Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Tulsa, OK

August 13, 2021Washington County, Oklahoma

NWS Tulsa, OK issued this special weather statement at Aug 13, 2021, 6:12 AM CDT for Washington County, Oklahoma. It was in force for 33 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: Aug 13, 2021, 6:12 AM CDT (11:12 UTC)
Expired: Aug 13, 2021, 6:45 AM CDT
In force: 33 min
Issued by: NWS Tulsa, OK
Hail: 0.75 in
Wind: 40

County Washington County, OK

The radar

The Tulsa radar (KINX), 57 km from the middle of the area, began a volume at 11:13 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, 11.2 hours before the alert went out and 189 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: 2669 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1774 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 13, 3:00 AM CDT, 3 hours 12 minutes earlier.

Area forecast discussion, Aug 13, 3:00 AM CDT, 3 hours 12 minutes before

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<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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.
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Hazardous weather outlook, Aug 13, 4:44 AM CDT, 1 hour 28 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
444 AM CDT Fri Aug 13 2021

ARZ001-002-010-011-019-020-029-OKZ049-053>076-140945-
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-
444 AM CDT Fri Aug 13 2021

...STRONG TO MARGINALLY SEVERE STORMS POSSIBLE TODAY...

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

.DAY ONE...Today and Tonight.

SEVERE THUNDERSTORM.
	RISK...Limited.
	AREA... Northeast Oklahoma into far northwest Arkansas.
	ONSET... This morning and again this afternoon.

HEAVY RAIN.
	RISK...Limited.
	AREA... Northeast Oklahoma into far northwest Arkansas.
	ONSET... This afternoon.

DANGEROUS HEAT.
	RISK...Elevated.
	AREA... Eastern Oklahoma into northwest Arkansas.
	ONSET... This afternoon.

    AREA AT GREATEST RISK... Northeast Oklahoma.

DISCUSSION...
A complex of storms in Kansas will continue to slide southward
this morning into northeast Oklahoma and far northwest Arkansas.
These storms will likely exhibit a weakening trend as they move
into the area, but there still remains a chance for a strong to
severe storm. This afternoon will present the best chances for
strong to severe storms as a remnant outflow boundary stalls
across parts of northeast Oklahoma and far northwest Arkansas.
This boundary will be the trigger for storms by mid afternoon with
damaging wind gusts the main severe hazard. Given the slow storm
motions this afternoon, locally heavy rainfall will be possible.
This may lead to localized flooding concerns this afternoon and
evening.

The aforementioned outflow boundary (along with cloud cover and
shower and storm activity) will play a big role in terms of the
heat and humidity. Moisture will likely pool where the outflow
boundary stalls (likely northeast Oklahoma based on the latest
available guidance) which will locally elevated the heat index.
Locations within the pooling of moisture can expect heat indices
to be in the 102 to 108 range this afternoon. A Heat Advisory may
be needed today. Regardless, continue to practice your heat
safety precautions.

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

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
SATURDAY THROUGH THURSDAY...Thunderstorm Potential.

EXTENDED DISCUSSION...
Daily showers and storms will be present starting today and
continuing through the end of the upcoming work week. Multiple
upper disturbances will swing through the area which will have
many subtle boundaries and ample moisture. Saturday, outside of
today, will see the best chance for a strong to severe storm to
develop. Also, given the weak mid to upper flow pattern, storms
through the week will likely be slow movers and will dump locally
heavy rain. Rainfall trends will continue to be monitored through
the week.

weather.gov/tulsa contains additional information.

Snider

In the hours before

Special weather statement, Aug 13, 6:12 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Tulsa OK
612 AM CDT Fri Aug 13 2021

OKZ055-131145-
Washington OK-
612 AM CDT Fri Aug 13 2021

...A strong thunderstorm will impact portions of southern Washington
County through 645 AM CDT...

At 611 AM CDT, Doppler radar indicated a strong thunderstorm 3 miles
east of Ochelata, moving southeast at 10 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

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

Locations in or near the path include...
Bartlesville...                   Ramona...
Ochelata...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3670 9581 3652 9581 3647 9582 3654 9597
      3660 9600 3665 9600 3673 9591
TIME...MOT...LOC 1111Z 309DEG 9KT 3659 9593

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 6:43 AM CDT	Special Weather Statement	TSA	Nowata	17 min
Aug 13, 7:41 AM CDT	Special Weather Statement	TSA	Nowata	34 min
Aug 13, 8:27 AM CDT	Special Weather Statement	TSA	Rogers	33 min
Aug 13, 2:16 PM CDT	Heat Advisory	TSA	Cherokee, Creek, Haskell, McIntosh, Muskogee, Okfuskee and 4 more	4 hr
Aug 13, 4:36 PM CDT	Special Weather Statement	TSA	Cherokee	24 min
Aug 13, 4:38 PM CDT	Special Weather Statement	TSA	Tulsa	37 min
Aug 13, 4:49 PM CDT	Special Weather Statement	TSA	Okfuskee	26 min
Aug 13, 5:13 PM CDT	Special Weather Statement	TSA	Adair, Cherokee	47 min
Aug 13, 5:24 PM CDT	Special Weather Statement	TSA	Tulsa	36 min
Aug 13, 5:26 PM CDT	Areal Flood Advisory	TSA	Tulsa	3 hr
Aug 13, 5:29 PM CDT	Special Weather Statement	TSA	Creek	31 min
Aug 13, 5:52 PM CDT	Special Weather Statement	TSA	Tulsa	38 min
Aug 13, 6:03 PM CDT	Flash Flood Warning	TSA	Creek, Tulsa	3 hr
Aug 13, 6:09 PM CDT	Special Weather Statement	TSA	Muskogee	36 min
Aug 13, 6:33 PM CDT	Special Weather Statement	TSA	Muskogee	42 min
Aug 13, 6:34 PM CDT	Special Weather Statement	TSA	Wagoner	41 min
Aug 13, 3:55 PM CDT	Special Weather Statement	TSA	Benton	50 min
Aug 13, 4:03 PM CDT	Severe Thunderstorm Warning	TSA	Benton	42 min
Aug 13, 4:25 PM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll, Madison, Washington	50 min
Aug 13, 5:09 PM CDT	Areal Flood Advisory	TSA	Benton	3 hr
Aug 13, 5:18 PM CDT	Flash Flood Warning	TSA	Benton	3 hr

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.