Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Norman, OK

March 12, 2021Alfalfa County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 12, 2021, 8:38 AM CST for Alfalfa County, Oklahoma. It was in force for 22 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 12, 2021, 8:38 AM CST (14:38 UTC)
Expired: Mar 12, 2021, 9:00 AM CST
In force: 22 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Alfalfa County, OK

The radar

The Vance AFB radar (KVNX), 26 km from the middle of the area, began a volume at 14:40 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.

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 2.6 hours before the alert went out and 172 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 84 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 419 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

684 
WUUS54 KOUN 121438
SVROUN
OKC003-121500-
/O.NEW.KOUN.SV.W.0008.210312T1438Z-210312T1500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
838 AM CST Fri Mar 12 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northeastern Alfalfa County in northwestern Oklahoma...

* Until 900 AM CST.

* At 837 AM CST, a severe thunderstorm was located 4 miles northeast
  of Burlington, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Burlington, Amorita, Byron, Driftwood and Waldron. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3696 9811 3686 9841 3700 9851 3700 9811
TIME...MOT...LOC 1437Z 247DEG 35KT 3695 9838 

HAIL...1.00IN
WIND...60MPH
 
$$

SIX

2 follow-up statements

523 
WWUS54 KOUN 121443
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
843 AM CST Fri Mar 12 2021

OKC003-121500-
/O.CON.KOUN.SV.W.0008.000000T0000Z-210312T1500Z/
Alfalfa OK-
843 AM CST Fri Mar 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM CST
FOR NORTHEASTERN ALFALFA COUNTY...

At 843 AM CST, a severe thunderstorm was located 4 miles north of
Amorita, moving northeast at 45 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Burlington, Amorita, Byron, Driftwood and Waldron. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3696 9811 3686 9841 3700 9851 3700 9811
TIME...MOT...LOC 1443Z 244DEG 38KT 3699 9829 

HAIL...1.50IN
WIND...60MPH
 
$$

SIX

664 
WWUS54 KOUN 121453
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
853 AM CST Fri Mar 12 2021

OKC003-121500-
/O.CON.KOUN.SV.W.0008.000000T0000Z-210312T1500Z/
Alfalfa OK-
853 AM CST Fri Mar 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM CST
FOR NORTHEASTERN ALFALFA COUNTY...

At 851 AM CST, a severe thunderstorm was located 8 miles northeast 
of Amorita, moving northeast at 40 to 45 mph. This storm will move 
into southern Kansas by 9 am. 

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Waldron.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3696 9811 3692 9823 3700 9830 3700 9811
TIME...MOT...LOC 1451Z 247DEG 35KT 3702 9819 

HAIL...1.00IN
WIND...60MPH
 
$$

SIX

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 12, 8:05 AM CST	Special Weather Statement	OUN	Woods	25 min
Mar 12, 8:27 AM CST	Special Weather Statement	OUN	Alfalfa	18 min
Mar 12, 8:50 AM CST	Special Weather Statement	OUN	Woods	25 min
Mar 12, 2:06 PM CST	Flood Watch	OUN	Canadian, Garfield, Grant, Kay, Kingfisher, Lincoln and 4 more	16 hr
Mar 12, 4:57 PM CST	Special Weather Statement	OUN	Beckham	33 min
Mar 12, 5:14 PM CST	Special Weather Statement	OUN	Beckham	31 min
Mar 12, 5:20 PM CST	Special Weather Statement	OUN	Roger Mills	25 min
Mar 12, 5:30 PM CST	Severe Thunderstorm Warning	OUN	Beckham	45 min
Mar 12, 5:37 PM CST	Special Weather Statement	OUN	Custer	38 min
Mar 12, 5:50 PM CST	Special Weather Statement	OUN	Custer	25 min
Mar 12, 5:55 PM CST	Severe Thunderstorm Warning	OUN	Beckham, Washita	37 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021 Every severe thunderstorm warning 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.