Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 671, NWS Norman, OK

July 7, 2017Blaine County, Dewey County, Major County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 7, 2017, 9:08 PM CDT for Blaine County, Dewey County, Major County, Oklahoma. It was in force for 37 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: Jul 7, 2017, 9:08 PM CDT (02:08 UTC)
Expired: Jul 7, 2017, 9:45 PM CDT
In force: 37 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 2.0 in
Wind: 70.0 mph

Counties Blaine County, OK, Dewey County, OK, Major County, OK

The radar

The Vance AFB radar (KVNX), 79 km from the middle of the area, began a volume at 02:12 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 nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.1 hours before the alert went out and 140 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: 299 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 2496 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: -8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

232 
WUUS54 KOUN 080208
SVROUN
OKC011-043-093-080245-
/O.NEW.KOUN.SV.W.0671.170708T0208Z-170708T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
908 PM CDT FRI JUL 7 2017

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northwestern Blaine County in northwestern Oklahoma...
  East central Dewey County in northwestern Oklahoma...
  South central Major County in northwestern Oklahoma...

* Until 945 PM CDT

* At 908 PM CDT, a severe thunderstorm was located near Longdale, and
  is nearly stationary.

  HAZARD...Two inch hail and 70 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings. 

* Locations impacted include...
  Fairview, Canton, Longdale, Canton Lake and Southard. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3610 9838 3598 9855 3608 9873 3625 9849
TIME...MOT...LOC 0208Z 143DEG 3KT 3611 9852 

HAIL...2.00IN
WIND...70MPH
 
$$

WR

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 7, 7:06 PM CDT, 2 hours 2 minutes earlier.

Area forecast discussion, Jul 7, 7:06 PM CDT, 2 hours 2 minutes before

Area Forecast Discussion
National Weather Service Norman OK
706 PM CDT Fri Jul 7 2017

.DISCUSSION...

&&

.AVIATION...
Scattered thunderstorms are expected this evening in northern
border areas of Oklahoma, then overnight in a broader reach of
northern Oklahoma. Scattered thunderstorms will occur on Saturday
over a broader area of most of Oklahoma. Winds will remain less
than 12 knots outside of scattered thunderstorms and mostly VFR
conditions will prevail.

&&

.PREV DISCUSSION... /issued 231 PM CDT Fri Jul 7 2017/

DISCUSSION...
A weak cold front will approach/enter northern Oklahoma late this
afternoon and evening.  A few strong to perhaps severe storms
may develop along the front, especially over north central Oklahoma.
Mid and upper level flow across the area is rather weak but
slightly stronger over northern Oklahoma.  Rather high downdraft
values per SPC site, so expect main hazard with afternoon/evening
storms will be strong wind gusts. If storms form, they will likely
weaken as the move south through the mid evening. More numerous
storms are expected to develop over the high plains of eastern
Colorado and New Mexico. This activity may eventually reach
northwest Oklahoma, mainly after midnight.

Clouds from convection overnight and lingering showers should keep
temperatures cooler on Saturday, especially the northern half of
Oklahoma. Scattered showers and storms may form again Saturday
afternoon with influences from late Friday/early Saturday
convection. Better rain chances Saturday afternoon and evening
will be across the eastern half of Oklahoma where cooler 85-7h
temperatures will be along with better near surface moisture.

A few storms will remain possible Sunday, mainly across the
eastern half/third of Oklahoma.

A mid and upper level ridge will begin to build across the Plains
by early next week. This will bring a period of hot days/warm
nights with little or no chance of rain.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  73  91  73  93 /  10  30  20  30
Hobart OK         72  95  73  96 /  10  20  10  20
Wichita Falls TX  73  95  74  96 /   0  10  10  20
Gage OK           69  92  71  97 /  30  20  10  20
Ponca City OK     71  90  72  92 /  50  40  20  40
Durant OK         75  93  72  91 /   0  30  30  30

&&

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

10/09/09

Hazardous weather outlook, Jul 7, 11:54 AM CDT, 9 hours 14 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1154 AM CDT Fri Jul 7 2017

OKZ004>048-050>052-TXZ083>090-081700-
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-
1154 AM CDT Fri Jul 7 2017

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

.DAY ONE...This Afternoon and Tonight...

