Alert archive / Oklahoma / Mesoscale Discussions in 2025

Mesoscale Discussion 849

May 17, 202522 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 17, 2025, 11:30 PM CDT for 22 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 17, 2025, 11:30 PM CDT (04:30 UTC)
Expired: May 18, 2025, 1:30 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 283

All 22 counties

Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Creek County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, McIntosh County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Tulsa County, OK

The radar

The Norman radar (KTLX), 16 km from the middle of the area, began a volume at 04:34 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, 4.5 hours before the alert went out and 26 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: 250 J/kg
Mixed-layer CIN: -259 J/kg
Mixed-layer LCL: 1896 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 243 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
May 17, 7:40 PM CDT	Mesoscale Discussion	SPC	Atoka, Beckham, Blaine, Bryan, Caddo, Canadian and 33 more	2 hr
May 17, 7:49 PM CDT	Severe Thunderstorm Watch	SPC	McCurtain	6 hr
May 17, 9:53 PM CDT	Mesoscale Discussion	SPC	Choctaw, Latimer, LeFlore, McCurtain, Pushmataha	2 hr
May 17, 9:54 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Blaine, Caddo, Canadian, Cherokee, Cleveland and 31 more	8 hr
May 18, 3:15 AM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Haskell, Latimer, LeFlore, McIntosh and 7 more	60 min
May 18, 4:23 AM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Haskell, Latimer, LeFlore, Sequoyah	67 min
May 18, 11:40 AM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Delaware, Mayes, Muskogee, Sequoyah and 1 more	2 hr
May 18, 3:21 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 15 more	114 min
May 18, 3:38 PM CDT	Tornado Watch	SPC	Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 26 more	8 hr
May 18, 5:11 PM CDT	Mesoscale Discussion	SPC	Ellis, Harper, Woodward	94 min

Nearby

Mesoscale Discussions in Oklahoma, 2025 Every mesoscale discussion in 2025

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.