Alert archive / Iowa / Flash Flood Watches in 2018
Flash Flood Watch 4, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood watch at Jun 20, 2018, 4:28 AM CDT for 24 counties in Iowa. It took effect at Jun 20, 2018, 1:00 PM CDT. It was in force for 15 hr.
The area
The counties it named.
The facts
- Issued
- Jun 20, 2018, 4:28 AM CDT (09:28 UTC)
- In effect from
- Jun 20, 2018, 1:00 PM CDT
- Expired
- Jun 21, 2018, 3:33 AM CDT
- In force
- 15 hr
- Issued by
- NWS Des Moines, IA
- Flood severity
- None
All 24 counties
Adair County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Madison County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Sac County, IA, Story County, IA, Webster County, IA, Winnebago County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 79 km from the middle of the area, began a volume at 09:29 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 00:00Z, 9.5 hours before the alert went out and 201 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
- 1806 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 818 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted.
390 WGUS63 KDMX 200928 FFADMX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Des Moines IA 428 AM CDT Wed Jun 20 2018 ...Widespread Heavy Rain This Afternoon into Thursday Morning... .Thunderstorms look to develop this afternoon and persist well into the night. Intense rainfall rates and rainfall totals are likely with these storms. IAZ004-005-015-023>025-033>036-044>048-057>060-070>072-201730- /O.NEW.KDMX.FF.A.0004.180620T1800Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet-Kossuth-Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun- Webster-Hamilton-Crawford-Carroll-Greene-Boone-Story-Audubon- Guthrie-Dallas-Polk-Cass-Adair-Madison- Including the cities of Estherville, Algona, Emmetsburg, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Eagle Grove, Clarion, Belmond, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, Webster City, Denison, Carroll, Jefferson, Boone, Ames, Audubon, Exira, Guthrie Center, Panora, Bayard, Casey, Perry, Waukee, Adel, Des Moines, Atlantic, Greenfield, Stuart, Adair, Fontanelle, Winterset, and Earlham 428 AM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH IN EFFECT FROM 1 PM CDT THIS AFTERNOON THROUGH THURSDAY MORNING... The National Weather Service in Des Moines has issued a * Flash Flood Watch for portions of central Iowa, north central Iowa, northwest Iowa, south central Iowa, southwest Iowa, and west central Iowa, including the following areas, in central Iowa, Boone, Dallas, Hamilton, Polk, Story, and Webster. In north central Iowa, Humboldt, Kossuth, and Wright. In northwest Iowa, Emmet, Palo Alto, and Pocahontas. In south central Iowa, Madison. In southwest Iowa, Adair and Cass. In west central Iowa, Audubon, Calhoun, Carroll, Crawford, Greene, Guthrie, and Sac. * From 1 PM CDT this afternoon through Thursday morning * A widespread swath of 1.5 to 3 inches of rainfall totals with higher amounts over 4 to 5 inches are anticipated this afternoon into early Thursday. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Intense rainfall rates are likely with these storms where 2 to 4 inches per hour rates will be common this afternoon and tonight. Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Podrazik
6 follow-up statements
314 WGUS63 KDMX 201657 FFADMX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Des Moines IA 1157 AM CDT Wed Jun 20 2018 ...Widespread Heavy Rain This Afternoon Through Tonight... .Thunderstorms will impact central Iowa, including the Des Moines metro, this afternoon into the early evening hours. Intense rainfall rates and rainfall totals are likely with these storms. The highest rainfall totals are expected across northern to northwestern Iowa, where showers and thunderstorms will continue through tonight. IAZ016-211200- /O.EXA.KDMX.FF.A.0004.180620T1800Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hancock- Including the cities of Garner, Britt, and Kanawha 1157 AM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH IN EFFECT THROUGH TONIGHT... The National Weather Service in Des Moines has expanded the * Flash Flood Watch to include a portion of north central Iowa, including the following area, Hancock. * Through Tonight * A widespread swath of 1.5 to 3 inches of rainfall with higher amounts over 4 to 5 inches are anticipated through tonight. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Intense rainfall rates are likely with these storms where 2 to 4 inches per hour rates will be common this afternoon and tonight. Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ IAZ046>048-057>060-070>072-210000- /O.EXT.KDMX.FF.A.0004.180620T1800Z-180621T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greene-Boone-Story-Audubon-Guthrie-Dallas-Polk-Cass-Adair-Madison- Including the cities of Jefferson, Boone, Ames, Audubon, Exira, Guthrie Center, Panora, Bayard, Casey, Perry, Waukee, Adel, Des Moines, Atlantic, Greenfield, Stuart, Adair, Fontanelle, Winterset, and Earlham 1157 AM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 7 PM CDT THIS EVENING... The Flash Flood Watch is now in effect for * Portions of central Iowa, south central Iowa, southwest Iowa, and west central Iowa, including the following areas, in central Iowa, Boone, Dallas, Polk, and Story. In south central Iowa, Madison. In southwest Iowa, Adair and Cass. In west central Iowa, Audubon, Greene, and Guthrie. * Until 7 PM CDT this evening * A widespread swath of 1.5 to 3 inches of rainfall is anticipated this afternoon into the early evening hours. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Intense rainfall rates are likely with these storms where 2 to 4 inches per hour rates will be common. Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ IAZ004-005-015-023>025-033>036-044-045-211200- /O.CON.KDMX.FF.A.0004.180620T1800Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet-Kossuth-Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun- Webster-Hamilton-Crawford-Carroll- Including the cities of Estherville, Algona, Emmetsburg, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Eagle Grove, Clarion, Belmond, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, Webster City, Denison, and Carroll 1157 AM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TONIGHT... The Flash Flood Watch continues for * Portions of central Iowa, north central Iowa, northwest Iowa, and west central Iowa, including the following areas, in central Iowa, Hamilton and Webster. In north central Iowa, Humboldt, Kossuth, and Wright. In northwest Iowa, Emmet, Palo Alto, and Pocahontas. In west central Iowa, Calhoun, Carroll, Crawford, and Sac. * Through Tonight * A widespread swath of 1.5 to 3 inches of rainfall totals with higher amounts over 4 to 5 inches are anticipated this afternoon through tonight. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Intense rainfall rates are likely with these storms where 2 to 4 inches per hour rates will be common this afternoon and tonight. Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Kotenberg
776 WGUS63 KDMX 202013 FFADMX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Des Moines IA 313 PM CDT Wed Jun 20 2018 ...Widespread Heavy Rainfall Through Tonight for Portions of Iowa... .Thunderstorms will continue to impact central Iowa, including the Des Moines metro, through the early evening hours. Intense rainfall rates of 1 to 2 inches per hour has been occurring with these storms. The highest rainfall totals are expected across northern to northwestern Iowa, where showers and thunderstorms will continue through tonight. IAZ057-058-070>072-202115- /O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Audubon-Guthrie-Cass-Adair-Madison- Including the cities of Audubon, Exira, Guthrie Center, Panora, Bayard, Casey, Atlantic, Greenfield, Stuart, Adair, Fontanelle, Winterset, and Earlham 313 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of south central Iowa, southwest Iowa, and west central Iowa has been cancelled. Though light rain may occur tonight, heavy rainfall has moved out of this area. $$ IAZ006-211200- /O.EXA.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Winnebago- Including the cities of Forest City and Lake Mills 313 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH IN EFFECT THROUGH TONIGHT... The National Weather Service in Des Moines has expanded the * Flash Flood Watch to include a portion of north central Iowa, including the following area, Winnebago. * Through Tonight * A widespread total swath of 1.5 to 3 inches of rainfall is forecast through tonight. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ IAZ025-035-036-045-210000- /O.EXT.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wright-Webster-Hamilton-Carroll- Including the cities of Eagle Grove, Clarion, Belmond, Fort Dodge, Webster City, and Carroll 313 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 7 PM CDT THIS EVENING... The Flash Flood Watch is now in effect for * Portions of central Iowa, north central Iowa, and west central Iowa, including the following areas, in central Iowa, Hamilton and Webster. In north central Iowa, Wright. In west central Iowa, Carroll. * Until 7 PM CDT this evening * A widespread total swath of 1.5 to 3 inches of rainfall is anticipated through this evening. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Intense rainfall rates are likely with these storms where 2 to 4 inches per hour rates will be common this afternoon and tonight. Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ IAZ046>048-059-060-210000- /O.CON.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greene-Boone-Story-Dallas-Polk- Including the cities of Jefferson, Boone, Ames, Perry, Waukee, Adel, and Des Moines 313 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... The Flash Flood Watch continues for * Portions of central Iowa and west central Iowa, including the following areas, in central Iowa, Boone, Dallas, Polk, and Story. In west central Iowa, Greene. * Until 7 PM CDT this evening * A widespread total swath of 1.5 to 3 inches of rainfall is anticipated through this evening. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Intense rainfall rates are likely with these storms where 2 to 4 inches per hour rates will be common. Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ IAZ004-005-015-016-023-024-033-034-044-211200- /O.CON.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet-Kossuth-Palo Alto-Hancock-Pocahontas-Humboldt-Sac-Calhoun- Crawford- Including the cities of Estherville, Algona, Emmetsburg, Garner, Britt, Kanawha, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, and Denison 313 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TONIGHT... The Flash Flood Watch continues for * Portions of north central Iowa, northwest Iowa, and west central Iowa, including the following areas, in north central Iowa, Hancock, Humboldt, and Kossuth. In northwest Iowa, Emmet, Palo Alto, and Pocahontas. In west central Iowa, Calhoun, Crawford, and Sac. * Through Tonight * A widespread total swath of 1.5 to 3 inches of rainfall with higher amounts over 4 to 5 inches are anticipated through tonight. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Intense rainfall rates are likely with these storms where 2 to 4 inches per hour rates will be common this afternoon and tonight. Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Kotenberg
321 WGUS63 KDMX 202150 FFADMX URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Des Moines IA 450 PM CDT Wed Jun 20 2018 ...Widespread Heavy Rainfall Through Tonight for Northern Iowa... .Thunderstorms will continue to impact northern and northwestern Iowa through tonight. A prolonged period of rain is likely tonight, with a widespread 1 to 3 inches of total rainfall accumulation expected. IAZ045>048-059-060-202300- /O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Carroll-Greene-Boone-Story-Dallas-Polk- Including the cities of Carroll, Jefferson, Boone, Ames, Perry, Waukee, Adel, and Des Moines 450 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of central Iowa and west central Iowa has been cancelled. Heavy rainfall has ended for this area. $$ IAZ044-202300- /O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Crawford- Including the city of Denison 450 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of west central Iowa has been cancelled. Heavy rainfall has ended for this area. $$ IAZ034-210000- /O.EXT.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Calhoun- Including the cities of Rockwell City, Manson, Lake City, and Pomeroy 450 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 7 PM CDT THIS EVENING... The Flash Flood Watch is now in effect for * A portion of west central Iowa, including the following area, Calhoun. * Until 7 PM CDT this evening * A widespread total swath of 1.5 to 3 inches of rainfall is anticipated through 7 pm. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ IAZ004>006-015-016-023-024-033-211200- /O.CON.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet-Kossuth-Winnebago-Palo Alto-Hancock-Pocahontas-Humboldt-Sac- Including the cities of Estherville, Algona, Forest City, Lake Mills, Emmetsburg, Garner, Britt, Kanawha, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Sac City, Lake View, Odebolt, Wall Lake, Schaller, and Early 450 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TONIGHT... The Flash Flood Watch continues for * Portions of north central Iowa, northwest Iowa, and west central Iowa, including the following areas, in north central Iowa, Hancock, Humboldt, Kossuth, and Winnebago. In northwest Iowa, Emmet, Palo Alto, and Pocahontas. In west central Iowa, Sac. * Through Tonight * A widespread total swath of 1.5 to 3 inches of rainfall with higher amounts over 4 inches is anticipated through tonight. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ IAZ025-035-036-210000- /O.CON.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wright-Webster-Hamilton- Including the cities of Eagle Grove, Clarion, Belmond, Fort Dodge, and Webster City 450 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... The Flash Flood Watch continues for * Portions of central Iowa and north central Iowa, including the following areas, in central Iowa, Hamilton and Webster. In north central Iowa, Wright. * Until 7 PM CDT this evening * A widespread total swath of 1.5 to 3 inches of rainfall is anticipated through this evening. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Kotenberg
