Alert archive / Kansas / Flash Flood Watches in 2019

Flash Flood Watch 8, NWS Topeka, KS

July 31, 201923 counties in Kansas

NWS Topeka, KS issued this flash flood watch at Jul 31, 2019, 3:26 PM CDT for 23 counties in Kansas. It took effect at Aug 1, 2019, 12:00 AM CDT. It was in force for 51 hr.

The area

The counties it named.

The facts

Issued: Jul 31, 2019, 3:26 PM CDT (20:26 UTC)
In effect from: Aug 1, 2019, 12:00 AM CDT
Expired: Aug 3, 2019, 3:12 AM CDT
In force: 51 hr
Issued by: NWS Topeka, KS
Flood severity: None

All 23 counties

Anderson County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Coffey County, KS, Dickinson County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Lyon County, KS, Marshall County, KS, Morris County, KS, Nemaha County, KS, Osage County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS

The radar

The Topeka radar (KTWX), 16 km from the middle of the area, began a volume at 20:29 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 12:00Z, 8.4 hours before the alert went out and 61 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1772 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -26 m²/s²
0-3 km storm-relative helicity: 346 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jul 31, 12:48 PM CDT, 2 hours 38 minutes earlier.

Area forecast discussion, Jul 31, 12:48 PM CDT, 2 hours 38 minutes before

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Hazardous weather outlook, Jul 31, 5:06 AM CDT, 10 hours 20 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 31, 1:26 AM CDT	Special Weather Statement	TOP	Shawnee	34 min
Jul 31, 3:27 AM CDT	Areal Flood Advisory	TOP	Osage, Shawnee	2 hr

Nearby

Flash Flood Watches in Kansas, 2019 Every flash flood watch in 2019

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.