Alert archive / Missouri / Flash Flood Watches in 2009

Flash Flood Watch 6, NWS Kansas City, MO

April 30, 200914 counties in Missouri; 6 counties in Kansas

NWS Kansas City, MO issued this flash flood watch at Apr 30, 2009, 8:24 AM CDT for 14 counties in Missouri; 6 counties in Kansas. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Apr 30, 2009, 8:24 AM CDT (13:24 UTC)
Expired: Apr 30, 2009, 3:59 PM CDT
In force: 8 hr
Issued by: NWS Kansas City, MO
Flood severity: None

Counties Atchison County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Wyandotte County, KS, Bates County, MO, Carroll County, MO, Cass County, MO, Clay County, MO, Cooper County, MO, Henry County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Pettis County, MO, Platte County, MO, Ray County, MO, Saline County, MO

The radar

The Pleasant Hill radar (KEAX), 19 km from the middle of the area, began a volume at 13:27 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

Springfield, MO (KSGF), launched 12:00Z, 1.4 hours before the alert went out and 230 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: 512 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 90 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 Kansas City, MO wrote its last area forecast discussion before this flash flood watch went out at Apr 30, 4:57 AM CDT, 3 hours 27 minutes earlier.

Area forecast discussion, Apr 30, 4:57 AM CDT, 3 hours 27 minutes before

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Hazardous weather outlook, Apr 30, 6:06 AM CDT, 2 hours 18 minutes before

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The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 29, 9:58 PM CDT	Areal Flood Advisory	EAX	Chariton, Saline	6 hr
Apr 29, 10:10 PM CDT	River Flood Warning	EAX	Cooper	40 hr
Apr 29, 10:36 PM CDT	Areal Flood Advisory	EAX	Cooper, Howard, Macon, Randolph	6 hr
Apr 29, 10:46 PM CDT	Areal Flood Advisory	EAX	Cooper, Howard, Saline	6 hr
Apr 29, 11:45 PM CDT	Areal Flood Advisory	EAX	Cooper, Pettis	9 hr
Apr 29, 11:54 PM CDT	River Flood Warning	EAX	Howard	20 hr
Apr 30, 1:55 AM CDT	Areal Flood Warning	EAX	Chariton, Cooper, Howard, Macon, Randolph, Saline	7 hr
Apr 30, 3:03 AM CDT	River Flood Warning	EAX	Cooper	17 hr
Apr 30, 7:41 AM CDT	Areal Flood Advisory	EAX	Cass, Clay, Jackson, Platte	4 hr
Apr 30, 10:39 AM CDT	Flash Flood Warning	EAX	Clay, Jackson, Platte	90 min
Apr 30, 6:01 PM CDT	Special Weather Statement	EAX	Jackson	29 min

Nearby

Flash Flood Watches in Missouri, 2009 Flash Flood Watches in Kansas, 2009 Every 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.