Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 228, NWS Tulsa, OK

May 20, 20224 counties in Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 20, 2022, 10:48 PM CDT for 4 counties in Oklahoma. It was in force for 57 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: May 20, 2022, 10:48 PM CDT (03:48 UTC)
Expired: May 20, 2022, 11:45 PM CDT
In force: 57 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Adair County, OK, Cherokee County, OK, Delaware County, OK, Mayes County, OK

The radar

The Tulsa radar (KINX), 58 km from the middle of the area, began a volume at 03:48 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
May 20, 7:40 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.8 hours before the alert went out and 132 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: 2486 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1237 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 304 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.9

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 20, 9:51 PM CDT, 57 minutes earlier.

Area forecast discussion, May 20, 9:51 PM CDT, 57 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, May 20, 4:50 PM CDT, 5 hours 58 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
450 PM CDT Fri May 20 2022

ARZ001-002-010-011-019-020-029-OKZ049-053>076-211030-
Adair OK-Benton AR-Carroll AR-Cherokee OK-Choctaw OK-Craig OK-
Crawford AR-Creek OK-Delaware OK-Franklin AR-Haskell OK-Latimer OK-
Le Flore OK-Madison AR-Mayes OK-McIntosh OK-Muskogee OK-Nowata OK-
Okfuskee OK-Okmulgee OK-Osage OK-Ottawa OK-Pawnee OK-Pittsburg OK-
Pushmataha OK-Rogers OK-Sebastian AR-Sequoyah OK-Tulsa OK-Wagoner OK-
Washington OK-Washington AR-
450 PM CDT Fri May 20 2022

This Outlook is for Northwest and West Central Arkansas as well as
much of Eastern Oklahoma.

.DAY ONE...This Evening and Tonight.

SEVERE THUNDERSTORM.
	RISK...Elevated.
	AREA...Primarily Eastern Oklahoma...possibly into far northwest
    Arkansas.
    ONSET...After 7 PM.

HEAVY RAIN.
	RISK...Limited.
	AREA...Northeast Oklahoma.
	ONSET...After midnight.

SIGNIFICANT WINDS.
	RISK...Limited.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...Ongoing.

DISCUSSION...
Scattered storms are expected to develop this evening between 7 and
9 pm across south central Oklahoma and possibly northeastward into
northeast Oklahoma along a slow moving cold front. Storms that are able
to expand south of the cold front will pose a risk of large hail and
locally damaging winds. Overnight storm coverage is likely to
increase north of the cold front and instances of large hail are
possible through the early morning hours. Additionally, locally heavy
rainfall is possible generally across northeast Oklahoma in proximity
and north of the stalled frontal boundary.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Activation of the Regional Spotter Network Possible.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
SATURDAY...Severe Thunderstorm and High Wind Potential.
SUNDAY...Thunderstorm Potential.
MONDAY through WEDNESDAY...Thunderstorm and Heavy Rain Potential.
THURSDAY...No Hazards.

EXTENDED DISCUSSION...
Thunderstorms will continue in vicinity of the cold front
as it move southeastward during the day Saturday. Storms along
or just east of the front will pose a risk of severe weather
primarily during the afternoon hours. The active weather pattern
continues with widespread showers and storms Monday through
Wednesday. Locally heavy rainfall totals are likely over this
time frame with favored locations refined through later forecasts.

weather.gov/tulsa contains additional information.

In the hours before

Special weather statement, May 20, 10:11 PM CDT, 37 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1011 PM CDT Fri May 20 2022

OKZ062-063-067-068-210400-
Cherokee OK-Delaware OK-Mayes OK-Wagoner OK-
1011 PM CDT Fri May 20 2022

...Strong thunderstorms will impact portions of Delaware, southern
Mayes, eastern Wagoner and northwestern Cherokee Counties through
1100 PM CDT...

At 1010 PM CDT, Doppler radar indicated a strong thunderstorm 3 miles
southwest of Locust Grove, moving northeast at 40 mph.

