Alert archive / Oklahoma / Mesoscale Discussions in 2015

Mesoscale Discussion 2065

December 26, 20158 counties in Oklahoma; 7 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Dec 26, 2015, 11:39 AM CST for 8 counties in Oklahoma; 7 counties in Texas. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Dec 26, 2015, 11:39 AM CST (17:39 UTC)
Expired: Dec 26, 2015, 2:15 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Caddo County, OK, Canadian County, OK, Comanche County, OK, Grady County, OK, Logan County, OK, Oklahoma County, OK, Payne County, OK, Tillman County, OK, Baylor County, TX, Haskell County, TX, Knox County, TX, Stonewall County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 82 km from the middle of the area, began a volume at 17:40 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, 5.7 hours before the alert went out and 66 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: 608 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 537 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 276 m²/s²
0-3 km storm-relative helicity: 313 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 26, 12:02 PM CST	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 16 more	58 min
Dec 26, 12:35 PM CST	Tornado Watch	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 18 more	9 hr
Dec 26, 3:51 PM CST	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 18 more	114 min
Dec 26, 5:52 PM CST	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 11 more	83 min
Dec 26, 2:58 PM CST	Mesoscale Discussion	SPC	Austin, Bastrop, Blanco, Brazos, Burleson, Burnet and 15 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2015 Mesoscale Discussions in Texas, 2015 Every mesoscale discussion in 2015

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.