Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 442, NWS Norman, OK

July 6, 2018Tillman County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 6, 2018, 2:06 PM CDT for Tillman County, Oklahoma. It was in force for 24 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 6, 2018, 2:06 PM CDT (19:06 UTC)
Expired
Jul 6, 2018, 2:30 PM CDT
In force
24 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Tillman County, OK

The radar

The Altus AFB radar (KFDR), 5 km from the middle of the area, began a volume at 19:10 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 12:00Z, 7.1 hours before the alert went out and 168 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 12:00Z on 2018-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1253 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 12:00Z on 2018-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.1939Sfc1 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
1253 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
1257 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 6, 12:19 PM CDT, 1 hour 47 minutes earlier.

Area forecast discussion, Jul 6, 12:19 PM CDT, 1 hour 47 minutes before
Area Forecast Discussion...UPDATED
National Weather Service Norman OK
1219 PM CDT Fri Jul 6 2018

.AVIATION...
Isolated to scattered thunderstorms are possible across the region
throughout the afternoon into early evening. Confidence is too
low to mention in TAFs, however any storms that do develop will
have the potential for brief heavy rain and gusty, variable winds.
Otherwise, light northeast to east winds and VFR conditions will
prevail.

Day

&&

.PREV DISCUSSION... /issued 1028 AM CDT Fri Jul 6 2018/

UPDATE...
Isolated showers and a few storms will continue to be possible
this morning. Activity could become more scattered over parts of
the fa this afternoon. The models seem to favor western and
southern portions of the fa a little more than the rest of the
area for the scattered activity. This seems to be an area where
precipitable water is a little bit higher than in other parts of
the fa. Have increased PoPs to chance across southern and western
portions of the fa. All this being said, with the moist airmass
and heating, showers/storms are possible anywhere in the fa this
afternoon and early evening. Very heavy rain and cloud to ground
lightning are still expected to be the main concerns with many of
the storms but gusty winds could be possible with the stronger
storms.

Cloud cover is expected to increase as the day progresses and cu
develops. Made some adjustments to sky cover and dewpoints to show
current trends. With dewpoints, the drying trend was slowed down.
All updates out soon.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  94  73  91  68 /  20  20  10   0
Hobart OK         94  73  93  70 /  30  20  20  10
Wichita Falls TX  95  73  95  72 /  30  20  20  10
Gage OK           89  69  90  67 /  30  20  20   0
Ponca City OK     94  71  91  65 /  20  10  10   0
Durant OK         94  73  92  71 /  30  20  20  10

&&

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

25/10/14
Hazardous weather outlook, Jul 6, 11:46 AM CDT, 2 hours 20 minutes before
Hazardous Weather Outlook
National Weather Service Norman OK
1146 AM CDT Fri Jul 6 2018

OKZ004>048-050>052-TXZ083>090-071700-
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-
1146 AM CDT Fri Jul 6 2018

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

.DAY ONE...Through Tonight...

.Thunderstorms...
Isolated to scattered thunderstorms are possible. The greatest
coverage of storms are expected across western and southern
Oklahoma and adjacent parts of north Texas through the early
evening. The stronger storms will produce very heavy rainfall and
strong gusty winds.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

.Thunderstorms...
Thunderstorms are possible across portions of the area Saturday,
and also Monday through Wednesday. Severe storms are unlikely.

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

Mahale

In the hours before

Special weather statement, Jul 6, 12:08 PM CDT, 1 hour 58 minutes before
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Special weather statement, Jul 6, 1:11 PM CDT, 55 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
111 PM CDT FRI JUL 6 2018

OKZ036-061845-
Jackson OK-
111 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR central Jackson County Until 145
PM CDT....

AT 108 PM CDT, a strong thunderstorm was located near Olustee, moving
southwest at 15 MPH.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...
Brief heavy downpours could lead to reduce visibility...

LAT...LON 3465 9938 3451 9930 3441 9951 3441 9954
      3462 9967
TIME...MOT...LOC 1808Z 62DEG 11KT 3456 9944

MAXWELL
Special weather statement, Jul 6, 1:35 PM CDT, 31 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
135 PM CDT FRI JUL 6 2018

TXZ083-061900-
Hardeman TX-
135 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR west central Hardeman County
Until 200 PM CDT....

AT 131 PM CDT, a strong thunderstorm was located near Quanah, moving
west at 15 MPH.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...
Brief heavy downpours could lead to reduced visibility...

LAT...LON 3446 9999 3439 9971 3439 9970 3427 9970
      3424 10000
TIME...MOT...LOC 1831Z 93DEG 12KT 3434 9978

..speg.
Special weather statement, Jul 6, 1:40 PM CDT, 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
140 PM CDT FRI JUL 6 2018

OKZ014-061915-
Roger Mills OK-
140 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Roger Mills County
Until 215 PM CDT....

AT 138 PM CDT, a strong thunderstorm was located 4 miles southwest of
Cheyenne, moving west at 15 MPH.

