Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Tulsa, OK

September 20, 2021Ottawa County, Oklahoma

NWS Tulsa, OK issued this special weather statement at Sep 20, 2021, 9:45 PM CDT for Ottawa County, Oklahoma. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 20, 2021, 9:45 PM CDT (02:45 UTC)
Expired: Sep 20, 2021, 10:15 PM CDT
In force: 30 min
Issued by: NWS Tulsa, OK
Hail: 0.00 in
Wind: 40

County Ottawa County, OK

The radar

The Tulsa radar (KINX), 102 km from the middle of the area, began a volume at 02:49 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

Springfield, MO (KSGF), launched 00:00Z, 2.8 hours before the alert went out and 87 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: 842 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1973 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Sep 20, 7:30 PM CDT, 2 hours 15 minutes earlier.

Area forecast discussion, Sep 20, 7:30 PM CDT, 2 hours 15 minutes before

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<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>
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Hazardous weather outlook, Sep 20, 4:43 PM CDT, 5 hours 2 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
443 PM CDT Mon Sep 20 2021

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-
443 PM CDT Mon Sep 20 2021

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

.DAY ONE...This Afternoon and Tonight.

SEVERE THUNDERSTORM.
	RISK...Limited.
	AREA...Far Northeast Oklahoma; Northwest Arkansas.
	ONSET...After 7 PM.

HEAVY RAIN.
	RISK...Limited.
	AREA...Far Northeast Oklahoma; Northwest Arkansas.
	ONSET...After 7 PM.

SIGNIFICANT WINDS.
	RISK...Limited.
	AREA...Eastern Oklahoma; Western Arkansas.
	ONSET...Ongoing.

FIRE WEATHER DANGER.
	RISK...Elevated.
	AREA...West of highway 75.
	ONSET...Ongoing.

DISCUSSION...

South to southwest winds gusting to 30 mph, combined with above
average temps and low humidity, are yielding elevated fire weather
danger conditions across northeast Oklahoma this afternoon.
Conditions will improve some toward sunset, however an abrupt wind
shift and increase wind and gusts are expected behind a cold front
this evening.

There is a limited risk of severe storms this evening across far
northeast Oklahoma into northwest Arkansas in association with a
cold front. Damaging winds 60 to 70 mph is the main threat,
especially if storms can congeal into one or more lines and bow
out. Marginally severe hail is possible with initial storms that
develop, but should quickly transition to the wind threat. Some
locally heavy rainfall between 1 and 2 inches is possible, but
should not yield a flood threat due to dry soil conditions.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Local Spotter Activation May Be Needed.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
TUESDAY...Thunderstorm Potential...High Wind Potential.
WEDNESDAY thru SUNDAY...No Hazards.

EXTENDED DISCUSSION...

Isolated to scattered storms will remain possible behind the cold
front Tuesday morning thru around midday before this potential
shifts southeast out of the region. Severe weather is not expected
with these storms. Winds will gust out of the north up to 30 mph
behind the front, yielding at least limited fire spread potential.

weather.gov/tulsa contains additional information.

Lacy

In the hours before

Special weather statement, Sep 20, 9:45 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Tulsa OK
945 PM CDT Mon Sep 20 2021

OKZ058-210315-
Ottawa OK-
945 PM CDT Mon Sep 20 2021

...Strong thunderstorms will impact portions of Ottawa County through
1015 PM CDT...

At 944 PM CDT, Doppler radar indicated strong thunderstorms along a
line extending from 2 miles northeast of Quapaw to Narcissa. Movement
was east at 30 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations in or near the path include...
Miami...                          Baxter Springs...
Commerce...                       Fairland...
Quapaw...                         Wyandotte...
Picher...                         Narcissa...
Ottawa...                         Peoria...
Twin Bridges State Park...

This includes Interstate 44 between mile markers 297 and 324.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3700 9462 3667 9462 3667 9475 3673 9500
      3678 9500 3700 9482
TIME...MOT...LOC 0244Z 278DEG 27KT 3698 9477 3679 9492

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Lacy

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 11:21 PM CDT	Special Weather Statement	TSA	Delaware, Mayes	39 min
Sep 21, 1:29 AM CDT	Severe Thunderstorm Warning	TSA	Adair	46 min
Sep 20, 11:44 PM CDT	Severe Thunderstorm Warning	TSA	Benton	46 min
Sep 21, 12:12 AM CDT	Special Weather Statement	TSA	Benton	33 min
Sep 21, 12:46 AM CDT	Special Weather Statement	TSA	Benton, Carroll	44 min
Sep 21, 1:17 AM CDT	Special Weather Statement	TSA	Washington	43 min
Sep 21, 2:11 AM CDT	Severe Thunderstorm Warning	TSA	Washington	32 min

Nearby

Special Weather Statements in Oklahoma, 2021 Every special weather statement in 2021

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.