Alert archive / Oklahoma / Tornado Warnings in 2021

Tornado Warning 3, NWS Norman, OK

March 13, 2021Hardeman County, Texas; Harmon County, Jackson County, Oklahoma

NWS Norman, OK issued this tornado warning at Mar 13, 2021, 8:05 PM CST for Hardeman County, Texas; Harmon County, Jackson County, Oklahoma. It was in force for 25 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: Mar 13, 2021, 8:05 PM CST (02:05 UTC)
Expired: Mar 13, 2021, 8:30 PM CST
In force: 25 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

Counties Harmon County, OK, Jackson County, OK, Hardeman County, TX

The radar

The Altus AFB radar (KFDR), 75 km from the middle of the area, began a volume at 02:03 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

Norman, OK (KOUN), launched 00:00Z, 2.1 hours before the alert went out and 233 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 217 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

367 
WFUS54 KOUN 140205
TOROUN
OKC057-065-TXC197-140230-
/O.NEW.KOUN.TO.W.0003.210314T0205Z-210314T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Norman OK
805 PM CST Sat Mar 13 2021

The National Weather Service in Norman has issued a

* Tornado Warning for...
  Southwestern Jackson County in southwestern Oklahoma...
  Southeastern Harmon County in southwestern Oklahoma...
  Northwestern Hardeman County in northern Texas...

* Until 830 PM CST.
    
* At 805 PM CST, a severe thunderstorm capable of producing a tornado
  was located 5 miles north of Goodlett, moving northeast at 40 mph.

  HAZARD...Tornado and ping pong 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 impacted include...
  Eldorado.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a storm shelter, safe room 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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 3437 9985 3439 9994 3460 9984 3462 9962
      3448 9959
TIME...MOT...LOC 0205Z 222DEG 34KT 3441 9985 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

Mahale

2 follow-up statements

647 
WWUS54 KOUN 140218
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
818 PM CST Sat Mar 13 2021

OKC057-065-TXC197-140230-
/O.CON.KOUN.TO.W.0003.000000T0000Z-210314T0230Z/
Jackson OK-Harmon OK-Hardeman TX-
818 PM CST Sat Mar 13 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CST FOR
SOUTHWESTERN JACKSON...SOUTHEASTERN HARMON AND NORTHWESTERN HARDEMAN
COUNTIES...
    
At 817 PM CST, a severe thunderstorm capable of producing a tornado 
was located 6 miles west of Eldorado, moving northeast at 40 mph. 
Another circulation was located about 5 miles to the west of this 
circulation. 

HAZARD...Tornado and quarter 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 impacted include...
Eldorado.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a storm shelter, safe room, 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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 3442 9973 3445 9991 3460 9984 3462 9962
      3448 9959
TIME...MOT...LOC 0217Z 221DEG 34KT 3450 9976 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Mahale

916 
WWUS54 KOUN 140228
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
828 PM CST Sat Mar 13 2021

OKC057-065-TXC197-140238-
/O.EXP.KOUN.TO.W.0003.000000T0000Z-210314T0230Z/
Jackson OK-Harmon OK-Hardeman TX-
828 PM CST Sat Mar 13 2021

...THE TORNADO WARNING FOR SOUTHWESTERN JACKSON...SOUTHEASTERN HARMON
AND NORTHWESTERN HARDEMAN COUNTIES WILL EXPIRE AT 830 PM CST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However small hail
and heavy rain are still possible with this thunderstorm.

LAT...LON 3442 9973 3445 9991 3460 9984 3462 9962
      3448 9959
TIME...MOT...LOC 0228Z 222DEG 34KT 3458 9968 

$$

Mahale

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 13, 7:17 PM CST	Severe Thunderstorm Warning	OUN	Foard, Hardeman	43 min
Mar 13, 7:32 PM CST	Tornado Warning	OUN	Foard, Hardeman	28 min
Mar 13, 7:57 PM CST	Tornado Warning	OUN	Hardeman	18 min
Mar 13, 8:02 PM CST	Severe Thunderstorm Warning	OUN	Hardeman	28 min
Mar 13, 8:42 PM CST	Special Weather Statement	OUN	Knox	48 min
Mar 13, 9:26 PM CST	Special Weather Statement	OUN	Baylor, Knox	49 min
Mar 13, 10:52 PM CST	Special Weather Statement	OUN	Archer	38 min
Mar 13, 8:31 PM CST	Special Weather Statement	OUN	Harmon	29 min
Mar 13, 8:33 PM CST	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	42 min
Mar 13, 9:11 PM CST	Severe Thunderstorm Warning	OUN	Ellis	49 min
Mar 13, 9:16 PM CST	Special Weather Statement	OUN	Greer	29 min
Mar 13, 9:46 PM CST	Special Weather Statement	OUN	Beckham	29 min
Mar 13, 9:52 PM CST	Special Weather Statement	OUN	Harper	23 min
Mar 13, 10:14 PM CST	Special Weather Statement	OUN	Harper	46 min
Mar 13, 10:15 PM CST	Special Weather Statement	OUN	Roger Mills	45 min

Nearby

Tornado Warnings in Oklahoma, 2021 Tornado Warnings in Texas, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.