Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 32, NWS Norman, OK

March 26, 20174 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 26, 2017, 5:53 PM CDT for 4 counties in Oklahoma. It was in force for 40 min. 1 report 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: Mar 26, 2017, 5:53 PM CDT (22:53 UTC)
Expired: Mar 26, 2017, 6:33 PM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Cleveland County, OK, Lincoln County, OK, Oklahoma County, OK, Pottawatomie County, OK

The radar

The Norman radar (KTLX), 4 km from the middle of the area, began a volume at 22:57 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.

What was reported inside it

Time	Report	Where	Remark
Mar 26, 6:15 PM CDT	HAIL 1.75	6 Nnw Stella, 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 one storm report to this severe thunderstorm warning; the first came 22 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 26, 4:02 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.9 hours before the alert went out and 21 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: 1175 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 270 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

402 
WUUS54 KOUN 262253 RRA
SVROUN
OKC027-081-109-125-262345-
/O.NEW.KOUN.SV.W.0032.170326T2253Z-170326T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
553 PM CDT SUN MAR 26 2017

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southeastern Oklahoma County in central Oklahoma...
  Southwestern Lincoln County in central Oklahoma...
  Northeastern Cleveland County in central Oklahoma...
  Northwestern Pottawatomie County in central Oklahoma...

* Until 645 PM CDT

* At 553 PM CDT, a severe thunderstorm was located over southeastern
  Oklahoma City, or 4 miles southeast of Stanley Draper Lake, moving
  north at 50 mph.

  HAZARD...60 mph wind gusts and half dollar size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Eastern Oklahoma City, Norman, Midwest City, Choctaw, Harrah,
  McLoud, Spencer, Jones, Nicoma Park, Stella, Tinker Air Force Base,
  Stanley Draper Lake, Newalla, Lake Thunderbird and Little Axe.

This includes the following highways...
 Interstate 40 between mile markers 157 and 173.
 Interstate 240 between mile markers 9 and 16.

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 3516 9725 3520 9741 3553 9742 3562 9721
      3555 9705
TIME...MOT...LOC 2253Z 198DEG 41KT 3532 9729 

HAIL...1.25IN
WIND...60MPH
 
$$

3 follow-up statements

432 
WWUS54 KOUN 262311
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
611 PM CDT SUN MAR 26 2017

OKC027-081-109-125-262345-
/O.CON.KOUN.SV.W.0032.000000T0000Z-170326T2345Z/
Oklahoma OK-Lincoln OK-Cleveland OK-Pottawatomie OK-
611 PM CDT SUN MAR 26 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR SOUTHEASTERN OKLAHOMA...SOUTHWESTERN LINCOLN...NORTHEASTERN
CLEVELAND AND NORTHWESTERN POTTAWATOMIE COUNTIES...

At 610 PM CDT, a severe thunderstorm was located near Choctaw, moving
north at 45 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...
Eastern Oklahoma City, Midwest City, Choctaw, Harrah, McLoud,
Spencer, Jones, Nicoma Park, Stanley Draper Lake, Newalla and Tinker
Air Force Base.

This includes the following highways...
 Interstate 40 between mile markers 158 and 173.
 Interstate 240 between mile markers 10 and 16.

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 3532 9717 3533 9741 3553 9740 3562 9721
      3555 9705
TIME...MOT...LOC 2310Z 198DEG 41KT 3551 9721 

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

659 
WWUS54 KOUN 262321
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
621 PM CDT SUN MAR 26 2017

OKC027-125-262330-
/O.CAN.KOUN.SV.W.0032.000000T0000Z-170326T2345Z/
Cleveland OK-Pottawatomie OK-
621 PM CDT SUN MAR 26 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLEVELAND AND
NORTHWESTERN POTTAWATOMIE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area.

