Alert archive / Oklahoma / Mesoscale Discussions in 2018

Mesoscale Discussion 1535

October 7, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Oct 7, 2018, 12:28 PM CDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Oct 7, 2018, 12:28 PM CDT (17:28 UTC)
Expired
Oct 7, 2018, 3:00 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Benton County, AR, Crawford County, AR, Sebastian County, AR, Washington County, AR, Cherokee County, KS, Jasper County, MO, McDonald County, MO, Newton County, MO, Adair County, OK, Cherokee County, OK, Delaware County, OK, Haskell County, OK, LeFlore County, OK, Ottawa County, OK, Sequoyah County, OK

The radar

The Tulsa radar (KINX), 89 km from the middle of the area, began a volume at 17:31 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

Springfield, MO (KSGF), launched 12:00Z, 5.5 hours before the alert went out and 106 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 12:00Z on 2018-10-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 723 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 12:00Z on 2018-10-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.193958Sfc1 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
723 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
857 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.5

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.

IssuedProductOfficeCountiesLasted
Oct 7, 1:33 PM CDTMesoscale DiscussionSPCCallaway, Camden, Cole, Crawford, Franklin, Gasconade and 15 more2 hr
Oct 7, 3:47 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Caddo, Canadian, Carter and 48 more2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2018Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Missouri, 2018Every mesoscale discussion in 2018

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.