Alert archive / Iowa / Flash Flood Watches in 2019

Flash Flood Watch 5, NWS Des Moines, IA

May 25, 201914 counties in Iowa

NWS Des Moines, IA issued this flash flood watch at May 25, 2019, 4:34 AM CDT for 14 counties in Iowa. It took effect at May 25, 2019, 4:00 PM CDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: May 25, 2019, 4:34 AM CDT (09:34 UTC)
In effect from: May 25, 2019, 4:00 PM CDT
Expired: May 26, 2019, 7:00 AM CDT
In force: 15 hr
Issued by: NWS Des Moines, IA
Flood severity: None

Counties Adams County, IA, Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 90 km from the middle of the area, began a volume at 09:34 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 00:00Z, 9.6 hours before the alert went out and 247 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: 1850 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 150 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 May 25, 4:26 AM CDT, 8 minutes earlier.

Area forecast discussion, May 25, 4:26 AM CDT, 8 minutes before

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Hazardous weather outlook, May 25, 4:16 AM CDT, 18 minutes before

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In the hours before

Special weather statement, May 24, 11:32 PM CDT, 5 hours 2 minutes before

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<body>
  <main class="wrap">
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      <div class="status" id="status">Temporary Notice</div>
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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
May 25, 6:49 PM CDT	River Flood Warning	DMX	Madison, Warren	25 hr

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.