LAT...LON 3546 9710 3546 9714 3539 9714 3538 9715
      3540 9728 3555 9736 3562 9721 3555 9705
TIME...MOT...LOC 2320Z 198DEG 41KT 3563 9716 

$$

OKC081-109-262345-
/O.CON.KOUN.SV.W.0032.000000T0000Z-170326T2345Z/
Oklahoma OK-Lincoln OK-
621 PM CDT SUN MAR 26 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR SOUTHEASTERN OKLAHOMA AND SOUTHWESTERN LINCOLN COUNTIES...

At 620 PM CDT, a severe thunderstorm was located near Luther, moving
north at 45 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...
Midwest City, Choctaw, Harrah, Jones, Nicoma Park and Newalla. 

This includes Interstate 40 near mile marker 172.
 
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 3546 9710 3546 9714 3539 9714 3538 9715
      3540 9728 3555 9736 3562 9721 3555 9705
TIME...MOT...LOC 2320Z 198DEG 41KT 3563 9716 

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

213 
WWUS54 KOUN 262333
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
633 PM CDT SUN MAR 26 2017

OKC081-109-262342-
/O.CAN.KOUN.SV.W.0032.000000T0000Z-170326T2345Z/
Oklahoma OK-Lincoln OK-
633 PM CDT SUN MAR 26 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OKLAHOMA AND
SOUTHWESTERN LINCOLN COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.

LAT...LON 3546 9710 3546 9714 3539 9714 3538 9715
      3540 9728 3555 9736 3562 9721 3555 9705
TIME...MOT...LOC 2331Z 198DEG 41KT 3577 9710 

$$

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 Mar 26, 2:58 PM CDT, 2 hours 55 minutes earlier.

Area forecast discussion, Mar 26, 2:58 PM CDT, 2 hours 55 minutes before

Area Forecast Discussion
National Weather Service Norman OK
258 PM CDT Sun Mar 26 2017

.DISCUSSION...
Cirrostratus continues to stream overhead this afternoon ahead of
the mid to upper low currently centered over SW KS. A few elevated
storms developed within nose of low level moisture plume/WAA over
central OK around 1 PM and have moved east of I35 now. Both the
previously mentioned cloud cover and early moist convection will
have an impact on instability for late this afternoon through this
evening. However, despite cloud cover some CU can be seen through
thin cirrus from near Chickasha to Lawton where an instability
axis resides. This instability axis should slowly start to expand
north and eastward through the late afternoon hours as height
falls commence. The HRRR continues to indicate rapid development
will occur along/ahead of the dryline around 23Z across central
and south central OK. Very large hail and damaging wind gusts over
70 mph (especially east of I35 later this evening) will be
possible. In addition, ~850 mb flow will begin to veer this
evening increasing low level shear specifically along the I35
corridor. LCLs will also continue to lower as dewpoints climb
into the low 60s. Expect highest tornado potential to be some
time around 23-02Z this evening. The storms should quickly exit
our eastern zones before 06Z tonight.

A subtle cold front will accompany the mid to upper low late
tonight through tomorrow morning, with some dry air advection. It
will be a beautiful day tomorrow under the influence of a weak
surface ridge, although some stratus may try to liner over the NE.
The low level flow will then quickly return from the SE Tuesday as
the next upper low traverses the four corners region. A fairly
sharp dryline is expected by Tue afternoon from the NW panhandles
into western north TX. Stout WAA and accompanying stratus may
limit the severe potential Tue to a narrow axis over the SW. Later
through the evening Tue, widespread showers and thunderstorms are
expected with the approach of the closed low. This low will slowly
meander over the central and southern plains through Thu, which
could bust some of the drought. Some locations could receive over
3 inches of rainfall through late Thu. A brief break in rain
chances will occur on Friday before yet another, even deeper,
closed low passes over the southern plains.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  52  70  48  75 /  30   0   0  20
Hobart OK         50  71  48  73 /  10   0   0  40
Wichita Falls TX  51  75  51  78 /   0   0   0  40
Gage OK           44  71  45  68 /  30   0   0  60
Ponca City OK     50  67  45  72 /  60  10   0  10
Durant OK         59  75  51  77 /  50   0   0  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Red Flag Warning until 8 PM CDT this evening for OKZ021-033-034-
     036-037.

