Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 283, NWS Norman, OK

May 11, 2017Blaine County, Dewey County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 11, 2017, 3:39 PM CDT for Blaine County, Dewey 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 counties it named.

The facts

Issued: May 11, 2017, 3:39 PM CDT (20:39 UTC)
Expired: May 11, 2017, 4:30 PM CDT
In force: 51 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Blaine County, OK, Dewey County, OK

The radar

The Vance AFB radar (KVNX), 104 km from the middle of the area, began a volume at 20:39 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 11, 12:56 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 8.7 hours before the alert went out and 143 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: 592 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1262 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.8

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 11, 2:23 PM CDT, 1 hour 16 minutes earlier.

Area forecast discussion, May 11, 2:23 PM CDT, 1 hour 16 minutes before

Area Forecast Discussion
National Weather Service Norman OK
223 PM CDT Thu May 11 2017

.DISCUSSION...
Scattered to numerous thunderstorms have developed in an
increasingly unstable uncapped air mass across much of northern
Oklahoma. Steepening mid-level lapse rates as closed mid-upper low
approach and robust updrafts in a moderately unstable environment
will support large hail with these storms. A secondary threat will
be damaging winds. Weak low level shear will limit the tornado
threat, however a brief tornado cannot be ruled out where shear is
locally enhanced near boundaries.

Greatest thunderstorm coverage will generally be across northern
and eastern portions of the area through the evening and into
early tonight. Most of the showers and storms will shift east by
morning as mid-upper low moves east. Low clouds and stratus will
diminish during the morning. A warming trend is expected this
weekend as mean ridging builds in.

Next week looks more active as lead wave ejects northeast into the
plains on Tuesday bringing a threat of convection, including the
potential for severe weather. Medium range guidance diverges some
into mid-week on timing of lead wave and deep closed low in the
west. Periodic chances for thunderstorms, including severe
weather, can be expected across the area next week.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  78  57  72  52 /  60  40  10   0
Hobart OK         78  55  75  50 /  20  10   0   0
Wichita Falls TX  86  58  78  53 /  20  10   0   0
Gage OK           68  48  71  47 /  60  10   0   0
Ponca City OK     75  56  72  50 /  80  60  10   0
Durant OK         80  60  74  55 /  50  30  10   0

&&

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

25/12

Hazardous weather outlook, May 11, 2:05 PM CDT, 1 hour 34 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
205 PM CDT Thu May 11 2017

OKZ004>048-050>052-TXZ083>090-121915-
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-
205 PM CDT Thu May 11 2017

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

.DAY ONE...Rest of This Afternoon and Tonight...

.Thunderstorms...
There is a slight risk of severe thunderstorms across portions of
Oklahoma into this evening.

Location...
The slight risk area is east of a line from Alva and Clinton to
Chickasha and Ada to Durant Oklahoma. A marginal risk is west of
the slight risk and east of a line from Buffalo to Elk City to
near Pauls Valley and Ardmore Oklahoma.

Timing...
Severe storms will be possible through 9 PM.

Impacts...
Large hail up to the size of tennis balls and damaging wind gusts
up to 70 mph will be possible. There is a low potential for a
tornado or two across portions of north central and central
Oklahoma.

Discussion...
Scattered showers and thunderstorms will continue to develop this
afternoon across portions of Oklahoma. Some of the storms could
become strong to severe across the risk areas with large hail and
strong winds the main concerns. However, a tornado or two can not
be ruled out in parts of north central and central Oklahoma.

The severe potential is expected to diminish this evening.

SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... Storm
spotter groups and emergency management personnel across the risk
areas should prepare for severe weather operations this afternoon
and evening.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday...

.Thunderstorms...
Thunderstorm chances will return Monday and continue through at
least Wednesday. Strong to severe storms will be possible.

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, May 11, 3:01 PM CDT, 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
301 PM CDT THU MAY 11 2017

OKZ011-112015-
Major OK-
301 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR south central Major County Until
315 PM CDT...

AT 300 PM CDT, a strong thunderstorm was located near Fairview. This
storm was nearly stationary.

