Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 239, NWS Tulsa, OK

May 1, 2011Cherokee County, Delaware County, Mayes County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 1, 2011, 4:04 PM CDT for Cherokee County, Delaware County, Mayes County, Oklahoma. It was in force for 26 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: May 1, 2011, 4:04 PM CDT (21:04 UTC)
Expired: May 1, 2011, 4:30 PM CDT
In force: 26 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Cherokee County, OK, Delaware County, OK, Mayes County, OK

The radar

The Tulsa radar (KINX), 65 km from the middle of the area, began a volume at 21:04 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
May 1, 4:04 PM CDT	HAIL 1	Locust Grove, OK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.1 hours before the alert went out and 112 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: 2708 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: -107 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

641 
WUUS54 KTSA 012104
SVRTSA
OKC021-041-097-012130-
/O.NEW.KTSA.SV.W.0239.110501T2104Z-110501T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
404 PM CDT SUN MAY 1 2011

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN CHEROKEE COUNTY IN EAST CENTRAL OKLAHOMA
  DELAWARE COUNTY IN NORTHEAST OKLAHOMA
  EASTERN MAYES COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 430 PM CDT

* AT 400 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR LOCUST
  GROVE...MOVING NORTHEAST AT 60 MPH.

  STORM HAZARDS INCLUDE...
  HALF DOLLAR SIZE HAIL...

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...LEACH...
  SPAVINAW...LANGLEY...CHLOETA...DISNEY...JAY...CLEORA...BERNICE AND
  MAYSVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3642 9460 3640 9460 3606 9506 3624 9526
      3652 9504 3652 9501 3655 9502 3666 9492
TIME...MOT...LOC 2104Z 224DEG 52KT 3625 9510

$$

2 follow-up statements

617 
WWUS54 KTSA 012115
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
415 PM CDT SUN MAY 1 2011

OKC021-097-012125-
/O.CAN.KTSA.SV.W.0239.000000T0000Z-110501T2130Z/
CHEROKEE OK-MAYES OK-
415 PM CDT SUN MAY 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MAYES AND NORTHERN
CHEROKEE COUNTIES IS CANCELLED...

LAT...LON 3642 9460 3640 9460 3617 9498 3632 9501
      3655 9502 3666 9492
TIME...MOT...LOC 2115Z 224DEG 52KT 3641 9497 3639 9486
          3631 9483

$$

OKC041-012130-
/O.CON.KTSA.SV.W.0239.000000T0000Z-110501T2130Z/
DELAWARE OK-
415 PM CDT SUN MAY 1 2011

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR
DELAWARE COUNTY...

AT 413 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM CHLOETA TO 6 MILES SOUTHEAST OF CHLOETA TO 10 MILES
SOUTH OF JAY...MOVING NORTHEAST AT 60 MPH.

THESE STORMS PRODUCED QUARTER SIZE HAIL IN LOCUST GROVE.  THE STORMS
HAVE WEAKENED SLIGHTLY SINCE THEN... BUT COULD REINTENSIFY.  

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...CHLOETA...
DISNEY...JAY...ZENA...CLEORA AND BERNICE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3642 9460 3640 9460 3617 9498 3632 9501
      3655 9502 3666 9492
TIME...MOT...LOC 2115Z 224DEG 52KT 3641 9497 3639 9486
          3631 9483

$$

492 
WWUS54 KTSA 012124
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
424 PM CDT SUN MAY 1 2011

OKC041-012134-
/O.EXP.KTSA.SV.W.0239.000000T0000Z-110501T2130Z/
DELAWARE OK-
424 PM CDT SUN MAY 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR DELAWARE COUNTY EXPIRES AT 430
PM CDT...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS...THEREFORE THE
SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 3642 9460 3640 9460 3617 9498 3632 9501
      3655 9502 3666 9492
TIME...MOT...LOC 2124Z 224DEG 52KT 3650 9485 3648 9474
          3640 9471

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 7:01 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw	44 min
May 1, 7:14 AM CDT	Special Weather Statement	TSA	Pushmataha	31 min
May 1, 7:35 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	55 min
May 1, 8:28 AM CDT	Special Weather Statement	TSA	Latimer	47 min
May 1, 8:38 AM CDT	Special Weather Statement	TSA	Choctaw	67 min
May 1, 9:11 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw	26 min
May 1, 9:36 AM CDT	Special Weather Statement	TSA	Pushmataha	24 min
May 1, 11:58 AM CDT	Areal Flood Warning	TSA	Adair, Cherokee	24 hr
May 1, 1:54 PM CDT	Special Weather Statement	TSA	Pushmataha	66 min
May 1, 2:43 PM CDT	Severe Thunderstorm Warning	TSA	Latimer	32 min
May 1, 3:04 PM CDT	Special Weather Statement	TSA	Latimer	26 min
May 1, 3:17 PM CDT	Areal Flood Advisory	TSA	Latimer, Pittsburg, Pushmataha	88 min
May 1, 3:28 PM CDT	Special Weather Statement	TSA	LeFlore	32 min
May 1, 3:44 PM CDT	Special Weather Statement	TSA	Mayes, Wagoner	31 min
May 1, 3:47 PM CDT	Special Weather Statement	TSA	Wagoner	28 min
May 1, 4:27 PM CDT	Special Weather Statement	TSA	Latimer	33 min
May 1, 4:40 PM CDT	Areal Flood Advisory	TSA	Haskell, Latimer, LeFlore, Pittsburg, Pushmataha, Sequoyah	110 min
May 1, 5:37 PM CDT	Areal Flood Advisory	TSA	LeFlore, Sequoyah	53 min
May 1, 6:13 PM CDT	Flash Flood Warning	TSA	Adair, Cherokee, Haskell, Latimer, LeFlore, Pittsburg and 2 more	6 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2011 Every severe thunderstorm warning in 2011

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.