Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 485, NWS Norman, OK

July 30, 2018Lincoln County, Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 30, 2018, 3:43 AM CDT for Lincoln County, Pottawatomie County, Oklahoma. It was in force for 62 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, 2018, 3:43 AM CDT (08:43 UTC)
Expired: Jul 30, 2018, 4:45 AM CDT
In force: 62 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Lincoln County, OK, Pottawatomie County, OK

The radar

The Norman radar (KTLX), 36 km from the middle of the area, began a volume at 08:45 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
Jul 29, 10:04 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 8.7 hours before the alert went out and 51 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: 1506 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1518 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.2

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, 3:02 AM CDT, 41 minutes earlier.

Area forecast discussion, Jul 30, 3:02 AM CDT, 41 minutes before

Area Forecast Discussion
National Weather Service Norman OK
302 AM CDT Mon Jul 30 2018

.DISCUSSION...
The main forecast concern for this period is lingering showers and
storms through the day today.

An MCS is currently making its way now through Oklahoma and western
north Texas. This activity should continue southward, generally
decreasing in intensity. After the passage of this system, the
environment this afternoon will be pretty well worked over limiting
precipitation chances for that period. However, there will still be
some lingering instability, moisture, and shear, as well as the
500mb trough coming through late afternoon / evening, so leaving
some slight chances POPs seems justified. Maximum temperatures will
be in the 80s as cool air flows in behind the front and extensive
cloud cover from this morning's convection persists.

Cooler than normal temperatures will be the rule for the next
several days as northerly flow takes over. Another shortwave will
bring some slight chances for rain Wednesday night and Thursday
night mainly across western Oklahoma.

As we move into late week, the ridge begins to build back. This
should bring drier weather with a gradual warming trend. Models hint
at more overnight storm complexes making it into northwest Oklahoma,
but with how far out that is in the forecast and with the ridge
building back in, not confident enough to put any mentionable POPs
at this point in time.

Day

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  80  64  84  64 /  50  10   0   0
Hobart OK         83  64  87  65 /  30  10   0   0
Wichita Falls TX  85  68  89  67 /  50  20   0   0
Gage OK           80  61  83  63 /  30   0   0   0
Ponca City OK     80  61  84  62 /  30  10  10   0
Durant OK         83  67  87  66 /  80  20   0   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...None.
TX...None.
&&

23/14

Hazardous weather outlook, Jul 29, 3:15 PM CDT, 12 hours 28 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
315 PM CDT Sun Jul 29 2018

OKZ004>048-050>052-TXZ083>090-302015-
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-
315 PM CDT Sun Jul 29 2018

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 Slight Risk for severe thunderstorms across portions
of northern and central Oklahoma tonight.

Location...
The Slight Risk is north of line from near Altus, to Duncan to
Holdenville, Oklahoma. A Marginal Risk covers the rest of Oklahoma
and parts of north Texas, generally north of a line from near
Crowell to Henrietta, Texas.

Timing...
The most likely time for severe thunderstorms will be 11 PM this
evening to 4 AM Monday morning.

Impacts...
Damaging wind gusts up to 80 mph.
Hail up the size of quarters.

Discussion...
A complex of thunderstorms is expected to move into northern
Oklahoma tonight and move southeastward across the state.
Thunderstorms should gradualy weaken as they move toward southern
Oklahoma and the Red River.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...
Storm spotter groups and emergency management personnel across
northern and central Oklahoma should prepare for severe weather
operations tonight.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

.Thunderstorms...
Thunderstorms are expected to continue Monday and Monday night.

There is a chance of thunderstorms across western Oklahoma and
adjacent parts of north Texas Wednesday into Thursday.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

Mahale

In the hours before

Local storm report, Jul 30, 3:15 AM CDT, 28 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, 3:16 AM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
316 AM CDT MON JUL 30 2018

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

0310 AM     TSTM WND GST     2 N YUKON               35.53N 97.74W
07/30/2018  M73 MPH          CANADIAN           OK   MESONET

&&

MAD

Special weather statement, Jul 30, 3:22 AM CDT, 21 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
322 AM CDT MON JUL 30 2018

OKZ043-300845-
Coal OK-
322 AM CDT MON JUL 30 2018

...SIGNIFICANT WEATHER ADVISORY FOR southern Coal County Until 345 AM
CDT....

AT 320 AM CDT, a strong thunderstorm was located near Bromide, moving
east at 25 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 40 MPH...

Locations impacted include...
Coalgate, Lehigh, Bromide, Olney, Clarita and Phillips.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3442 9651 3454 9651 3464 9620 3442 9614
TIME...MOT...LOC 0820Z 257DEG 24KT 3445 9651

BRB

Local storm report, Jul 30, 3:23 AM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
323 AM CDT MON JUL 30 2018

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

0315 AM     TSTM WND GST     2 N YUKON               35.53N 97.74W
07/30/2018  M62 MPH          CANADIAN           OK   MESONET

&&

MAD

Local storm report, Jul 30, 3:26 AM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
326 AM CDT MON JUL 30 2018

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

0259 AM     TSTM WND GST     3 NNW FORT COBB RESERVO 35.24N 98.50W
07/30/2018  M64 MPH          CADDO              OK   PUBLIC

            CWOP STATION D2113, 3 NNW FORT COBB
            RESERVOIR.

