Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 1227

July 3, 201722 counties in Oklahoma; 8 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jul 3, 2017, 10:30 PM CDT for 22 counties in Oklahoma; 8 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 3, 2017, 10:30 PM CDT (03:30 UTC)
Expired: Jul 3, 2017, 11:30 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center

All 30 counties

Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, Love County, OK, Marshall County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Seminole County, OK, Tulsa County, OK, Wagoner County, OK, Archer County, TX, Clay County, TX, Cooke County, TX, Grayson County, TX, Jack County, TX, Montague County, TX, Wichita County, TX, Wise County, TX

The radar

The Norman radar (KTLX), 88 km from the middle of the area, began a volume at 03:33 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 395Jul 3, 10:50 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 3.5 hours before the alert went out and 88 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: 2711 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1254 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 17.0

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
Jul 3, 7:26 PM CDT	Mesoscale Discussion	SPC	Beckham, Caddo, Canadian, Cleveland, Comanche, Custer and 16 more	64 min
Jul 3, 8:23 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Cleveland, Coal, Creek and 20 more	67 min
Jul 3, 8:39 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Carter, Cherokee, Choctaw, Coal and 26 more	6 hr
Jul 4, 12:51 AM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Haskell and 5 more	114 min
Jul 3, 10:50 PM CDT	Severe Thunderstorm Watch	SPC	Collin, Cooke, Dallas, Delta, Denton, Fannin and 12 more	5 hr
Jul 4, 4:44 PM CDT	Mesoscale Discussion	SPC	Bailey, Castro, Deaf Smith, Oldham, Parmer	2 hr
Jul 4, 6:51 PM CDT	Severe Thunderstorm Watch	SPC	Bailey, Briscoe, Castro, Cochran, Crosby, Dickens and 14 more	6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2017 Mesoscale Discussions in Texas, 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.