Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

April 13, 2021Archer County, Texas

NWS Norman, OK issued this special weather statement at Apr 13, 2021, 12:07 AM CDT for Archer County, Texas. It was in force for 23 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: Apr 13, 2021, 12:07 AM CDT (05:07 UTC)
Expired: Apr 13, 2021, 12:30 AM CDT
In force: 23 min
Issued by: NWS Norman, OK

County Archer County, TX

The radar

The Altus AFB radar (KFDR), 102 km from the middle of the area, began a volume at 05:09 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

Fort Worth, TX (KFWD), launched 00:00Z, 5.1 hours before the alert went out and 137 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: 1192 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1812 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this special weather statement went out at Apr 12, 10:39 PM CDT, 1 hour 28 minutes earlier.

Area forecast discussion, Apr 12, 10:39 PM CDT, 1 hour 28 minutes before

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Hazardous weather outlook, Apr 12, 12:34 PM CDT, 11 hours 33 minutes before

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In the hours before

Special weather statement, Apr 13, 12:07 AM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 4:08 AM CDT	Special Weather Statement	OUN	Atoka	37 min
Apr 13, 3:57 PM CDT	Special Weather Statement	OUN	Jackson	33 min
Apr 13, 5:32 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	28 min
Apr 13, 5:40 PM CDT	Special Weather Statement	OUN	Comanche	35 min
Apr 13, 5:41 PM CDT	Special Weather Statement	OUN	Tillman	34 min
Apr 13, 6:08 PM CDT	Special Weather Statement	OUN	Jackson	37 min
Apr 13, 6:17 PM CDT	Special Weather Statement	OUN	Grady	28 min
Apr 13, 6:36 PM CDT	Special Weather Statement	OUN	Tillman	24 min
Apr 13, 12:33 AM CDT	Special Weather Statement	OUN	Clay	42 min
Apr 13, 5:05 PM CDT	Special Weather Statement	OUN	Wilbarger	25 min
Apr 13, 5:23 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wichita, Wilbarger	37 min
Apr 13, 5:39 PM CDT	Special Weather Statement	OUN	Foard, Hardeman, Knox	36 min
Apr 13, 6:09 PM CDT	Special Weather Statement	OUN	Wilbarger	36 min
Apr 13, 6:45 PM CDT	Special Weather Statement	OUN	Wichita	30 min

Nearby

Special Weather Statements in Texas, 2021 Every special weather statement 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.