Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 521, NWS Tulsa, OK

August 20, 2011Franklin County, Arkansas

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

TimeReportWhereRemark
Aug 20, 6:16 PM CDTTSTM WND DMG4 Wsw Ozark, ARLARGE 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.

Skew-T log-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2011-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3504 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2011-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
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

Open this sounding in Storm Lab

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.

IssuedProductOfficeCountiesLasted
Aug 20, 3:36 PM CDTHeat AdvisoryTSA28 hr
Aug 20, 5:29 PM CDTSpecial Weather StatementTSASebastian31 min
Aug 20, 5:46 PM CDTSpecial Weather StatementTSAFranklin29 min
Aug 20, 6:11 PM CDTSevere Thunderstorm WarningTSAFranklin49 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.