Alert archive / Oklahoma / Mesoscale Discussions in 2017

Mesoscale Discussion 266

March 6, 20179 counties in Arkansas; Barry County, McDonald County, Missouri; 10 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Mar 6, 2017, 9:16 PM CST for 9 counties in Arkansas; Barry County, McDonald County, Missouri; 10 counties in Oklahoma. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Mar 6, 2017, 9:16 PM CST (03:16 UTC)
Expired
Mar 6, 2017, 11:15 PM CST
In force
119 min
Issued by
the Storm Prediction Center
All 21 counties

Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Newton County, AR, Sebastian County, AR, Washington County, AR, Barry County, MO, McDonald County, MO, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell 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), 73 km from the middle of the area, began a volume at 03:17 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.

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.3 hours before the alert went out and 114 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-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 2017-03-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 629 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2017-03-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 319 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
629 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
1110 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
319 m²/s²
0-3 km storm-relative helicity
542 m²/s²
Significant tornado parameter
1.7
Supercell composite
8.2

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.

IssuedProductOfficeCountiesLasted
Mar 6, 6:02 PM CSTMesoscale DiscussionSPCBenton, Boone, Carroll, Crawford, Franklin, Madison and 2 more58 min
Mar 6, 6:51 PM CSTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more8 hr
Mar 6, 8:10 PM CSTMesoscale DiscussionSPCBaxter, Boone, Carroll, Clay, Cleburne, Conway and 27 more3 hr
Mar 6, 9:21 PM CSTTornado WatchSPCBaxter, Boone, Clay, Cleburne, Conway, Craighead and 31 more8 hr
Mar 7, 2:58 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 47 more92 min
Mar 7, 3:37 AM CSTSevere Thunderstorm WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 25 more8 hr
Mar 7, 8:03 AM CSTMesoscale DiscussionSPCAshley, Chicot, Desha, Drew, Union117 min
Mar 6, 6:31 PM CSTMesoscale DiscussionSPCAdair, Andrew, Bates, Benton, Buchanan, Caldwell and 32 more119 min
Mar 6, 7:19 PM CSTMesoscale DiscussionSPCBuchanan, Caldwell, Carroll, Cass, Chariton, Clay and 15 more116 min
Mar 6, 8:22 PM CSTMesoscale DiscussionSPCAudrain, Boone, Callaway, Clark, Cole, Crawford and 19 more2 hr
Mar 6, 8:52 PM CSTTornado WatchSPCAudrain, Boone, Callaway, Clark, Cole, Crawford and 25 more6 hr
Mar 6, 11:13 PM CSTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Christian, Crawford and 38 more2 hr

Nearby

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