Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 963

June 21, 20205 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2020, 10:13 PM CDT for 5 counties in Oklahoma. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jun 21, 2020, 10:13 PM CDT (03:13 UTC)
Expired: Jun 21, 2020, 11:45 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 293

Counties Beckham County, OK, Caddo County, OK, Custer County, OK, Roger Mills County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 129 km from the middle of the area, began a volume at 03:15 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, 3.2 hours before the alert went out and 180 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: 42 J/kg
Mixed-layer CIN: -455 J/kg
Mixed-layer LCL: 1589 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jun 22, 12:42 AM CDT	Mesoscale Discussion	SPC	Carter, Coal, Cotton, Garvin, Jefferson, Johnston and 6 more	33 min
Jun 22, 3:16 AM CDT	Mesoscale Discussion	SPC	Beckham, Caddo, Comanche, Greer, Harmon, Jackson and 4 more	89 min
Jun 22, 3:13 PM CDT	Mesoscale Discussion	SPC	Cimarron, Roger Mills, Texas	2 hr
Jun 22, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Cimarron, Texas	7 hr
Jun 22, 6:00 PM CDT	Mesoscale Discussion	SPC	Beckham, Cimarron, Texas	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2020 Every mesoscale discussion in 2020

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.