Alert archive / Iowa / Flash Flood Watches in 2020

Flash Flood Watch 3, NWS Des Moines, IA

June 8, 202039 counties in Iowa

NWS Des Moines, IA issued this flash flood watch at Jun 8, 2020, 3:42 AM CDT for 39 counties in Iowa. It took effect at Jun 9, 2020, 7:00 AM CDT. It was in force for 30 hr.

The area

The counties it named.

The facts

Issued: Jun 8, 2020, 3:42 AM CDT (08:42 UTC)
In effect from: Jun 9, 2020, 7:00 AM CDT
Expired: Jun 10, 2020, 1:00 PM CDT
In force: 30 hr
Issued by: NWS Des Moines, IA
Flood severity: None

All 39 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Cass County, IA, Cerro Gordo County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Franklin County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 24 km from the middle of the area, began a volume at 08:43 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

Minneapolis, MN (KMPX), launched 00:00Z, 8.7 hours before the alert went out and 343 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: 196 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 2143 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Des Moines, IA wrote its last area forecast discussion before this flash flood watch went out at Jun 8, 3:27 AM CDT, 15 minutes earlier.

Area forecast discussion, Jun 8, 3:27 AM CDT, 15 minutes before

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Nearby

Flash Flood Watches in Iowa, 2020 Every flash flood watch 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.