Alert archive / Oklahoma / Special Weather Statements in 2018

Special Weather Statement, NWS Tulsa, OK

October 7, 2018Sequoyah County, Oklahoma

NWS Tulsa, OK issued this special weather statement at Oct 7, 2018, 12:39 PM CDT for Sequoyah County, Oklahoma. It was in force for 51 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: Oct 7, 2018, 12:39 PM CDT (17:39 UTC)
Expired: Oct 7, 2018, 1:30 PM CDT
In force: 51 min
Issued by: NWS Tulsa, OK

County Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 66 km from the middle of the area, began a volume at 17:41 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 12:00Z, 5.7 hours before the alert went out and 185 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: 723 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 857 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted.

<!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>

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 Oct 7, 12:33 PM CDT, 6 minutes earlier.

Area forecast discussion, Oct 7, 12:33 PM CDT, 6 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
1233 PM CDT Sun Oct 7 2018

.AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
IFR/LIFR cigs will persist for the northeast OK TAF sites through
much of the afternoon with some improvement expected toward 00Z.
Scattered convection should continue for the afternoon and could
see some redevelopment later tonight especially across northeast
OK.

&&

.PREV DISCUSSION... /Issued 1054 AM CDT Sun Oct 7 2018/

..UPDATE...

DISCUSSION...
Scatteed areas of convection continue late this morning ahead of
a slowly retreating frontal boundary, with the greatest coverage
generally across northeast OK. CAM solutions suggest that the
activity will become more scattered going into the afternoon,
although the risk of locally heavy rain and isolated strong winds
will persist.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   71  81  70  79 /  40  20  40  80
FSM   68  85  69  83 /  20  10  20  30
MLC   71  82  70  78 /  40  20  20  60
BVO   69  81  69  77 /  50  30  50  80
FYV   69  81  68  79 /  20  10  20  30
BYV   68  83  68  81 /  20  10  10  30
MKO   69  83  69  80 /  30  10  20  50
MIO   69  82  69  79 /  40  20  20  50
F10   69  82  69  78 /  40  20  30  80
HHW   69  83  69  80 /  30  20  20  50

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...None.
AR...None.
&&

AVIATION.....18

Hazardous weather outlook, Oct 7, 5:27 AM CDT, 7 hours 12 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>

In the hours before

Special weather statement, Oct 7, 12:39 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1239 PM CDT SUN OCT 7 2018

OKZ068-070-072-071830-
Muskogee OK-Sequoyah OK-Cherokee OK-
1239 PM CDT SUN OCT 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SEQUOYAH...
SOUTHEASTERN CHEROKEE AND EAST CENTRAL MUSKOGEE COUNTIES UNTIL 130 PM
CDT...

At 1239 PM CDT, a strong thunderstorm was located near Webbers Falls,
moving northeast at 25 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations in or near the path include...
Vian...                           Gore...
Webbers Falls...                  Cookson...
Cherokee Landing State Park...    Greenleaf State Park...
Pumpkin Center...                 Lake Tenkiller State Park...
Box...

This includes Interstate 40 in Oklahoma between mile markers 280 and
294.

LAT...LON 3577 9481 3575 9481 3544 9502 3545 9502
      3546 9504 3545 9506 3543 9508 3541 9508
      3540 9510 3545 9526 3586 9508
TIME...MOT...LOC 1739Z 208DEG 24KT 3548 9513

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 12:55 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Sequoyah	50 min
Oct 7, 1:45 PM CDT	Tornado Warning	TSA	Adair, Cherokee	30 min
Oct 7, 2:15 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Delaware	45 min
Oct 7, 2:41 PM CDT	Severe Thunderstorm Warning	TSA	Adair	34 min
Oct 7, 3:03 PM CDT	Severe Thunderstorm Warning	TSA	Adair	42 min
Oct 7, 4:24 PM CDT	Special Weather Statement	TSA	Latimer	36 min
Oct 7, 5:43 PM CDT	Special Weather Statement	TSA	Pushmataha	47 min
Oct 7, 6:20 PM CDT	Special Weather Statement	TSA	Pittsburg	40 min
Oct 7, 6:39 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	51 min
Oct 7, 2:59 PM CDT	Special Weather Statement	TSA	Benton	46 min
Oct 7, 3:45 PM CDT	Special Weather Statement	TSA	Benton	30 min

Nearby

Special Weather Statements in Oklahoma, 2018 Every special weather statement in 2018

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.