Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 457, NWS Tulsa, OK

October 21, 20174 counties in Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Oct 21, 2017, 9:26 PM CDT for 4 counties in Oklahoma. It was in force for 34 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: Oct 21, 2017, 9:26 PM CDT (02:26 UTC)
Expired: Oct 21, 2017, 10:00 PM CDT
In force: 34 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Craig County, OK, Nowata County, OK, Rogers County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 62 km from the middle of the area, began a volume at 02:27 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
Oct 21, 7:24 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.4 hours before the alert went out and 168 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: 700 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1064 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

708 
WUUS54 KTSA 220226
SVRTSA
OKC035-105-131-147-220300-
/O.NEW.KTSA.SV.W.0457.171022T0226Z-171022T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
926 PM CDT SAT OCT 21 2017

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Southwestern Craig County in northeastern Oklahoma...
  Northern Rogers County in northeastern Oklahoma...
  Southern Washington County in northeastern Oklahoma...
  Nowata County in northeastern Oklahoma...

* Until 1000 PM CDT

* At 926 PM CDT, a severe thunderstorm was located near Ramona,
  moving east at 45 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 in or near the path include...
  Bartlesville...                   Nowata...
  Chelsea...                        Ramona...
  Ochelata...                       Delaware...
  Lenapah...                        Talala...
  Big Cabin...                      Vera...
  New Alluwe...                     Watova...
  White Oak...                      Centralia...

This includes Interstate 44 near mile marker 276.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 200 AM CDT for northeastern
Oklahoma.

LAT...LON 3699 9545 3654 9522 3643 9593 3669 9600
      3671 9600
TIME...MOT...LOC 0226Z 250DEG 41KT 3654 9588 

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

1 follow-up statement

516 
WWUS54 KTSA 220240
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
940 PM CDT SAT OCT 21 2017

OKC035-105-131-147-220300-
/O.CON.KTSA.SV.W.0457.000000T0000Z-171022T0300Z/
Craig OK-Rogers OK-Washington OK-Nowata OK-
940 PM CDT SAT OCT 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR SOUTHWESTERN CRAIG...NORTHERN ROGERS...SOUTHERN WASHINGTON AND
NOWATA COUNTIES...

At 939 PM CDT, a severe thunderstorm was located over Watova, moving
northeast at 45 mph.

HAZARD...70 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings. 

Locations in or near the path include...
Bartlesville...                   Nowata...
Chelsea...                        Ramona...
Ochelata...                       Delaware...
Lenapah...                        Talala...
Big Cabin...                      Vera...
New Alluwe...                     Watova...
White Oak...                      Centralia...

This includes Interstate 44 near mile marker 276.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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

&&

A tornado watch remains in effect until 200 AM CDT for northeastern
Oklahoma.

LAT...LON 3699 9545 3654 9522 3643 9593 3669 9600
      3671 9600
TIME...MOT...LOC 0239Z 247DEG 40KT 3660 9568 

HAIL...1.25IN
WIND...70MPH
 
$$

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 21, 6:41 PM CDT, 2 hours 45 minutes earlier.

Area forecast discussion, Oct 21, 6:41 PM CDT, 2 hours 45 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
641 PM CDT Sat Oct 21 2017

.AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
Cold front extended from Topeka to Weatherford this evening.
Strong to severe thunderstorms will affect all terminals within
the next few hours. Best potential for severe gusts will be with
initial line, affecting KBVO/KTUL/KRVS before midnight. A
prolonged period of rain may reduce visibility and ceilings for
several hours. Wind threat will diminish as cold front eventually
undercuts the convective line.

