Alert archive / Oklahoma / Mesoscale Discussions in 2019

Mesoscale Discussion 482

April 30, 20195 counties in Oklahoma; Baylor County, Wilbarger County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2019, 2:56 PM CDT for 5 counties in Oklahoma; Baylor County, Wilbarger County, Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 30, 2019, 2:56 PM CDT (19:56 UTC)
Expired: Apr 30, 2019, 5:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Caddo County, OK, Comanche County, OK, Grady County, OK, Oklahoma County, OK, Tillman County, OK, Baylor County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 70 km from the middle of the area, began a volume at 19:58 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 114Apr 30, 4:25 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 7.9 hours before the alert went out and 103 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: 1242 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 541 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 153 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.7

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 30, 11:41 AM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Caddo, Canadian, Carter, Cherokee and 41 more	2 hr
Apr 30, 12:02 PM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Caddo, Carter, Cherokee and 45 more	13 hr
Apr 30, 3:26 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Delaware, McIntosh, Mayes and 4 more	2 hr
Apr 30, 5:21 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Coal, Cotton, Creek, Garvin and 15 more	84 min
Apr 30, 6:00 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Craig, Delaware, LeFlore, Mayes and 5 more	90 min
Apr 29, 7:01 PM CDT	Severe Thunderstorm Watch	SPC	Andrews, Borden, Dawson, Ector, Gaines, Howard and 7 more	3 hr
Apr 29, 9:35 PM CDT	Mesoscale Discussion	SPC	Ector, Loving, Winkler	115 min
Apr 30, 1:53 PM CDT	Mesoscale Discussion	SPC	Archer, Bosque, Brown, Callahan, Clay, Coleman and 28 more	2 hr
Apr 30, 2:06 PM CDT	Mesoscale Discussion	SPC	Bailey, Borden, Cochran, Crosby, Dawson, Dickens and 17 more	2 hr
Apr 30, 2:19 PM CDT	Tornado Watch	SPC	Archer, Baylor, Bosque, Clay, Collin, Comanche and 24 more	9 hr
Apr 30, 4:26 PM CDT	Severe Thunderstorm Watch	SPC	Borden, Briscoe, Brown, Callahan, Childress, Coke and 44 more	8 hr
Apr 30, 6:47 PM CDT	Mesoscale Discussion	SPC	Borden, Coke, Cottle, Crane, Crockett, Crosby and 36 more	118 min

Nearby

Mesoscale Discussions in Oklahoma, 2019 Mesoscale Discussions in Texas, 2019 Every mesoscale discussion in 2019

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.