Alert archive / Kansas / Flash Flood Watches in 2009

Flash Flood Watch 2, NWS Topeka, KS

April 29, 200912 counties in Kansas

NWS Topeka, KS issued this flash flood watch at Apr 29, 2009, 3:57 AM CDT for 12 counties in Kansas. It took effect at Apr 29, 2009, 10:42 AM CDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Apr 29, 2009, 3:57 AM CDT (08:57 UTC)
In effect from
Apr 29, 2009, 10:42 AM CDT
Expired
Apr 29, 2009, 3:41 PM CDT
In force
5 hr
Issued by
NWS Topeka, KS
Flood severity
None

Counties Anderson County, KS, Coffey County, KS, Dickinson County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Jefferson County, KS, Lyon County, KS, Morris County, KS, Osage County, KS, Shawnee County, KS, Wabaunsee County, KS

The radar

The Topeka radar (KTWX), 38 km from the middle of the area, began a volume at 09:00 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

Lamont, OK (KLMN), launched 00:00Z, 9.0 hours before the alert went out and 271 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, Lamont, OK at 00:00Z on 2009-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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, Lamont, OK at 00:00Z on 2009-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
552 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
57 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
Apr 29, 11:06 AM CDTAreal Flood WarningTOPAnderson, Coffey, Douglas, Franklin, Jefferson, Osage and 1 more3 hr
Apr 29, 1:59 PM CDTAreal Flood WarningTOPAnderson, Coffey, Douglas, Franklin3 hr
Apr 29, 5:40 PM CDTRiver Flood WarningTOPAnderson, Franklin29 hr
Apr 29, 5:40 PM CDTRiver Flood WarningTOPFranklin, Osage22 hr

Nearby

Flash Flood Watches in Kansas, 2009Every flash flood watch in 2009

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.