&&

MAD

Special weather statement, Jul 30, 3:28 AM CDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
328 AM CDT MON JUL 30 2018

OKZ023-027-028-035-037-038-300900-
Grady OK-Kiowa OK-Tillman OK-Caddo OK-McClain OK-Comanche OK-
328 AM CDT MON JUL 30 2018

...SIGNIFICANT WEATHER ADVISORY FOR Grady...southeastern Kiowa...
north central Tillman...southern Caddo...west central McClain and
Comanche Counties Until 400 AM CDT....

AT 325 AM CDT, strong thunderstorms were along a line extending from
near Tuttle to near Anadarko to near Tom Steed Reservoir, moving
southeast at 20 MPH.

HAZARDS INCLUDE...
Wind gusts over 50 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3481 9904 3534 9785 3534 9780 3507 9738
      3467 9815 3446 9901
TIME...MOT...LOC 0825Z 325DEG 17KT 3530 9781 3507 9824 3476 9899

BRB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 11:10 PM CDT	Special Weather Statement	OUN	Woods	20 min
Jul 29, 11:30 PM CDT	Special Weather Statement	OUN	Woods	30 min
Jul 29, 11:32 PM CDT	Special Weather Statement	OUN	Harper	28 min
Jul 30, 12:00 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	45 min
Jul 30, 12:05 AM CDT	Special Weather Statement	OUN	Ellis, Woodward	25 min
Jul 30, 12:15 AM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	45 min
Jul 30, 12:23 AM CDT	Special Weather Statement	OUN	Major	22 min
Jul 30, 12:29 AM CDT	Severe Thunderstorm Warning	OUN	Major, Woods	46 min
Jul 30, 12:43 AM CDT	Severe Thunderstorm Warning	OUN	Major	47 min
Jul 30, 1:07 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Garfield, Kingfisher	53 min
Jul 30, 1:12 AM CDT	Special Weather Statement	OUN	Dewey	33 min
Jul 30, 1:23 AM CDT	Special Weather Statement	OUN	Garfield	22 min
Jul 30, 1:46 AM CDT	Special Weather Statement	OUN	Custer, Dewey	29 min
Jul 30, 1:57 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Kingfisher	48 min
Jul 30, 2:13 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Washita	47 min
Jul 30, 2:15 AM CDT	Special Weather Statement	OUN	Beckham, Custer, Roger Mills, Washita	30 min
Jul 30, 2:26 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Kingfisher, Logan, McClain and 1 more	79 min
Jul 30, 2:53 AM CDT	Special Weather Statement	OUN	Caddo, Comanche, Grady, Kiowa	37 min
Jul 30, 3:04 AM CDT	Areal Flood Advisory	OUN	Oklahoma	116 min
Jul 30, 3:09 AM CDT	Special Weather Statement	OUN	Johnston	21 min
Jul 30, 3:22 AM CDT	Special Weather Statement	OUN	Coal	23 min
Jul 30, 3:28 AM CDT	Special Weather Statement	OUN	Comanche, Grady	32 min
Jul 30, 3:46 AM CDT	Special Weather Statement	OUN	Cleveland, Oklahoma	44 min
Jul 30, 4:00 AM CDT	Special Weather Statement	OUN	Comanche, Garvin, McClain, Stephens	30 min
Jul 30, 4:14 AM CDT	Special Weather Statement	OUN	Tillman	31 min
Jul 30, 4:33 AM CDT	Special Weather Statement	OUN	Murray, Pontotoc, Seminole	27 min
Jul 30, 4:37 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Jefferson, Murray, Stephens	38 min
Jul 30, 4:41 AM CDT	Special Weather Statement	OUN	Cotton, Jefferson, Stephens	34 min
Jul 30, 4:46 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc, Pottawatomie, Seminole	44 min
Jul 30, 5:16 AM CDT	Special Weather Statement	OUN	Carter, Johnston, Love, Marshall, Murray	29 min
Jul 30, 5:18 AM CDT	Special Weather Statement	OUN	Jefferson	27 min
Jul 30, 5:29 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Johnston, Pontotoc, Seminole	46 min
Jul 30, 5:50 AM CDT	Special Weather Statement	OUN	Johnston, Love, Marshall	25 min
Jul 30, 6:10 AM CDT	Special Weather Statement	OUN	Atoka, Bryan	35 min
Jul 30, 6:45 AM CDT	Special Weather Statement	OUN	Bryan	45 min
Jul 30, 1:43 PM CDT	Special Weather Statement	OUN	Kay	47 min
Jul 30, 1:52 PM CDT	Severe Thunderstorm Warning	OUN	Kay	53 min
Jul 30, 1:59 PM CDT	Tornado Warning	OUN	Kay	16 min
Jul 30, 2:18 PM CDT	Special Weather Statement	OUN	Grant	42 min
Jul 30, 2:58 PM CDT	Special Weather Statement	OUN	Garfield, Noble	47 min
Jul 30, 3:16 PM CDT	Special Weather Statement	OUN	Payne	29 min
Jul 30, 3:22 PM CDT	Severe Thunderstorm Warning	OUN	Payne	53 min
Jul 30, 3:59 PM CDT	Special Weather Statement	OUN	Lincoln	31 min
Jul 30, 5:05 AM CDT	Special Weather Statement	OUN	Clay, Wichita	25 min
Jul 30, 5:20 AM CDT	Special Weather Statement	OUN	Baylor	25 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018 Every severe thunderstorm warning 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.