Alert archive / Kansas / Mesoscale Discussions in 2017

Mesoscale Discussion 1651

September 16, 201712 counties in Kansas; Holt County, Missouri; Richardson County, Nebraska

The Storm Prediction Center issued this mesoscale discussion at Sep 16, 2017, 7:32 PM CDT for 12 counties in Kansas; Holt County, Missouri; Richardson County, Nebraska. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Sep 16, 2017, 7:32 PM CDT (00:32 UTC)
Expired
Sep 16, 2017, 9:30 PM CDT
In force
118 min
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Brown County, KS, Dickinson County, KS, Geary County, KS, Harvey County, KS, Jackson County, KS, Marion County, KS, McPherson County, KS, Morris County, KS, Nemaha County, KS, Pottawatomie County, KS, Riley County, KS, Wabaunsee County, KS, Holt County, MO, Richardson County, NE

The radar

The Topeka radar (KTWX), 32 km from the middle of the area, began a volume at 00:32 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

Topeka, KS (KFOE), launched 00:00Z, 0.5 hours before the alert went out and 82 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, Topeka, KS at 00:00Z on 2017-09-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1943 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, Topeka, KS at 00:00Z on 2017-09-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 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
1943 J/kg
Mixed-layer CIN
-49 J/kg
Mixed-layer LCL
1257 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
228 m²/s²
Significant tornado parameter
0.6
Supercell composite
6.2

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

Mesoscale Discussions in Kansas, 2017Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Nebraska, 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.