Alert archive / Oklahoma / Mesoscale Discussions in 2019

Mesoscale Discussion 741

May 22, 20197 counties in Oklahoma; Wichita County, Texas

The Storm Prediction Center issued this mesoscale discussion at May 22, 2019, 7:56 PM CDT for 7 counties in Oklahoma; Wichita County, Texas. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: May 22, 2019, 7:56 PM CDT (00:56 UTC)
Expired: May 22, 2019, 9:30 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Caddo County, OK, Comanche County, OK, Cotton County, OK, Grady County, OK, McClain County, OK, Stephens County, OK, Tillman County, OK, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 58 km from the middle of the area, began a volume at 00:56 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, 0.9 hours before the alert went out and 115 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: 3161 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 985 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 255 m²/s²
Significant tornado parameter: 4.9
Supercell composite: 20.5

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 22, 7:32 PM CDT	Mesoscale Discussion	SPC	Craig, Delaware, Mayes, Nowata, Ottawa, Rogers and 3 more	88 min
May 22, 9:34 PM CDT	Mesoscale Discussion	SPC	Craig, Delaware, Mayes, Ottawa	56 min
May 22, 9:44 PM CDT	Tornado Watch	SPC	Craig, Creek, Delaware, Mayes, Nowata, Osage and 6 more	8 hr
May 23, 12:59 AM CDT	Mesoscale Discussion	SPC	Craig, Creek, Delaware, Mayes, Nowata, Osage and 5 more	91 min
May 23, 7:35 AM CDT	Mesoscale Discussion	SPC	Beaver, Cimarron, Texas	85 min
May 23, 11:26 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Grant, Harper, Kay, Woods	94 min
May 23, 1:42 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Ellis, Grant, Harper, Major and 2 more	63 min
May 23, 1:47 PM CDT	Mesoscale Discussion	SPC	Beckham, Ellis, Roger Mills	118 min
May 23, 3:11 PM CDT	Tornado Watch	SPC	Beaver, Ellis, Harper	7 hr
May 23, 5:48 PM CDT	Mesoscale Discussion	SPC	Beaver, Ellis, Harper, Woods, Woodward	87 min

Nearby

Mesoscale Discussions in Oklahoma, 2019 Mesoscale Discussions in Texas, 2019 Every mesoscale discussion in 2019

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.