Alert archive / Iowa / Flood Watches in 2021
Flood Watch 2, NWS Des Moines, IA
NWS Des Moines, IA issued this flood watch at Aug 26, 2021, 3:03 PM CDT for 19 counties in Iowa. It took effect at Aug 26, 2021, 10:00 PM CDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Aug 26, 2021, 3:03 PM CDT (20:03 UTC)
- In effect from
- Aug 26, 2021, 10:00 PM CDT
- Expired
- Aug 27, 2021, 7:00 AM CDT
- In force
- 9 hr
- Issued by
- NWS Des Moines, IA
- Flood severity
- None
Counties Black Hawk County, IA, Bremer County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo County, IA, Emmet County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 121 km from the middle of the area, began a volume at 20:06 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
Minneapolis, MN (KMPX), launched 12:00Z, 8.1 hours before the alert went out and 226 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
- 1566 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
590 WGUS63 KDMX 262003 FFADMX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Des Moines IA 303 PM CDT Thu Aug 26 2021 .A boundary lifting into northern Iowa later this evening and overnight tonight combined with increasing thunderstorms capable of repeated locally heavy rainfall from late evening into the overnight hours may lead to some flash flooding. Though the area is very dry, urban locations and small creeks will be susceptible to flooding if heavy rainfall occurs. There is some uncertainty as to the exact location of the heaviest band of rainfall. IAZ005>007-015>017-023>028-034>039-270415- /O.NEW.KDMX.FA.A.0002.210827T0300Z-210827T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-Pocahontas- Humboldt-Wright-Franklin-Butler-Bremer-Calhoun-Webster-Hamilton- Hardin-Grundy-Black Hawk- Including the cities of Manson, Forest City, Parkersburg, Eagle Grove, Grundy Center, Clarksville, Clear Lake, Emmetsburg, Rolfe, Aplington, Shell Rock, Gilmore City, Waverly, Rockwell City, Lake City, Dike, Lake Mills, Northwood, Algona, Dumont, Reinbeck, Pocahontas, Pomeroy, Laurens, Waterloo, Clarion, Webster City, Greene, Allison, Cedar Falls, Fort Dodge, Ackley, Eldora, Conrad, Wellsburg, Humboldt, Iowa Falls, Hampton, Mason City, Fonda, Garner, Britt, Manly, Kanawha, and Belmond 303 PM CDT Thu Aug 26 2021 ...FLOOD WATCH IN EFFECT FROM 10 PM CDT THIS EVENING THROUGH 7 AM FRIDAY MORNING... The National Weather Service in Des Moines has issued a * Flood Watch for portions of central Iowa, north central Iowa, northeast Iowa, northwest Iowa and west central Iowa, including the following areas, in central Iowa, Grundy, Hamilton, Hardin and Webster. In north central Iowa, Butler, Cerro Gordo, Franklin, Hancock, Humboldt, Kossuth, Winnebago, Worth and Wright. In northeast Iowa, Black Hawk and Bremer. In northwest Iowa, Palo Alto and Pocahontas. In west central Iowa, Calhoun. * From 10 PM CDT this evening through Friday morning. * Though the area remains dry, locally heavy rainfall of 3 to 5 inches with locally higher amounts greater than 6 inches may lead to isolated flash flooding mainly in urban areas, low water crossings or small streams. * Rainfall rates of 1 to 2 inches per hour may lead to urban flooding and ponding or running water in city streets causing some travel issues. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ REV
4 follow-up statements
646 WGUS63 KDMX 270126 FFADMX Flood Watch National Weather Service Des Moines IA 826 PM CDT Thu Aug 26 2021 IAZ005>007-015>017-023>028-034>039-270930- /O.CON.KDMX.FA.A.0002.210827T0300Z-210827T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-Pocahontas- Humboldt-Wright-Franklin-Butler-Bremer-Calhoun-Webster-Hamilton- Hardin-Grundy-Black Hawk- Including the cities of Manson, Forest City, Parkersburg, Eagle Grove, Grundy Center, Clarksville, Clear Lake, Emmetsburg, Rolfe, Aplington, Shell Rock, Gilmore City, Waverly, Rockwell City, Lake City, Dike, Lake Mills, Northwood, Algona, Dumont, Reinbeck, Pocahontas, Pomeroy, Laurens, Waterloo, Clarion, Webster