Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 660, NWS Norman, OK

July 5, 2017Cotton County, Tillman County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 5, 2017, 1:51 AM CDT for Cotton County, Tillman County, Oklahoma. It was in force for 39 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 5, 2017, 1:51 AM CDT (06:51 UTC)
Expired: Jul 5, 2017, 2:30 AM CDT
In force: 39 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cotton County, OK, Tillman County, OK

What was reported inside it

Time	Report	Where	Remark
Jul 5, 2:05 AM CDT	TSTM WND GST 73	3 W Grandfield, OK
Jul 5, 2:10 AM CDT	TSTM WND GST 66	3 W Grandfield, OK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 14 minutes after it went out.

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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.9 hours before the alert went out and 158 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: 172 J/kg
Mixed-layer CIN: -298 J/kg
Mixed-layer LCL: 1704 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

780 
WUUS54 KOUN 050651
SVROUN
OKC033-141-050730-
/O.NEW.KOUN.SV.W.0660.170705T0651Z-170705T0730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
151 AM CDT WED JUL 5 2017

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  West central Cotton County in southwestern Oklahoma...
  Southeastern Tillman County in southwestern Oklahoma...

* Until 230 AM CDT

* At 151 AM CDT, a severe thunderstorm was located 6 miles northeast
  of Hollister, moving southeast at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Grandfield, Hollister and Loveland. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3446 9893 3451 9883 3451 9877 3425 9848
      3420 9866 3418 9892
TIME...MOT...LOC 0651Z 323DEG 19KT 3443 9883 

HAIL...1.00IN
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 Jul 4, 11:56 PM CDT, 1 hour 55 minutes earlier.

Area forecast discussion, Jul 4, 11:56 PM CDT, 1 hour 55 minutes before

Area Forecast Discussion
National Weather Service Norman OK
1156 PM CDT Tue Jul 4 2017

.DISCUSSION...
The July 5-6, 2017 06 UTC TAF discussion follows:

&&

.AVIATION...
Scattered thunderstorms are currently developing across southwest
Oklahoma. These thunderstorms are expected to continue for the
next few hours as they slowly shift east-southeastward. Greatest
confidence of prevailing impacts will be from KHBR to KLAW with
lower probabilities at KCSM and KSPS (where TEMPOs were included).
Opted not to mention TSRA at KOKC/KOUN due to low probabilities.
Gusty, variable winds, small hail, and reduced visibility will be
possible within any thunderstorms.

Outside of thunderstorms, light east to southeast winds are
expected to continue through the TAF period.

Mahale

&&

.PREV DISCUSSION... /issued 637 PM CDT Tue Jul 4 2017/

DISCUSSION...
The July 5-6, 2017 00 UTC TAF discussion follows:

AVIATION...
Scattered thunderstorms are expected to develop across north
Texas and adjacent parts of southern Oklahoma late this
evening/overnight. Highest confidence of showers/storms is south
of a line from KCSM/KHBR to KLAW. Opted not to include TSRA at
KOKC/KOUN, where the probability is lower. Gusty, variable winds
and reduced visibility will be possible within any thunderstorms.

Otherwise, light and somewhat variable winds will continue;
however, the predominant directions will be from the northeast,
east or southeast through period.

Mahale

PREV DISCUSSION... /issued 304 PM CDT Tue Jul 4 2017/

DISCUSSION...
High-based showers are moving southeast through central Oklahoma.
Much of this is virga, but there is some light rain reaching the
ground at times. The main weather for tonight though is likely
beginning to develop in the northwest Texas panhandle and
northeast New Mexico. There has been a consistent signal today in
the HRRR and other models of storms developing here, becoming a
complex and moving southeast through the southwestern portion of
the forecast area. The unclear thing about these storms is how far
north storms will be in the area. Additional showers and storms
are progged to develop along an east-west line across southern
Oklahoma and north Texas, although different CAM runs have placed
this development at various latitudes. Regardless, the highest
POPs tonight will be in the southern part of the area, and
generally later this evening.

