Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 247, NWS Norman, OK

May 10, 2017Caddo County, Comanche County, Kiowa County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 10, 2017, 6:17 PM CDT for Caddo County, Comanche County, Kiowa County, Oklahoma. It was in force for 43 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: May 10, 2017, 6:17 PM CDT (23:17 UTC)
Expired: May 10, 2017, 7:00 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

Counties Caddo County, OK, Comanche County, OK, Kiowa County, OK

The radar

The Altus AFB radar (KFDR), 84 km from the middle of the area, began a volume at 23:22 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

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 10, 2:43 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.3 hours before the alert went out and 110 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: 614 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 611 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

697 
WUUS54 KOUN 102317
SVROUN
OKC015-031-075-110000-
/O.NEW.KOUN.SV.W.0247.170510T2317Z-170511T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
617 PM CDT WED MAY 10 2017

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northwestern Comanche County in southwestern Oklahoma...
  Southwestern Caddo County in southwestern Oklahoma...
  East central Kiowa County in southwestern Oklahoma...

* Until 700 PM CDT

* At 616 PM CDT, a severe thunderstorm was located 8 miles northeast
  of Cooperton, moving northeast at 30 mph.

  HAZARD...Two inch hail and 60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees. 

* Locations impacted include...
  Carnegie, Apache, Fort Cobb, Boone, Fort Cobb Reservoir, Stecker
  and northwestern Wichita Mountains Wildlife Refuge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

For your protection move to an interior room on the lowest floor of a
building.

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 3511 9863 3510 9862 3511 9862 3520 9847
      3508 9836 3491 9830 3481 9880 3496 9887
TIME...MOT...LOC 2316Z 243DEG 27KT 3494 9875 

HAIL...2.00IN
WIND...60MPH
 
$$

MAHALE

2 follow-up statements

379 
WWUS54 KOUN 102334
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
634 PM CDT WED MAY 10 2017

OKC031-102344-
/O.CAN.KOUN.SV.W.0247.000000T0000Z-170511T0000Z/
Comanche OK-
634 PM CDT WED MAY 10 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN COMANCHE COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3509 9866 3511 9863 3510 9862 3511 9862
      3520 9847 3508 9836 3495 9831 3488 9861
      3490 9870 3498 9873
TIME...MOT...LOC 2334Z 235DEG 23KT 3496 9863 

$$

OKC015-075-110000-
/O.CON.KOUN.SV.W.0247.000000T0000Z-170511T0000Z/
Caddo OK-Kiowa OK-
634 PM CDT WED MAY 10 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHWESTERN CADDO AND EAST CENTRAL KIOWA COUNTIES...

At 634 PM CDT, a severe thunderstorm was located 10 miles south of
Carnegie, moving northeast at 25 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Carnegie, Fort Cobb, Fort Cobb Reservoir and Stecker. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 3509 9866 3511 9863 3510 9862 3511 9862
      3520 9847 3508 9836 3495 9831 3488 9861
      3490 9870 3498 9873
TIME...MOT...LOC 2334Z 235DEG 23KT 3496 9863 

HAIL...1.75IN
WIND...60MPH
 
$$

MAHALE

623 
WWUS54 KOUN 102347 RRA
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
647 PM CDT WED MAY 10 2017

OKC075-102357-
/O.CAN.KOUN.SV.W.0247.000000T0000Z-170511T0000Z/
Kiowa OK-
647 PM CDT WED MAY 10 2017

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL KIOWA COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3511 9862 3520 9847 3508 9836 3495 9831
      3488 9861 3488 9862
TIME...MOT...LOC 2347Z 243DEG 27KT 3500 9852 

$$

OKC015-110000-
/O.CON.KOUN.SV.W.0247.000000T0000Z-170511T0000Z/
Caddo OK-
647 PM CDT WED MAY 10 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHWESTERN CADDO COUNTY...

At 647 PM CDT, a severe thunderstorm was located 8 miles northwest of
Boone, moving northeast at 30 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

Locations impacted include...
Carnegie, Fort Cobb, Fort Cobb Reservoir and Stecker. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3511 9862 3520 9847 3508 9836 3495 9831
      3488 9861 3488 9862
TIME...MOT...LOC 2347Z 243DEG 27KT 3500 9852 

HAIL...1.50IN
WIND...60MPH
 
$$

MAHALE

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 10, 1:55 PM CDT, 4 hours 22 minutes earlier.

Area forecast discussion, May 10, 1:55 PM CDT, 4 hours 22 minutes before

Area Forecast Discussion
National Weather Service Norman OK
155 PM CDT Wed May 10 2017

.DISCUSSION...
Main focus is this afternoon and evening with potential for severe
thunderstorms. Latest observations show an outflow from morning
convection oriented east-northeast to west-southwest across the
area, roughly from just south of Ponca City to near Kingfisher to
just north of Hobart and Altus. North of the boundary, convection
has been persistent.

