Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 1209

July 30, 20186 counties in Arkansas; McDonald County, Newton County, Missouri; 20 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jul 30, 2018, 3:47 PM CDT for 6 counties in Arkansas; McDonald County, Newton County, Missouri; 20 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 30, 2018, 3:47 PM CDT (20:47 UTC)
Expired: Jul 30, 2018, 6:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 28 counties

Benton County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Sebastian County, AR, Washington County, AR, McDonald County, MO, Newton County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Lincoln County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Noble County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 30 km from the middle of the area, began a volume at 20:47 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

Springfield, MO (KSGF), launched 12:00Z, 8.8 hours before the alert went out and 166 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: 299 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 643 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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, 9:50 AM CDT	Mesoscale Discussion	SPC	Bradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 9 more	115 min
Jul 30, 12:57 PM CDT	Mesoscale Discussion	SPC	Chicot, Desha	3 hr
Jul 29, 9:44 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 17 more	61 min
Jul 29, 10:04 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 26 more	7 hr
Jul 29, 11:49 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 35 more	56 min
Jul 30, 2:01 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Caddo, Carter, Choctaw, Cleveland and 22 more	59 min
Jul 30, 3:49 AM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Cotton and 9 more	5 hr
Jul 30, 6:27 AM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Pushmataha	93 min
Jul 30, 12:17 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Garfield, Grant, Kay, Major, Noble and 4 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2018 Mesoscale Discussions in Arkansas, 2018 Mesoscale Discussions in Missouri, 2018 Every mesoscale discussion in 2018

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.