The upper trough from Illinois into southwest Missouri or
northeast Oklahoma finally wanders farther east tomorrow and
leaves the area in northwest/northerly upper-level flow between
this exiting trough and the building ridge in the west. We
maintain some low POPs for the next couple of days before the
ridge builds in a little stronger. In the longer term, one big
difference in the models is the degree of the warming trend toward
early next week. GFS low-level temperatures increase the heat
significantly more than the ECMWF early next week, mainly in the
west. Brought high temperatures a little higher than the model
blend given the building ridge and the fact that it is July.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  69  88  69  91 /  40  30  10   0
Hobart OK         70  90  70  92 /  60  30  10   0
Wichita Falls TX  73  90  71  93 /  60  40  20  10
Gage OK           66  90  68  94 /  20  20   0   0
Ponca City OK     65  87  68  91 /  20  10  10   0
Durant OK         73  88  70  90 /  60  60  20  10

&&

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

23/17/10

Hazardous weather outlook, Jul 4, 11:48 AM CDT, 14 hours 3 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1148 AM CDT Tue Jul 4 2017

OKZ004>048-050>052-TXZ083>090-051700-
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-
1148 AM CDT Tue Jul 4 2017

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

.DAY ONE...Today and Tonight...

.Thunderstorms...
There is a Marginal Risk of severe thunderstorms this evening and
overnight across southern Oklahoma and western north Texas,
generally south of a line from Erick to Lawton to Pauls Valley to
Coalgate. Wind gusts of 60 mph, hail up to the size of quarters,
and torrential rainfall will be the primary threats.

.Heavy rainfall...
Heavy rainfall may lead to areas of flooding this evening and
overnight across southern Oklahoma and western north Texas.

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

.Thunderstorms...
There will be at least a slight chance of thunderstorms each day
across parts of Oklahoma and north Texas.

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, Jul 5, 12:42 AM CDT, 1 hour 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1242 AM CDT WED JUL 5 2017

OKZ034>038-044-050615-
Kiowa OK-Tillman OK-Cotton OK-Greer OK-Comanche OK-Jackson OK-
1242 AM CDT WED JUL 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Kiowa...northern
Tillman...northwestern Cotton...southeastern Greer...western Comanche
and northeastern Jackson Counties Until 115 AM CDT...

AT 1241 AM CDT, strong thunderstorms were along a line extending from
5 miles southeast of Cache to 4 miles northwest of Blair, moving
southeast at 35 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 40 MPH...

Locations impacted include...
Western Lawton, Altus, Mangum, Cache, Snyder, Blair, Chattanooga,
Mountain Park, Indiahoma, Roosevelt, Manitou, Martha, Faxon,
Headrick, Friendship, Cooperton, Altus Air Force Base, Tom Steed
Reservoir, Warren and Humphreys.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3434 9842 3458 9943 3494 9952 3483 9860
TIME...MOT...LOC 0541Z 310DEG 32KT 3460 9854 3483 9940

MAHALE

Local storm report, Jul 5, 1:08 AM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
108 AM CDT WED JUL 05 2017

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

0106 AM     HAIL             SNYDER                  34.66N 98.95W
07/05/2017  E1.00 INCH       KIOWA              OK   BROADCAST MEDIA

            RELAYED BY KSWO

&&

CMS

Special weather statement, Jul 5, 1:12 AM CDT, 39 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
112 AM CDT WED JUL 5 2017

OKZ022-035-050645-
Kiowa OK-Washita OK-
112 AM CDT WED JUL 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Kiowa and
southwestern Washita Counties Until 145 AM CDT...

AT 110 AM CDT, a strong thunderstorm was located 4 miles east of
Retrop, 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...

Locations impacted include...
Sentinel and Retrop.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3512 9936 3519 9936 3525 9926 3511 9902
      3502 9930
TIME...MOT...LOC 0610Z 321DEG 8KT 3516 9928

MAHALE

Local storm report, Jul 5, 1:20 AM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
120 AM CDT WED JUL 05 2017

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

0116 AM     HAIL             8 E STERLING            34.75N 98.03W
07/05/2017  E0.75 INCH       GRADY              OK   BROADCAST MEDIA

            DIME TO NICKEL SIZE HAIL. RELAYED BY KSWO.

&&

CMS

Special weather statement, Jul 5, 1:25 AM CDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
125 AM CDT WED JUL 5 2017

OKZ034-036-050700-
Greer OK-Jackson OK-
125 AM CDT WED JUL 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Greer and central
Jackson Counties Until 200 AM CDT...

AT 125 AM CDT, a strong thunderstorm was located near Martha, moving
southeast at 20 MPH.

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

Locations impacted include...
Altus, Blair, Olustee, Martha, Friendship, Altus Air Force Base and
Hester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3475 9954 3490 9943 3464 9914 3457 9926
      3453 9941
TIME...MOT...LOC 0625Z 326DEG 15KT 3474 9940

MAHALE

Special weather statement, Jul 5, 1:31 AM CDT, 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
131 AM CDT WED JUL 5 2017

OKZ044-TXZ090-050700-
Cotton OK-Clay TX-
131 AM CDT WED JUL 5 2017

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Cotton and
northwestern Clay Counties Until 200 AM CDT...

