Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 427

April 3, 201710 counties in Oklahoma; Hemphill County, Wheeler County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2017, 11:10 PM CDT for 10 counties in Oklahoma; Hemphill County, Wheeler County, Texas. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Apr 3, 2017, 11:10 PM CDT (04:10 UTC)
Expired: Apr 4, 2017, 12:15 AM CDT
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Kingfisher County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Hemphill County, TX, Wheeler County, TX

The radar

The Altus AFB radar (KFDR), 149 km from the middle of the area, began a volume at 04:11 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 4.2 hours before the alert went out and 229 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3063 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 229 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Apr 4, 1:48 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Canadian, Cherokee, Cleveland, Coal and 34 more	2 hr
Apr 4, 2:31 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Atoka, Bryan, Canadian, Cherokee, Choctaw and 38 more	8 hr
Apr 4, 3:53 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Cleveland, Coal, Creek, Hughes and 19 more	97 min
Apr 4, 6:34 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Cherokee, Choctaw, Craig, Creek and 22 more	56 min
Apr 4, 6:37 PM CDT	Mesoscale Discussion	SPC	Bowie, Camp, Cass, Dallas, Delta, Fannin and 12 more	113 min

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.