Alert archive / Iowa / Flash Flood Warnings in 2024

Flash Flood Warning 16, NWS Quad Cities, IA

July 10, 2024Johnson County, Iowa

NWS Quad Cities, IA issued this flash flood warning at Jul 10, 2024, 5:45 PM CDT for Johnson County, Iowa. It was in force for 88 min. 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 10, 2024, 5:45 PM CDT (22:45 UTC)
Expired: Jul 10, 2024, 7:13 PM CDT
In force: 88 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Flood severity: None

County Johnson County, IA

The radar

The Quad Cities radar (KDVN), 84 km from the middle of the area, began a volume at 22:48 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

Davenport, (KDVN), launched 12:00Z, 10.8 hours before the alert went out and 91 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: 370 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1250 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 55 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before this flash flood warning went out at Jul 10, 3:26 PM CDT, 2 hours 19 minutes earlier.

Area forecast discussion, Jul 10, 3:26 PM CDT, 2 hours 19 minutes before

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Hazardous weather outlook, Jul 10, 2:57 PM CDT, 2 hours 48 minutes before

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In the hours before

Special weather statement, Jul 10, 3:59 PM CDT, 1 hour 46 minutes before

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Special weather statement, Jul 10, 4:00 PM CDT, 1 hour 45 minutes before

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Special weather statement, Jul 10, 4:35 PM CDT, 1 hour 10 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Special weather statement, Jul 10, 4:55 PM CDT, 50 minutes before

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      <p id="message2">
        Please try again in a few minutes.
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Special weather statement, Jul 10, 5:12 PM CDT, 33 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, Jul 10, 5:26 PM CDT, 19 minutes before

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  <main class="wrap">
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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 10, 1:11 PM CDT	Special Weather Statement	DVN	Buchanan	49 min
Jul 10, 2:13 PM CDT	Special Weather Statement	DVN	Delaware, Dubuque	62 min
Jul 10, 3:18 PM CDT	Special Weather Statement	DVN	Scott	42 min
Jul 10, 3:40 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Muscatine	50 min
Jul 10, 3:57 PM CDT	Special Weather Statement	DVN	Scott	48 min
Jul 10, 3:59 PM CDT	Special Weather Statement	DVN	Van Buren	46 min
Jul 10, 4:00 PM CDT	Special Weather Statement	DVN	Benton	45 min
Jul 10, 4:35 PM CDT	Special Weather Statement	DVN	Van Buren	40 min
Jul 10, 4:55 PM CDT	Special Weather Statement	DVN	Johnson	50 min
Jul 10, 5:26 PM CDT	Special Weather Statement	DVN	Lee	49 min
Jul 10, 3:47 PM CDT	Special Weather Statement	DVN	Stephenson	43 min
Jul 10, 5:12 PM CDT	Special Weather Statement	DVN	Rock Island	48 min
Jul 10, 5:49 PM CDT	Special Weather Statement	DVN	Hancock	41 min
Jul 10, 6:24 PM CDT	Special Weather Statement	DVN	McDonough	66 min
Jul 10, 3:49 PM CDT	Severe Thunderstorm Warning	DVN	Scotland	36 min

Nearby

Flash Flood Warnings in Iowa, 2024 Every flash flood warning in 2024

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.