Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 227, NWS Tulsa, OK

August 7, 2018Cherokee County, Muskogee County, Wagoner County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 7, 2018, 5:13 PM CDT for Cherokee County, Muskogee County, Wagoner County, Oklahoma. It was in force for 47 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, 5:13 PM CDT (22:13 UTC)
Expired: Aug 7, 2018, 6:00 PM CDT
In force: 47 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cherokee County, OK, Muskogee County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 21 km from the middle of the area, began a volume at 22:16 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, 10.2 hours before the alert went out and 178 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.

900 
WUUS54 KTSA 072213
SVRTSA
OKC021-101-145-072300-
/O.NEW.KTSA.SV.W.0227.180807T2213Z-180807T2300Z/

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

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Wagoner County in northeastern Oklahoma...
  Northwestern Cherokee County in east central Oklahoma...
  Northeastern Muskogee County in east central Oklahoma...

* Until 600 PM CDT.

* At 513 PM CDT, severe thunderstorms were located along a line
  extending from 5 miles southwest of Inola to 7 miles east of Coweta
  to 3 miles west of Porter, moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations in or near the path include...
  Muskogee...                       Wagoner...
  Coweta...                         Fort Gibson...
  Okay...                           Hulbert...
  Porter...                         Tullahassee...
  Sequoyah State Park...            Redbird...
  Lost City...                      Choska...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3611 9557 3609 9555 3608 9558 3607 9557
      3607 9513 3588 9506 3569 9518 3582 9564
      3612 9570
TIME...MOT...LOC 2213Z 283DEG 32KT 3610 9558 3599 9552 3586 9559 

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

Lacy

1 follow-up statement

476 
WWUS54 KTSA 072234
SVSTSA

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

OKC021-101-145-072300-
/O.CON.KTSA.SV.W.0227.000000T0000Z-180807T2300Z/
Wagoner OK-Cherokee OK-Muskogee OK-
534 PM CDT TUE AUG 7 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM CDT
FOR WAGONER...NORTHWESTERN CHEROKEE AND NORTHEASTERN MUSKOGEE
COUNTIES...

At 534 PM CDT, severe thunderstorms were located along a line
extending from 6 miles south of Inola to 5 miles west of Wagoner to 3
miles southwest of Porter, moving southeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations in or near the path include...
Muskogee...                       Wagoner...
Coweta...                         Fort Gibson...
Okay...                           Hulbert...
Porter...                         Tullahassee...
Sequoyah State Park...            Redbird...
Lost City...                      Choska...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3607 9513 3588 9506 3569 9518 3582 9564
      3594 9566 3603 9556 3607 9552
TIME...MOT...LOC 2234Z 294DEG 40KT 3606 9547 3593 9547 3584 9557 

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

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, 2 hours 48 minutes earlier.

Area forecast discussion, Aug 7, 2:25 PM CDT, 2 hours 48 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, 2 hours 26 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

Special weather statement, Aug 7, 4:54 PM CDT, 19 minutes before

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

OKZ065-072245-
Okfuskee OK-
454 PM CDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN OKFUSKEE COUNTY UNTIL 545
PM CDT...

At 454 PM CDT, a strong thunderstorm was located 6 miles north of
Prague, moving southeast at 20 mph.

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

Locations in or near the path include...
Boley...                          Paden...
Bearden...                        Castle...
Welty...                          Mason...

This includes Interstate 40 in Oklahoma between mile markers 212 and
218.

LAT...LON 3564 9662 3564 9646 3558 9620 3529 9642
      3529 9644 3546 9644 3546 9647 3543 9650
      3543 9652 3546 9654 3544 9657 3543 9656
      3542 9656 3541 9654 3539 9654 3541 9658
      3540 9660 3540 9662
TIME...MOT...LOC 2154Z 302DEG 18KT 3558 9666

Local storm report, Aug 7, 4:55 PM CDT, 18 minutes before

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

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

0444 PM     TSTM WND DMG     TULSA                   36.13N 95.92W
08/07/2018                   TULSA              OK   LAW ENFORCEMENT

            POWER LINES DOWN AT 14TH AND SHERIDAN.

0444 PM     TSTM WND DMG     TULSA                   36.13N 95.92W
08/07/2018                   TULSA              OK   EMERGENCY MNGR

            POWER LINES DOWN 2400 S UTICA

&&

DMJ

Special weather statement, Aug 7, 5:02 PM CDT, 11 minutes before

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

ARZ010-072230-
Washington AR-
502 PM CDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL WASHINGTON COUNTY
UNTIL 530 PM CDT...

At 501 PM CDT, a strong thunderstorm was located 3 miles northwest of
Lincoln, moving east at 15 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations in or near the path include...
Fayetteville...                   Farmington...
Prairie Grove...                  West Fork...
Lincoln...                        Greenland...
Cincinnati...                     Prairie Grove Battlefield State...
Walnut Grove...                   Rhea...
Canehill...                       Hogeye...
Summers...                        Viney Grove...
Clyde...

This includes Interstate 49 between mile markers 51 and 64.

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 3589 9447 3604 9453 3612 9420 3590 9415
TIME...MOT...LOC 2201Z 264DEG 13KT 3598 9446

Lacy

Local storm report, Aug 7, 5:04 PM CDT, 9 minutes before

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

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

0455 PM     TSTM WND GST     N BROKEN ARROW          36.05N 95.79W
08/07/2018  E60 MPH          TULSA              OK   NWS EMPLOYEE

            POWER OUT 41ST STREET AND COUNTY LINE ROAD

&&

DMJ

Local storm report, Aug 7, 5:06 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
506 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

            TREEE DOWN ON A HOME AT 51ST STREET AND SHERIDAN

&&

DMJ

Local storm report, Aug 7, 5:10 PM CDT, 3 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

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, 5:19 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, 5:50 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Wagoner	40 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.