Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 69, NWS Tulsa, OK

May 15, 2018Pittsburg County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 15, 2018, 2:52 PM CDT for Pittsburg County, Oklahoma. It was in force for 38 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: May 15, 2018, 2:52 PM CDT (19:52 UTC)
Expired: May 15, 2018, 3:30 PM CDT
In force: 38 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Pittsburg County, OK

The radar

The Norman radar (KTLX), 142 km from the middle of the area, began a volume at 19:51 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 12:00Z, 7.9 hours before the alert went out and 147 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: 31 J/kg
Mixed-layer CIN: -367 J/kg
Mixed-layer LCL: 1479 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

544 
WUUS54 KTSA 151952
SVRTSA
OKC121-152030-
/O.NEW.KTSA.SV.W.0069.180515T1952Z-180515T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
252 PM CDT TUE MAY 15 2018

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Southwestern Pittsburg County in southeastern Oklahoma...

* Until 330 PM CDT

* At 251 PM CDT, severe thunderstorms were located along a line
  extending from 3 miles west of Mcalester to 2 miles northwest of
  Savanna to 5 miles east of Ashland, moving southeast at 10 mph.

  HAZARD...60 mph wind gusts and quarter 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...
  Mcalester...                      Hartshorne...
  Krebs...                          Kiowa...
  Savanna...                        Alderson...
  Ashland...                        Haywood...
  Mcalester Regional Airport...     Blanco...
  Haileyville...                    Pittsburg...
  Dow...                            Bache...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3467 9588 3468 9589 3468 9609 3481 9609
      3491 9596 3505 9585 3486 9555 3469 9576
      3460 9588
TIME...MOT...LOC 1951Z 329DEG 8KT 3492 9582 3485 9589 3477 9598 

HAIL...1.00IN
WIND...60MPH
 
$$

Lacy

2 follow-up statements

405 
WWUS54 KTSA 152010
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
310 PM CDT TUE MAY 15 2018

OKC121-152030-
/O.CON.KTSA.SV.W.0069.000000T0000Z-180515T2030Z/
Pittsburg OK-
310 PM CDT TUE MAY 15 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CDT
FOR SOUTHWESTERN PITTSBURG COUNTY...

At 309 PM CDT, a severe thunderstorm was located over Ashland, 
moving southeast at 5 mph. Other strong to severe storms were 
located over central and southwestern Pittsburg county.

HAZARD...60 mph wind gusts and quarter 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...
Mcalester...                      Hartshorne...
Krebs...                          Kiowa...
Savanna...                        Alderson...
Ashland...                        Mcalester Regional Airport...
Blanco...                         Haileyville...
Pittsburg...                      Dow...
Bache...                          

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3485 9604 3487 9590 3501 9583 3486 9555
      3469 9576 3460 9588 3467 9588 3468 9589
      3468 9609 3481 9609
TIME...MOT...LOC 2009Z 303DEG 6KT 3478 9605 

HAIL...1.00IN
WIND...60MPH
 
$$

Lacy

329 
WWUS54 KTSA 152027
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
327 PM CDT TUE MAY 15 2018

OKC121-152037-
/O.EXP.KTSA.SV.W.0069.000000T0000Z-180515T2030Z/
Pittsburg OK-
327 PM CDT TUE MAY 15 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN PITTSBURG COUNTY
WILL EXPIRE AT 330 PM CDT...
                
The storms which prompted the warning have weakened below severe 
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However small 
hail, gusty winds and heavy rain are still possible with these 
thunderstorms.

LAT...LON 3485 9604 3487 9590 3501 9583 3486 9555
      3469 9576 3460 9588 3467 9588 3468 9589
      3468 9609 3481 9609
TIME...MOT...LOC 2027Z 270DEG 8KT 3475 9603 

$$

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 May 15, 12:18 PM CDT, 2 hours 34 minutes earlier.

Area forecast discussion, May 15, 12:18 PM CDT, 2 hours 34 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
1218 PM CDT Tue May 15 2018

.AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
Mostly VFR conditions expected through the period. Isolated to
widely scattered showers/storms possible later this afternoon
although confidence is too low to include mention in TAF. Better
chances later tonight that another storm complex makes a run
toward eastern OK/northwest AR.

&&

.PREV DISCUSSION... /Issued 1056 AM CDT Tue May 15 2018/

..UPDATE...

DISCUSSION...
Remains of overnight MCS have weakened and shifted east of
the forecast area late this morning. Stronger convection
continues across parts of western/central OK although latest
CAMS guidance is all over the place with the evolution of
this activity into the afternoon hours. Suspect that some
showers/storms will make it into parts of northeast OK along
with other scattered activity along any weak/diffuse leftover
boundaries.

Overall confidence is rather low so have kept general chance
PoPs for most locations. High instability/low shear environment
will favor pulse/multicell storms, along with the possbility of
marginally severe hail/wind.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   66  82  64  86 /  20  30  20  10
FSM   66  84  65  87 /  30  30  20  10
MLC   65  82  64  86 /  20  30  20  10
BVO   63  82  62  86 /  20  30  20  10
FYV   62  79  61  82 /  30  30  20  10
BYV   62  80  61  82 /  30  30  20  10
MKO   65  81  63  85 /  20  30  20  10
MIO   64  81  62  84 /  20  30  20  10
F10   65  81  64  85 /  20  30  20  10
HHW   67  84  65  87 /  20  30  20  10

&&

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

AVIATION.....18

Hazardous weather outlook, May 15, 12:42 PM CDT, 2 hours 10 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
1242 PM CDT Tue May 15 2018

ARZ001-002-010-011-019-020-029-OKZ049-053>076-161015-
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-
1242 PM CDT Tue May 15 2018

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

.DAY ONE...This afternoon and Tonight.

