Alert archive / Oklahoma / Tornado Warnings in 2013

Tornado Warning 39, NWS Norman, OK

May 20, 2013Atoka County, Coal County, Johnston County, Oklahoma

NWS Norman, OK issued this tornado warning at May 20, 2013, 6:37 PM CDT for Atoka County, Coal County, Johnston County, Oklahoma. It was in force for 23 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
May 20, 2013, 6:37 PM CDT (23:37 UTC)
Expired
May 20, 2013, 7:00 PM CDT
In force
23 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Atoka County, OK, Coal County, OK, Johnston County, OK

The radar

The Norman radar (KTLX), 134 km from the middle of the area, began a volume at 23:40 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
May 20, 6:39 PM CDTTSTM WND GST 802 Wnw Wapanucka, OKSPOTTER REPORTED TREE BRANCHES DOWN IN AREA

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
May 20, 1:10 PM CDTTornado WatchSPC9 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.6 hours before the alert went out and 134 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, Norman, OK at 12:00Z on 2013-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2243 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, Norman, OK at 12:00Z on 2013-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 298 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
2243 J/kg
Mixed-layer CIN
-192 J/kg
Mixed-layer LCL
830 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
298 m²/s²
0-3 km storm-relative helicity
297 m²/s²
Significant tornado parameter
0.0
Supercell composite
14.5

Open this sounding in Storm Lab

The text

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

389 
WFUS54 KOUN 202337
TOROUN
OKC005-029-069-210000-
/O.NEW.KOUN.TO.W.0039.130520T2337Z-130521T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
637 PM CDT MON MAY 20 2013

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN COAL COUNTY IN SOUTHEAST OKLAHOMA...
  CENTRAL ATOKA COUNTY IN SOUTHEAST OKLAHOMA...
  NORTHEASTERN JOHNSTON COUNTY IN SOUTHEAST OKLAHOMA...

* UNTIL 700 PM CDT
    
* AT 635 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR WAPANUCKA...AND MOVING NORTHEAST AT 60 MPH.

IN ADDITION TO A TORNADO...LARGE DAMAGING HAIL UP TO TWO INCHES IN
DIAMETER IS EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  ATOKA...COALGATE...WAPANUCKA...STRINGTOWN...LEHIGH...BROMIDE...
  PHILLIPS...WARDVILLE...CLARITA...OLNEY...CONNERVILLE...CHOCKIE...
  REDDEN...BOGGY DEPOT STATE PARK AND ATOKA RESERVOIR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW IN A STORM SHELTER OR AN INTERIOR ROOM OF A STURDY
BUILDING. STAY AWAY FROM DOORS AND WINDOWS.

