Alert archive / Kansas / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 25, NWS Topeka, KS

April 6, 2010Coffey County, Lyon County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Apr 6, 2010, 6:41 PM CDT for Coffey County, Lyon County, Kansas. It was in force for 49 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 6, 2010, 6:41 PM CDT (23:41 UTC)
Expired: Apr 6, 2010, 7:30 PM CDT
In force: 49 min
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Coffey County, KS, Lyon County, KS

The radar

The Topeka radar (KTWX), 77 km from the middle of the area, began a volume at 23:42 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.

Issued	Product	Office	Lasted
Apr 6, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 11.7 hours before the alert went out and 77 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1743 J/kg
Mixed-layer CIN: -254 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 522 m²/s²
0-3 km storm-relative helicity: 542 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 6, 3:11 PM CDT, 3 hours 30 minutes earlier.

Area forecast discussion, Apr 6, 3:11 PM CDT, 3 hours 30 minutes before

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Hazardous weather outlook, Apr 6, 4:55 PM CDT, 1 hour 46 minutes before

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In the hours before

Local storm report, Apr 6, 4:45 PM CDT, 1 hour 56 minutes before

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Local storm report, Apr 6, 4:46 PM CDT, 1 hour 55 minutes before

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Local storm report, Apr 6, 4:47 PM CDT, 1 hour 54 minutes before

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Local storm report, Apr 6, 5:09 PM CDT, 1 hour 32 minutes before

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Special weather statement, Apr 6, 5:53 PM CDT, 48 minutes before

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Local storm report, Apr 6, 6:10 PM CDT, 31 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 7:31 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Marshall, Riley, Washington	29 min
Apr 5, 7:43 PM CDT	Severe Thunderstorm Warning	TOP	Brown, Nemaha	18 min
Apr 5, 7:53 PM CDT	Severe Thunderstorm Warning	TOP	Marshall	37 min
Apr 5, 8:08 PM CDT	Severe Thunderstorm Warning	TOP	Washington	52 min
Apr 5, 8:26 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Republic, Washington	34 min
Apr 5, 8:44 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Washington	31 min
Apr 5, 8:58 PM CDT	Tornado Warning	TOP	Washington	32 min
Apr 5, 9:13 PM CDT	Severe Thunderstorm Warning	TOP	Marshall	17 min
Apr 5, 9:18 PM CDT	Tornado Warning	TOP	Marshall, Washington	27 min
Apr 5, 9:38 PM CDT	Severe Thunderstorm Warning	TOP	Marshall	11 min
Apr 6, 2:38 PM CDT	Severe Thunderstorm Warning	TOP	Lyon, Morris, Osage, Wabaunsee	37 min
Apr 6, 3:04 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Jefferson, Osage, Shawnee, Wabaunsee	41 min
Apr 6, 3:14 PM CDT	Severe Thunderstorm Warning	TOP	Lyon, Morris, Osage, Wabaunsee	46 min
Apr 6, 3:43 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Jefferson, Osage, Shawnee, Wabaunsee	47 min
Apr 6, 3:47 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Franklin, Lyon, Osage	43 min
Apr 6, 4:09 PM CDT	Areal Flood Advisory	TOP	Lyon	111 min
Apr 6, 4:24 PM CDT	Areal Flood Advisory	TOP	Douglas	81 min
Apr 6, 4:28 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Jefferson	22 min
Apr 6, 4:52 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Franklin, Lyon, Osage, Shawnee	38 min
Apr 6, 5:29 PM CDT	Areal Flood Advisory	TOP	Lyon	2 hr

Nearby

Severe Thunderstorm Warnings in Kansas, 2010 Every severe thunderstorm warning in 2010

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.