Alert archive / Iowa / Flash Flood Watches in 2021
Flash Flood Watch 4, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood watch at Jul 30, 2021, 3:19 PM CDT for 14 counties in Iowa. It took effect at Jul 31, 2021, 1:00 AM CDT. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Jul 30, 2021, 3:19 PM CDT (20:19 UTC)
- In effect from
- Jul 31, 2021, 1:00 AM CDT
- Expired
- Jul 31, 2021, 6:06 AM CDT
- In force
- 5 hr
- Issued by
- NWS Des Moines, IA
- Flood severity
- None
Counties Adair County, IA, Adams County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Decatur County, IA, Guthrie County, IA, Lucas County, IA, Madison County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 77 km from the middle of the area, began a volume at 20:20 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
Omaha, NE (KOAX), launched 12:00Z, 8.3 hours before the alert went out and 185 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
- 75 J/kg
- Mixed-layer CIN
- -269 J/kg
- Mixed-layer LCL
- 904 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 225 m²/s²
- 0-3 km storm-relative helicity
- 322 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 12.6
The text
As transmitted.
970 WGUS63 KDMX 302019 FFADMX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Des Moines IA 319 PM CDT Fri Jul 30 2021 IAZ057-058-070>073-081>084-092>095-310430- /O.NEW.KDMX.FF.A.0004.210731T0600Z-210731T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Audubon-Guthrie-Cass-Adair-Madison-Warren-Adams-Union-Clarke-Lucas- Taylor-Ringgold-Decatur-Wayne- Including the cities of Norwalk, Lenox, Audubon, Earlham, Fontanelle, Bayard, Mount Ayr, Allerton, Lamoni, Exira, Seymour, Panora, New Market, Casey, Atlantic, Corning, Bedford, Creston, Adair, Osceola, Stuart, Winterset, Greenfield, Guthrie Center, Chariton, Humeston, Leon, Corydon, Indianola, and Carlisle 319 PM CDT Fri Jul 30 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 1 AM CDT SATURDAY THROUGH SATURDAY MORNING... The National Weather Service in Des Moines has issued a * Flash Flood Watch for portions of south central Iowa, southwest Iowa and west central Iowa, including the following areas, in south central Iowa, Clarke, Decatur, Lucas, Madison, Ringgold, Union, Warren and Wayne. In southwest Iowa, Adair, Adams, Cass and Taylor. In west central Iowa, Audubon and Guthrie. * From 1 AM CDT Saturday through Saturday morning. * Heavy rainfall of 2 to 4 inches will be possible in the watch area. Local amounts to 5 inches will be possible. This could lead to localized flash flooding; especially in urban areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ REV
3 follow-up statements
300 WGUS63 KDMX 310201 FFADMX Flood Watch National Weather Service Des Moines IA 901 PM CDT Fri Jul 30 2021 IAZ057-058-070>073-081>084-092>095-311015- /O.CON.KDMX.FF.A.0004.210731T0600Z-210731T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Audubon-Guthrie-Cass-Adair-Madison-Warren-Adams-Union-Clarke-Lucas- Taylor-Ringgold-Decatur-Wayne- Including the cities of Norwalk, Lenox, Audubon, Earlham, Fontanelle, Bayard, Mount Ayr, Allerton, Lamoni, Exira, Seymour, Panora, New Market, Casey, Atlantic, Corning, Bedford, Creston, Adair, Osceola, Stuart, Winterset, Greenfield, Guthrie Center, Chariton, Humeston, Leon, Corydon, Indianola, and Carlisle 901 PM CDT Fri Jul 30 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 1 AM CDT SATURDAY THROUGH SATURDAY MORNING... The Flash Flood Watch continues for * Portions of south central Iowa, southwest Iowa and west central Iowa, including the following areas, in south central Iowa, Clarke, Decatur, Lucas, Madison, Ringgold, Union, Warren and Wayne. In southwest Iowa, Adair, Adams, Cass and Taylor. In west central Iowa, Audubon and Guthrie. * From 1 AM CDT Saturday through Saturday morning. * Heavy rainfall of 2 to 4 inches will be possible in the watch area. Local amounts to 5 inches will be possible. This could lead to localized flash flooding, especially in urban areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ KCM/Ansorge
153 WGUS63 KDMX 310827 FFADMX Flood Watch National Weather Service Des Moines IA 327 AM CDT Sat Jul 31 2021 IAZ057-058-073-084-310930- /O.CAN.KDMX.FF.A.0004.000000T0000Z-210731T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Audubon-Guthrie-Warren-Lucas- Including the cities of Audubon, Exira, Guthrie Center, Panora, Bayard, Casey, Indianola, Norwalk, Carlisle, and Chariton 327 AM CDT Sat Jul 31 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for Audubon, Guthrie, Warren, and Lucas counties has been cancelled. $$ IAZ070>072-081>083-092>095-311500- /O.CON.KDMX.FF.A.0004.000000T0000Z-210731T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Cass-Adair-Madison-Adams-Union-Clarke-Taylor-Ringgold-Decatur- Wayne- Including the cities of Atlantic, Greenfield, Stuart, Adair, Fontanelle, Winterset, Earlham, Corning, Creston, Osceola, Bedford, Lenox, New Market, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, and Humeston 327 AM CDT Sat Jul 31 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 AM CDT THIS MORNING... The Flash Flood Watch continues for * Portions of south central Iowa and southwest Iowa * Until 10 AM CDT this morning * Heavy rainfall of 2 to 4 inches will be possible in the watch area. Local amounts to 5 inches will be possible. This could lead to localized flash flooding, especially in urban areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
076 WGUS63 KDMX 311106 FFADMX Flood Watch National Weather Service Des Moines IA 606 AM CDT Sat Jul 31 2021 IAZ070>072-081>083-092>095-311215- /O.CAN.KDMX.FF.A.0004.000000T0000Z-210731T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Cass-Adair-Madison-Adams-Union-Clarke-Taylor-Ringgold-Decatur-Wayne- Including the cities of Bedford, Leon, Lenox, Greenfield, Seymour, Adair, Humeston, Allerton, New Market, Earlham, Fontanelle, Osceola, Lamoni, Atlantic, Corning, Stuart, Mount Ayr, Corydon, Winterset, and Creston 606 AM CDT Sat Jul 31 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of south central Iowa and southwest Iowa, including the following areas, in south central Iowa, Clarke, Decatur, Madison, Ringgold, Union and Wayne. In southwest Iowa, Adair, Adams, Cass and Taylor has been cancelled. The Flood Watch is cancelled. Flooding is no longer expected to pose a threat. $$ Cogil
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.