Alert archive / Kansas / Ice Storm Warnings in 2018

Ice Storm Warning 1, NWS Topeka, KS

February 20, 20186 counties in Kansas

NWS Topeka, KS issued this ice storm warning at Feb 20, 2018, 4:19 AM CST for 6 counties in Kansas. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Feb 20, 2018, 4:19 AM CST (10:19 UTC)
Expired
Feb 20, 2018, 1:50 PM CST
In force
10 hr
Issued by
NWS Topeka, KS

Counties Anderson County, KS, Coffey County, KS, Douglas County, KS, Franklin County, KS, Lyon County, KS, Osage County, KS

The radar

The Topeka radar (KTWX), 79 km from the middle of the area, began a volume at 10:21 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, 10.3 hours before the alert went out and 56 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 2018-02-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 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 2018-02-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 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
2 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
540 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
273 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Topeka, KS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 19, 10:37 PM CSTSpecial Weather StatementTOPWashington23 min
Feb 19, 10:39 PM CSTSpecial Weather StatementTOPRiley36 min
Feb 19, 11:22 PM CSTSpecial Weather StatementTOPWabaunsee23 min
Feb 19, 11:25 PM CSTSpecial Weather StatementTOPNemaha35 min
Feb 19, 11:53 PM CSTSpecial Weather StatementTOPWabaunsee37 min
Feb 20, 12:02 AM CSTSpecial Weather StatementTOPNemaha28 min
Feb 20, 12:08 AM CSTSpecial Weather StatementTOPJefferson, Shawnee22 min
Feb 20, 12:26 AM CSTSpecial Weather StatementTOPBrown, Jackson49 min
Feb 20, 1:30 AM CSTSpecial Weather StatementTOPMorris30 min
Feb 20, 2:07 AM CSTSpecial Weather StatementTOPShawnee, Wabaunsee23 min
Feb 20, 2:36 AM CSTSpecial Weather StatementTOPJefferson24 min
Feb 20, 6:10 AM CSTSpecial Weather StatementTOPLyon35 min
Feb 20, 1:50 PM CSTWinter Weather AdvisoryTOPAnderson, Coffey, Franklin70 min
Feb 20, 3:17 PM CSTWinter Weather AdvisoryTOPAnderson, Brown, Clay, Cloud, Coffey, Dickinson and 17 more57 hr

Nearby

Ice Storm Warnings in Kansas, 2018Every ice storm warning 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.