Alert archive / Iowa / Flash Flood Watches in 2021
Flash Flood Watch 5, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood watch at Aug 12, 2021, 1:30 PM CDT for Appanoose County, Davis County, Iowa. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Aug 12, 2021, 1:30 PM CDT (18:30 UTC)
- Expired
- Aug 12, 2021, 8:13 PM CDT
- In force
- 7 hr
- Issued by
- NWS Des Moines, IA
- Flood severity
- None
Counties Appanoose County, IA, Davis County, IA
The radar
The Des Moines radar (KDMX), 142 km from the middle of the area, began a volume at 18:32 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, 6.5 hours before the alert went out and 204 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.
301 WGUS63 KDMX 121830 FFADMX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Des Moines IA 130 PM CDT Thu Aug 12 2021 IAZ096-097-130230- /O.NEW.KDMX.FF.A.0005.210812T1830Z-210813T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Appanoose-Davis- Including the cities of Centerville and Bloomfield 130 PM CDT Thu Aug 12 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH FRIDAY MORNING... The National Weather Service in Des Moines has issued a * Flash Flood Watch for portions of south central Iowa and southeast Iowa, including the following areas, in south central Iowa, Appanoose. In southeast Iowa, Davis. * Through Friday morning. * Heavy rainfall of 2 to 5 inches fell over portions of the watch area Thursday morning. Additional thunderstorms and heavy rainfall are possible Thursday evening through early Friday morning which may lead to flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Martin
2 follow-up statements
970 WGUS63 KDMX 122214 FFADMX Flood Watch National Weather Service Des Moines IA 514 PM CDT Thu Aug 12 2021 IAZ096-097-130615- /O.CON.KDMX.FF.A.0005.000000T0000Z-210813T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Appanoose-Davis- Including the cities of Centerville and Bloomfield 514 PM CDT Thu Aug 12 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH FRIDAY MORNING... The Flash Flood Watch continues for * Portions of south central Iowa and southeast Iowa, including the following areas, in south central Iowa, Appanoose. In southeast Iowa, Davis. * Through Friday morning. * 2 To 5 inches of rainfall occurred throughout the area this morning. If additional thunderstorms produce heavy rainfall again, Flash Flooding is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Krull
368 WGUS63 KDMX 130113 FFADMX Flood Watch National Weather Service Des Moines IA 813 PM CDT Thu Aug 12 2021 IAZ096-097-130215- /O.CAN.KDMX.FF.A.0005.000000T0000Z-210813T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Appanoose-Davis- Including the cities of Centerville and Bloomfield 813 PM CDT Thu Aug 12 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of south central Iowa and southeast Iowa, including the following areas, in south central Iowa, Appanoose. In southeast Iowa, Davis has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ Krull
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 4:30 AM CDT | Special Weather Statement | DMX | Decatur | 30 min |
| Aug 12, 4:58 AM CDT | Special Weather Statement | DMX | Decatur | 47 min |
| Aug 12, 7:38 AM CDT | Special Weather Statement | DMX | Davis | 52 min |
| Aug 12, 11:12 AM CDT | Flash Flood Warning | DMX | Appanoose, Davis | 3 hr |
Nearby
Flash Flood Watches in Iowa, 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.