SEVERE THUNDERSTORM.
	RISK...Limited.
	AREA...Eastern Oklahoma and northwest Arkansas.
	ONSET...Mid to late afternoon.

DISCUSSION...
Thunderstorms across parts of central Oklahoma may move into or
develop across parts of eastern Oklahoma and northwest Arkansas
later this afternoon. A few of these storms could become briefly
severe, with large hail and damaging winds being the main threat.

Additional showers and storms will be possible late tonight as well.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Local Spotter Activation May Be Needed.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.
WEDNESDAY...Thunderstorm Potential.
THURSDAY AND FRIDAY...No Hazards.
SATURDAY THROUGH MONDAY...Thunderstorm Potential.

EXTENDED DISCUSSION...
A weak upper level trough and residual boundaries left from
previous convection will maintain thunderstorm chances on
Wednesday. Ridging aloft will bring a return to hot and dry
weather Thursday and Friday. A frontal boundary will bring another
round of thunderstorm potential mainly toward the latter part of
the upcoming weekend.

weather.gov/tulsa contains additional information.

In the hours before

Special weather statement, May 15, 2:13 PM CDT, 39 minutes before

Special Weather Statement
National Weather Service Tulsa OK
213 PM CDT TUE MAY 15 2018

OKZ073-151945-
Pittsburg OK-
213 PM CDT TUE MAY 15 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL PITTSBURG COUNTY
UNTIL 245 PM CDT...

At 213 PM CDT, a strong thunderstorm was located near Stuart, moving
southeast 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...
Mcalester...                      Savanna...
Ashland...                        Haywood...
Mcalester Regional Airport...     Arpelar...

LAT...LON 3501 9609 3506 9604 3491 9575 3468 9604
      3475 9609
TIME...MOT...LOC 1913Z 306DEG 15KT 3491 9606

Lacy

Local storm report, May 15, 2:48 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
248 PM CDT TUE MAY 15 2018

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

0227 PM     HAIL             6 W MCALESTER           34.93N 95.88W
05/15/2018  E1.00 INCH       PITTSBURG          OK   PUBLIC

            NICKEL TO QUARTER SIZE HAIL AND ESTIMATED 50 MPH WINDS.
            REPORT RELAYED THROUGH THE MEDIA

&&

DMJ

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 7:34 PM CDT	Severe Thunderstorm Warning	TSA	Osage	41 min
May 14, 8:10 PM CDT	Severe Thunderstorm Warning	TSA	Osage	50 min
May 14, 8:49 PM CDT	Areal Flood Advisory	TSA	Osage	3 hr
May 14, 8:57 PM CDT	Severe Thunderstorm Warning	TSA	Osage	24 min
May 14, 9:54 PM CDT	Severe Thunderstorm Warning	TSA	Osage	66 min
May 14, 10:27 PM CDT	Flash Flood Warning	TSA	Osage	4 hr
May 14, 10:32 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Washington	58 min
May 14, 11:04 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata, Rogers, Washington	56 min
May 14, 11:54 PM CDT	Special Weather Statement	TSA	Craig, Nowata, Rogers	51 min
May 15, 12:15 AM CDT	Special Weather Statement	TSA	Osage	60 min
May 15, 12:18 AM CDT	Special Weather Statement	TSA	Delaware, Mayes, Ottawa, Rogers	27 min
May 15, 12:38 AM CDT	Severe Thunderstorm Warning	TSA	Osage	37 min
May 15, 12:45 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Mayes, Osage, Rogers, Tulsa, Wagoner and 1 more	45 min
May 15, 1:10 AM CDT	Special Weather Statement	TSA	Washington	35 min
May 15, 1:25 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Mayes, Muskogee, Rogers, Tulsa and 1 more	50 min
May 15, 2:01 AM CDT	Areal Flood Advisory	TSA	Mayes, Rogers, Tulsa, Wagoner	3 hr
May 15, 2:09 AM CDT	Special Weather Statement	TSA	Cherokee, Wagoner	36 min
May 15, 2:23 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Muskogee, Wagoner	42 min
May 15, 2:58 AM CDT	Special Weather Statement	TSA	Muskogee	47 min
May 15, 3:23 AM CDT	Special Weather Statement	TSA	Haskell, McIntosh, Sequoyah	67 min
May 15, 3:51 AM CDT	Special Weather Statement	TSA	LeFlore, Sequoyah	54 min
May 15, 3:52 AM CDT	Special Weather Statement	TSA	Choctaw, Latimer, Pushmataha	68 min
May 15, 2:13 PM CDT	Special Weather Statement	TSA	Pittsburg	32 min
May 15, 2:22 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	38 min
May 15, 3:26 PM CDT	Special Weather Statement	TSA	Pittsburg	49 min
May 15, 3:38 PM CDT	Special Weather Statement	TSA	Pushmataha	37 min
May 15, 3:47 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg, Pushmataha	43 min
May 15, 4:19 PM CDT	Special Weather Statement	TSA	Pushmataha	41 min
May 15, 4:35 PM CDT	Special Weather Statement	TSA	Pushmataha	25 min
May 15, 4:40 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	34 min
May 15, 4:51 PM CDT	Special Weather Statement	TSA	Choctaw	39 min
May 15, 5:17 PM CDT	Special Weather Statement	TSA	Ottawa	43 min
May 15, 5:23 PM CDT	Areal Flood Advisory	TSA	Pushmataha	3 hr
May 15, 5:31 PM CDT	Special Weather Statement	TSA	Choctaw	29 min
May 15, 5:36 PM CDT	Special Weather Statement	TSA	Craig	24 min
May 15, 5:40 PM CDT	Severe Thunderstorm Warning	TSA	Craig	34 min
May 15, 6:16 PM CDT	Special Weather Statement	TSA	Craig	29 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.