Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 310, NWS Tulsa, OK

May 21, 2011Creek County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 21, 2011, 7:54 PM CDT for Creek County, Oklahoma. It was in force for 22 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 21, 2011, 7:54 PM CDT (00:54 UTC)
Expired: May 21, 2011, 8:16 PM CDT
In force: 22 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

County Creek County, OK

The radar

The Norman radar (KTLX), 90 km from the middle of the area, began a volume at 00:57 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 21, 7:08 PM CDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.9 hours before the alert went out and 107 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: 1388 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 2020 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.5

Open this sounding in Storm Lab

The text

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

324 
WUUS54 KTSA 220054
SVRTSA
OKC037-220145-
/O.NEW.KTSA.SV.W.0310.110522T0054Z-110522T0145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
754 PM CDT SAT MAY 21 2011

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN CREEK COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 845 PM CDT

* AT 750 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 5 MILES SOUTHWEST
  OF DEPEW...MOVING NORTHEAST AT 25 MPH.

  STORM HAZARDS INCLUDE...
  QUARTER SIZE HAIL...
  WIND GUSTS TO 60 MPH...

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...DEPEW
  AND BRISTOW.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 181 AND 196.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. IF YOU ARE NEAR THE PATH
OF THIS STORM...BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS.
TAKE COVER ON THE LOWEST FLOOR IN AN INTERIOR ROOM AND STAY AWAY FROM
WINDOWS.

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

&&

LAT...LON 3596 9640 3581 9620 3567 9658 3573 9663
      3574 9662
TIME...MOT...LOC 0054Z 221DEG 21KT 3575 9653

$$

2 follow-up statements

791 
WWUS54 KTSA 220106
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
806 PM CDT SAT MAY 21 2011

OKC037-220145-
/O.CON.KTSA.SV.W.0310.000000T0000Z-110522T0145Z/
CREEK OK-
806 PM CDT SAT MAY 21 2011

...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR
SOUTHERN CREEK COUNTY...

AT 803 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR DEPEW...MOVING
NORTHEAST AT 25 MPH.

STORM HAZARDS INCLUDE...
WIND GUSTS TO 60 MPH...

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...BRISTOW.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 183 AND 196.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. IF YOU ARE NEAR THE PATH
OF THIS STORM...YOU SHOULD BE ALERT FOR RAPIDLY CHANGING WEATHER
CONDITIONS AND BE READY TO ACT QUICKLY.

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

&&

LAT...LON 3577 9658 3577 9659 3596 9640 3581 9620
      3571 9646
TIME...MOT...LOC 0106Z 232DEG 22KT 3578 9646

$$

704 
WWUS54 KTSA 220116
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
816 PM CDT SAT MAY 21 2011

OKC037-220126-
/O.CAN.KTSA.SV.W.0310.000000T0000Z-110522T0145Z/
CREEK OK-
816 PM CDT SAT MAY 21 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CREEK COUNTY IS
CANCELLED...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS...THEREFORE THE
SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED.

GUSTY WINDS TO 40 MPH...SMALL PENNY SIZE HAIL AND BRIEF HEAVY RAIN 
WILL STILL BE POSSIBLE WITH THIS STORM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT.

LAT...LON 3577 9658 3577 9659 3596 9640 3581 9620
      3571 9646
TIME...MOT...LOC 0116Z 232DEG 22KT 3582 9640

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 7:46 PM CDT	Special Weather Statement	TSA	Creek	29 min
May 21, 7:58 PM CDT	Special Weather Statement	TSA	Okfuskee	32 min
May 21, 8:28 PM CDT	Special Weather Statement	TSA	Creek	32 min
May 21, 8:36 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee, Tulsa	39 min
May 21, 9:02 PM CDT	Special Weather Statement	TSA	Tulsa	28 min
May 22, 5:17 PM CDT	Special Weather Statement	TSA	Ottawa	28 min
May 22, 5:46 PM CDT	Severe Thunderstorm Warning	TSA	Ottawa	59 min
May 22, 5:51 PM CDT	Special Weather Statement	TSA	Wagoner	24 min
May 22, 5:54 PM CDT	Special Weather Statement	TSA	Craig	36 min
May 22, 5:59 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes, Ottawa	61 min
May 22, 6:03 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Mayes, Wagoner	57 min
May 22, 6:24 PM CDT	Tornado Warning	TSA	Craig, Delaware, Ottawa	36 min
May 22, 6:42 PM CDT	Tornado Warning	TSA	Cherokee, Delaware, Mayes, Wagoner	33 min
May 22, 6:47 PM CDT	Special Weather Statement	TSA	Okfuskee	28 min
May 22, 6:52 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee, Okmulgee	38 min
May 22, 6:55 PM CDT	Tornado Warning	TSA	Delaware	65 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.