Alert archive / Iowa / Flash Flood Warnings in 2023

Flash Flood Warning 11, NWS Quad Cities, IA

August 14, 2023Dubuque County, Iowa

NWS Quad Cities, IA issued this flash flood warning at Aug 14, 2023, 4:39 PM CDT for Dubuque County, Iowa. It was in force for 2 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
Aug 14, 2023, 4:39 PM CDT (21:39 UTC)
Expired
Aug 14, 2023, 7:01 PM CDT
In force
2 hr
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Flood severity
None

County Dubuque County, IA

The radar

The Quad Cities radar (KDVN), 99 km from the middle of the area, began a volume at 21:42 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.7 hours before the alert went out and 317 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2023-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2023-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
903 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
99 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 Aug 14, 1:52 PM CDT, 2 hours 47 minutes earlier.

Area forecast discussion, Aug 14, 1:52 PM CDT, 2 hours 47 minutes before
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Hazardous weather outlook, Aug 14, 12:36 PM CDT, 4 hours 3 minutes before
Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
1236 PM CDT Mon Aug 14 2023

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-151100-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
1236 PM CDT Mon Aug 14 2023

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast
Missouri.

.DAY ONE...THIS AFTERNOON AND TONIGHT

The chance for an isolated severe storm capable of producing a
tornado will continue through mid afternoon mainly in northwest
Illinois. For other areas especially along and north of
Interstate 80, conditions may be favorable for funnel clouds and
possibly weak, brief tornadoes this afternoon.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon.

GENERAL STORM MOTION OF THE DAY:

Moving toward the northeast around 30 mph.

12

In the hours before

Special weather statement, Aug 14, 3:17 PM CDT, 1 hour 22 minutes before
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Special weather statement, Aug 14, 3:25 PM CDT, 1 hour 14 minutes before
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Special weather statement, Aug 14, 3:44 PM CDT, 55 minutes before
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Special weather statement, Aug 14, 4:14 PM CDT, 25 minutes before
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Local storm report, Aug 14, 4:30 PM CDT, 9 minutes before
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Local storm report, Aug 14, 4:34 PM CDT, 5 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 1:50 PM CDTSpecial Weather StatementDVNDubuque, Jackson40 min
Aug 14, 2:49 PM CDTSpecial Weather StatementDVNDelaware41 min
Aug 14, 2:57 PM CDTSpecial Weather StatementDVNJackson48 min
Aug 14, 3:44 PM CDTSpecial Weather StatementDVNDelaware46 min
Aug 14, 4:14 PM CDTSpecial Weather StatementDVNDubuque61 min
Aug 14, 1:42 PM CDTSpecial Weather StatementDVNStephenson48 min
Aug 14, 1:47 PM CDTSevere Thunderstorm WarningDVNStephenson28 min
Aug 14, 3:17 PM CDTSpecial Weather StatementDVNCarroll43 min
Aug 14, 3:25 PM CDTSpecial Weather StatementDVNWhiteside50 min
Aug 14, 3:29 PM CDTSevere Thunderstorm WarningDVNCarroll, Whiteside46 min

Nearby

Flash Flood Warnings in Iowa, 2023Every flash flood warning in 2023

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.