Alert archive / Oklahoma / Mesoscale Discussions in 2020

Mesoscale Discussion 1649

August 31, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Aug 31, 2020, 4:18 AM CDT for 4 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Aug 31, 2020, 4:18 AM CDT (09:18 UTC)
Expired
Aug 31, 2020, 6:15 AM CDT
In force
117 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...watch unlikely
Chance of a watch
20%
All 34 counties

Benton County, AR, Crawford County, AR, Scott County, AR, Sebastian County, AR, Washington County, AR, Cherokee County, KS, Crawford County, KS, Labette County, KS, Neosho County, KS, Barton County, MO, Jasper County, MO, McDonald County, MO, Newton County, MO, Adair County, OK, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 35 km from the middle of the area, began a volume at 09:19 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, 9.3 hours before the alert went out and 161 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 2020-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 922 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 2020-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.19395878Sfc1 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
922 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
693 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.0

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.

IssuedProductOfficeCountiesLasted
Aug 31, 6:20 AM CDTSevere Thunderstorm WatchSPCArkansas, Clark, Cleveland, Conway, Crawford, Dallas and 22 more4 hr
Aug 31, 9:38 AM CDTMesoscale DiscussionSPCArkansas, Clark, Cleveland, Dallas, Grant, Hot Spring and 6 more97 min
Aug 31, 12:16 PM CDTMesoscale DiscussionSPCClay, Craighead, Crittenden, Greene, Mississippi, Phillips89 min
Aug 30, 11:42 PM CDTMesoscale DiscussionSPCCloud, Jewell, Lincoln, Mitchell, Osborne, Ottawa and 5 more2 hr
Aug 31, 4:56 AM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Douglas, Franklin, Jackson and 8 more2 hr
Aug 31, 8:41 AM CDTSevere Thunderstorm WatchSPCBourbon, Crawford, Linn, Miami5 hr
Aug 31, 3:34 PM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Labette, Montgomery, Neosho86 min
Aug 31, 3:53 PM CDTSevere Thunderstorm WatchSPCChautauqua, Cherokee, Crawford, Labette, Montgomery, Neosho10 hr
Aug 31, 6:13 PM CDTMesoscale DiscussionSPCChautauqua, Cherokee, Labette, Montgomery92 min
Aug 31, 10:50 AM CDTSevere Thunderstorm WatchSPCCrawford, Franklin, Gasconade, Iron, Jefferson, Madison and 4 more3 hr
Aug 31, 11:04 AM CDTMesoscale DiscussionSPCBarton, Benton, Callaway, Camden, Cedar, Cole and 26 more86 min
Aug 31, 12:43 PM CDTMesoscale DiscussionSPCBarry, Barton, Bollinger, Butler, Cape Girardeau, Carter and 36 more92 min

Nearby

Mesoscale Discussions in Oklahoma, 2020Mesoscale Discussions in Arkansas, 2020Mesoscale Discussions in Kansas, 2020Every mesoscale discussion in 2020

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.