SHORT TERM...08
AVIATION...06

CORFIDI

Hazardous weather outlook, Oct 21, 5:17 PM CDT, 4 hours 9 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
517 PM CDT Sat Oct 21 2017

ARZ001-002-010-011-019-020-029-OKZ049-053>076-221045-
Adair OK-Benton AR-Carroll AR-Cherokee OK-Choctaw OK-Craig OK-
Crawford AR-Creek OK-Delaware OK-Franklin AR-Haskell OK-Latimer OK-
Le Flore OK-Madison AR-Mayes OK-McIntosh OK-Muskogee OK-Nowata OK-
Okfuskee OK-Okmulgee OK-Osage OK-Ottawa OK-Pawnee OK-Pittsburg OK-
Pushmataha OK-Rogers OK-Sebastian AR-Sequoyah OK-Tulsa OK-Wagoner OK-
Washington OK-Washington AR-
517 PM CDT Sat Oct 21 2017

...Severe Thunderstorms Expected to Sweep Through Tonight...

This Outlook is for Northwest and West Central Arkansas as well as
much of Eastern Oklahoma.

.DAY ONE...Today and Tonight.
TORNADO.
	RISK...Limited.
	AREA...All of eastern Oklahoma and northwest Arkansas.
	ONSET...After 7pm...ending by 3am in Carroll and Madison Counties.

SEVERE THUNDERSTORM.
	RISK...Significant.
	AREA...All of eastern Oklahoma and northwest Arkansas.
	ONSET...After 7pm...end by 3am in Carroll and Madison Counties.

FLASH FLOOD.
	RISK...Elevated.
	AREA...Eastern Oklahoma...with a lesser threat in northwest Arkansas.
	ONSET...After 7pm.

RIVER FLOOD.
	RISK...Elevated.
	AREA...Northeast Oklahoma.
	ONSET...Ongoing.

DISCUSSION...
Thunderstorms will increase and spread across eastern Oklahoma and
northwest Arkansas this evening.  While a few storms could develop
ahead of the cold front, especially in the terrain of southeast
Oklahoma and northwest Arkansas, the main round of severe is expected
with storms developing a near a cold front moving in from the northwest.
Initial individual storm cell development to the west will transition to
a line of storms this evening that will sweep through the entire area.
While some potential for hail exits, especially earlier in the evening,
the main risk will be damaging wind and the potential for areas of rotation
to form within the line.  Because of this rotation potential, there is
some tornado threat anywhere along the line.  Scattered areas of strong
winds are also expected within the line.  Gusts of 60 to 70 mph are
expected in the most intense storms.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Activation of the Regional Spotter Network Expected.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.
SUNDAY...Thunderstorm Potential.
MONDAY...No Hazards.
TUESDAY...High Wind Potential.
WEDNESDAY...No Hazards.
THURSDAY...Thunderstorm Potential.
FRIDAY...Thunderstorm Potential.

EXTENDED DISCUSSION...
Thunderstorms will be ending from west to east later tonight
and early on Sunday morning.  Another front late next week is
expected to bring more thunderstorm chances on Thursday and Friday.
Rainfall tonight is expected to drive some creeks and rivers up
in northeast Oklahoma over the next couple of days.  A Flood
Warning is currently up for the Neosho River at Commerce, OK.

EMERGENCY MANAGEMENT PLANNING STATEMENT...
Emergency managers will need to activate their spotter networks tonight.
The evolution of circulations in squall lines can be very quick with
few visual clues for spotters and limited warning opportunities.  Spotters
should exercise caution and not attempt to intercept areas of rotation
where visibility is low.

weather.gov/tulsa contains additional information.

In the hours before

Local storm report, Oct 21, 7:48 PM CDT, 1 hour 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
748 PM CDT SAT OCT 21 2017

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

0740 PM     TSTM WND GST     7 SW BURBANK            36.62N 96.82W
10/21/2017  M59 MPH          OSAGE              OK   MESONET

&&

JDS

Local storm report, Oct 21, 7:52 PM CDT, 1 hour 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
752 PM CDT SAT OCT 21 2017

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

0745 PM     TSTM WND GST     BURBANK                 36.69N 96.73W
10/21/2017  E60 MPH          OSAGE              OK   PUBLIC

            REPORTED VERY HEAVY RAINFALL AND 60 MPH WINDS.