TX...Red Flag Warning until 8 PM CDT this evening for TXZ083>089.

&&

26/03

Hazardous weather outlook, Mar 26, 11:51 AM CDT, 6 hours 2 minutes before

Hazardous Weather Outlook...corrected...
National Weather Service Norman OK
1151 AM CDT Sun Mar 26 2017

OKZ004>048-050>052-TXZ083>090-271700-
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-
1151 AM CDT Sun Mar 26 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...
There is a Moderate Risk of severe thunderstorms across parts of
Oklahoma, surrounded by Slight and Enhanced Risk areas that cover
additional parts of Oklahoma and western north Texas.

Location...
The Moderate Risk area is east of a line from Waurika to Duncan
to El Reno to Guthrie, and south of a line from Guthrie to Stroud.
This includes the Oklahoma City metropolitan area, Pauls Valley,
Ardmore, Seminole, Ada, Atoka and Durant.

To the west of the Moderate Risk area, there is a Slight and
Enhanced Risk of severe weather across northern and western
Oklahoma, to the east of a line from Laverne to Clinton to Lawton
to Clay County Texas.

Timing...
4 pm through midnight.

Impacts...
Large hail up to tennis ball size will be the main hazard.
Damaging winds and tornadoes will also be possible.

Discussion...
Much higher humidity continues to move north through north Texas
and into Oklahoma this afternoon. This moisture will allow the
atmosphere to become very unstable this afternoon and evening.

Scattered storms are expected to develop mid to late afternoon
across western sections of north Texas and western Oklahoma and
become severe as they move east-northeast. The atmospheric wind
shear will support supercell thunderstorms with the associated
risk of large hail, damaging winds, and the potential of isolated
tornadoes. The highest chances of severe weather will be across
central, south central and southeast Oklahoma where instability
will be the highest. Storms are expected to move out of the area
around or just after midnight.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across
central, western, and southern Oklahoma and portions of north
Texas should prepare for severe weather operations from about
4 pm through midnight.

.Fire weather...
Fire Danger will be very high across southwestern Oklahoma and
western north Texas as dry air moves in behind a dryline. A Red
Flag Warning is in effect through early evening for this area.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

.Thunderstorms...
There is a slight risk of severe thunderstorms again on Tuesday
and Wednesday. There is also a chance of thunderstorms on Thursday
and Saturday.

.Heavy rain...
Heavy rain is possible on Tuesday, and likely on Wednesday.

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

removed excessive characters in first paragraph.

In the hours before

Local storm report, Mar 26, 5:22 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
522 PM CDT SUN MAR 26 2017

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

0518 PM     HAIL             1 SSW PURCELL           35.00N 97.37W
03/26/2017  U1.00 INCH       MCCLAIN            OK   BROADCAST MEDIA

            .

&&

NWS NORMAN OK
IRIS SYSTEM

Special weather statement, Mar 26, 5:31 PM CDT, 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
531 PM CDT SUN MAR 26 2017

OKZ030-262300-
Pottawatomie OK-
531 PM CDT SUN MAR 26 2017

...SIGNIFICANT WEATHER ADVISORY FOR central Pottawatomie County Until
600 PM CDT...

AT 530 PM CDT, a strong thunderstorm was located 4 miles north of
Wanette, moving northeast at 30 MPH.

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

LAT...LON 3500 9693 3498 9714 3499 9714 3528 9696
      3524 9678 3512 9678
TIME...MOT...LOC 2230Z 214DEG 28KT 3502 9702

..speg.

Special weather statement, Mar 26, 5:38 PM CDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
538 PM CDT SUN MAR 26 2017

OKZ006-007-262315-
Alfalfa OK-Grant OK-
538 PM CDT SUN MAR 26 2017

...SIGNIFICANT WEATHER ADVISORY FOR northeastern Alfalfa and
northwestern Grant Counties Until 615 PM CDT...

