Alert archive / Iowa / Flash Flood Watches in 2018

Flash Flood Watch 1, NWS Quad Cities, IA

June 9, 201811 counties in Iowa; 8 counties in Illinois

NWS Quad Cities, IA issued this flash flood watch at Jun 9, 2018, 3:01 PM CDT for 11 counties in Iowa; 8 counties in Illinois. It took effect at Jun 9, 2018, 5:00 PM CDT. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued: Jun 9, 2018, 3:01 PM CDT (20:01 UTC)
In effect from: Jun 9, 2018, 5:00 PM CDT
Expired: Jun 10, 2018, 7:00 AM CDT
In force: 14 hr
Issued by: NWS Quad Cities, IA
Flood severity: None

Counties Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Muscatine County, IA, Scott County, IA, Bureau County, IL, Carroll County, IL, Henry County, IL, Jo Daviess County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 35 km from the middle of the area, began a volume at 20:04 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, 8.0 hours before the alert went out and 36 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: 298 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 1110 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.3

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 Quad Cities, IA wrote its last area forecast discussion before this flash flood watch went out at Jun 9, 12:07 PM CDT, 2 hours 54 minutes earlier.

Area forecast discussion, Jun 9, 12:07 PM CDT, 2 hours 54 minutes before

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Hazardous weather outlook, Jun 9, 1:10 PM CDT, 1 hour 51 minutes before

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In the hours before

Local storm report, Jun 9, 12:02 PM CDT, 2 hours 59 minutes before

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Local storm report, Jun 9, 12:06 PM CDT, 2 hours 55 minutes before

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Local storm report, Jun 9, 12:42 PM CDT, 2 hours 19 minutes before

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Local storm report, Jun 9, 12:53 PM CDT, 2 hours 8 minutes before

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Local storm report, Jun 9, 1:00 PM CDT, 2 hours 1 minute before

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      <p id="message2">
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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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Local storm report, Jun 9, 1:09 PM CDT, 1 hour 52 minutes before

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      <p id="message1">
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      </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
Jun 8, 10:11 PM CDT	Special Weather Statement	DVN	Muscatine	64 min
Jun 8, 11:00 PM CDT	Special Weather Statement	DVN	Cedar	60 min
Jun 8, 11:01 PM CDT	Special Weather Statement	DVN	Scott	59 min
Jun 9, 2:18 AM CDT	Special Weather Statement	DVN	Clinton, Jackson	27 min
Jun 9, 4:21 AM CDT	Flash Flood Warning	DVN	Clinton, Jackson	6 hr
Jun 9, 4:28 AM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	47 min
Jun 9, 5:03 AM CDT	Special Weather Statement	DVN	Jackson	42 min
Jun 9, 6:39 AM CDT	Special Weather Statement	DVN	Johnson	51 min
Jun 9, 7:00 AM CDT	Flash Flood Warning	DVN	Jackson	3 hr
Jun 9, 7:23 AM CDT	Special Weather Statement	DVN	Johnson	37 min
Jun 9, 7:57 AM CDT	Special Weather Statement	DVN	Washington	48 min
Jun 9, 8:02 AM CDT	Special Weather Statement	DVN	Johnson	43 min
Jun 9, 8:18 AM CDT	Special Weather Statement	DVN	Henry	42 min
Jun 9, 8:39 AM CDT	Flash Flood Warning	DVN	Linn	2 hr
Jun 9, 8:41 AM CDT	Special Weather Statement	DVN	Linn	49 min
Jun 9, 8:47 AM CDT	Severe Thunderstorm Warning	DVN	Johnson, Linn	42 min
Jun 9, 9:12 AM CDT	Special Weather Statement	DVN	Henry	48 min
Jun 9, 9:32 AM CDT	Special Weather Statement	DVN	Delaware, Johnson, Jones	43 min
Jun 9, 9:57 AM CDT	Special Weather Statement	DVN	Des Moines, Henry	48 min
Jun 8, 7:29 PM CDT	Special Weather Statement	DVN	Jo Daviess, Stephenson	61 min
Jun 8, 8:46 PM CDT	Special Weather Statement	DVN	Jo Daviess	59 min
Jun 9, 12:08 AM CDT	Special Weather Statement	DVN	Mercer	37 min
Jun 9, 12:16 AM CDT	Severe Thunderstorm Warning	DVN	Rock Island	44 min
Jun 9, 12:43 AM CDT	Flash Flood Warning	DVN	Rock Island	2 hr
Jun 9, 5:02 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry, Whiteside	43 min
Jun 9, 10:06 AM CDT	Special Weather Statement	DVN	Warren	39 min
Jun 9, 10:39 AM CDT	Special Weather Statement	DVN	Hancock, Henderson, McDonough, Warren	66 min
Jun 9, 11:11 AM CDT	Special Weather Statement	DVN	McDonough	64 min
Jun 9, 11:45 AM CDT	Severe Thunderstorm Warning	DVN	McDonough	20 min
Jun 9, 11:47 AM CDT	Special Weather Statement	DVN	McDonough	43 min

Nearby

Flash Flood Watches in Iowa, 2018 Flash Flood Watches in Illinois, 2018 Every flash flood watch in 2018

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.