Alert archive / Oklahoma / Mesoscale Discussions in 2023

Mesoscale Discussion 564

April 19, 202315 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2023, 6:31 PM CDT for 15 counties in Oklahoma. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2023, 6:31 PM CDT (23:31 UTC)
Expired: Apr 19, 2023, 7:30 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch needed soon
Chance of a watch: 95%

Counties Creek County, OK, Lincoln County, OK, Logan County, OK, Mayes County, OK, Noble County, OK, Nowata County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Norman radar (KTLX), 94 km from the middle of the area, began a volume at 23:30 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.

Tornado Watch 148Apr 19, 6:40 PM CDT

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.5 hours before the alert went out and 110 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: 711 J/kg
Mixed-layer CIN: -395 J/kg
Mixed-layer LCL: 619 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 341 m²/s²
0-3 km storm-relative helicity: 414 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 19, 3:57 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Comanche, Cotton, Garvin, Grady and 5 more	2 hr
Apr 19, 4:48 PM CDT	Tornado Watch	SPC	Caddo, Canadian, Carter, Cleveland, Comanche, Cotton and 17 more	6 hr
Apr 19, 6:11 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Comanche, Creek, Grady and 6 more	94 min
Apr 19, 6:40 PM CDT	Tornado Watch	SPC	Creek, Okfuskee, Okmulgee, Osage, Pawnee, Tulsa and 1 more	5 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.