Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 120, NWS Norman, OK

May 13, 2018Roger Mills County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 13, 2018, 8:17 PM CDT for Roger Mills County, Oklahoma. It was in force for 58 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: May 13, 2018, 8:17 PM CDT (01:17 UTC)
Expired: May 13, 2018, 9:15 PM CDT
In force: 58 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.75 in
Wind: 70.0 mph

County Roger Mills County, OK

The radar

The Altus AFB radar (KFDR), 161 km from the middle of the area, began a volume at 01:17 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
May 13, 3:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 1.3 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3885 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 72 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 May 13, 6:15 PM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, May 13, 6:15 PM CDT, 2 hours 2 minutes before

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Hazardous weather outlook, May 13, 3:02 PM CDT, 5 hours 15 minutes before

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In the hours before

Special weather statement, May 13, 4:21 PM CDT, 3 hours 56 minutes before

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Special weather statement, May 13, 6:42 PM CDT, 1 hour 35 minutes before

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Special weather statement, May 13, 7:09 PM CDT, 1 hour 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
709 PM CDT SUN MAY 13 2018

OKZ004-140030-
Harper OK-
709 PM CDT SUN MAY 13 2018

...SIGNIFICANT WEATHER ADVISORY FOR western Harper County Until 730
PM CDT...

AT 707 PM CDT, a strong thunderstorm was located 5 miles southwest of
Laverne, moving northeast at 35 MPH.

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

Locations impacted include...
Laverne, May and Rosston.

Damaging winds may become more likely with this storm.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3697 9997 3681 9977 3659 9968 3660 10000
      3697 10000
TIME...MOT...LOC 0007Z 242DEG 29KT 3663 9995

BRB

Special weather statement, May 13, 8:02 PM CDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
802 PM CDT SUN MAY 13 2018

OKZ004-005-140130-
Harper OK-Woods OK-
802 PM CDT SUN MAY 13 2018

...SIGNIFICANT WEATHER ADVISORY FOR Harper and northwestern Woods
Counties Until 830 PM CDT...

AT 759 PM CDT, a strong thunderstorm was located 6 miles north of
Selman, moving northeast at 30 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...
Frequent cloud to ground lightning...

Locations impacted include...
Laverne, Buffalo and Selman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3700 9921 3659 9946 3659 9964 3676 10000
      3700 9963
TIME...MOT...LOC 0059Z 221DEG 24KT 3689 9952

03

Special weather statement, May 13, 8:04 PM CDT, 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
804 PM CDT SUN MAY 13 2018

OKZ014-140145-
Roger Mills OK-
804 PM CDT SUN MAY 13 2018

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Roger Mills County
Until 845 PM CDT...

AT 802 PM CDT, a strong thunderstorm was located near Allison, moving
east at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts over 50 MPH...
Frequent cloud to ground lightning...

Locations impacted include...
Reydon and Dempsey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Storm intensity is increasing and severe weather may develop rapidly.
Stay alert and listen for warnings.

&&

LAT...LON 3572 10000 3581 9979 3548 9969 3546 10000
TIME...MOT...LOC 0102Z 258DEG 16KT 3556 10010

03

Special weather statement, May 13, 8:14 PM CDT, 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
814 PM CDT SUN MAY 13 2018

OKZ009-140215-
Ellis OK-
814 PM CDT SUN MAY 13 2018

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Ellis County Until
915 PM CDT...

AT 812 PM CDT, a strong thunderstorm was located near Higgins, moving
east at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...
Frequent cloud to ground lightning...

Locations impacted include...
Shattuck, Arnett, Gage and Catesby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3647 10000 3649 9999 3656 9967 3602 9978
      3603 10000
TIME...MOT...LOC 0112Z 248DEG 16KT 3615 10007

03

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 7:09 PM CDT	Special Weather Statement	OUN	Harper	21 min
May 13, 7:24 PM CDT	Severe Thunderstorm Warning	OUN	Harper	36 min
May 13, 8:02 PM CDT	Special Weather Statement	OUN	Harper	28 min
May 13, 8:04 PM CDT	Special Weather Statement	OUN	Roger Mills	41 min
May 13, 8:14 PM CDT	Special Weather Statement	OUN	Ellis	61 min
May 13, 8:42 PM CDT	Special Weather Statement	OUN	Woods	48 min
May 13, 8:46 PM CDT	Special Weather Statement	OUN	Harper	59 min
May 13, 8:57 PM CDT	Severe Thunderstorm Warning	OUN	Woods	44 min
May 13, 9:04 PM CDT	Special Weather Statement	OUN	Ellis	41 min
May 13, 9:09 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	51 min
May 13, 9:13 PM CDT	Special Weather Statement	OUN	Roger Mills	47 min
May 13, 9:21 PM CDT	Special Weather Statement	OUN	Harmon	54 min
May 13, 9:31 PM CDT	Special Weather Statement	OUN	Dewey	29 min
May 13, 9:49 PM CDT	Special Weather Statement	OUN	Woods	56 min
May 13, 10:26 PM CDT	Special Weather Statement	OUN	Greer	34 min
May 13, 10:28 PM CDT	Special Weather Statement	OUN	Harmon	47 min
May 13, 10:38 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	37 min
May 13, 10:55 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	50 min
May 13, 11:03 PM CDT	Special Weather Statement	OUN	Kiowa	57 min
May 13, 11:09 PM CDT	Special Weather Statement	OUN	Washita	21 min
May 13, 11:21 PM CDT	Special Weather Statement	OUN	Jackson	24 min
May 13, 11:28 PM CDT	Special Weather Statement	OUN	Beckham	47 min
May 13, 11:35 PM CDT	Special Weather Statement	OUN	Washita	55 min
May 13, 11:47 PM CDT	Special Weather Statement	OUN	Jackson, Kiowa	28 min
May 14, 12:05 AM CDT	High Wind Warning	OUN	Blaine, Caddo, Custer, Washita	115 min
May 14, 12:06 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	39 min
May 14, 12:33 AM CDT	Special Weather Statement	OUN	Greer	27 min
May 14, 12:45 AM CDT	Special Weather Statement	OUN	Kiowa	30 min
May 14, 12:59 AM CDT	Special Weather Statement	OUN	Greer	31 min
May 14, 1:12 AM CDT	Special Weather Statement	OUN	Comanche	33 min
May 14, 1:32 AM CDT	Special Weather Statement	OUN	Kiowa	28 min
May 14, 5:17 PM CDT	Special Weather Statement	OUN	Roger Mills	28 min
May 14, 5:29 PM CDT	Special Weather Statement	OUN	Beckham	31 min
May 14, 5:30 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	45 min
May 14, 5:42 PM CDT	Special Weather Statement	OUN	Harmon	33 min
May 14, 5:57 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon	48 min
May 14, 5:58 PM CDT	Special Weather Statement	OUN	Beckham	32 min
May 14, 6:00 PM CDT	Special Weather Statement	OUN	Ellis	30 min
May 14, 6:05 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Roger Mills	55 min
May 14, 6:09 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Woodward	51 min
May 14, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	46 min
May 14, 6:42 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woodward	48 min
May 14, 6:46 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Jackson	44 min
May 14, 6:49 PM CDT	Special Weather Statement	OUN	Custer	26 min
May 14, 6:56 PM CDT	Severe Thunderstorm Warning	OUN	Kay	64 min
May 13, 10:33 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	42 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.