Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 1082

June 18, 201720 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Jun 18, 2017, 7:18 AM CDT for 20 counties in Oklahoma. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jun 18, 2017, 7:18 AM CDT (12:18 UTC)
Expired: Jun 18, 2017, 9:15 AM CDT
In force: 117 min
Issued by: the Storm Prediction Center

Counties Adair County, OK, Atoka County, OK, Cherokee County, OK, Coal County, OK, Creek County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 78 km from the middle of the area, began a volume at 12:20 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 12:00Z, 0.3 hours before the alert went out and 174 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: 2965 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 571 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.9

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 17, 8:23 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Grant, Harper, Kay, Woods	2 hr
Jun 17, 9:33 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Garfield, Grant, Harper, Kay, Lincoln and 6 more	7 hr
Jun 17, 9:34 PM CDT	Mesoscale Discussion	SPC	Craig, Delaware, Kay, Mayes, Nowata, Osage and 5 more	116 min
Jun 17, 10:18 PM CDT	Severe Thunderstorm Watch	SPC	Craig, Creek, Nowata, Osage, Ottawa, Pawnee and 3 more	6 hr
Jun 17, 11:55 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Craig, Creek, Delaware, Garfield, Grant and 12 more	95 min
Jun 18, 3:44 AM CDT	Mesoscale Discussion	SPC	Cleveland, Coal, Creek, Garfield, Hughes, Kingfisher and 14 more	2 hr
Jun 18, 4:14 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Atoka, Cherokee, Cleveland, Coal, Creek and 20 more	6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2017 Every mesoscale discussion in 2017

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.