Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 853

May 26, 20174 counties in Arkansas; 11 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at May 26, 2017, 10:36 PM CDT for 4 counties in Arkansas; 11 counties in Oklahoma. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: May 26, 2017, 10:36 PM CDT (03:36 UTC)
Expired: May 26, 2017, 11:30 PM CDT
In force: 54 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Benton County, AR, Crawford County, AR, Madison County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Okmulgee County, OK, Sequoyah County, OK, Wagoner County, OK

The radar

The Western Arkansas radar (KSRX), 66 km from the middle of the area, began a volume at 03:39 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.

Severe Thunderstorm Watch 272May 27, 12:05 AM CDT

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.6 hours before the alert went out and 159 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: 2596 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 942 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 6.5

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 27, 12:06 AM CDT	Severe Thunderstorm Watch	SPC	Baxter, Benton, Boone, Carroll, Fulton, Izard and 7 more	5 hr
May 27, 2:04 AM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Fulton, Independence and 10 more	116 min
May 27, 3:54 AM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Clay, Craighead, Fulton, Greene and 7 more	2 hr
May 27, 4:19 AM CDT	Severe Thunderstorm Watch	SPC	Clay, Craighead, Crittenden, Cross, Greene, Lawrence and 3 more	6 hr
May 27, 6:12 AM CDT	Mesoscale Discussion	SPC	Clay, Craighead, Crittenden, Cross, Greene, Mississippi and 1 more	2 hr
May 27, 4:01 PM CDT	Tornado Watch	SPC	Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more	10 hr
May 27, 6:17 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Cleburne, Craighead, Fulton, Greene and 12 more	58 min
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, 4:51 PM CDT	Mesoscale Discussion	SPC	Carter, Cleveland, Coal, Craig, Creek, Garvin and 25 more	24 min
May 27, 5:27 PM CDT	Severe Thunderstorm Watch	SPC	Beaver, Cimarron, Texas	6 hr

Nearby

Mesoscale Discussions in Oklahoma, 2017 Mesoscale Discussions in Arkansas, 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.