Alert archive / Arkansas / Tornado Warnings in 2018

Tornado Warning 5, NWS Tulsa, OK

April 13, 2018Crawford County, Franklin County, Sebastian County, Arkansas; Sequoyah County, Oklahoma

NWS Tulsa, OK issued this tornado warning at Apr 13, 2018, 3:50 PM CDT for Crawford County, Franklin County, Sebastian County, Arkansas; Sequoyah County, Oklahoma. It was in force for 25 min. 3 reports 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
Apr 13, 2018, 3:50 PM CDT (20:50 UTC)
Expired
Apr 13, 2018, 4:15 PM CDT
In force
25 min
Issued by
NWS Tulsa, OK
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.75 in

Counties Crawford County, AR, Franklin County, AR, Sebastian County, AR, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 20 km from the middle of the area, began a volume at 20:51 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
Apr 13, 4:09 PM CDTTSTM WND DMG2 N Alma, ARUPROOTED AND SNAPPED TREES.
Apr 13, 4:14 PM CDTTSTM WND DMGMountainburg, ARROOF PARTIALLY REMOVED FROM HOME ON NORTH SIDE OF TOWN. POWER LINES DOWN ON ALONG HIGHWAY 71.
Apr 13, 4:18 PM CDTTORNADOMountainburg, ARSPRINGDALE ASP ADVISES THAT ONE HOME DAMAGED.

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

The watch it was issued in

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

IssuedProductOfficeLasted
Apr 13, 1:20 PM CDTTornado WatchSPC9 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 8.8 hours before the alert went out and 166 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 2018-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2018-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 572 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1715 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
572 m²/s²
0-3 km storm-relative helicity
541 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

959 
WFUS54 KTSA 132050
TORTSA
ARC033-047-131-OKC135-132115-
/O.NEW.KTSA.TO.W.0005.180413T2050Z-180413T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Tulsa OK
350 PM CDT FRI APR 13 2018

The National Weather Service in Tulsa has issued a

* Tornado Warning for...
  Northwestern Franklin County in west central Arkansas...
  Crawford County in northwestern Arkansas...
  Northwestern Sebastian County in west central Arkansas...
  East central Sequoyah County in east central Oklahoma...

* Until 415 PM CDT
    
* At 350 PM CDT, a severe thunderstorm with strong low level rotation
  that could produce a tornado at any time was located near Van
  Buren, moving northeast at 50 mph.

  HAZARD...Tornado and golf ball size hail. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* Locations in or near the path include...
  Fort Smith...                     Van Buren...
  Cedarville...                     Mountainburg...
  Alma...                           Barling...
  Roland...                         Mulberry...
  Dyer...                           Chester...
  Moffett...                        Rudy...
  Lake Fort Smith...                Figure Five...
  Fort Smith Regional Airport...    Fern...
  Kibler...                         Concord...
  Shibley...                        Mill Creek...

This includes the following highways,
 Interstate 40 in Arkansas between mile markers 0 and 21.
 Interstate 40 in Oklahoma between mile markers 322 and 328.
 Interstate 540 between mile markers 1 and 13.
 Interstate 49 between mile markers 22 and 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3528 9438 3532 9443 3538 9443 3538 9447
      3537 9449 3535 9448 3540 9455 3575 9425
      3575 9413 3576 9412 3564 9394
TIME...MOT...LOC 2050Z 222DEG 43KT 3542 9438 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

69
1 follow-up statement
589 
WWUS54 KTSA 132057
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
357 PM CDT FRI APR 13 2018

ARC131-OKC135-132107-
/O.CAN.KTSA.TO.W.0005.000000T0000Z-180413T2115Z/
Sebastian AR-Sequoyah OK-
357 PM CDT FRI APR 13 2018

...THE TORNADO WARNING FOR NORTHWESTERN SEBASTIAN AND EAST CENTRAL
SEQUOYAH COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. therefore the warning has been cancelled.

A tornado watch remains in effect until 1000 PM CDT for northwestern
and west central Arkansas.

LAT...LON 3540 9431 3547 9441 3575 9425 3575 9413
      3576 9412 3564 9394
TIME...MOT...LOC 2057Z 221DEG 39KT 3547 9433 

$$

ARC033-047-132115-
/O.CON.KTSA.TO.W.0005.000000T0000Z-180413T2115Z/
Franklin AR-Crawford AR-
357 PM CDT FRI APR 13 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM CDT FOR
NORTHWESTERN FRANKLIN AND CENTRAL CRAWFORD COUNTIES...
    
