Alert archive / Illinois / Flash Flood Warnings in 2025

Flash Flood Warning 26, NWS Quad Cities, IA

July 20, 2025Bureau County, Illinois

NWS Quad Cities, IA issued this flash flood warning at Jul 20, 2025, 10:07 AM CDT for Bureau County, Illinois. It was in force for 51 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 20, 2025, 10:07 AM CDT (15:07 UTC)
Expired
Jul 20, 2025, 10:58 AM CDT
In force
51 min
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Flood severity
None

County Bureau County, IL

The radar

The Quad Cities radar (KDVN), 91 km from the middle of the area, began a volume at 15:07 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

Lincoln, IL (KILX), launched 12:00Z, 3.1 hours before the alert went out and 160 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, Lincoln, IL at 12:00Z on 2025-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1688 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, Lincoln, IL at 12:00Z on 2025-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.193958Sfc1 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
1688 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
772 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.5

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 1:19 AM CDTSpecial Weather StatementDVNIowa41 min
Jul 20, 1:37 AM CDTSpecial Weather StatementDVNVan Buren53 min
Jul 20, 3:11 AM CDTFlash Flood WarningDVNKeokuk, Louisa, Muscatine, Washington6 hr
Jul 20, 3:53 AM CDTSpecial Weather StatementDVNLouisa52 min
Jul 20, 4:54 AM CDTSpecial Weather StatementDVNScott51 min
Jul 20, 4:58 AM CDTSpecial Weather StatementDVNScott47 min
Jul 20, 5:16 AM CDTFlash Flood WarningDVNIowa, Keokuk4 hr
Jul 20, 6:40 AM CDTFlash Flood WarningDVNBenton, Iowa4 hr
Jul 20, 10:10 AM CDTRiver Flood WarningDVNJohnson, Washington60 hr
Jul 20, 10:21 AM CDTRiver Flood WarningDVNKeokuk3 days
Jul 20, 4:17 PM CDTSpecial Weather StatementDVNClinton43 min
Jul 20, 4:13 AM CDTSpecial Weather StatementDVNMercer47 min
Jul 20, 9:44 AM CDTSpecial Weather StatementDVNBureau76 min

Nearby

Flash Flood Warnings in Illinois, 2025Every flash flood warning in 2025

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.