&&

LAT...LON 3427 9657 3443 9668 3468 9609 3468 9592
      3441 9578
TIME...MOT...LOC 2337Z 243DEG 52KT 3439 9646 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 7:17 PM CDTSpecial Weather StatementOUNKay43 min
May 19, 7:26 PM CDTSevere Thunderstorm WarningOUNLincoln34 min
May 19, 7:29 PM CDTSevere Thunderstorm WarningOUNKay46 min
May 19, 8:14 PM CDTSevere Thunderstorm WarningOUNKay16 min
May 19, 8:30 PM CDTSpecial Weather StatementOUNNoble30 min
May 19, 9:00 PM CDTSpecial Weather StatementOUNNoble30 min
May 19, 9:33 PM CDTSevere Thunderstorm WarningOUNNoble27 min
May 20, 1:34 PM CDTSpecial Weather StatementOUNStephens26 min
May 20, 1:49 PM CDTSpecial Weather StatementOUNStephens26 min
May 20, 2:00 PM CDTSevere Thunderstorm WarningOUNGarvin, Grady, McClain60 min
May 20, 2:01 PM CDTSevere Thunderstorm WarningOUNComanche, Grady, Stephens59 min
May 20, 2:12 PM CDTSevere Thunderstorm WarningOUNCanadian, Cleveland, Grady, McClain, Oklahoma48 min
May 20, 2:18 PM CDTSevere Thunderstorm WarningOUNCanadian, Logan, Oklahoma42 min
May 20, 2:20 PM CDTSpecial Weather StatementOUNCotton40 min
May 20, 2:22 PM CDTSevere Thunderstorm WarningOUNCotton53 min
May 20, 2:39 PM CDTSevere Thunderstorm WarningOUNCotton, Jefferson, Stephens66 min
May 20, 2:40 PM CDTTornado WarningOUNCleveland, Grady, McClain, Oklahoma35 min
May 20, 2:42 PM CDTTornado WarningOUNCarter, Garvin, Grady, Stephens33 min
May 20, 3:01 PM CDTTornado Warning EmergencyOUNCleveland, McClain, Oklahoma44 min
May 20, 3:07 PM CDTSevere Thunderstorm WarningOUNCotton, Jefferson, Stephens53 min
May 20, 3:11 PM CDTTornado WarningOUNCarter, Garvin, Grady, Stephens64 min
May 20, 3:21 PM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Payne39 min
May 20, 3:26 PM CDTTornado WarningOUNCotton, Jefferson64 min
May 20, 3:40 PM CDTTornado WarningOUNCleveland, Lincoln, Oklahoma, Pottawatomie35 min
May 20, 3:58 PM CDTTornado WarningOUNGarvin, Stephens62 min
May 20, 3:59 PM CDTSevere Thunderstorm WarningOUNCleveland, Lincoln, Oklahoma46 min
May 20, 4:10 PM CDTTornado WarningOUNLincoln35 min
May 20, 4:14 PM CDTTornado WarningOUNJefferson61 min
May 20, 4:36 PM CDTTornado WarningOUNGarvin, McClain, Pottawatomie39 min
May 20, 4:42 PM CDTTornado WarningOUNLincoln33 min
May 20, 4:43 PM CDTSpecial Weather StatementOUNMcClain32 min
May 20, 4:49 PM CDTSevere Thunderstorm WarningOUNCleveland, Grady, McClain56 min
May 20, 4:58 PM CDTTornado WarningOUNCarter, Jefferson, Love62 min
May 20, 5:00 PM CDTSevere Thunderstorm WarningOUNHughes30 min
May 20, 5:05 PM CDTSevere Thunderstorm WarningOUNGarvin, Hughes, McClain, Pontotoc, Pottawatomie, Seminole55 min
May 20, 5:06 PM CDTTornado WarningOUNJefferson39 min
May 20, 5:14 PM CDTSevere Thunderstorm WarningOUNJefferson, Stephens46 min
May 20, 5:16 PM CDTSevere Thunderstorm WarningOUNLogan, Noble, Payne44 min
May 20, 5:30 PM CDTSevere Thunderstorm WarningOUNCarter, Johnston, Murray60 min
May 20, 5:39 PM CDTTornado WarningOUNJefferson36 min
May 20, 5:52 PM CDTSevere Thunderstorm WarningOUNCarter, Jefferson, Love38 min
May 20, 5:57 PM CDTTornado WarningOUNCarter, Johnston, Marshall48 min
May 20, 6:08 PM CDTSevere Thunderstorm WarningOUNCoal, Johnston, Murray, Pontotoc67 min
May 20, 6:12 PM CDTAreal Flood AdvisoryOUNCotton, Jefferson3 hr
May 20, 6:36 PM CDTSevere Thunderstorm WarningOUNJefferson, Love39 min
May 20, 6:40 PM CDTSevere Thunderstorm WarningOUNAtoka, Johnston65 min
May 20, 6:40 PM CDTSevere Thunderstorm WarningOUNCarter, Love, Marshall50 min
May 20, 6:44 PM CDTSpecial Weather StatementOUNOklahoma46 min
May 20, 6:47 PM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Oklahoma43 min
May 20, 6:54 PM CDTTornado WarningOUNAtoka, Coal, Johnston36 min

Nearby

Tornado Warnings in Oklahoma, 2013Every tornado warning in 2013Tornadoes in 2013

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.