Latest water vapor band imagery shows deep closed low over central
New Mexico early this afternoon, drifting slowly east. 7.3
micrometer band clearly shows deep EML plume moving north-
northeast atop moist boundary layer. Moderate instability is
expected from mid-late afternoon south of aforementioned outflow
boundary, across extreme southwest Oklahoma and western north
Texas. Deep moist boundary layer and meridional flow may not be
favorable for significant eastward mixing of the dryline and
latest short term model guidance support this. Backed low level
flow that veers quickly above the surface as well relatively low
LCLs will support low-level mesocyclones and a tornado threat.
Significant CAPE in the hail growth zone and a tendency for
supercell storm mode will support a threat of large to very large
hail as well. Damaging winds are another convective threat.
Thunderstorms should move northeast potentially reaching the I-35
corridor this evening. This will be the main area of convection
today. Further north convection and a few marginally severe storms
will be possible, but the air mass north of the boundary is
comparatively more stable.

We have shifted precipitation chances tomorrow further west based
on trends. There is some uncertainty on how convection will evolve
this evening and overnight, and this will have implications on
tomorrow's forecast. Admittedly the majority of our attention has
been on today and tonight's potential. But, there seems to be
enough signal in model trends to bring thunderstorm chances
further west, with afternoon convection (including the possibility
of severe thunderstorms) certainly possible near I-35 and the
metro.

No significant chances were needed to latter portions of the
forecast. Mean ridging should preclude convection through at least
Sunday afternoon, but some isolated storms that develop in the
panhandles (if they develop) may approach far western Oklahoma by
evening. An ejecting shortwave trough across the central Rockies
into the central and northern Plains early next week will lead to
daily convective chances, and severe thunderstorms may be
possible. We will refine timing, coverage and threats as smaller
scale details become more clear during the next few days.

BRB

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  76  65  80  57 /  50  50  60  40
Hobart OK         77  60  80  55 /  80  60  20  20
Wichita Falls TX  81  64  87  59 /  30  60  20  10
Gage OK           73  55  71  48 /  70  50  50  10
Ponca City OK     76  62  77  55 / 100  50  70  50
Durant OK         76  67  80  59 /  20  20  80  50

&&

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

25/12

Hazardous weather outlook, May 10, 3:52 PM CDT, 2 hours 25 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
352 PM CDT Wed May 10 2017

OKZ004>048-050>052-TXZ083>090-112100-
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-
352 PM CDT Wed May 10 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 an enhanced risk of severe thunderstorms across portions
of west central and southwestern Oklahoma, and western north
Texas. There is a slight risk of severe thunderstorms across
portions of northern, central and south central Oklahoma.

.Location...
The enhanced risk is south of a line from Cheyenne to
Weatherford, and west of a line from Weatherford to Lawton,
Oklahoma to Electra and Knox City, Texas. The slight risk
surrounds the enhanced risk and is west of a line from Stillwater
and Shawnee, to Pauls Valley and Ardmore, Oklahoma.

.Timing...
Severe storms will be possible through midnight.

.Impacts...
Large hail up to the size of tennis balls and damaging wind gusts
up to 70 mph will be possible. A few tornadoes will also be
possible, especially across portions of southwestern Oklahoma and
western north Texas.

.Discussion...
Showers and thunderstorms will continue to develop and move across
the area through this evening. The greatest potential for severe
weather will be across portions of southwest Oklahoma and western
north Texas near a dryline and an outflow boundary that extends
from southwest into central Oklahoma.

Large hail and strong winds will be the main concerns across the
risk areas. A few tornadoes will also be possible, especially near
the outflow boundary in southwest Oklahoma and western north
Texas.

The potential for severe weather is expected to decrease late this
evening and overnight although thunderstorms will remain possible
into Thursday morning.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT....
Storm spotter groups and emergency management personnel across
the risk areas should prepare for severe weather operations most
of the day.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

.Thunderstorms...
There is a slight risk of severe thunderstorms Thursday afternoon
and evening across portions of southeastern Oklahoma. Large hail,
damaging winds, and perhaps a tornado or two will be possible.

Thunderstorm chances will end late Thursday night across eastern
and southeastern Oklahoma, and return late this weekend through
early next week.

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

In the hours before

Local storm report, May 10, 5:29 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
529 PM CDT WED MAY 10 2017

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

0528 PM     HAIL             ALTUS                   34.64N 99.33W
05/10/2017  E1.75 INCH       JACKSON            OK   EMERGENCY MNGR

&&

SC

Local storm report, May 10, 5:33 PM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
533 PM CDT WED MAY 10 2017

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

0533 PM     HAIL             1 N ALTUS               34.66N 99.33W
05/10/2017  E1.00 INCH       JACKSON            OK   PUBLIC

&&

SC

Local storm report, May 10, 5:42 PM CDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
542 PM CDT WED MAY 10 2017

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

0535 PM     TSTM WND GST     3 E ALTUS               34.64N 99.28W
05/10/2017  M76 MPH          JACKSON            OK   ASOS

&&

SC

Local storm report, May 10, 5:44 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
544 PM CDT WED MAY 10 2017

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

0540 PM     HAIL             2 E WARREN              34.78N 99.18W
05/10/2017  E1.50 INCH       JACKSON            OK   TRAINED SPOTTER

&&

SC

Special weather statement, May 10, 5:49 PM CDT, 28 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
549 PM CDT WED MAY 10 2017

TXZ083-084-102315-
Foard TX-Hardeman TX-
549 PM CDT WED MAY 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Foard and
southwestern Hardeman Counties Until 615 PM CDT...

