Alert archive / Kansas / Areal Flood Warnings in 2020

Areal Flood Warning 13, NWS Topeka, KS

July 21, 2020Lyon County, Kansas

NWS Topeka, KS issued this areal flood warning at Jul 21, 2020, 6:40 AM CDT for Lyon County, Kansas. It was in force for 3 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: Jul 21, 2020, 6:40 AM CDT (11:40 UTC)
Expired: Jul 21, 2020, 9:30 AM CDT
In force: 3 hr
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Flood severity: None

County Lyon County, KS

The radar

The Topeka radar (KTWX), 61 km from the middle of the area, began a volume at 11:44 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 (KTOP), launched 00:00Z, 11.7 hours before the alert went out and 75 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: 879 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 1024 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood 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 areal flood warning went out at Jul 21, 5:59 AM CDT, 41 minutes earlier.

Area forecast discussion, Jul 21, 5:59 AM CDT, 41 minutes before

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Hazardous weather outlook, Jul 21, 3:52 AM CDT, 2 hours 48 minutes before

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In the hours before

Local storm report, Jul 21, 4:06 AM CDT, 2 hours 34 minutes before

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Local storm report, Jul 21, 4:25 AM CDT, 2 hours 15 minutes before

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Local storm report, Jul 21, 6:21 AM CDT, 19 minutes before

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Local storm report, Jul 21, 6:29 AM CDT, 11 minutes before

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Local storm report, Jul 21, 6:30 AM CDT, 10 minutes before

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Local storm report, Jul 21, 6:32 AM CDT, 8 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
Jul 20, 8:22 PM CDT	Special Weather Statement	TOP	Lyon	38 min
Jul 20, 8:32 PM CDT	Special Weather Statement	TOP	Dickinson	43 min
Jul 20, 8:52 PM CDT	Special Weather Statement	TOP	Lyon	38 min
Jul 20, 9:07 PM CDT	Severe Thunderstorm Warning	TOP	Lyon	38 min
Jul 20, 9:10 PM CDT	Severe Thunderstorm Warning	TOP	Dickinson, Ottawa	37 min
Jul 20, 9:13 PM CDT	Special Weather Statement	TOP	Osage	47 min
Jul 20, 9:18 PM CDT	Special Weather Statement	TOP	Morris	42 min
Jul 20, 9:32 PM CDT	Special Weather Statement	TOP	Dickinson	28 min
Jul 20, 9:35 PM CDT	Special Weather Statement	TOP	Lyon	40 min
Jul 20, 9:43 PM CDT	Severe Thunderstorm Warning	TOP	Lyon, Osage	47 min
Jul 20, 9:50 PM CDT	Special Weather Statement	TOP	Morris	25 min
Jul 20, 10:21 PM CDT	Areal Flood Advisory	TOP	Lyon, Osage	3 hr
Jul 20, 10:28 PM CDT	Special Weather Statement	TOP	Morris	32 min
Jul 20, 10:35 PM CDT	Special Weather Statement	TOP	Lyon	25 min
Jul 20, 11:04 PM CDT	Special Weather Statement	TOP	Jackson	26 min
Jul 20, 11:19 PM CDT	Special Weather Statement	TOP	Osage	26 min
Jul 20, 11:38 PM CDT	Flash Flood Warning	TOP	Lyon, Osage	4 hr
Jul 20, 11:47 PM CDT	Special Weather Statement	TOP	Jackson	28 min
Jul 21, 12:26 AM CDT	Special Weather Statement	TOP	Nemaha	34 min
Jul 21, 12:38 AM CDT	Flash Flood Warning	TOP	Jackson, Jefferson	4 hr
Jul 21, 12:57 AM CDT	Special Weather Statement	TOP	Coffey	33 min
Jul 21, 2:40 AM CDT	Flash Flood Warning	TOP	Lyon	4 hr
Jul 21, 3:26 AM CDT	Flash Flood Warning	TOP	Lyon, Osage	4 hr
Jul 21, 4:23 AM CDT	Areal Flood Warning	TOP	Jackson, Jefferson	3 hr
Jul 21, 4:33 AM CDT	Areal Flood Advisory	TOP	Coffey, Lyon, Osage	3 hr
Jul 21, 7:27 AM CDT	Areal Flood Warning	TOP	Lyon, Osage	3 hr
Jul 21, 9:38 AM CDT	Areal Flood Warning	TOP	Lyon	3 hr

Nearby

Areal Flood Warnings in Kansas, 2020 Every areal flood warning in 2020

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.