428 WGUS63 KDMX 202351 FFADMX Flood Watch National Weather Service Des Moines IA 651 PM CDT Wed Jun 20 2018 ...Widespread Heavy Rainfall Through Tonight for Northern Iowa... .Thunderstorms will continue to impact northern and northwestern Iowa through tonight. A prolonged period of rain is likely tonight, with a widespread 1 to 3 inches of total rainfall accumulation expected. IAZ025-034>036-210100- /O.EXP.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Wright-Calhoun-Webster-Hamilton- Including the cities of Eagle Grove, Clarion, Belmond, Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, and Webster City 651 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH WILL EXPIRE AT 7 PM CDT THIS EVENING... The Flash Flood Watch for portions of central Iowa, north central Iowa, and west central Iowa will expire at 7 PM CDT this evening. Heavy precipitation has moved out of this area. $$ IAZ004>006-015-016-023-024-033-211200- /O.CON.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet-Kossuth-Winnebago-Palo Alto-Hancock-Pocahontas-Humboldt-Sac- Including the cities of Estherville, Algona, Forest City, Lake Mills, Emmetsburg, Garner, Britt, Kanawha, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Sac City, Lake View, Odebolt, Wall Lake, Schaller, and Early 651 PM CDT Wed Jun 20 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of north central Iowa, northwest Iowa, and west central Iowa, including the following areas, in north central Iowa, Hancock, Humboldt, Kossuth, and Winnebago. In northwest Iowa, Emmet, Palo Alto, and Pocahontas. In west central Iowa, Sac. * Through Thursday morning * A widespread total swath of 1.5 to 3 inches of rainfall with higher total amounts over 4 inches is anticipated through tonight. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Kotenberg
813 WGUS63 KDMX 210512 FFADMX Flood Watch National Weather Service Des Moines IA 1212 AM CDT Thu Jun 21 2018 ...Heavy Rainfall Overnight for Northern Iowa... .Thunderstorms will continue to impact northern and northwestern Iowa overnight. IAZ023-024-033-210615- /O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Pocahontas-Humboldt-Sac- Including the cities of Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Sac City, Lake View, Odebolt, Wall Lake, Schaller, and Early 1212 AM CDT Thu Jun 21 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of north central Iowa, northwest Iowa, and west central Iowa has been cancelled. The threat for heavy rain leading to flash flooding has ended. Therefore, the flash flood watch has been cancelled. $$ IAZ004>006-015-016-211200- /O.CON.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet-Kossuth-Winnebago-Palo Alto-Hancock- Including the cities of Estherville, Algona, Forest City, Lake Mills, Emmetsburg, Garner, Britt, and Kanawha 1212 AM CDT Thu Jun 21 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT THIS MORNING... The Flash Flood Watch continues for * Portions of north central Iowa and northwest Iowa, including the following areas, in north central Iowa, Hancock, Kossuth, and Winnebago. In northwest Iowa, Emmet and Palo Alto. * Until 7 AM CDT this morning * Additional rainfall of around 1 inch will be possible during the overnight hours. Localized heavier amounts up to two inches may occur. This heavy rain will fall on top of an already saturated ground from recent rains earlier this week. * Be prepared for water over roads due to rapid rises on creeks and streams or even water flowing from farm fields. If a road is closed or if water is running over it, please find an alternate route. Turn Around Don't Drown. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ AK/MJB
191 WGUS63 KDMX 210833 FFADMX Flood Watch National Weather Service Des Moines IA 333 AM CDT Thu Jun 21 2018 IAZ004>006-015-016-210945- /O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Emmet-Kossuth-Winnebago-Palo Alto-Hancock- Including the cities of Estherville, Algona, Forest City, Lake Mills, Emmetsburg, Garner, Britt, and Kanawha 333 AM CDT Thu Jun 21 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of north central Iowa and northwest Iowa has been cancelled. Heavy rainfall is longer a threat although there will be periods of light to moderate rainfall still today. With the absence of the heavy rain threat, the flash flood watch was cancelled. $$ FAB
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Des Moines, IA wrote its last area forecast discussion before this flash flood watch went out at Jun 20, 4:21 AM CDT, 7 minutes earlier.
