Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

May 31, 2021Harmon County, Oklahoma

NWS Norman, OK issued this special weather statement at May 31, 2021, 1:52 AM CDT for Harmon County, Oklahoma. It was in force for 38 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: May 31, 2021, 1:52 AM CDT (06:52 UTC)
Expired: May 31, 2021, 2:30 AM CDT
In force: 38 min
Issued by: NWS Norman, OK

County Harmon County, OK

The radar

The Altus AFB radar (KFDR), 105 km from the middle of the area, began a volume at 06:53 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 6.9 hours before the alert went out and 167 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: 436 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 1025 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.7

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 May 30, 11:56 PM CDT, 1 hour 56 minutes earlier.

Area forecast discussion, May 30, 11:56 PM CDT, 1 hour 56 minutes before

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Hazardous weather outlook, May 30, 8:58 PM CDT, 4 hours 54 minutes before

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In the hours before

Special weather statement, May 31, 1:52 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
May 30, 8:11 PM CDT	River Flood Warning	OUN	Major, Woods, Woodward	25 hr
May 30, 8:14 PM CDT	River Flood Advisory	OUN	Kingfisher, Logan	48 hr
May 30, 8:15 PM CDT	River Flood Advisory	OUN	Alfalfa, Woods	19 hr
May 31, 2:59 AM CDT	Areal Flood Advisory	OUN	Beckham, Greer, Harmon, Jackson, Kiowa	6 hr
May 31, 4:07 AM CDT	Flash Flood Warning	OUN	Greer, Harmon	5 hr
May 31, 6:46 AM CDT	Areal Flood Advisory	OUN	Comanche	3 hr
May 31, 11:26 AM CDT	River Flood Warning	OUN	Greer, Jackson	3 hr
May 31, 11:27 AM CDT	River Flood Advisory	OUN	Comanche, Cotton	27 hr
May 31, 11:30 AM CDT	River Flood Advisory	OUN	Cotton	51 hr
May 31, 2:46 PM CDT	River Flood Advisory	OUN	Greer, Jackson	19 min
May 31, 3:34 PM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	10 hr
May 31, 3:35 PM CDT	River Flood Advisory	OUN	Blaine, Canadian	6 hr

Nearby

Special Weather Statements in Oklahoma, 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.