Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 228, NWS Tulsa, OK

August 7, 2018Cherokee County, Wagoner County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 7, 2018, 5:50 PM CDT for Cherokee County, Wagoner County, Oklahoma. It was in force for 40 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: Aug 7, 2018, 5:50 PM CDT (22:50 UTC)
Expired: Aug 7, 2018, 6:30 PM CDT
In force: 40 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Cherokee County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 48 km from the middle of the area, began a volume at 22:54 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

Springfield, MO (KSGF), launched 12:00Z, 10.8 hours before the alert went out and 165 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: 738 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1516 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

120 
WUUS54 KTSA 072250
SVRTSA
OKC021-145-072330-
/O.NEW.KTSA.SV.W.0228.180807T2250Z-180807T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
550 PM CDT TUE AUG 7 2018

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Southeastern Wagoner County in northeastern Oklahoma...
  Western Cherokee County in east central Oklahoma...

* Until 630 PM CDT.

* At 550 PM CDT, a severe thunderstorm was located 3 miles east of
  Wagoner, moving east at 25 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations in or near the path include...
  Tahlequah...                      Wagoner...
  Fort Gibson...                    Okay...
  Hulbert...                        Sequoyah State Park...
  Lost City...                      

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3604 9498 3574 9498 3578 9513 3581 9513
      3581 9527 3585 9542 3606 9535
TIME...MOT...LOC 2250Z 290DEG 24KT 3595 9531 

HAIL...<.75IN
WIND...70MPH
 
$$

Lacy

2 follow-up statements

349 
WWUS54 KTSA 072305
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
605 PM CDT TUE AUG 7 2018

OKC145-072314-
/O.CAN.KTSA.SV.W.0228.000000T0000Z-180807T2330Z/
Wagoner OK-
605 PM CDT TUE AUG 7 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WAGONER 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 3604 9498 3574 9498 3578 9513 3581 9513
      3582 9527 3586 9523 3588 9525 3590 9528
      3592 9528 3593 9527 3597 9528 3599 9523
      3604 9523 3604 9521 3605 9521
TIME...MOT...LOC 2304Z 290DEG 24KT 3592 9520 

$$

OKC021-072330-
/O.CON.KTSA.SV.W.0228.000000T0000Z-180807T2330Z/
Cherokee OK-
605 PM CDT TUE AUG 7 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR WESTERN CHEROKEE COUNTY...

At 604 PM CDT, a severe thunderstorm was located 3 miles northeast of
Sequoyah State Park, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations in or near the path include...
Tahlequah...                      Hulbert...
Sequoyah State Park...            Lost City...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3604 9498 3574 9498 3578 9513 3581 9513
      3582 9527 3586 9523 3588 9525 3590 9528
      3592 9528 3593 9527 3597 9528 3599 9523
      3604 9523 3604 9521 3605 9521
TIME...MOT...LOC 2304Z 290DEG 24KT 3592 9520 

HAIL...<.75IN
WIND...60MPH
 
$$

Lacy

718 
WWUS54 KTSA 072327
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
627 PM CDT TUE AUG 7 2018

OKC021-072336-
/O.EXP.KTSA.SV.W.0228.000000T0000Z-180807T2330Z/
Cherokee OK-
627 PM CDT TUE AUG 7 2018

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN CHEROKEE COUNTY WILL
EXPIRE AT 630 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire.

However, strong winds to 50 mph and dangerous lightning are still 
possible with the complex of storms.

LAT...LON 3604 9498 3574 9498 3578 9513 3581 9513
      3582 9527 3586 9523 3588 9525 3590 9528
      3592 9528 3593 9527 3597 9528 3599 9523
      3604 9523 3604 9521 3605 9521
TIME...MOT...LOC 2326Z 290DEG 24KT 3587 9503 

$$

Lacy

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 Aug 7, 2:25 PM CDT, 3 hours 25 minutes earlier.

Area forecast discussion, Aug 7, 2:25 PM CDT, 3 hours 25 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
225 PM CDT Tue Aug 7 2018

.DISCUSSION...
Atmosphere continues to destabilize across portions of northeast
Oklahoma behind initial thunderstorm activity that moved through
earlier today with surface based CAPE approaching 4000 J/KG over
Creek county. As strong diabatic heating continues in conjunction
with approaching upper wave, expect scattered strong to severe
thunderstorms to develop, generally west of Highway 75. Main
threat will be damaging downburst winds and to a lesser extent
nickel to quarter size hail.

Active weather pattern will persist for the next couple of days as
a series of level upper waves traverse the region in northwest
flow aloft. Thunderstorm complex could approach northeast Oklahoma
late tonight with storms spreading into southeast Oklahoma/west-
central Arkansas during the day. Although timing of storms becomes
less certain Wednesday night into Thursday, precipitation chances
will remain fairly high along and south of Interstate 40 with the
potential for heavy rainfall across far southeast Oklahoma.

