Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 344

April 11, 202012 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2020, 11:41 PM CDT for 12 counties in Oklahoma. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2020, 11:41 PM CDT (04:41 UTC)
Expired: Apr 12, 2020, 1:15 AM CDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Atoka County, OK, Bryan County, OK, Carter County, OK, Coal County, OK, Garvin County, OK, Jefferson County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, Murray County, OK, Pontotoc County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 127 km from the middle of the area, began a volume at 04:42 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, 4.7 hours before the alert went out and 151 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: 509 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 323 m²/s²
0-3 km storm-relative helicity: 406 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 10.7

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
Apr 11, 8:57 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Cleveland, Coal, Garvin and 11 more	63 min
Apr 11, 9:01 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Coal, Garvin, Jefferson and 6 more	4 hr
Apr 11, 9:23 PM CDT	Mesoscale Discussion	SPC	Comanche, Cotton, Jackson, Tillman	67 min
Apr 12, 1:10 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 34 more	95 min
Apr 12, 2:51 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 12 more	5 hr
Apr 12, 4:44 PM CDT	Mesoscale Discussion	SPC	Adair	2 hr
Apr 12, 6:14 PM CDT	Mesoscale Discussion	SPC	McCurtain	91 min

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.