Alert archive / Iowa / Flash Flood Watches in 2019

Flash Flood Watch 8, NWS Des Moines, IA

June 21, 20196 counties in Iowa

NWS Des Moines, IA issued this flash flood watch at Jun 21, 2019, 3:37 PM CDT for 6 counties in Iowa. It took effect at Jun 21, 2019, 7:00 PM CDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jun 21, 2019, 3:37 PM CDT (20:37 UTC)
In effect from: Jun 21, 2019, 7:00 PM CDT
Expired: Jun 22, 2019, 7:00 AM CDT
In force: 12 hr
Issued by: NWS Des Moines, IA
Flood severity: None

Counties Appanoose County, IA, Davis County, IA, Decatur County, IA, Ringgold County, IA, Taylor County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 111 km from the middle of the area, began a volume at 20:39 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

Omaha, NE (KOAX), launched 12:00Z, 8.6 hours before the alert went out and 245 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: 5 J/kg
Mixed-layer CIN: -711 J/kg
Mixed-layer LCL: 1428 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 155 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 Des Moines, IA wrote its last area forecast discussion before this flash flood watch went out at Jun 21, 12:45 PM CDT, 2 hours 52 minutes earlier.

Area forecast discussion, Jun 21, 12:45 PM CDT, 2 hours 52 minutes before

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Hazardous weather outlook, Jun 21, 3:23 PM CDT, 14 minutes before

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In the hours before

Special weather statement, Jun 21, 9:50 AM CDT, 5 hours 47 minutes before

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Local storm report, Jun 21, 10:12 AM CDT, 5 hours 25 minutes before

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Local storm report, Jun 21, 10:42 AM CDT, 4 hours 55 minutes before

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Special weather statement, Jun 21, 11:30 AM CDT, 4 hours 7 minutes before

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Local storm report, Jun 21, 12:02 PM CDT, 3 hours 35 minutes before

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Special weather statement, Jun 21, 12:49 PM CDT, 2 hours 48 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
Jun 20, 8:43 PM CDT	Severe Thunderstorm Warning	DMX	Kossuth, Winnebago	28 min
Jun 21, 4:14 AM CDT	Special Weather Statement	DMX	Carroll	31 min
Jun 21, 4:17 AM CDT	Special Weather Statement	DMX	Dallas	28 min
Jun 21, 4:37 AM CDT	Special Weather Statement	DMX	Sac	23 min
Jun 21, 4:46 AM CDT	Severe Thunderstorm Warning	DMX	Monroe	44 min
Jun 21, 5:18 AM CDT	Special Weather Statement	DMX	Adair, Adams, Cass, Taylor	57 min
Jun 21, 5:21 AM CDT	Special Weather Statement	DMX	Boone	24 min
Jun 21, 5:50 AM CDT	Special Weather Statement	DMX	Boone	55 min
Jun 21, 6:38 AM CDT	Special Weather Statement	DMX	Dallas, Madison	52 min
Jun 21, 6:47 AM CDT	Special Weather Statement	DMX	Clarke, Decatur	43 min
Jun 21, 7:05 AM CDT	Special Weather Statement	DMX	Polk, Warren	55 min
Jun 21, 7:24 AM CDT	Flash Flood Warning	DMX	Boone, Calhoun, Greene, Sac, Webster	6 hr
Jun 21, 8:32 AM CDT	Special Weather Statement	DMX	Adams, Taylor	58 min
Jun 21, 8:54 AM CDT	Special Weather Statement	DMX	Clarke, Decatur, Madison, Ringgold, Union	66 min
Jun 21, 10:22 AM CDT	River Flood Watch	DMX	Polk	10 hr
Jun 21, 10:22 AM CDT	River Flood Watch	DMX	Dallas, Greene	43 hr
Jun 21, 10:24 AM CDT	River Flood Warning	DMX	Polk	5 days

Nearby

Flash Flood Watches in Iowa, 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.