Precip chances will begin to tapper off from north to south into
Friday. Dry conditions expected through the early part of the
weekend with near normal temperatures. Storm chances will once
again begin to increase Sunday/Monday as cut off low starts to
develop over far west Texas.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   74  89  70  90 /  50  40  40  20
FSM   74  89  71  88 /  50  60  60  50
MLC   74  88  70  87 /  50  60  60  50
BVO   71  88  67  89 /  40  40  20  10
FYV   72  85  67  87 /  50  50  50  30
BYV   71  86  67  89 /  50  50  40  30
MKO   73  87  70  88 /  50  50  50  30
MIO   71  87  67  89 /  40  40  20  10
F10   72  87  69  88 /  50  60  50  40
HHW   75  92  71  88 /  40  70  70  60

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...None.
AR...None.
&&

LONG TERM....12

Hazardous weather outlook, Aug 7, 2:47 PM CDT, 3 hours 3 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
247 PM CDT Tue Aug 7 2018

ARZ001-002-010-011-019-020-029-OKZ049-053>076-081030-
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-
247 PM CDT Tue Aug 7 2018

...ELEVATED SEVERE STORM RISK THIS AFTERNOON AND EARLY EVENING
ACROSS PORTIONS OF NORTHEAST AND EAST CENTRAL OKLAHOMA...

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

.DAY ONE...Today and Tonight.

SEVERE THUNDERSTORM.
	RISK...Elevated.
	AREA...Along and west of highway 75, along and south of highway 412 in northeast
			and east central Oklahoma.
	ONSET...After 3 PM.

HEAVY RAIN.
	RISK...Limited.
 	AREA...Much of northeast and east central Oklahoma and northwest Arkansas.
	ONSET...After 3 PM.

DANGEROUS HEAT.
	RISK...Limited.
	AREA...Primarily along and south of Interstate 40.
	ONSET...Ongoing.

DISCUSSION...

There is an elevated risk of severe hail to the size of golfballs
and damaging winds to 70 mph this afternoon mainly across portions
of northeast and east central Oklahoma, along/west of highway 75
and along/south of highway 412. This threat will be greatest from
around 3 PM to 9 PM this evening. Weak low level shear will keep
the tornado potential very low, but nonzero.

Scattered thunderstorms are developing across north central
Oklahoma along an outflow boundary from previous storms last night
into this morning. These storms will move generally east and
southeast into portions of eastern Oklahoma thru the early evening
hours.

Another round of storms is expected to form this evening across
Kansas and move into northeast Oklahoma after midnight. With ample
instability, a few strong to marginally severe storms are
possible this afternoon into the overnight. Locally heavy rainfall
will be possible primarily across northeast Oklahoma into
northwest Arkansas where the most concentrated activity is
expected.

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

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.
WEDNESDAY...Thunderstorm Potential...Heavy Rain Potential.
THURSDAY thru MONDAY...Thunderstorm Potential.

EXTENDED DISCUSSION...

Scattered to numerous thunderstorms are expected Wednesday through
Wednesday night with locally heavy rainfall possible. The heaviest
rains will likely focus across southeast Oklahoma and continue to
shift southward into Thursday. Unsettled weather is expected to
continue into early next week as a number of disturbances remain
across the region.

weather.gov/tulsa contains additional information.

Lacy

In the hours before

Local storm report, Aug 7, 5:10 PM CDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
510 PM CDT TUE AUG 7 2018

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

0444 PM     FLASH FLOOD      TULSA                   36.13N 95.92W
08/07/2018                   TULSA              OK   AMATEUR RADIO

            STREET FLOODING I-44 BETWEEN 51ST STREET AND UNION TO
            PEORIA

0445 PM     FLASH FLOOD      TULSA                   36.13N 95.92W
08/07/2018                   TULSA              OK   EMERGENCY MNGR

            STREET FLOODING NEAR 19TH AND BOULDER

0452 PM     FLASH FLOOD      TULSA                   36.13N 95.92W
08/07/2018                   TULSA              OK   BROADCAST MEDIA

            STREET FLOODING AT 6TH AND FRANKFORT. ONE CAR STRANDED.

&&

DMJ

Local storm report, Aug 7, 5:18 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
518 PM CDT TUE AUG 7 2018

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

0445 PM     TSTM WND DMG     TULSA                   36.13N 95.92W
08/07/2018                   TULSA              OK   PUBLIC

            TREES LIMBS DOWN 41ST STREET AND SKELLY DRIVE

&&

DMJ

Special weather statement, Aug 7, 5:19 PM CDT, 31 minutes before

Special Weather Statement
National Weather Service Tulsa OK
519 PM CDT TUE AUG 7 2018

OKZ060-067-070-072245-
Tulsa OK-Muskogee OK-Wagoner OK-
519 PM CDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN WAGONER...
NORTHWESTERN MUSKOGEE AND SOUTHEASTERN TULSA COUNTIES UNTIL 545 PM
CDT...