AT 130 AM CDT, a strong thunderstorm was located 8 miles southeast of
Randlett, moving northeast at 10 MPH.

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

Locations impacted include...
Petrolia, Byers, Randlett, Taylor and Charlie.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3405 9842 3408 9842 3409 9845 3420 9851
      3427 9833 3402 9814 3397 9838
TIME...MOT...LOC 0630Z 245DEG 9KT 3410 9835

MAHALE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 11:35 PM CDT	Special Weather Statement	OUN	Comanche	25 min
Jul 5, 12:02 AM CDT	Special Weather Statement	OUN	Comanche	43 min
Jul 5, 12:08 AM CDT	Areal Flood Advisory	OUN	Comanche, Greer, Jackson, Kiowa	3 hr
Jul 5, 12:17 AM CDT	Special Weather Statement	OUN	Comanche	28 min
Jul 5, 12:28 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady, Stephens	47 min
Jul 5, 12:42 AM CDT	Special Weather Statement	OUN	Jackson	33 min
Jul 5, 12:50 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa, Tillman	40 min
Jul 5, 1:12 AM CDT	Special Weather Statement	OUN	Washita	33 min
Jul 5, 1:16 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	44 min
Jul 5, 1:19 AM CDT	Areal Flood Advisory	OUN	Comanche, Cotton, Jackson, Kiowa, Tillman	3 hr
Jul 5, 1:22 AM CDT	Severe Thunderstorm Warning	OUN	Grady	40 min
Jul 5, 1:25 AM CDT	Special Weather Statement	OUN	Jackson	35 min
Jul 5, 1:27 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	48 min
Jul 5, 1:31 AM CDT	Special Weather Statement	OUN	Cotton	29 min
Jul 5, 1:40 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	50 min
Jul 5, 1:49 AM CDT	Areal Flood Advisory	OUN	Jackson, Tillman	3 hr
Jul 5, 2:00 AM CDT	Special Weather Statement	OUN	Garvin	30 min
Jul 5, 2:07 AM CDT	Areal Flood Advisory	OUN	Comanche, Cotton, Grady, Jefferson, Stephens	3 hr
Jul 5, 2:11 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens	49 min
Jul 5, 2:15 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jackson, Tillman	45 min
Jul 5, 2:28 AM CDT	Special Weather Statement	OUN	Garvin, Stephens	32 min
Jul 5, 2:44 AM CDT	Special Weather Statement	OUN	Coal	31 min
Jul 5, 2:55 AM CDT	Severe Thunderstorm Warning	OUN	Jefferson	50 min
Jul 5, 2:56 AM CDT	Areal Flood Advisory	OUN	Coal, Johnston, Pontotoc	3 hr
Jul 5, 3:01 AM CDT	Areal Flood Advisory	OUN	Cotton, Tillman	3 hr
Jul 5, 3:13 AM CDT	Flash Flood Warning	OUN	Cotton, Jefferson, Stephens	6 hr
Jul 5, 3:21 AM CDT	Areal Flood Advisory	OUN	Custer, Washita	3 hr
Jul 5, 3:45 AM CDT	Special Weather Statement	OUN	Jefferson	45 min
Jul 5, 3:56 AM CDT	Special Weather Statement	OUN	Murray	34 min
Jul 5, 3:59 AM CDT	Special Weather Statement	OUN	Murray	31 min
Jul 5, 4:01 AM CDT	Areal Flood Advisory	OUN	Garvin, Murray, Pontotoc	3 hr
Jul 5, 4:07 AM CDT	Flash Flood Warning	OUN	Atoka, Coal	6 hr
Jul 5, 4:14 AM CDT	Special Weather Statement	OUN	Carter, Love	46 min
Jul 5, 4:27 AM CDT	Areal Flood Advisory	OUN	Carter, Coal, Johnston, Marshall, Murray, Pontotoc	3 hr
Jul 5, 5:05 AM CDT	Special Weather Statement	OUN	Atoka, Bryan, Coal, Johnston, Marshall	55 min
Jul 5, 5:33 AM CDT	Areal Flood Advisory	OUN	Atoka, Bryan, Johnston, Marshall	3 hr
Jul 5, 9:49 AM CDT	Areal Flood Warning	OUN	Atoka, Coal	6 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.