City, Greene, Allison, Cedar Falls, Fort Dodge, Ackley, Eldora, Conrad, Wellsburg, Humboldt, Iowa Falls, Hampton, Mason City, Fonda, Garner, Britt, Manly, Kanawha, and Belmond 826 PM CDT Thu Aug 26 2021 ...FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT FRIDAY... The Flood Watch continues for * Portions of central Iowa, north central Iowa, northeast Iowa, northwest Iowa and west central Iowa, including the following areas, in central Iowa, Grundy, Hamilton, Hardin and Webster. In north central Iowa, Butler, Cerro Gordo, Franklin, Hancock, Humboldt, Kossuth, Winnebago, Worth and Wright. In northeast Iowa, Black Hawk and Bremer. In northwest Iowa, Palo Alto and Pocahontas. In west central Iowa, Calhoun. * Until 7 AM CDT Friday. * Though the area remains dry, locally heavy rainfall of 3 to 5 inches with locally higher amounts greater than 6 inches may lead to isolated flash flooding mainly in urban areas, low water crossings or small streams. * Rainfall rates of 1 to 2 inches per hour may lead to urban flooding and ponding or running water in city streets causing some travel issues. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ AB/KP
029 WGUS63 KDMX 270433 FFADMX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Des Moines IA 1133 PM CDT Thu Aug 26 2021 IAZ004-271200- /O.EXA.KDMX.FA.A.0002.000000T0000Z-210827T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet- Including the cities of Estherville 1133 PM CDT Thu Aug 26 2021 ...FLOOD WATCH IN EFFECT UNTIL 7 AM CDT FRIDAY... The National Weather Service in Des Moines has expanded the * Flood Watch to include a portion of northwest Iowa, including the following area, Emmet. * Until 7 AM CDT Friday. * Though the area remains dry, locally heavy rainfall of 3 to 5 inches with locally higher amounts greater than 6 inches may lead to isolated flash flooding mainly in urban areas, low water crossings or small streams. * Rainfall rates of 1 to 2 inches per hour may lead to urban flooding and ponding or running water in city streets causing some travel issues. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ IAZ005>007-015>017-023>028-034>039-271200- /O.CON.KDMX.FA.A.0002.000000T0000Z-210827T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-Pocahontas- Humboldt-Wright-Franklin-Butler-Bremer-Calhoun-Webster-Hamilton- Hardin-Grundy-Black Hawk- Including the cities of Manson, Forest City, Parkersburg, Eagle Grove, Grundy Center, Clarksville, Clear Lake, Emmetsburg, Rolfe, Aplington, Shell Rock, Gilmore City, Waverly, Rockwell City, Lake City, Dike, Lake Mills, Northwood, Algona, Dumont, Reinbeck, Pocahontas, Pomeroy, Laurens, Waterloo, Clarion, Webster City, Greene, Allison, Cedar Falls, Fort Dodge, Ackley, Eldora, Conrad, Wellsburg, Humboldt, Iowa Falls, Hampton, Mason City, Fonda, Garner, Britt, Manly, Kanawha, and Belmond 1133 PM CDT Thu Aug 26 2021 ...FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT FRIDAY... The Flood Watch continues for * Portions of central Iowa, north central Iowa, northeast Iowa, northwest Iowa and west central Iowa, including the following areas, in central Iowa, Grundy, Hamilton, Hardin and Webster. In north central Iowa, Butler, Cerro Gordo, Franklin, Hancock, Humboldt, Kossuth, Winnebago, Worth and Wright. In northeast Iowa, Black Hawk and Bremer. In northwest Iowa, Palo Alto and Pocahontas. In west central Iowa, Calhoun. * Until 7 AM CDT Friday. * Though the area remains dry, locally heavy rainfall of 3 to 5 inches with locally higher amounts greater than 6 inches may lead to isolated flash flooding mainly in urban areas, low water crossings or small streams. * Rainfall rates of 1 to 2 inches per hour may lead to urban flooding and ponding or running water in city streets causing some travel issues. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ Podrazik