HAZARDS INCLUDE...
Wind gusts over 50 MPH...
Hail up to one-half inch diameter...
Heavy rain can lead to reduced visibility...

LAT...LON 3567 9964 3549 9965 3546 9999 3573 9997
TIME...MOT...LOC 1838Z 93DEG 12KT 3559 9974

..speg.
Special weather statement, Jul 6, 1:55 PM CDT, 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
155 PM CDT FRI JUL 6 2018

OKZ004-005-061930-
Harper OK-Woods OK-
155 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR east central Harper and
northwestern Woods Counties Until 230 PM CDT....

AT 153 PM CDT, a strong thunderstorm was located 8 miles east of
Selman. This storm was nearly stationary.

HAZARDS INCLUDE...
Wind gusts over 50 MPH...
Hail up to one-half inch diameter...
Heavy rain can lead to reduced visibility...

LAT...LON 3686 9922 3679 9927 3680 9929 3676 9929
      3675 9930 3676 9950 3693 9941
TIME...MOT...LOC 1853Z 203DEG 2KT 3682 9934

..speg.
Special weather statement, Jul 6, 1:58 PM CDT, 8 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
158 PM CDT FRI JUL 6 2018

OKZ037-061930-
Tillman OK-
158 PM CDT FRI JUL 6 2018

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Tillman County Until
230 PM CDT....

AT 157 PM CDT, a strong thunderstorm was located near Frederick,
moving west at 15 MPH.

HAZARDS INCLUDE...
Wind gusts over 50 MPH...
Heavy rain can lead to reduced visibility...

LAT...LON 3442 9922 3445 9923 3446 9921 3447 9889
      3431 9884 3421 9913 3422 9913 3421 9915
      3421 9918 3431 9921 3435 9919 3437 9921
      3437 9922 3439 9921 3439 9923 3443 9924
TIME...MOT...LOC 1857Z 76DEG 15KT 3438 9896

..speg.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 12:08 PM CDTSpecial Weather StatementOUNKiowa37 min
Jul 6, 1:11 PM CDTSpecial Weather StatementOUNJackson34 min
Jul 6, 1:40 PM CDTSpecial Weather StatementOUNRoger Mills35 min
Jul 6, 1:55 PM CDTSpecial Weather StatementOUNHarper35 min
Jul 6, 1:58 PM CDTSpecial Weather StatementOUNTillman32 min
Jul 6, 2:15 PM CDTSpecial Weather StatementOUNHarper30 min
Jul 6, 2:20 PM CDTSpecial Weather StatementOUNBeckham25 min
Jul 6, 2:29 PM CDTSevere Thunderstorm WarningOUNJackson, Tillman31 min
Jul 6, 2:31 PM CDTSpecial Weather StatementOUNHarper29 min
Jul 6, 2:34 PM CDTSpecial Weather StatementOUNRoger Mills26 min
Jul 6, 2:49 PM CDTSpecial Weather StatementOUNBeckham26 min
Jul 6, 2:55 PM CDTSevere Thunderstorm WarningOUNRoger Mills35 min
Jul 6, 3:22 PM CDTSpecial Weather StatementOUNJackson23 min
Jul 6, 3:23 PM CDTSpecial Weather StatementOUNBeckham37 min
Jul 6, 3:54 PM CDTSpecial Weather StatementOUNDewey36 min
Jul 6, 4:03 PM CDTSpecial Weather StatementOUNHarmon27 min
Jul 6, 4:07 PM CDTSevere Thunderstorm WarningOUNDewey23 min
Jul 6, 4:14 PM CDTSpecial Weather StatementOUNRoger Mills31 min
Jul 6, 4:42 PM CDTAreal Flood AdvisoryOUNBeckham, Custer, Washita2 hr
Jul 6, 4:44 PM CDTSpecial Weather StatementOUNKay31 min
Jul 6, 4:52 PM CDTSpecial Weather StatementOUNAtoka23 min
Jul 6, 4:54 PM CDTSpecial Weather StatementOUNRoger Mills36 min
Jul 6, 5:07 PM CDTSpecial Weather StatementOUNNoble23 min
Jul 6, 5:14 PM CDTSpecial Weather StatementOUNAtoka31 min
Jul 6, 5:19 PM CDTSpecial Weather StatementOUNLincoln26 min
Jul 6, 5:42 PM CDTSpecial Weather StatementOUNCotton33 min
Jul 6, 5:46 PM CDTSpecial Weather StatementOUNLincoln29 min
Jul 6, 6:00 PM CDTSpecial Weather StatementOUNGreer30 min
Jul 6, 6:14 PM CDTSpecial Weather StatementOUNBryan31 min
Jul 6, 6:38 PM CDTSpecial Weather StatementOUNCotton37 min
Jul 6, 1:35 PM CDTSpecial Weather StatementOUNHardeman25 min
Jul 6, 6:47 PM CDTSpecial Weather StatementOUNCooke28 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018Every 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.