Alert archive / Oklahoma / Mesoscale Discussions in 2023

Mesoscale Discussion 565

April 19, 202320 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2023, 8:02 PM CDT for 20 counties in Oklahoma. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2023, 8:02 PM CDT (01:02 UTC)
Expired: Apr 19, 2023, 9:30 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center
Concerning: Tornado watch 147...148

Counties Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 33 km from the middle of the area, began a volume at 01:02 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, 1.0 hours before the alert went out and 16 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: 1620 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1145 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 427 m²/s²
0-3 km storm-relative helicity: 523 m²/s²
Significant tornado parameter: 4.0
Supercell composite: 19.0

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 19, 9:31 PM CDT	Mesoscale Discussion	SPC	Cleveland, Lincoln, Okfuskee, Pottawatomie, Seminole	59 min
Apr 20, 12:47 PM CDT	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Choctaw, Haskell, Latimer and 4 more	58 min
Apr 20, 1:35 PM CDT	Severe Thunderstorm Watch	SPC	Choctaw, Haskell, LeFlore, Pushmataha, Sequoyah	9 hr
Apr 20, 1:47 PM CDT	Severe Thunderstorm Watch	SPC	McCurtain	9 hr

Nearby

Mesoscale Discussions in Oklahoma, 2023 Every mesoscale discussion in 2023

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.