Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 521, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Aug 20, 2011, 5:58 PM CDT for Franklin County, Arkansas. It was in force for 47 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
- Aug 20, 2011, 5:58 PM CDT (22:58 UTC)
- Expired
- Aug 20, 2011, 6:45 PM CDT
- In force
- 47 min
- Issued by
- NWS Tulsa, OK
- Area
- Storm-based polygon
County Franklin County, AR
The radar
The Western Arkansas radar (KSRX), 44 km from the middle of the area, began a volume at 22:59 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 |
|---|---|---|---|
| Aug 20, 6:16 PM CDT | TSTM WND DMG | 4 Wsw Ozark, AR | LARGE TREES DOWN BETWEEN OZARK AND PLEASANT VIEW...SOUTH OF HIGHWAY 64. |
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, 11.0 hours before the alert went out and 163 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
- 3504 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 518 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 2.2
- Supercell composite
- 14.7
The text
As transmitted, in the capitals the NWS used until 2016.
040
WUUS54 KTSA 202258
SVRTSA
ARC047-202345-
/O.NEW.KTSA.SV.W.0521.110820T2258Z-110820T2345Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
558 PM CDT SAT AUG 20 2011
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL FRANKLIN COUNTY IN WEST CENTRAL ARKANSAS
* UNTIL 645 PM CDT
* AT 554 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 11 MILES WEST OF OZARK TO 13 MILES SOUTHWEST OF
OZARK...MOVING EAST AT 30 MPH.
STORM HAZARDS INCLUDE...
QUARTER SIZE HAIL...
WIND GUSTS TO 60 MPH...
* SOME LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
OZARK...WIEDERKEHR VILLAGE...ALTUS AND DENNING.
THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 25 AND 43.
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 3537 9372 3537 9377 3540 9380 3537 9381
3537 9407 3543 9407 3545 9406 3546 9403
3548 9405 3551 9403 3556 9402 3552 9371
TIME...MOT...LOC 2258Z 258DEG 24KT 3550 9400 3547 9399
3540 9399
$$3 follow-up statements
292
WWUS54 KTSA 202314
SVSTSA
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
614 PM CDT SAT AUG 20 2011
ARC047-202345-
/O.CON.KTSA.SV.W.0521.000000T0000Z-110820T2345Z/
FRANKLIN AR-
614 PM CDT SAT AUG 20 2011
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
CENTRAL FRANKLIN COUNTY...
AT 613 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM LONELM TO OZARK TO CECIL...MOVING EAST AT 25 MPH.
STORM HAZARDS INCLUDE...
WIND GUSTS TO 60 MPH...
SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...OZARK...
DENNING...ALTUS AND WIEDERKEHR VILLAGE.
THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 25 AND 42.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
&&
LAT...LON 3538 9377 3540 9380 3544 9378 3542 9404
3545 9406 3546 9403 3547 9403 3548 9405
3551 9403 3556 9402 3552 9371
TIME...MOT...LOC 2315Z 250DEG 21KT 3556 9387 3551 9387
3544 9387
$$884
WWUS54 KTSA 202330
SVSTSA
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
630 PM CDT SAT AUG 20 2011
ARC047-202345-
/O.CON.KTSA.SV.W.0521.000000T0000Z-110820T2345Z/
FRANKLIN AR-
630 PM CDT SAT AUG 20 2011
...SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT FOR
EASTERN FRANKLIN COUNTY...
AT 626 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM OZARK TO WIEDERKEHR VILLAGE TO ALTUS...MOVING EAST AT
25 MPH.
STORM HAZARDS INCLUDE...
WIND GUSTS TO 60 MPH...
.
THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 35 AND 42.
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 3543 9375 3543 9378 3544 9378 3544 9379
3545 9382 3549 9388 3554 9384 3552 9371
TIME...MOT...LOC 2330Z 250DEG 21KT 3554 9378 3552 9369
3546 9372
$$445
WWUS54 KTSA 202344
SVSTSA
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
644 PM CDT SAT AUG 20 2011
ARC047-202355-
/O.EXP.KTSA.SV.W.0521.000000T0000Z-110820T2345Z/
FRANKLIN AR-
644 PM CDT SAT AUG 20 2011
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN FRANKLIN COUNTY
EXPIRES AT 645 PM CDT...
THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS...THEREFORE THE
SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE.
GUSTY WINDS AND HEAVY RAIN WILL STILL BE POSSIBLE WITH THIS STORM.
LAT...LON 3543 9375 3543 9378 3544 9378 3544 9379
3545 9382 3549 9388 3554 9384 3552 9371
TIME...MOT...LOC 2345Z 250DEG 21KT 3557 9368 3555 9359
3549 9362
$$The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 3:36 PM CDT | Heat Advisory | TSA | 28 hr | |
| Aug 20, 5:29 PM CDT | Special Weather Statement | TSA | Sebastian | 31 min |
| Aug 20, 5:46 PM CDT | Special Weather Statement | TSA | Franklin | 29 min |
| Aug 20, 6:11 PM CDT | Severe Thunderstorm Warning | TSA | Franklin | 49 min |
Nearby
Severe Thunderstorm Warnings in Arkansas, 2011Every 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.