300 WGUS63 KDMX 270813 FFADMX Flood Watch National Weather Service Des Moines IA 313 AM CDT Fri Aug 27 2021 IAZ004>007-015>017-023>028-034>039-271200- /O.CON.KDMX.FA.A.0002.000000T0000Z-210827T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Calhoun-Webster- Hamilton-Hardin-Grundy-Black Hawk- Including the cities of Manson, Forest City, Parkersburg, Eagle Grove, Grundy Center, Clarksville, Clear Lake, Emmetsburg, Rolfe, Aplington, Shell Rock, Gilmore City, Waverly, Rockwell City, Lake City, Dike, Lake Mills, Northwood, Algona, Estherville, Dumont, Reinbeck, Pocahontas, Pomeroy, Laurens, Waterloo, Clarion, Webster City, Greene, Allison, Cedar Falls, Fort Dodge, Ackley, Eldora, Conrad, Wellsburg, Humboldt, Iowa Falls, Hampton, Mason City, Fonda, Garner, Britt, Manly, Kanawha, and Belmond 313 AM CDT Fri Aug 27 2021 ...FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT THIS MORNING... The Flood Watch continues for * Portions of central Iowa, north central Iowa, northeast Iowa, northwest Iowa and west central Iowa, including the following areas, in central Iowa, Grundy, Hamilton, Hardin and Webster. In north central Iowa, Butler, Cerro Gordo, Franklin, Hancock, Humboldt, Kossuth, Winnebago, Worth and Wright. In northeast Iowa, Black Hawk and Bremer. In northwest Iowa, Emmet, Palo Alto and Pocahontas. In west central Iowa, Calhoun. * Until 7 AM CDT this morning. * Storms with heavy rainfall will continue over portions over northern Iowa into the early morning hours, which will support a threat of flash flooding in the area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ Martin
633 WGUS63 KDMX 271154 FFADMX Flood Watch National Weather Service Des Moines IA 654 AM CDT Fri Aug 27 2021 IAZ004>007-015>017-023>028-034>039-271300- /O.EXP.KDMX.FA.A.0002.000000T0000Z-210827T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Calhoun-Webster- Hamilton-Hardin-Grundy-Black Hawk- Including the cities of Manson, Forest City, Parkersburg, Eagle Grove, Grundy Center, Clarksville, Clear Lake, Emmetsburg, Rolfe, Aplington, Shell Rock, Gilmore City, Waverly, Rockwell City, Lake City, Dike, Lake Mills, Northwood, Algona, Estherville, Dumont, Reinbeck, Pocahontas, Pomeroy, Laurens, Waterloo, Clarion, Webster City, Greene, Allison, Cedar Falls, Fort Dodge, Ackley, Eldora, Conrad, Wellsburg, Humboldt, Iowa Falls, Hampton, Mason City, Fonda, Garner, Britt, Manly, Kanawha, and Belmond 654 AM CDT Fri Aug 27 2021 ...FLOOD WATCH WILL EXPIRE AT 7 AM CDT THIS MORNING... The Flood Watch for portions of central Iowa, north central Iowa, northeast Iowa, northwest Iowa and west central Iowa, including the following areas, in central Iowa, Grundy, Hamilton, Hardin and Webster. In north central Iowa, Butler, Cerro Gordo, Franklin, Hancock, Humboldt, Kossuth, Winnebago, Worth and Wright. In northeast Iowa, Black Hawk and Bremer. In northwest Iowa, Emmet, Palo Alto and Pocahontas. In west central Iowa, Calhoun will expire at 7 AM CDT this morning. Scattered showers and storms will continue over northern Iowa during the morning hours, but the threat of excessive rainfall and flash flooding has diminished at this time. $$ Martin
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 3:30 AM CDT | Heat Advisory | DMX | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 16 more | 17 hr |
| Aug 26, 8:03 AM CDT | Special Weather Statement | DMX | Audubon, Calhoun, Carroll, Pocahontas, Sac | 42 min |
| Aug 26, 8:18 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll, Crawford, Greene, Sac | 42 min |
| Aug 26, 8:55 AM CDT | Special Weather Statement | DMX | Adair, Audubon, Dallas, Guthrie | 65 min |
| Aug 26, 9:18 AM CDT | Special Weather Statement | DMX | Boone, Hamilton, Webster | 57 min |
| Aug 26, 10:02 AM CDT | Special Weather Statement | DMX | Dallas, Jasper, Madison, Polk, Warren | 43 min |
| Aug 26, 12:29 PM CDT | Special Weather Statement | DMX | Boone, Story | 46 min |
| Aug 26, 1:46 PM CDT | Special Weather Statement | DMX | Davis, Wapello | 44 min |
| Aug 26, 2:16 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Wapello | 44 min |
Nearby
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.