Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 873

May 27, 201731 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 27, 2017, 4:51 PM CDT for 31 counties in Oklahoma. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued: May 27, 2017, 4:51 PM CDT (21:51 UTC)
Expired: May 27, 2017, 5:15 PM CDT
In force: 24 min
Issued by: the Storm Prediction Center

All 31 counties

Carter County, OK, Cleveland County, OK, Coal County, OK, Craig County, OK, Creek County, OK, Garvin County, OK, Hughes County, OK, Johnston County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Norman radar (KTLX), 55 km from the middle of the area, began a volume at 21:51 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 12:00Z, 9.9 hours before the alert went out and 66 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: 3201 J/kg
Mixed-layer CIN: -231 J/kg
Mixed-layer LCL: 1144 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 26, 10:36 PM CDT	Mesoscale Discussion	SPC	Adair, Cherokee, Delaware, Haskell, Latimer, McIntosh and 5 more	54 min
May 27, 12:06 AM CDT	Severe Thunderstorm Watch	SPC	Delaware, Mayes	5 hr
May 27, 2:04 PM CDT	Mesoscale Discussion	SPC	Blaine, Cherokee, Craig, Creek, Delaware, Garfield and 22 more	86 min
May 27, 2:45 PM CDT	Mesoscale Discussion	SPC	Cimarron, Texas	2 hr
May 27, 4:01 PM CDT	Tornado Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 40 more	10 hr
May 27, 5:27 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Cimarron, Texas	6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2017 Every mesoscale discussion in 2017

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.