Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 239, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Aug 19, 2012, 3:57 PM CDT for Sequoyah County, Oklahoma. It was in force for 33 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 19, 2012, 3:57 PM CDT (20:57 UTC)
- Expired
- Aug 19, 2012, 4:30 PM CDT
- In force
- 33 min
- Issued by
- NWS Tulsa, OK
- Area
- Storm-based polygon
County Sequoyah County, OK
The radar
The Western Arkansas radar (KSRX), 38 km from the middle of the area, began a volume at 20:57 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 nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 9.0 hours before the alert went out and 170 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.
- Mixed-layer CAPE
- 478 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 975 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
104 WUUS54 KTSA 192057 SVRTSA OKC135-192130- /O.NEW.KTSA.SV.W.0239.120819T2057Z-120819T2130Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 357 PM CDT SUN AUG 19 2012 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA * UNTIL 430 PM CDT * AT 353 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 3 MILES NORTH OF BRUSHY...MOVING SOUTH AT 5 MPH. STORM HAZARDS INCLUDE... WIND GUSTS TO 60 MPH... * SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...BRUSHY. 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 3547 9452 3547 9482 3564 9479 3564 9460 TIME...MOT...LOC 2057Z 345DEG 4KT 3559 9472 $$
2 follow-up statements
941 WWUS54 KTSA 192114 SVSTSA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 414 PM CDT SUN AUG 19 2012 OKC135-192130- /O.CON.KTSA.SV.W.0239.000000T0000Z-120819T2130Z/ SEQUOYAH OK- 414 PM CDT SUN AUG 19 2012 ...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR CENTRAL SEQUOYAH COUNTY... AT 410 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR BRUSHY... MOVING SOUTH AT 5 MPH. STORM HAZARDS INCLUDE... WIND GUSTS TO 60 MPH... THIS STORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS ALSO OCCURRING WITH THIS STORM. LIGHTNING IS ONE OF NATURES MOST SIGNIFICANT KILLERS. REMAIN INDOORS AND AWAY FROM WINDOWS. DO NOT USE ELECTRICAL EQUIPMENT OR TAKE A BATH OR SHOWER DURING A STORM. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. && LAT...LON 3561 9479 3561 9459 3547 9452 3547 9482 TIME...MOT...LOC 2114Z 345DEG 4KT 3556 9467 $$
236 WWUS54 KTSA 192127 SVSTSA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TULSA OK 427 PM CDT SUN AUG 19 2012 OKC135-192137- /O.EXP.KTSA.SV.W.0239.000000T0000Z-120819T2130Z/ SEQUOYAH OK- 427 PM CDT SUN AUG 19 2012 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SEQUOYAH COUNTY EXPIRES AT 430 PM CDT... THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS...THEREFORE THE SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE. GUSTY WINDS TO 40 MPH AND VERY HEAVY RAIN WILL STILL BE POSSIBLE WITH THIS STORM AS IT MOVES ACROSS EASTERN SEQUOYAH COUNTY. LAT...LON 3561 9479 3561 9459 3547 9452 3547 9482 TIME...MOT...LOC 2127Z 345DEG 4KT 3555 9467 $$
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 2:33 PM CDT | Special Weather Statement | TSA | Cherokee | 27 min |
| Aug 19, 2:57 PM CDT | Special Weather Statement | TSA | Adair, Cherokee | 33 min |
| Aug 19, 3:21 PM CDT | Special Weather Statement | TSA | Adair, Cherokee | 24 min |
| Aug 19, 3:30 PM CDT | Special Weather Statement | TSA | Sequoyah | 30 min |
| Aug 19, 3:43 PM CDT | Special Weather Statement | TSA | Wagoner | 32 min |
| Aug 19, 4:26 PM CDT | Special Weather Statement | TSA | Sequoyah | 34 min |
| Aug 19, 5:43 PM CDT | Special Weather Statement | TSA | Haskell | 32 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2012Every severe thunderstorm warning in 2012
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.