.Thunderstorms...
Isolated to scattered thunderstorms will be possible this evening
and overnight across portions of northern Oklahoma. There is a
Marginal Risk of severe thunderstorms through the late evening,
primarily north of a line from Arnett to Watonga to Chandler. The
primary concern would be wind gust to 60 mph and hail up to
quarter size. Locally heavy rainfall will also be possible.

.Heat...
Temperatures and heat index values will approach 100 across the
area today.

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

.Thunderstorms...
There is a chance of thunderstorms Saturday and Sunday. A few of
the storms may be severe Saturday afternoon and evening where
there is a marginal risk of severe weather across the entire area.
Heavy rain and localized flooding will also be possible.

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

Kurtz

In the hours before

Special weather statement, Jul 7, 6:56 PM CDT, 2 hours 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
656 PM CDT FRI JUL 7 2017

OKZ006-080030-
Alfalfa OK-
656 PM CDT FRI JUL 7 2017

...SIGNIFICANT WEATHER ADVISORY FOR northern Alfalfa County Until 730
PM CDT...

AT 654 PM CDT, a strong thunderstorm was located 4 miles south of
Byron, moving southwest at 30 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...

Locations impacted include...
Cherokee, Amorita, Byron, northwestern Great Salt Plains Lake,
Driftwood and Ingersoll.

LAT...LON 3689 9811 3671 9821 3679 9851 3700 9829
TIME...MOT...LOC 2354Z 24DEG 24KT 3684 9828

WR

Special weather statement, Jul 7, 7:26 PM CDT, 1 hour 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
726 PM CDT FRI JUL 7 2017

OKZ017-080115-
Blaine OK-
726 PM CDT FRI JUL 7 2017

...SIGNIFICANT WEATHER ADVISORY FOR northeastern Blaine County Until
815 PM CDT...

AT 724 PM CDT, a strong thunderstorm was located 4 miles north of
Hitchcock, moving southeast at 10 MPH.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...

Locations impacted include...
Watonga, Okeene, Hitchcock and Southard.

LAT...LON 3614 9830 3596 9821 3590 9821 3587 9845
      3608 9853
TIME...MOT...LOC 0024Z 335DEG 7KT 3604 9837

WR

Local storm report, Jul 7, 7:43 PM CDT, 1 hour 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
743 PM CDT FRI JUL 7 2017

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

0738 PM     HAIL             3 S BRECKENRIDGE        36.40N 97.73W
07/07/2017  E1.75 INCH       GARFIELD           OK   TRAINED SPOTTER

            RELAYED BY EM.

&&

JP

Local storm report, Jul 7, 7:53 PM CDT, 1 hour 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
753 PM CDT FRI JUL 7 2017

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

0748 PM     HAIL             5 WSW FAIRMONT          36.33N 97.78W
07/07/2017  E1.75 INCH       GARFIELD           OK   PUBLIC

&&

JP

Special weather statement, Jul 7, 7:55 PM CDT, 1 hour 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
755 PM CDT FRI JUL 7 2017

OKZ012-018-080130-
Garfield OK-Kingfisher OK-
755 PM CDT FRI JUL 7 2017

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Garfield and
northeastern Kingfisher Counties Until 830 PM CDT...

AT 754 PM CDT, a strong thunderstorm was located near Bison, moving
south at 15 MPH.

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

Locations impacted include...
Hennessey and Bison.

LAT...LON 3626 9799 3625 9781 3607 9777 3608 9803
TIME...MOT...LOC 0054Z 346DEG 11KT 3617 9790

WR

Special weather statement, Jul 7, 9:04 PM CDT, 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
904 PM CDT FRI JUL 7 2017

OKZ017>019-080230-
Kingfisher OK-Logan OK-Blaine OK-
904 PM CDT FRI JUL 7 2017

...SIGNIFICANT WEATHER ADVISORY FOR Kingfisher...southwestern Logan
and central Blaine Counties Until 930 PM CDT...

AT 903 PM CDT, strong thunderstorms were along a line extending from
6 miles east of Dover to 3 miles southwest of Loyal to 5 miles east
of Canton, moving southeast at 15 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 40 MPH...

