Alert archive / Kansas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 15, NWS Topeka, KS

April 9, 2013Lyon County, Wabaunsee County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Apr 9, 2013, 10:57 PM CDT for Lyon County, Wabaunsee County, Kansas. It was in force for 33 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 9, 2013, 10:57 PM CDT (03:57 UTC)
Expired
Apr 9, 2013, 11:30 PM CDT
In force
33 min
Issued by
NWS Topeka, KS
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Lyon County, KS, Wabaunsee County, KS

The radar

The Topeka radar (KTWX), 33 km from the middle of the area, began a volume at 03:56 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 9, 5:45 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 4.0 hours before the alert went out and 57 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 2013-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 972 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 2013-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 239 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
972 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
719 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
239 m²/s²
0-3 km storm-relative helicity
215 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Topeka, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 9, 7:53 PM CDT, 3 hours 4 minutes earlier.

Area forecast discussion, Apr 9, 7:53 PM CDT, 3 hours 4 minutes before
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Hazardous weather outlook, Apr 9, 10:06 PM CDT, 51 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TOPEKA KS
1006 PM CDT TUE APR 9 2013

KSZ008>012-020>024-026-034>040-054>056-058-059-110315-
REPUBLIC-WASHINGTON-MARSHALL-NEMAHA-BROWN-CLOUD-CLAY-RILEY-
POTTAWATOMIE-JACKSON-JEFFERSON-OTTAWA-DICKINSON-GEARY-MORRIS-
WABAUNSEE-SHAWNEE-DOUGLAS-LYON-OSAGE-FRANKLIN-COFFEY-ANDERSON-
1006 PM CDT TUE APR 9 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL...NORTH
CENTRAL AND NORTHEAST KANSAS.

.DAY ONE...TONIGHT.

SCATTERED THUNDERSTORMS...SOME SEVERE...WILL MOVE ACROSS THE AREA
THIS EVENING AND INTO THE EARLY MORNING HOURS. LARGE HAIL UP TO
THE SIZE OF QUARTERS WILL BE THE PRIMARY THREAT WITH ANY SEVERE
STORMS.

BEHIND THE COLD FRONT...TEMPERATURES WILL FALL TO NEAR OR BELOW
FREEZING TONIGHT THROUGH THE OVERNIGHT HOURS ACROSS NORTH CENTRAL
AND CENTRAL KANSAS. PERIODS OF FREEZING DRIZZLE...FREEZING RAIN
AND SLEET ARE POSSIBLE GENERALLY ALONG AND WEST OF A MARYSVILLE TO
MANHATTAN TO COUNCIL GROVE LINE WITH LIGHT ACCUMULATIONS OF
ICE...GENERALLY LESS THAN A QUARTER INCH...MAINLY ON EXPOSED AND
ELEVATED SURFACES. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10
AM WEDNESDAY.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

FREEZING RAIN AND SLEET ARE POSSIBLE ACROSS NORTH CENTRAL AND
CENTRAL KANSAS THROUGH WEDNESDAY MORNING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED THROUGH TONIGHT.

In the hours before

Local storm report, Apr 9, 10:05 PM CDT, 52 minutes before
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Local storm report, Apr 9, 10:15 PM CDT, 42 minutes before
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Local storm report, Apr 9, 10:23 PM CDT, 34 minutes before
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Special weather statement, Apr 9, 10:30 PM CDT, 27 minutes before
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Local storm report, Apr 9, 10:47 PM CDT, 10 minutes before
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Local storm report, Apr 9, 10:50 PM CDT, 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TOPEKA KS
1050 PM CDT TUE APR 09 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1045 PM     HAIL             AMERICUS                38.51N 96.26W
04/09/2013  E1.00 INCH       LYON               KS   TRAINED SPOTTER

&&

KSANDERS

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 8:34 PM CDTSpecial Weather StatementTOPCloud, Ottawa56 min
Apr 9, 8:54 PM CDTSevere Thunderstorm WarningTOPCloud, Republic36 min
Apr 9, 9:47 PM CDTSpecial Weather StatementTOPClay13 min
Apr 9, 9:58 PM CDTSpecial Weather StatementTOPDickinson17 min
Apr 9, 10:12 PM CDTSevere Thunderstorm WarningTOPDickinson18 min
Apr 9, 10:30 PM CDTSpecial Weather StatementTOPRiley15 min
Apr 9, 10:35 PM CDTSevere Thunderstorm WarningTOPLyon25 min
Apr 9, 11:06 PM CDTSpecial Weather StatementTOPMorris24 min
Apr 9, 11:08 PM CDTSpecial Weather StatementTOPMarshall22 min
Apr 10, 5:12 AM CDTWinter Storm WarningTOPClay, Dickinson, Geary, Morris, Ottawa8 hr
Apr 10, 6:02 PM CDTWinter Weather AdvisoryTOPClay, Cloud, Ottawa, Republic, Washington4 hr

Nearby

Severe Thunderstorm Warnings in Kansas, 2013Every severe thunderstorm warning in 2013

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.