Area forecast discussion, Jun 20, 4:21 AM CDT, 7 minutes before
Area Forecast Discussion National Weather Service Des Moines IA 421 AM CDT Wed Jun 20 2018 .SHORT TERM.../Today through Tonight/ Issued at 421 AM CDT Wed Jun 20 2018 Ongoing cluster of storms over northern Iowa are slowly weakening with respect rainfall rates. Dual pol and MRMS still suggest 1-2 inch per hour rates. Earlier in the night, dual pol instantaneous rates range from 3 to 5 inches per hour while MRMS was capped out around 2 inches. This was likely due to MRMS depicting some hail within this line of storms that transitioned northward through Highway 20 corridor. However, MRMS precipitation estimates a decent rain band that ranged from 2-3 inches over southeast Calhoun into southern Webster County. The 20.07z HRRR has the best handle on the radar trends this morning and slowly diminishes the current cluster by around 12z. However, some redevelop looks possible during the remainder of the morning hours over northern Iowa but low confidence with additional flash flooding as coverage seems minimal. The next concern of the forecast period was focused on widespread storms later today into tonight across central to northern Iowa. An area of low looks to develop in the vicinity of NW Missouri, SE Nebraska, NE Kansas, and SW Iowa by around 18z this afternoon. This coupled with a strong 500mb shortwave trough to dig across Nebraska and northern Iowa will ignite storms along a warm front extending from southeast Iowa northwest to the west-central portions of the CWA. The NAM/GFS and the 20.00z HREF look to have a good handle on the situations this afternoon and tonight. A widespread swath of 2 to 2.50" precipitable water values stretch from around Ottuwma northwest through Des Moines/Ames and into the northwest portions of the CWA. Warm layer cloud depths of 4000-4500 meters with moderate to strong moisture transport suggest more efficient rain producers in the aforementioned location. Increased QPF over the area as expecting a swatch of 1.5 to 3 inches from the central portions of the CWA northwest to between Carroll and Estherville. With the HREF depicting amounts over 4 to 5 inches, certainly these types of rainfall amounts will cause some flash flood concerns. Thus, confident in the heavy rain setup (and with the recent rains over the past few days) to issue a Flash Flood Watch this afternoon into Thursday morning. This coincides with Moderate Risk of excessive rainfall via WPC. Lower confidence with any widespread severe storms today into tonight as shear profiles remain weak. Instability tries to increase over southern Iowa this afternoon south of the boundary and certainly cannot rule out some brief elevated hail storms this afternoon into the evening. .LONG TERM.../Thursday through Tuesday/ Issued at 421 AM CDT Wed Jun 20 2018 Upper trough moving through the central Plains today will continue to deepen and close off over the state Thursday into Friday while continuing to wobble around the region. This will allow precipitation chances to continue across the state Thursday into Friday with bands of showers and some thunderstorms expected to rotate through the forecast area. Instability is weaker across the area with the upper trough overhead so went more with some shower wording with more of a slight chance for thunder Thursday into Friday. With the lack of instability the threat for heavy rainfall to wane some for Thursday into Friday. Otherwise the upper trough to push east into the Ohio Valley region by Friday night with another shortwave trough dropping through the state by late Saturday night into Sunday. This could bring another chance for some scattered showers and thunderstorms. A stronger upper level trough to then deepen as it moves east through the region Monday into Wednesday of next week. This system will again bring additional chances for precipitation to the state. Therefore expecting a fairly wet period through the next 7 days. Will have to assess the potential for additional heavy rain threats with the system early next week as any flooding issues from the next 24 hours could be further exacerbated by continued precipitation chances this weekend and again next week. As for temperatures, highs to remain cooler Thursday into Friday with the clouds/precipitation in place and the upper trough rotating over the state with highs mainly in the low to mid 70s, with even a few upper 60s possible Thursday. Temperatures to then warm back to around 80 for Saturday through Monday and then warm back into the 80s toward the middle of next week. && .AVIATION.../For the 06Z TAFS through 06Z Wednesday