AT 536 PM CDT, the leading edge of strong and gusty thunderstorm
winds extended along a line extending from 4 miles north of Amorita
to near Byron to near Driftwood, moving east at 15 MPH.

HAZARDS INCLUDE...
Wind gusts to 50 MPH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Severe weather is not expected and no warnings are anticipated at
this time.

&&

LAT...LON 3688 9802 3678 9814 3686 9845 3691 9839
      3700 9838 3700 9801
TIME...MOT...LOC 2236Z 276DEG 13KT 3699 9832 3691 9832 3686 9838

MAHALE

Local storm report, Mar 26, 5:40 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
540 PM CDT SUN MAR 26 2017

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

0535 PM     HAIL             2 SSW WASHINGTON        35.03N 97.50W
03/26/2017  E1.00 INCH       MCCLAIN            OK   STORM CHASER

&&

EM

Local storm report, Mar 26, 5:41 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
541 PM CDT SUN MAR 26 2017

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

0539 PM     HAIL             2 SSE PAOLI             34.80N 97.25W
03/26/2017  E1.75 INCH       GARVIN             OK   STORM CHASER

&&

EM

Local storm report, Mar 26, 5:47 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
547 PM CDT SUN MAR 26 2017

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

0545 PM     HAIL             1 E PAOLI               34.83N 97.24W
03/26/2017  E2.50 INCH       GARVIN             OK   STORM CHASER

&&

EM

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 26, 3:31 AM CDT	Red Flag Warning	OUN	Beckham, Greer, Harmon, Jackson, Tillman	16 hr
Mar 26, 1:10 PM CDT	Special Weather Statement	OUN	Cleveland	35 min
Mar 26, 1:21 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma	23 min
Mar 26, 2:06 PM CDT	Special Weather Statement	OUN	Pottawatomie	24 min
Mar 26, 2:44 PM CDT	Special Weather Statement	OUN	Pottawatomie	31 min
Mar 26, 4:17 PM CDT	Special Weather Statement	OUN	Stephens	28 min
Mar 26, 4:32 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Stephens	43 min
Mar 26, 4:59 PM CDT	Special Weather Statement	OUN	McClain	31 min
Mar 26, 5:01 PM CDT	Special Weather Statement	OUN	Murray	29 min
Mar 26, 5:09 PM CDT	Severe Thunderstorm Warning	OUN	Garvin	51 min
Mar 26, 5:20 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	40 min
Mar 26, 5:31 PM CDT	Special Weather Statement	OUN	Pottawatomie	29 min
Mar 26, 5:38 PM CDT	Special Weather Statement	OUN	Alfalfa	37 min
Mar 26, 5:44 PM CDT	Severe Thunderstorm Warning	OUN	McClain, Pottawatomie	46 min
Mar 26, 5:52 PM CDT	Tornado Warning	OUN	Garvin, McClain	23 min
Mar 26, 5:53 PM CDT	Severe Thunderstorm Warning	OUN	Harper	52 min
Mar 26, 5:56 PM CDT	Special Weather Statement	OUN	Murray	34 min
Mar 26, 6:02 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray, Pontotoc	43 min
Mar 26, 6:14 PM CDT	Special Weather Statement	OUN	Alfalfa	31 min
Mar 26, 6:19 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	41 min
Mar 26, 6:21 PM CDT	Severe Thunderstorm Warning	OUN	Pontotoc, Pottawatomie, Seminole	39 min
Mar 26, 6:26 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love	49 min
Mar 26, 6:30 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	30 min
Mar 26, 6:36 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	22 min
Mar 26, 6:41 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	29 min
Mar 26, 6:41 PM CDT	Severe Thunderstorm Warning	OUN	Pontotoc	49 min
Mar 26, 6:55 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	50 min
Mar 26, 6:57 PM CDT	Special Weather Statement	OUN	Lincoln	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.