Alert archive / Oklahoma / Mesoscale Discussions in 2024

Mesoscale Discussion 849

May 20, 202413 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 20, 2024, 3:43 AM CDT for 13 counties in Oklahoma. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: May 20, 2024, 3:43 AM CDT (08:43 UTC)
Expired: May 20, 2024, 5:15 AM CDT
In force: 92 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 266

Counties Adair County, OK, Cherokee County, OK, Creek County, OK, Lincoln County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Payne County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 51 km from the middle of the area, began a volume at 08:43 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, 8.7 hours before the alert went out and 146 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: 2750 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 1280 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 317 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 12.5

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
May 19, 7:00 PM CDT	Mesoscale Discussion	SPC	Garfield, Grant, Kay, Kingfisher, Logan, Noble and 4 more	3 hr
May 19, 7:38 PM CDT	Severe Thunderstorm Watch	SPC	Blaine, Canadian, Cleveland, Garfield, Grady, Kay and 10 more	4 hr
May 19, 7:48 PM CDT	Mesoscale Discussion	SPC	Blaine, Kingfisher, Logan	117 min
May 19, 9:28 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Garfield, Grant, Kay, Logan, Major and 9 more	2 hr
May 19, 9:48 PM CDT	Severe Thunderstorm Watch	SPC	Alfalfa, Grant, Harper, Major, Woods, Woodward	4 hr
May 19, 11:42 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Cherokee, Craig, Creek, Delaware, Garfield and 18 more	6 hr
May 20, 1:42 AM CDT	Mesoscale Discussion	SPC	Creek, Garfield, Kingfisher, Lincoln, Logan, Noble and 6 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2024 Every mesoscale discussion in 2024

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.