HAZARDS INCLUDE...
Hail up to the size of nickels...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3617 9864 3632 9866 3643 9847 3630 9833
      3619 9833
TIME...MOT...LOC 2000Z 244DEG 2KT 3627 9853

BRB

Local storm report, May 11, 3:04 PM CDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
304 PM CDT THU MAY 11 2017

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

0256 PM     HAIL             COYLE                   35.95N 97.24W
05/11/2017  E4.25 INCH       LOGAN              OK   FIRE DEPT/RESCUE

0256 PM     TSTM WND GST     COYLE                   35.95N 97.24W
05/11/2017  E70 MPH          LOGAN              OK   FIRE DEPT/RESCUE

0256 PM     HAIL             LANGSTON                35.95N 97.26W
05/11/2017  E1.75 INCH       LOGAN              OK   LAW ENFORCEMENT

            UNIVERSITY POLICE

&&

DW

Special weather statement, May 11, 3:13 PM CDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
313 PM CDT THU MAY 11 2017

OKZ005-112045-
Woods OK-
313 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR Woods County Until 345 PM CDT...

AT 310 PM CDT, strong thunderstorms were along a line extending from
11 miles south of Aetna to 7 miles southeast of Freedom, moving east
at 5 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 40 MPH...
Minor flooding in areas of poor drainage...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3700 9866 3666 9886 3662 9898 3663 9898
      3669 9905 3671 9906 3672 9908 3674 9910
      3689 9914 3700 9914
TIME...MOT...LOC 2010Z 282DEG 4KT 3693 9889 3671 9900

BRB

Special weather statement, May 11, 3:16 PM CDT, 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
316 PM CDT THU MAY 11 2017

OKZ006-112045-
Alfalfa OK-
316 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Alfalfa County Until
345 PM CDT...

AT 314 PM CDT, a strong thunderstorm was located near Burlington,
moving east at 5 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 40 MPH...
Minor flooding in areas of poor drainage...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3699 9820 3681 9826 3686 9850 3700 9852
TIME...MOT...LOC 2014Z 282DEG 4KT 3693 9839

BRB

Local storm report, May 11, 3:23 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
323 PM CDT THU MAY 11 2017

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

0306 PM     HAIL             MERIDIAN                35.84N 97.25W
05/11/2017  E2.50 INCH       LOGAN              OK   FIRE DEPT/RESCUE

0313 PM     TSTM WND GST     7 W STILLWATER          36.12N 97.18W
05/11/2017  M78 MPH          PAYNE              OK   AMATEUR RADIO

            HWY 51 AND CARSTEEN CREEK RD.

&&

DW

Special weather statement, May 11, 3:28 PM CDT, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
328 PM CDT THU MAY 11 2017

OKZ015-112100-
Dewey OK-
328 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR eastern Dewey County Until 400 PM
CDT...

AT 327 PM CDT, a strong thunderstorm was located 5 miles east of
Seiling, moving southeast at 10 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 40 MPH...
Minor flooding in areas of poor drainage...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3598 9864 3585 9877 3595 9904 3616 9892
      3616 9864
TIME...MOT...LOC 2027Z 296DEG 10KT 3614 9883

