Alert archive / Oklahoma / Special Weather Statements in 2018

Special Weather Statement, NWS Norman, OK

August 7, 2018Marshall County, Oklahoma

NWS Norman, OK issued this special weather statement at Aug 7, 2018, 9:45 PM CDT for Marshall 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
Aug 7, 2018, 9:45 PM CDT (02:45 UTC)
Expired
Aug 7, 2018, 10:15 PM CDT
In force
30 min
Issued by
NWS Norman, OK

County Marshall County, OK

The radar

The Dallas/Ft Worth radar (KFWS), 154 km from the middle of the area, began a volume at 02:47 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

Norman, OK (KOUN), launched 00:00Z, 2.8 hours before the alert went out and 150 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2018-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1782 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2018-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1782 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1640 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
195 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.4

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 Norman, OK wrote its last area forecast discussion before this special weather statement went out at Aug 7, 8:10 PM CDT, 1 hour 35 minutes earlier.

Area forecast discussion, Aug 7, 8:10 PM CDT, 1 hour 35 minutes before
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Hazardous weather outlook, Aug 7, 8:23 PM CDT, 1 hour 22 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
823 PM CDT Tue Aug 7 2018

OKZ004>048-050>052-TXZ083>090-090130-
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-
823 PM CDT Tue Aug 7 2018

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...Rest of Tonight...

.Thunderstorms...
Scattered showers and thunderstorms will continue to develop and
move across portions of southern Oklahoma this evening. Gusty
winds, frequent lightning, and heavy rain will be the main
concerns with these storms.

Additional storms will be possible across portions of Oklahoma and
western north Texas overnight into Wednesday morning, mainly
toward and after midnight. A few of these storms could become
strong producing gusty winds. Heavy rain and cloud to ground
lightning will also be concerns overnight into Wednesday morning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

.Thunderstorms...
Thunderstorms will be possible across most of the area Wednesday
and Thursday. The highest chances for thunderstorms are expected
early Wednesday morning, and late Wednesday night into early
Thursday morning. A few strong to severe storms will be possible
Wednesday across southwest Oklahoma and portions of western north
Texas, with a threat of damaging wind gusts.

At least a low chance for thunderstorms will continue through
Sunday, especially across the southern half of Oklahoma and
adjacent parts of north Texas.

.Heavy Rainfall...
Heavy rainfall will be possible across the northern two-thirds of
Oklahoma Wednesday morning, and then again Wednesday night into
early Thursday morning across the southern two thirds of
Oklahoma. Excessive rainfall may lead to localized flooding.

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

In the hours before

Special weather statement, Aug 7, 7:17 PM CDT, 2 hours 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
717 PM CDT TUE AUG 7 2018

OKZ039-080045-
Stephens OK-
717 PM CDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Stephens County
Until 745 PM CDT....

AT 714 PM CDT, a strong thunderstorm was located 4 miles northeast of
Loco. This storm was nearly stationary.

HAZARDS INCLUDE...
Wind gusts to 45 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3432 9770 3447 9773 3447 9756 3429 9756
TIME...MOT...LOC 0014Z 98DEG 1KT 3439 9765

BRB
Special weather statement, Aug 7, 7:31 PM CDT, 2 hours 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
731 PM CDT TUE AUG 7 2018

OKZ026-030-031-080100-
Pottawatomie OK-Seminole OK-Lincoln OK-
731 PM CDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR northeastern Pottawatomie...
northern Seminole and southeastern Lincoln Counties Until 800 PM
CDT....

AT 728 PM CDT, a strong thunderstorm was located near Little, moving
northeast at 30 MPH.

HAZARDS INCLUDE...
Wind gusts to 45 MPH...

LAT...LON 3526 9671 3541 9684 3557 9663 3540 9662
      3540 9660 3541 9658 3539 9655 3539 9653
      3542 9656 3543 9656 3544 9657 3545 9655
      3546 9654 3543 9651 3543 9649 3546 9648
      3545 9644 3538 9644
TIME...MOT...LOC 0028Z 241DEG 24KT 3537 9666

RS
Special weather statement, Aug 7, 7:49 PM CDT, 1 hour 56 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
749 PM CDT TUE AUG 7 2018

OKZ042-047-080115-
Johnston OK-Pontotoc OK-
749 PM CDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR north central Johnston and south
central Pontotoc Counties Until 815 PM CDT....

AT 747 PM CDT, a strong thunderstorm was located 5 miles southeast of
Roff, moving southeast at 5 MPH.

HAZARDS INCLUDE...
Wind gusts to 45 MPH...

Locations impacted include...
Pontotoc.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3443 9680 3458 9683 3459 9683 3465 9673
      3450 9655
TIME...MOT...LOC 0047Z 319DEG 6KT 3458 9676

BRB
Special weather statement, Aug 7, 8:17 PM CDT, 1 hour 28 minutes before
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Special weather statement, Aug 7, 8:38 PM CDT, 1 hour 7 minutes before
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Special weather statement, Aug 7, 9:45 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
945 PM CDT TUE AUG 7 2018

OKZ046-047-050-051-080315-
Love OK-Carter OK-Johnston OK-Marshall OK-
945 PM CDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR northeastern Love...southeastern
Carter...southwestern Johnston and western Marshall Counties Until
1015 PM CDT....