At 357 PM CDT, a severe thunderstorm with strong low level rotation
that could produce a tornado at any time was located near Van Buren,
moving northeast at 45 mph.

HAZARD...Tornado and half dollar size hail. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

Locations in or near the path include...
Van Buren...                      Cedarville...
Mountainburg...                   Alma...
Chester...                        Rudy...
Lake Fort Smith...                Figure Five...
Fern...                           Concord...
Shibley...                        Piney...
Locke...                          Furry...

This includes the following highways,
 Interstate 40 in Arkansas between mile markers 2 and 16.
 Interstate 540 between mile markers 1 and 3.
 Interstate 49 between mile markers 22 and 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3540 9431 3547 9441 3575 9425 3575 9413
      3576 9412 3564 9394
TIME...MOT...LOC 2057Z 221DEG 39KT 3547 9433 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

69

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 13, 3:14 PM CDTSpecial Weather StatementTSABenton46 min
Apr 13, 3:28 PM CDTSpecial Weather StatementTSACrawford47 min
Apr 13, 3:40 PM CDTSevere Thunderstorm WarningTSACrawford, Sebastian50 min
Apr 13, 4:10 PM CDTTornado WarningTSACrawford, Franklin, Madison, Washington50 min
Apr 13, 4:57 PM CDTSevere Thunderstorm WarningTSACarroll, Madison48 min
Apr 13, 5:02 PM CDTTornado WarningTSACarroll, Madison28 min
Apr 13, 5:06 PM CDTSpecial Weather StatementTSASebastian39 min
Apr 13, 5:19 PM CDTSevere Thunderstorm WarningTSACrawford, Franklin, Sebastian41 min
Apr 13, 5:29 PM CDTTornado WarningTSACarroll15 min
Apr 13, 5:48 PM CDTTornado WarningTSAFranklin, Sebastian42 min
Apr 13, 6:02 PM CDTSevere Thunderstorm WarningTSAFranklin, Sebastian28 min
Apr 13, 6:27 PM CDTSevere Thunderstorm WarningTSAFranklin, Sebastian34 min
Apr 13, 2:09 PM CDTSpecial Weather StatementTSAPawnee51 min
Apr 13, 2:18 PM CDTSpecial Weather StatementTSAAdair27 min
Apr 13, 2:30 PM CDTSevere Thunderstorm WarningTSACreek, Osage, Pawnee30 min
Apr 13, 2:38 PM CDTSevere Thunderstorm WarningTSACreek, Okfuskee, Okmulgee52 min
Apr 13, 3:04 PM CDTSpecial Weather StatementTSAWashington41 min
Apr 13, 3:17 PM CDTSevere Thunderstorm WarningTSACreek, Okfuskee, Okmulgee, Osage, Tulsa, Wagoner43 min
Apr 13, 3:34 PM CDTSevere Thunderstorm WarningTSAPittsburg41 min
Apr 13, 3:49 PM CDTSevere Thunderstorm WarningTSANowata, Washington41 min
Apr 13, 3:54 PM CDTSevere Thunderstorm WarningTSAMuskogee, Okmulgee, Rogers, Tulsa, Wagoner37 min
Apr 13, 4:13 PM CDTSevere Thunderstorm WarningTSALatimer, Pittsburg34 min
Apr 13, 4:22 PM CDTSevere Thunderstorm WarningTSACraig, Nowata24 min
Apr 13, 4:52 PM CDTSevere Thunderstorm WarningTSALatimer, Pittsburg, Pushmataha53 min
Apr 13, 4:54 PM CDTSpecial Weather StatementTSACherokee36 min
Apr 13, 5:12 PM CDTSevere Thunderstorm WarningTSAAdair, Cherokee, Delaware33 min
Apr 13, 5:20 PM CDTSevere Thunderstorm WarningTSAChoctaw, Pushmataha40 min
Apr 13, 5:30 PM CDTSevere Thunderstorm WarningTSAHaskell, Latimer, LeFlore, Pushmataha45 min
Apr 13, 5:59 PM CDTSevere Thunderstorm WarningTSAChoctaw, Pushmataha46 min
Apr 13, 6:10 PM CDTTornado WarningTSALeFlore16 min
Apr 13, 6:26 PM CDTSevere Thunderstorm WarningTSALatimer, LeFlore, Pushmataha36 min
Apr 13, 6:44 PM CDTSpecial Weather StatementTSAPushmataha31 min

Nearby

Tornado Warnings in Arkansas, 2018Tornado Warnings in Oklahoma, 2018Every tornado warning in 2018Tornadoes in 2018

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.