BRB

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 7:07 PM CDT	Special Weather Statement	OUN	Kiowa	38 min
May 10, 7:20 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Tillman	40 min
May 10, 7:23 PM CDT	Areal Flood Advisory	OUN	Caddo	3 hr
May 10, 7:36 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	54 min
May 10, 7:42 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	48 min
May 10, 7:45 PM CDT	Areal Flood Advisory	OUN	Tillman	60 min
May 10, 7:55 PM CDT	Tornado Warning	OUN	Tillman	35 min
May 10, 8:03 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche	42 min
May 10, 8:17 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady, Oklahoma	43 min
May 10, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	62 min
May 10, 8:31 PM CDT	Tornado Warning	OUN	Cotton, Tillman	29 min
May 10, 8:37 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	38 min
May 10, 8:52 PM CDT	Areal Flood Advisory	OUN	Caddo, Grady	3 hr
May 10, 8:55 PM CDT	Areal Flood Advisory	OUN	Comanche, Cotton, Stephens	3 hr
May 10, 9:23 PM CDT	Special Weather Statement	OUN	Oklahoma	37 min
May 10, 9:29 PM CDT	Special Weather Statement	OUN	Stephens	31 min
May 10, 9:36 PM CDT	Special Weather Statement	OUN	Payne	24 min
May 10, 9:39 PM CDT	Special Weather Statement	OUN	Cleveland	36 min
May 10, 9:42 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	18 min
May 10, 9:53 PM CDT	Special Weather Statement	OUN	McClain	37 min
May 10, 9:56 PM CDT	Special Weather Statement	OUN	Stephens	34 min
May 10, 9:57 PM CDT	Special Weather Statement	OUN	Caddo	33 min
May 10, 10:20 PM CDT	Special Weather Statement	OUN	Cleveland, Garvin, Pottawatomie	40 min
May 10, 10:36 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Stephens	39 min
May 10, 10:38 PM CDT	Special Weather Statement	OUN	Grady	37 min
May 10, 10:41 PM CDT	Special Weather Statement	OUN	Caddo	34 min
May 10, 10:45 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Hughes, Pottawatomie, Seminole	31 min
May 10, 10:49 PM CDT	Special Weather Statement	OUN	Caddo	26 min
May 10, 11:12 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc, Pottawatomie	48 min
May 11, 3:14 AM CDT	Special Weather Statement	OUN	Grady	31 min
May 11, 3:55 AM CDT	Special Weather Statement	OUN	Stephens	35 min
May 11, 5:06 AM CDT	Special Weather Statement	OUN	McClain	24 min
May 11, 10:44 AM CDT	Special Weather Statement	OUN	Harper	31 min
May 11, 10:50 AM CDT	Severe Thunderstorm Warning	OUN	Harper	40 min
May 11, 12:03 PM CDT	Special Weather Statement	OUN	Harper	27 min
May 11, 12:28 PM CDT	Special Weather Statement	OUN	Grant	32 min
May 11, 12:30 PM CDT	Special Weather Statement	OUN	Harper	30 min
May 11, 12:57 PM CDT	Special Weather Statement	OUN	Woodward	33 min
May 11, 1:04 PM CDT	Special Weather Statement	OUN	Blaine	26 min
May 11, 1:17 PM CDT	Special Weather Statement	OUN	Kingfisher	28 min
May 11, 1:24 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	51 min
May 11, 1:27 PM CDT	Special Weather Statement	OUN	Grant	33 min
May 11, 1:29 PM CDT	Special Weather Statement	OUN	Woodward	31 min
May 11, 1:38 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	52 min
May 11, 1:40 PM CDT	Special Weather Statement	OUN	Payne	35 min
May 11, 1:44 PM CDT	Special Weather Statement	OUN	Garfield	31 min
May 11, 1:48 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	42 min
May 11, 1:59 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	31 min
May 11, 2:00 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	45 min
May 11, 2:03 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan	42 min
May 11, 2:06 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	39 min
May 11, 2:07 PM CDT	Areal Flood Advisory	OUN	Kingfisher	113 min
May 11, 2:19 PM CDT	Severe Thunderstorm Warning	OUN	Noble	41 min
May 11, 2:20 PM CDT	Areal Flood Advisory	OUN	Grant	3 hr
May 11, 2:24 PM CDT	Special Weather Statement	OUN	Custer	36 min
May 11, 2:26 PM CDT	Areal Flood Advisory	OUN	Logan	2 hr
May 11, 2:26 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	49 min
May 11, 2:30 PM CDT	Severe Thunderstorm Warning	OUN	Woods, Woodward	45 min
May 11, 2:38 PM CDT	Special Weather Statement	OUN	Alfalfa	37 min
May 11, 2:38 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Logan, Noble, Payne	52 min
May 11, 2:40 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	50 min
May 11, 2:44 PM CDT	Severe Thunderstorm Warning	OUN	Noble	46 min
May 11, 2:50 PM CDT	Tornado Warning	OUN	Logan, Noble, Payne	25 min
May 11, 2:57 PM CDT	Severe Thunderstorm Warning	OUN	Kay	48 min
May 11, 3:01 PM CDT	Special Weather Statement	OUN	Major	14 min
May 11, 3:01 PM CDT	Severe Thunderstorm Warning	OUN	Custer	44 min
May 11, 3:08 PM CDT	Areal Flood Advisory	OUN	Logan, Noble, Payne	2 hr
May 11, 3:09 PM CDT	Tornado Warning	OUN	Lincoln, Payne	24 min
May 11, 3:11 PM CDT	Tornado Warning	OUN	Noble, Payne	20 min
May 11, 3:13 PM CDT	Special Weather Statement	OUN	Woods	32 min
May 11, 3:16 PM CDT	Special Weather Statement	OUN	Alfalfa	29 min
May 11, 3:16 PM CDT	Severe Thunderstorm Warning	OUN	Major	44 min
May 11, 3:26 PM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	19 min
May 11, 3:28 PM CDT	Special Weather Statement	OUN	Dewey	32 min
May 11, 3:28 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	47 min
May 11, 3:31 PM CDT	Flash Flood Warning	OUN	Noble	5 hr
May 11, 3:32 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	43 min
May 11, 3:43 PM CDT	Areal Flood Advisory	OUN	Kay, Noble	2 hr
May 11, 3:43 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	47 min
May 11, 3:53 PM CDT	Severe Thunderstorm Warning	OUN	Custer	37 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2017 Every severe thunderstorm warning in 2017

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.