&&

JDS

Local storm report, Oct 21, 9:04 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
904 PM CDT SAT OCT 21 2017

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

0859 PM     TSTM WND GST     DEWEY                   36.80N 95.94W
10/21/2017  E60 MPH          WASHINGTON         OK   AMATEUR RADIO

&&

JDS

Local storm report, Oct 21, 9:05 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
905 PM CDT SAT OCT 21 2017

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

0901 PM     HAIL             1 WNW CLEVELAND         36.32N 96.48W
10/21/2017  E0.88 INCH       PAWNEE             OK   TRAINED SPOTTER

&&

JDS

Special weather statement, Oct 21, 9:09 PM CDT, 17 minutes before

Special Weather Statement
National Weather Service Tulsa OK
909 PM CDT SAT OCT 21 2017

OKZ054>056-059>061-064-220245-
Tulsa OK-Osage OK-Rogers OK-Pawnee OK-Nowata OK-Washington OK-
Creek OK-
909 PM CDT SAT OCT 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ROGERS...
SOUTHEASTERN OSAGE...NORTHERN CREEK...WASHINGTON...NOWATA...
SOUTHEASTERN PAWNEE AND TULSA COUNTIES UNTIL 945 PM CDT...

At 909 PM CDT, strong thunderstorms were located along a line
extending from 5 miles west of South Coffeyville to 8 miles east of
Drumright. Movement was east at 30 mph.

Nickel size hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations in or near the path include...
Tulsa...                          Bartlesville...
Sand Springs...                   Nowata...
Owasso...                         Bixby...
Sapulpa...                        Jenks...
Glenpool...                       Skiatook...
Catoosa...                        Collinsville...
Dewey...                          Mannford...
Kiefer...                         Sperry...
Mounds...                         Kellyville...
Oologah...                        South Coffeyville...

This includes Interstate 44 between mile markers 198 and 231.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A tornado watch remains in effect until 200 AM CDT for northeastern
Oklahoma.

LAT...LON 3696 9541 3694 9542 3694 9543 3691 9543
      3586 9599 3595 9660 3699 9581 3699 9541
TIME...MOT...LOC 0209Z 274DEG 25KT 3698 9571 3601 9646

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 21, 7:36 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	39 min
Oct 21, 8:13 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee, Washington	47 min
Oct 21, 9:09 PM CDT	Special Weather Statement	TSA	Nowata, Tulsa, Washington	36 min
Oct 21, 9:41 PM CDT	Special Weather Statement	TSA	Creek, Rogers, Tulsa	34 min
Oct 21, 9:53 PM CDT	Special Weather Statement	TSA	Mayes, Okmulgee, Rogers, Tulsa, Wagoner	37 min
Oct 21, 10:05 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	25 min
Oct 21, 10:11 PM CDT	Areal Flood Advisory	TSA	Creek, Osage, Rogers, Tulsa, Wagoner	2 hr
Oct 21, 10:28 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	47 min
Oct 21, 10:42 PM CDT	Special Weather Statement	TSA	McIntosh, Pittsburg	48 min
Oct 21, 10:47 PM CDT	Special Weather Statement	TSA	Wagoner	43 min
Oct 21, 11:27 PM CDT	Special Weather Statement	TSA	Adair, Cherokee, Muskogee	48 min
Oct 21, 11:30 PM CDT	Special Weather Statement	TSA	Haskell, Latimer, LeFlore, Pushmataha, Sequoyah	45 min
Oct 21, 11:33 PM CDT	Areal Flood Advisory	TSA	Adair, Cherokee, Delaware, Mayes, Muskogee, Wagoner	117 min
Oct 21, 11:56 PM CDT	Special Weather Statement	TSA	Choctaw	49 min
Oct 22, 12:04 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, Pittsburg, Pushmataha	41 min
Oct 22, 12:16 AM CDT	Special Weather Statement	TSA	Sequoyah	44 min
Oct 22, 12:41 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Sequoyah	34 min
Oct 22, 12:46 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	29 min
Oct 22, 12:53 AM CDT	Special Weather Statement	TSA	LeFlore	52 min
Oct 22, 1:08 AM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	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.