Alert archive / Illinois / Flash Flood Watches in 2021
Flash Flood Watch 4, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood watch at Aug 12, 2021, 12:44 PM CDT for 4 counties in Illinois; Des Moines County, Lee County, Van Buren County, Iowa; Clark County, Scotland County, Missouri. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Aug 12, 2021, 12:44 PM CDT (17:44 UTC)
- Expired
- Aug 12, 2021, 9:08 PM CDT
- In force
- 8 hr
- Issued by
- NWS Quad Cities, IA
- Flood severity
- None
Counties Des Moines County, IA, Lee County, IA, Van Buren County, IA, Hancock County, IL, Henderson County, IL, McDonough County, IL, Warren County, IL, Clark County, MO, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 125 km from the middle of the area, began a volume at 17:43 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, 5.7 hours before the alert went out and 129 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2463 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
941 WGUS63 KDVN 121744 FFADVN URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Quad Cities IA IL 1244 PM CDT Thu Aug 12 2021 IAZ089-098-099-ILZ025-026-034-035-MOZ009-010-130145- /O.NEW.KDVN.FF.A.0004.210812T1744Z-210813T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Des Moines-Van Buren-Lee-Henderson-Warren-Hancock-McDonough-Scotland- Clark- Including the cities of Carthage, Monmouth, Kahoka, Oquawka, Macomb, Keosauqua, Burlington, Fort Madison, and Memphis 1244 PM CDT Thu Aug 12 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH FRIDAY MORNING... The National Weather Service in Quad Cities has issued a * Flash Flood Watch for portions of west central Illinois, southeast Iowa and northeast Missouri, including the following areas, in west central Illinois, Hancock, Henderson, McDonough and Warren. In southeast Iowa, Des Moines, Lee and Van Buren. In northeast Missouri, Clark and Scotland. * Through Friday morning. * Torrential rainfall from storms this morning will continue into the afternoon and sink south into Missouri and central Illinois. However, an approaching cold front is expected to bring additional storms, with more heavy rainfall. This next round of storms will continue the threat for flash flooding into the night time hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Ervin
2 follow-up statements
083 WGUS63 KDVN 122355 FFADVN Flood Watch National Weather Service Quad Cities IA IL 655 PM CDT Thu Aug 12 2021 IAZ089-098-099-ILZ025-026-034-035-MOZ009-010-130800- /O.CON.KDVN.FF.A.0004.000000T0000Z-210813T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Des Moines-Van Buren-Lee-Henderson-Warren-Hancock-McDonough-Scotland- Clark- Including the cities of Carthage, Monmouth, Kahoka, Oquawka, Macomb, Keosauqua, Burlington, Fort Madison, and Memphis 655 PM CDT Thu Aug 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH FRIDAY MORNING... The Flash Flood Watch continues for * Portions of west central Illinois, southeast Iowa and northeast Missouri, including the following areas, in west central Illinois, Hancock, Henderson, McDonough and Warren. In southeast Iowa, Des Moines, Lee and Van Buren. In northeast Missouri, Clark and Scotland. * Through Friday morning. * Between 2 and 5 inches of rain has fallen over the past 24 hours. Scattered thunderstorms are possible overnight along a cold front which may bring heavy rainfall and a threat for flash flooding. However, the coverage of storms may remain low which would limit the potential for additional flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Uttech
414 WGUS63 KDVN 130208 FFADVN Flood Watch National Weather Service Quad Cities IA IL 908 PM CDT Thu Aug 12 2021 IAZ089-098-099-ILZ025-026-034-035-MOZ009-010-130315- /O.CAN.KDVN.FF.A.0004.000000T0000Z-210813T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Des Moines-Van Buren-Lee-Henderson-Warren-Hancock-McDonough-Scotland- Clark- Including the cities of Carthage, Monmouth, Kahoka, Oquawka, Macomb, Keosauqua, Burlington, Fort Madison, and Memphis 908 PM CDT Thu Aug 12 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of west central Illinois, southeast Iowa and northeast Missouri, including the following areas, in west central Illinois, Hancock, Henderson, McDonough and Warren. In southeast Iowa, Des Moines, Lee and Van Buren. In northeast Missouri, Clark and Scotland has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a significant threat. Although isolated thunderstorms remain possible through the night, the risk for widespread heavy rainfall has decreased. Please continue to heed remaining road closures. $$ Uttech
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 8:34 PM CDT | Special Weather Statement | DVN | Bureau | 26 min |
| Aug 12, 2:39 AM CDT | Special Weather Statement | DVN | Henderson | 36 min |
| Aug 12, 2:43 AM CDT | Special Weather Statement | DVN | Putnam | 32 min |
| Aug 12, 2:57 AM CDT | Heat Advisory | DVN | Hancock, McDonough | 8 hr |
| Aug 12, 2:59 AM CDT | Special Weather Statement | DVN | Henderson, Warren | 31 min |
| Aug 12, 9:54 AM CDT | Special Weather Statement | DVN | Hancock, Henderson, McDonough | 96 min |
| Aug 12, 11:10 AM CDT | Special Weather Statement | DVN | Putnam | 35 min |
| Aug 12, 11:29 AM CDT | Special Weather Statement | DVN | Hancock, McDonough | 91 min |
| Aug 12, 12:55 PM CDT | Special Weather Statement | DVN | Hancock, McDonough | 95 min |
| Aug 12, 1:39 PM CDT | River Flood Watch | DVN | Hancock, McDonough | 8 hr |
| Aug 12, 2:09 AM CDT | Special Weather Statement | DVN | Lee | 21 min |
| Aug 12, 7:24 AM CDT | Special Weather Statement | DVN | Van Buren | 36 min |
| Aug 12, 7:26 AM CDT | Severe Thunderstorm Warning | DVN | Van Buren | 33 min |
| Aug 12, 9:10 AM CDT | Special Weather Statement | DVN | Van Buren | 50 min |
| Aug 12, 9:23 AM CDT | Flash Flood Warning | DVN | Van Buren | 4 hr |
| Aug 12, 10:32 AM CDT | Flash Flood Warning | DVN | Lee, Van Buren | 6 hr |
| Aug 12, 8:35 AM CDT | Special Weather Statement | DVN | Scotland | 25 min |
| Aug 12, 2:29 PM CDT | Flash Flood Warning | DVN | Scotland | 4 hr |
Nearby
Flash Flood Watches in Illinois, 2021Flash Flood Watches in Iowa, 2021Flash Flood Watches in Missouri, 2021Every flash flood watch in 2021
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.