather StatementOUNHarper26 min
Jul 29, 9:15 PM CDTSpecial Weather StatementOUNHarper30 min
Jul 29, 9:45 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods, Woodward45 min
Jul 29, 10:23 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods36 min
Jul 29, 10:36 PM CDTSpecial Weather StatementOUNAlfalfa24 min
Jul 29, 11:51 PM CDTSpecial Weather StatementOUNGrant, Kay, Noble24 min
Jul 30, 12:15 AM CDTSpecial Weather StatementOUNKay, Noble30 min
Jul 30, 1:53 AM CDTSpecial Weather StatementOUNPayne37 min
Jul 30, 2:37 AM CDTSpecial Weather StatementOUNHarper38 min
Jul 30, 3:18 AM CDTSpecial Weather StatementOUNHarper27 min
Jul 30, 3:57 AM CDTSpecial Weather StatementOUNAlfalfa, Grant, Woods33 min
Jul 30, 4:14 AM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Grant46 min
Jul 30, 4:38 AM CDTSevere Thunderstorm WarningOUNAlfalfa, Blaine, Garfield, Kingfisher, Major37 min
Jul 30, 5:46 AM CDTSpecial Weather StatementOUNLincoln, Logan, Oklahoma, Payne29 min
Jul 30, 6:15 AM CDTSpecial Weather StatementOUNLincoln, Oklahoma30 min
Jul 30, 6:48 AM CDTAreal Flood AdvisoryOUNKay3 hr
Jul 30, 3:23 PM CDTSpecial Weather StatementOUNWashita22 min
Jul 30, 4:18 PM CDTSpecial Weather StatementOUNKiowa27 min
Jul 30, 4:22 PM CDTSevere Thunderstorm WarningOUNGreer, Jackson, Kiowa23 min
Jul 30, 4:28 PM CDTSevere Thunderstorm WarningOUNKiowa17 min
Jul 30, 4:43 PM CDTSpecial Weather StatementOUNHughes17 min
Jul 30, 4:48 PM CDTSevere Thunderstorm WarningOUNComanche, Greer, Jackson, Kiowa, Tillman42 min
Jul 30, 4:51 PM CDTSpecial Weather StatementOUNGrady24 min
Jul 30, 5:00 PM CDTSpecial Weather StatementOUNTillman15 min
Jul 30, 5:03 PM CDTSpecial Weather StatementOUNCoal27 min
Jul 30, 5:07 PM CDTSevere Thunderstorm WarningOUNComanche, Grady, Stephens38 min
Jul 30, 5:28 PM CDTSevere Thunderstorm WarningOUNCoal, Hughes32 min
Jul 30, 5:29 PM CDTSevere Thunderstorm WarningOUNComanche, Cotton, Tillman46 min
Jul 30, 5:35 PM CDTSevere Thunderstorm WarningOUNGarvin, McClain40 min
Jul 30, 5:40 PM CDTSevere Thunderstorm WarningOUNComanche, Cotton, Stephens50 min
Jul 30, 5:43 PM CDTSpecial Weather StatementOUNMcClain17 min
Jul 30, 6:07 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Grady, McClain, Stephens23 min
Jul 30, 6:14 PM CDTSevere Thunderstorm WarningOUNComanche, Cotton, Jefferson, Stephens, Tillman16 min
Jul 30, 6:19 PM CDTSevere Thunderstorm WarningOUNAtoka, Coal, Pontotoc26 min
Jul 30, 6:27 PM CDTSevere Thunderstorm WarningOUNCarter, Cotton, Garvin, Jefferson, Johnston, Love and 4 more48 min
Jul 30, 6:30 PM CDTAreal Flood AdvisoryOUNCoal, Hughes3 hr
Jul 30, 6:31 PM CDTSevere Thunderstorm WarningOUNComanche, Cotton, Tillman44 min
Jul 30, 6:36 PM CDTSpecial Weather StatementOUNPontotoc24 min
Jul 30, 6:52 PM CDTSpecial Weather StatementOUNEllis23 min
Jul 30, 6:56 PM CDTSevere Thunderstorm WarningOUNAtoka, Coal, Hughes, Johnston, Pontotoc19 min
Jul 30, 4:06 PM CDTSpecial Weather StatementOUNWilbarger24 min
Jul 30, 4:14 PM CDTSevere Thunderstorm WarningOUNWilbarger31 min
Jul 30, 4:25 PM CDTSevere Thunderstorm WarningOUNFoard20 min
Jul 30, 4:39 PM CDTSevere Thunderstorm WarningOUNWilbarger51 min
Jul 30, 4:41 PM CDTSevere Thunderstorm WarningOUNFoard, Knox49 min
Jul 30, 5:26 PM CDTSevere Thunderstorm WarningOUNArcher, Baylor, Wichita, Wilbarger49 min
Jul 30, 5:33 PM CDTSevere Thunderstorm WarningOUNBaylor, Foard, Hardeman, Wilbarger27 min
Jul 30, 5:45 PM CDTSevere Thunderstorm WarningOUNFoard, Wilbarger30 min
Jul 30, 5:54 PM CDTSpecial Weather StatementOUNKnox36 min
Jul 30, 6:10 PM CDTSevere Thunderstorm WarningOUNFoard, Hardeman, Wilbarger39 min
Jul 30, 6:41 PM CDTSpecial Weather StatementOUNWichita34 min
Jul 30, 6:55 PM CDTSpecial Weather StatementOUNBaylor35 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020Every 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.