Alert archive / Iowa / Areal Flood Warnings in 2017

Areal Flood Warning 2, NWS Des Moines, IA

July 22, 2017Bremer County, Iowa

NWS Des Moines, IA issued this areal flood warning at Jul 22, 2017, 2:19 PM CDT for Bremer County, Iowa. It was in force for 24 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 22, 2017, 2:19 PM CDT (19:19 UTC)
Expired: Jul 23, 2017, 2:15 PM CDT
In force: 24 hr
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

County Bremer County, IA

The radar

The La Crosse radar (KARX), 148 km from the middle of the area, began a volume at 19:25 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 12:00Z, 7.3 hours before the alert went out and 253 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: 292 J/kg
Mixed-layer CIN: -284 J/kg
Mixed-layer LCL: 1216 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 17 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 areal flood warning 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 areal flood warning went out at Jul 21, 6:23 PM CDT, 19 hours 56 minutes earlier.

Area forecast discussion, Jul 21, 6:23 PM CDT, 19 hours 56 minutes before

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Hazardous weather outlook, Jul 21, 5:15 PM CDT, 21 hours 4 minutes before

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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 21, 9:58 PM CDT	Special Weather Statement	DMX	Bremer	62 min
Jul 21, 10:24 PM CDT	Flash Flood Warning	DMX	Bremer	15 hr
Jul 22, 2:04 AM CDT	Flash Flood Warning	DMX	Black Hawk, Bremer, Butler	6 hr
Jul 22, 3:59 AM CDT	Heat Advisory	DMX	Audubon, Cass, Guthrie	16 hr
Jul 22, 7:56 AM CDT	Areal Flood Warning	DMX	Bremer	24 hr

Nearby

Areal Flood Warnings in Iowa, 2017 Every areal flood warning in 2017

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.