HAZARD...Wind gusts up to 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down small tree limbs and blow
         around unsecured objects. Minor damage to outdoor objects
         is possible.

Locations in or near the path include...
Wagoner...                        Jay...
Chouteau...                       Locust Grove...
Salina...                         Colcord...
Kansas...                         Okay...
Spavinaw...                       Oaks...
Peggs...                          Rose...
Leach...                          Chloeta...
Twin Oaks...                      Sequoyah State Park...
Sportsmen Acres Community...      Dodge...
Mazie...                          Lake Eucha State Park...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northeastern and east central Oklahoma.

&&

LAT...LON 3631 9460 3583 9532 3602 9554 3608 9547
      3608 9544 3610 9544 3656 9484 3657 9463
TIME...MOT...LOC 0310Z 234DEG 33KT 3616 9520

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

69

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 10:11 PM CDT	Special Weather Statement	TSA	Delaware	49 min
May 20, 11:39 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware	66 min
May 20, 11:52 PM CDT	Special Weather Statement	TSA	Delaware	23 min
May 21, 2:08 AM CDT	Special Weather Statement	TSA	Osage	52 min
May 21, 2:29 AM CDT	Special Weather Statement	TSA	Pawnee	31 min
May 21, 2:39 AM CDT	Special Weather Statement	TSA	Washington	51 min
May 21, 2:57 AM CDT	Special Weather Statement	TSA	Osage	48 min
May 21, 3:32 AM CDT	Special Weather Statement	TSA	Nowata, Washington	28 min
May 21, 3:34 AM CDT	Special Weather Statement	TSA	Pawnee	26 min
May 21, 3:42 AM CDT	Special Weather Statement	TSA	Okmulgee, Rogers	33 min
May 21, 3:55 AM CDT	Special Weather Statement	TSA	Osage	35 min
May 21, 3:59 AM CDT	Special Weather Statement	TSA	Nowata	46 min
May 21, 4:01 AM CDT	Special Weather Statement	TSA	Pawnee	29 min
May 21, 4:03 AM CDT	Special Weather Statement	TSA	Mayes, Muskogee, Rogers, Wagoner	27 min
May 21, 4:32 AM CDT	Special Weather Statement	TSA	Mayes, Wagoner	43 min
May 21, 5:15 AM CDT	Areal Flood Advisory	TSA	Adair, Cherokee, Craig, Delaware, Mayes, Nowata and 6 more	3 hr
May 21, 5:25 AM CDT	Special Weather Statement	TSA	Creek, Tulsa	35 min
May 21, 6:13 AM CDT	Special Weather Statement	TSA	Rogers, Wagoner	32 min
May 21, 6:35 AM CDT	Special Weather Statement	TSA	Mayes	25 min
May 21, 6:39 AM CDT	Flash Flood Warning	TSA	Craig, Mayes	3 hr
May 21, 6:56 AM CDT	Special Weather Statement	TSA	Delaware	34 min
May 21, 7:08 AM CDT	Special Weather Statement	TSA	Delaware	37 min
May 21, 12:06 AM CDT	Special Weather Statement	TSA	Benton	54 min
May 21, 12:17 AM CDT	Severe Thunderstorm Warning	TSA	Benton, Washington	37 min
May 21, 12:57 AM CDT	Special Weather Statement	TSA	Benton	48 min
May 21, 2:14 PM CDT	Special Weather Statement	TSA	Madison	31 min
May 21, 2:21 PM CDT	Special Weather Statement	TSA	Carroll	24 min
May 21, 2:50 PM CDT	Special Weather Statement	TSA	Carroll	40 min
May 21, 3:01 PM CDT	Special Weather Statement	TSA	Madison	44 min
May 21, 3:09 PM CDT	Special Weather Statement	TSA	Carroll	21 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2022 Every severe thunderstorm warning in 2022

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.