Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 1355

July 30, 202018 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2020, 4:48 AM CDT for 18 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 30, 2020, 4:48 AM CDT (09:48 UTC)
Expired: Jul 30, 2020, 7:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

Counties Cherokee County, OK, Creek County, OK, Garfield County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, Mayes County, OK, Muskogee County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Norman radar (KTLX), 91 km from the middle of the area, began a volume at 09:48 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, 9.8 hours before the alert went out and 106 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: 1768 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 1314 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.4

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
Jul 30, 12:55 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Cherokee, Creek, Garfield, Grant and 13 more	3 hr
Jul 30, 3:31 PM CDT	Mesoscale Discussion	SPC	Atoka, Caddo, Canadian, Carter, Cleveland, Coal and 25 more	119 min
Jul 30, 3:41 PM CDT	Mesoscale Discussion	SPC	McCurtain	2 hr
Jul 30, 4:35 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Caddo, Carter, Choctaw, Cleveland and 27 more	6 hr
Jul 30, 6:13 PM CDT	Mesoscale Discussion	SPC	Atoka, Carter, Coal, Garvin, Jefferson, Johnston and 6 more	92 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.