AT 547 PM CDT, a strong thunderstorm was located 8 miles southeast of
Swearingen, moving north at 30 MPH.

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 3423 10005 3424 10003 3424 10001 3423 10000
      3442 10000 3428 9966 3398 9995 3402 10005
TIME...MOT...LOC 2247Z 200DEG 27KT 3409 10001

BRB

Special weather statement, May 10, 6:00 PM CDT, 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
600 PM CDT WED MAY 10 2017

OKZ033-036-TXZ083-102330-
Harmon OK-Jackson OK-Hardeman TX-
600 PM CDT WED MAY 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Harmon...
southwestern Jackson and central Hardeman Counties Until 630 PM
CDT...

AT 558 PM CDT, strong thunderstorms were along a line extending from
7 miles northeast of Eldorado to 6 miles north of Quanah, moving
northeast at 30 MPH.

HAZARDS INCLUDE... Hail up to dime size...
Wind gusts to 50 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 3438 9986 3473 9949 3472 9948 3458 9929
      3429 9973
TIME...MOT...LOC 2258Z 223DEG 25KT 3454 9955 3439 9975

BRB

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 6:26 AM CDT	Special Weather Statement	OUN	Beckham, Roger Mills	34 min
May 10, 7:01 AM CDT	Special Weather Statement	OUN	Beckham, Roger Mills	29 min
May 10, 7:30 AM CDT	Special Weather Statement	OUN	Custer, Dewey, Woodward	45 min
May 10, 8:08 AM CDT	Special Weather Statement	OUN	Custer, Dewey, Major, Woods, Woodward	52 min
May 10, 8:40 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	50 min
May 10, 8:48 AM CDT	Special Weather Statement	OUN	Blaine, Major	27 min
May 10, 9:16 AM CDT	Special Weather Statement	OUN	Garfield, Grant, Kingfisher	29 min
May 10, 9:28 AM CDT	Special Weather Statement	OUN	Alfalfa	32 min
May 10, 10:03 AM CDT	Special Weather Statement	OUN	Garfield, Grant	27 min
May 10, 10:04 AM CDT	Special Weather Statement	OUN	Roger Mills	26 min
May 10, 10:36 AM CDT	Special Weather Statement	OUN	Dewey	24 min
May 10, 11:13 AM CDT	Special Weather Statement	OUN	Woodward	32 min
May 10, 11:53 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Woods	37 min
May 10, 1:29 PM CDT	Special Weather Statement	OUN	Marshall	31 min
May 10, 1:57 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	48 min
May 10, 2:09 PM CDT	Special Weather Statement	OUN	Johnston	36 min
May 10, 2:24 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	27 min
May 10, 2:34 PM CDT	Special Weather Statement	OUN	Coal	26 min
May 10, 2:45 PM CDT	Special Weather Statement	OUN	Alfalfa	30 min
May 10, 2:54 PM CDT	Special Weather Statement	OUN	Oklahoma	36 min
May 10, 2:58 PM CDT	Special Weather Statement	OUN	Garfield	32 min
May 10, 3:08 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay	37 min
May 10, 3:24 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	37 min
May 10, 3:37 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	23 min
May 10, 3:44 PM CDT	Special Weather Statement	OUN	Hughes	16 min
May 10, 3:54 PM CDT	Special Weather Statement	OUN	Kay	36 min
May 10, 4:01 PM CDT	Tornado Warning	OUN	Jackson	29 min
May 10, 4:17 PM CDT	Special Weather Statement	OUN	Kay	28 min
May 10, 4:28 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	47 min
May 10, 4:59 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	46 min
May 10, 5:14 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	46 min
May 10, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa	48 min
May 10, 5:44 PM CDT	Areal Flood Advisory	OUN	Jackson	2 hr
May 10, 6:00 PM CDT	Special Weather Statement	OUN	Jackson	30 min
May 10, 6:15 PM CDT	Severe Thunderstorm Warning	OUN	Harmon	45 min
May 10, 6:20 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	55 min
May 10, 6:24 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon	39 min
May 10, 6:30 PM CDT	Special Weather Statement	OUN	Jackson	30 min
May 10, 6:38 PM CDT	Areal Flood Advisory	OUN	Jackson	2 hr
May 10, 6:41 PM CDT	Areal Flood Advisory	OUN	Jackson, Kiowa	3 hr
May 10, 6:54 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	51 min
May 10, 6:56 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	49 min
May 10, 6:57 PM CDT	Special Weather Statement	OUN	Greer	33 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.