At 519 PM CDT, strong thunderstorms were located along a line
extending from 2 miles southeast of Broken Arrow to near Bixby.
Movement was east at 25 mph.

Wind gusts of 50 to 55 mph will be possible with these storms.

Locations in or near the path include...
Broken Arrow...                   Bixby...
Haskell...                        Stonebluff...
Leonard...

LAT...LON 3609 9576 3596 9576 3591 9565 3577 9563
      3583 9577 3586 9577 3586 9584 3591 9598
TIME...MOT...LOC 2219Z 274DEG 21KT 3603 9577 3592 9588

Lacy

Special weather statement, Aug 7, 5:23 PM CDT, 27 minutes before

Special Weather Statement
National Weather Service Tulsa OK
523 PM CDT TUE AUG 7 2018

ARZ010-019-OKZ069-072315-
Washington AR-Crawford AR-Adair OK-
523 PM CDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CRAWFORD...
SOUTHWESTERN WASHINGTON AND SOUTHEASTERN ADAIR COUNTIES UNTIL 615 PM
CDT...

At 523 PM CDT, a strong thunderstorm was located 3 miles south of
Stilwell, moving east at 15 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations in or near the path include...
Stilwell...                       Adair State Park...
Maryetta...                       Odell...

LAT...LON 3560 9444 3561 9447 3564 9448 3564 9452
      3572 9472 3586 9467 3584 9437
TIME...MOT...LOC 2223Z 283DEG 6KT 3577 9463

Special weather statement, Aug 7, 5:25 PM CDT, 25 minutes before

Special Weather Statement
National Weather Service Tulsa OK
525 PM CDT TUE AUG 7 2018

OKZ060-064-066-072300-
Tulsa OK-Okmulgee OK-Creek OK-
525 PM CDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL CREEK...NORTHERN
OKMULGEE AND SOUTHEASTERN TULSA COUNTIES UNTIL 600 PM CDT...

At 525 PM CDT, a strong thunderstorm was located over Mounds, moving
east at 20 mph.

Dime size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations in or near the path include...
Tulsa...                          Broken Arrow...
Bixby...                          Jenks...
Glenpool...                       Kiefer...
Mounds...                         Liberty...
Hectorville...

This storm 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.

LAT...LON 3604 9583 3590 9580 3590 9582 3586 9582
      3585 9579 3577 9577 3577 9615 3595 9618
TIME...MOT...LOC 2225Z 261DEG 16KT 3588 9608

Local storm report, Aug 7, 5:42 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
542 PM CDT TUE AUG 7 2018

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

0454 PM     TSTM WND DMG     4 NNE BROKEN ARROW      36.11N 95.76W
08/07/2018                   WAGONER            OK   PUBLIC

            ONE INCH TREE LIMBS DOWN

0454 PM     TSTM WND DMG     NE BROKEN ARROW         36.05N 95.79W
08/07/2018                   TULSA              OK   BROADCAST MEDIA

            POWER POLES DOWN BETWEEN 51ST STREET AND 41ST STREET ON S
            209TH E AVE

0445 PM     FLASH FLOOD      TULSA                   36.13N 95.92W
08/07/2018                   TULSA              OK   PUBLIC

            STREET FLOODING ON BRADY STREET

&&

DMJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 3:09 PM CDT	Special Weather Statement	TSA	Pawnee	36 min
Aug 7, 3:41 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa	49 min
Aug 7, 3:56 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Tulsa	37 min
Aug 7, 4:13 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa	47 min
Aug 7, 4:24 PM CDT	Special Weather Statement	TSA	Tulsa	51 min
Aug 7, 4:34 PM CDT	Areal Flood Advisory	TSA	Osage, Rogers, Tulsa, Wagoner	57 min
Aug 7, 4:37 PM CDT	Severe Thunderstorm Warning	TSA	Tulsa	38 min
Aug 7, 4:47 PM CDT	Severe Thunderstorm Warning	TSA	Wagoner	43 min
Aug 7, 4:54 PM CDT	Special Weather Statement	TSA	Okfuskee	51 min
Aug 7, 5:13 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Muskogee, Wagoner	47 min
Aug 7, 5:19 PM CDT	Special Weather Statement	TSA	Tulsa	26 min
Aug 7, 5:23 PM CDT	Special Weather Statement	TSA	Adair	52 min
Aug 7, 5:25 PM CDT	Special Weather Statement	TSA	Tulsa	35 min
Aug 7, 5:58 PM CDT	Special Weather Statement	TSA	Muskogee	47 min
Aug 7, 6:19 PM CDT	Special Weather Statement	TSA	Adair, Cherokee, Sequoyah	41 min
Aug 7, 6:40 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Sequoyah	50 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2018 Every severe thunderstorm warning in 2018

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.