Locations impacted include...
Guthrie, Watonga, Kingfisher, Crescent, Okarche, Cashion, Canton,
Dover, Cedar Valley, Cimarron City, Hitchcock, Loyal, southeastern
Canton Lake, Seward, Southard, Omega and Navina.

This includes Interstate 35 between mile markers 151 and 152.

LAT...LON 3604 9822 3608 9771 3578 9739 3572 9796
      3576 9847 3613 9863
TIME...MOT...LOC 0203Z 323DEG 14KT 3600 9779 3595 9817 3603 9849

WR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 7:12 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	33 min
Jul 7, 7:16 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	44 min
Jul 7, 7:26 PM CDT	Special Weather Statement	OUN	Blaine	49 min
Jul 7, 7:37 PM CDT	Areal Flood Advisory	OUN	Garfield	53 min
Jul 7, 7:42 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	48 min
Jul 7, 7:55 PM CDT	Special Weather Statement	OUN	Kingfisher	35 min
Jul 7, 8:04 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher	41 min
Jul 7, 8:07 PM CDT	Areal Flood Warning	OUN	Garfield	3 hr
Jul 7, 9:04 PM CDT	Special Weather Statement	OUN	Blaine, Kingfisher	26 min
Jul 8, 1:27 AM CDT	Special Weather Statement	OUN	Woods	33 min
Jul 8, 2:36 AM CDT	Special Weather Statement	OUN	Grant	24 min
Jul 8, 3:00 AM CDT	Special Weather Statement	OUN	Grant	30 min
Jul 8, 3:09 AM CDT	Special Weather Statement	OUN	Woods, Woodward	36 min
Jul 8, 1:48 PM CDT	Special Weather Statement	OUN	Marshall	27 min
Jul 8, 3:31 PM CDT	Special Weather Statement	OUN	Murray	29 min
Jul 8, 3:56 PM CDT	Areal Flood Advisory	OUN	Carter, Murray	3 hr
Jul 8, 4:04 PM CDT	Special Weather Statement	OUN	Murray	26 min
Jul 8, 4:05 PM CDT	Special Weather Statement	OUN	Jefferson	25 min
Jul 8, 4:23 PM CDT	Special Weather Statement	OUN	Grady	22 min
Jul 8, 4:34 PM CDT	Severe Thunderstorm Warning	OUN	Grady	41 min
Jul 8, 4:36 PM CDT	Special Weather Statement	OUN	Murray	24 min
Jul 8, 4:47 PM CDT	Areal Flood Advisory	OUN	Grady	3 hr
Jul 8, 5:03 PM CDT	Severe Thunderstorm Warning	OUN	Grady	25 min
Jul 8, 5:07 PM CDT	Special Weather Statement	OUN	Garvin	23 min
Jul 8, 5:09 PM CDT	Special Weather Statement	OUN	Garvin	36 min
Jul 8, 5:25 PM CDT	Severe Thunderstorm Warning	OUN	Garvin	37 min
Jul 8, 5:34 PM CDT	Special Weather Statement	OUN	Garvin	26 min
Jul 8, 5:39 PM CDT	Areal Flood Advisory	OUN	Garvin, McClain, Pottawatomie	3 hr
Jul 8, 5:49 PM CDT	Special Weather Statement	OUN	McClain	26 min
Jul 8, 5:58 PM CDT	Special Weather Statement	OUN	McClain	32 min
Jul 8, 6:11 PM CDT	Special Weather Statement	OUN	Pottawatomie	34 min
Jul 8, 6:23 PM CDT	Special Weather Statement	OUN	Comanche	37 min
Jul 8, 6:26 PM CDT	Severe Thunderstorm Warning	OUN	McClain	20 min
Jul 8, 6:36 PM CDT	Special Weather Statement	OUN	Kiowa	24 min
Jul 8, 6:43 PM CDT	Special Weather Statement	OUN	Stephens	32 min
Jul 8, 6:45 PM CDT	Special Weather Statement	OUN	Pottawatomie	30 min
Jul 8, 6:54 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	51 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.