Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 1507

August 15, 20204 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Aug 15, 2020, 9:28 PM CDT for 4 counties in Oklahoma. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Aug 15, 2020, 9:28 PM CDT (02:28 UTC)
Expired: Aug 15, 2020, 11:00 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 442

Counties Noble County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK

The radar

The Tulsa radar (KINX), 103 km from the middle of the area, began a volume at 02:29 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, 2.5 hours before the alert went out and 158 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: 4213 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1514 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 51 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
Aug 15, 7:05 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Creek, Delaware, Mayes and 12 more	55 min
Aug 15, 7:36 PM CDT	Severe Thunderstorm Watch	SPC	Creek, Mayes, Muskogee, Okfuskee, Okmulgee, Osage and 5 more	2 hr
Aug 16, 11:36 AM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Garvin, Grady, Logan and 5 more	114 min
Aug 16, 2:13 PM CDT	Mesoscale Discussion	SPC	Atoka, Beckham, Bryan, Caddo, Carter, Choctaw and 21 more	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.