AT 940 PM CDT, strong thunderstorms extended from near Ardmore to
near Mannsville, moving south at 35 MPH.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...
Frequent cloud to ground lightning...

LAT...LON 3422 9720 3421 9683 3389 9668 3384 9670
      3383 9676 3386 9678 3387 9681 3385 9685
      3387 9689 3395 9691 3396 9693 3394 9697
      3395 9698 3386 9701 3384 9704 3386 9708
      3384 9709 3382 9705 3380 9709
TIME...MOT...LOC 0240Z 344DEG 28KT 3411 9691

RS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 7:17 PM CDTSpecial Weather StatementOUNStephens28 min
Aug 7, 7:31 PM CDTSpecial Weather StatementOUNSeminole29 min
Aug 7, 7:49 PM CDTSpecial Weather StatementOUNPontotoc26 min
Aug 7, 8:17 PM CDTSpecial Weather StatementOUNStephens28 min
Aug 7, 8:38 PM CDTSpecial Weather StatementOUNJohnston22 min
Aug 8, 2:03 AM CDTSpecial Weather StatementOUNPottawatomie42 min
Aug 8, 2:15 AM CDTFlood WatchOUNBlaine, Canadian, Cleveland, Garfield, Kingfisher, Lincoln and 5 more9 hr
Aug 8, 2:17 AM CDTAreal Flood AdvisoryOUNCleveland, Oklahoma3 hr
Aug 8, 2:23 AM CDTSpecial Weather StatementOUNOklahoma52 min
Aug 8, 2:26 AM CDTSpecial Weather StatementOUNWoods49 min
Aug 8, 2:32 AM CDTSevere Thunderstorm WarningOUNWoods22 min
Aug 8, 2:38 AM CDTAreal Flood AdvisoryOUNCanadian, Kingfisher, Logan, Oklahoma3 hr
Aug 8, 2:39 AM CDTSevere Thunderstorm WarningOUNKingfisher51 min
Aug 8, 2:43 AM CDTSpecial Weather StatementOUNCleveland32 min
Aug 8, 3:01 AM CDTFlash Flood WarningOUNCanadian, Kingfisher6 hr
Aug 8, 3:13 AM CDTSevere Thunderstorm WarningOUNCanadian, Oklahoma47 min
Aug 8, 3:14 AM CDTSpecial Weather StatementOUNPottawatomie31 min
Aug 8, 3:16 AM CDTSpecial Weather StatementOUNCleveland29 min
Aug 8, 3:21 AM CDTSpecial Weather StatementOUNHarper, Woods39 min
Aug 8, 3:27 AM CDTSpecial Weather StatementOUNMajor48 min
Aug 8, 3:46 AM CDTFlash Flood WarningOUNCanadian, Oklahoma6 hr
Aug 8, 3:54 AM CDTSpecial Weather StatementOUNMajor51 min
Aug 8, 3:56 AM CDTSpecial Weather StatementOUNWoods, Woodward49 min
Aug 8, 4:06 AM CDTSevere Thunderstorm WarningOUNBlaine, Garfield, Kingfisher, Major54 min
Aug 8, 4:28 AM CDTAreal Flood AdvisoryOUNCanadian, Cleveland, Grady, McClain, Oklahoma3 hr
Aug 8, 4:42 AM CDTFlash Flood WarningOUNCleveland3 hr
Aug 8, 4:56 AM CDTAreal Flood AdvisoryOUNBlaine, Dewey, Garfield, Kingfisher, Major3 hr
Aug 8, 5:07 AM CDTSpecial Weather StatementOUNCleveland23 min
Aug 8, 5:14 AM CDTSpecial Weather StatementOUNBlaine, Canadian, Kingfisher, Logan, Oklahoma61 min
Aug 8, 5:21 AM CDTAreal Flood AdvisoryOUNCleveland, Pottawatomie3 hr
Aug 8, 5:46 AM CDTSpecial Weather StatementOUNPottawatomie44 min
Aug 8, 5:50 AM CDTSpecial Weather StatementOUNEllis, Harper, Woods, Woodward55 min
Aug 8, 5:54 AM CDTAreal Flood AdvisoryOUNBlaine, Caddo, Canadian, Custer, Dewey, Kingfisher3 hr
Aug 8, 6:10 AM CDTSpecial Weather StatementOUNOklahoma35 min
Aug 8, 6:20 AM CDTAreal Flood AdvisoryOUNOklahoma3 hr
Aug 8, 6:24 AM CDTAreal Flood AdvisoryOUNEllis, Harper, Woods, Woodward3 hr
Aug 8, 6:34 AM CDTSpecial Weather StatementOUNHughes26 min
Aug 8, 7:20 AM CDTSpecial Weather StatementOUNCarter25 min
Aug 8, 7:31 AM CDTAreal Flood AdvisoryOUNCleveland, McClain3 hr
Aug 8, 7:41 AM CDTAreal Flood AdvisoryOUNCoal3 hr
Aug 8, 7:47 AM CDTSpecial Weather StatementOUNCoal28 min

Nearby

Special Weather Statements in Oklahoma, 2018Every 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.