Alert archive / Oklahoma / Mesoscale Discussions in 2019

Mesoscale Discussion 491

May 1, 201914 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 1, 2019, 12:00 AM CDT for 14 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 1, 2019, 12:00 AM CDT (05:00 UTC)
Expired: May 1, 2019, 2:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Caddo County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, McClain County, OK, Murray County, OK, Stephens County, OK, Tillman County, OK

The radar

The Altus AFB radar (KFDR), 69 km from the middle of the area, began a volume at 05:01 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 00:00Z, 5.0 hours before the alert went out and 105 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: 65 J/kg
Mixed-layer CIN: -282 J/kg
Mixed-layer LCL: 862 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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, 9:41 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 8 more	94 min
Apr 30, 10:58 PM CDT	Tornado Watch	SPC	Atoka, Bryan, Choctaw, Haskell, Latimer, LeFlore and 5 more	4 hr
May 1, 12:21 PM CDT	Mesoscale Discussion	SPC	Caddo, Carter, Cleveland, Comanche, Cotton, Garvin and 15 more	114 min
May 1, 1:00 PM CDT	Severe Thunderstorm Watch	SPC	Carter, Cleveland, Comanche, Cotton, Garvin, Grady and 11 more	9 hr
May 1, 3:25 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Comanche, Cotton, Garvin, Grady and 11 more	2 hr
May 1, 4:49 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Coal, Johnston, Latimer and 4 more	116 min
May 1, 5:29 PM CDT	Severe Thunderstorm Watch	SPC	Atoka, Bryan, Choctaw, Coal, Hughes, Latimer and 4 more	8 hr

Nearby

Mesoscale Discussions in Oklahoma, 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.