night/ Issued at 1201 AM CDT Wed Jun 20 2018 While VFR conditions are lingering over south central Iowa terminals, widespread MVFR and IFR ceilings are expected to spread from northern Iowa southward. Scattered showers and thunderstorms are expected, but low confidence continues in exact location and timing in the weak flow so any mention of showers/storms is vicinity through 18z. Thereafter, there is no precipitation mentioned, but it is likely this will need to be added once exact placement of rain is determined. && .DMX WATCHES/WARNINGS/ADVISORIES... Flash Flood Watch from 1 PM CDT this afternoon through Thursday morning for IAZ004-005-015-023>025-033>036-044>048-057>060- 070>072. && SHORT TERM...Podrazik LONG TERM...Beerends AVIATION...Ansorge
Hazardous weather outlook, Jun 20, 4:23 AM CDT, 5 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 423 AM CDT Wed Jun 20 2018 IAZ004-005-015-023>025-033>036-044>048-057-058-070>072-211030- Emmet-Kossuth-Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun- Webster-Hamilton-Crawford-Carroll-Greene-Boone-Story-Audubon- Guthrie-Cass-Adair-Madison- 423 AM CDT Wed Jun 20 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...Today and Tonight A Flash Flood Watch is in effect for the area. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Thunderstorms are likely today into tonight. Heavy rainfall is expected. An isolated strong to severe storm will be possible mainly south of Highway 20 this afternoon and evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There is a chance for weak thunderstorms across the area Thursday into Friday. The severe weather threat is minimal. Thunderstorm chances continue off and on through the weekend into early next week. The threat of severe weather will be determined in the coming days. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed later today and tonight. Reports of any flooding or heavy rainfall are always appreciated. IAZ006-007-016-017-026>028-037>039-049-050-061-062-073>075- 081>086-092>097-211030- Winnebago-Worth-Hancock-Cerro Gordo-Franklin-Butler-Bremer-Hardin- Grundy-Black Hawk-Marshall-Tama-Jasper-Poweshiek-Warren-Marion- Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold- Decatur-Wayne-Appanoose-Davis- 423 AM CDT Wed Jun 20 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...Today and Tonight Thunderstorms are likely today into tonight. Heavy rainfall will be possible with the thunderstorms. An isolated strong to severe storm will be possible mainly south of Highway 20 this afternoon and evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There is a chance for weak thunderstorms across the area Thursday into Friday. The severe weather threat is minimal. Thunderstorm chances continue off and on through the weekend into early next week. The threat of severe weather will be determined in the coming days. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed later today and tonight. Reports of heavy rainfall are always appreciated. IAZ059-060-211030- Dallas-Polk- 423 AM CDT Wed Jun 20 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...Today and tonight A Flash Flood Watch and a few River Flood Warnings are in effect for the area. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Thunderstorms are likely today into tonight. Heavy rainfall is expected. An isolated strong to severe storm will be possible this afternoon and evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There is a chance for weak thunderstorms across the area Thursday into Friday. The severe weather threat is minimal. Thunderstorm chances continue off and on through the weekend into early next week. The threat of severe weather will be determined in the coming days. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed later today and tonight. Reports of any flooding or heavy rainfall are always appreciated. MJB
In the hours before
Special weather statement, Jun 20, 1:19 AM CDT, 3 hours 9 minutes before
Special Weather Statement
National Weather Service Des Moines IA
119 AM CDT WED JUN 20 2018
IAZ044-045-200715-
Carroll IA-Crawford IA-
119 AM CDT WED JUN 20 2018
...Heavy Rain to Impact Carroll County Overnight...
At 118 AM CDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Manning, or 7 miles southwest of Carroll, moving
north at 15 mph.
Rainfall amounts up to two inches will be possible with this storm.
Street flooding and small creeks may quickly rise as a result of the
heavy rain.
Locations impacted include...
Carroll, Manning, Glidden, Arcadia, Breda, Templeton, Westside,
Dedham, Halbur, Lidderdale, Lanesboro, Willey, Ralston, Aspinwall,
Hobbs County Park, Arthur N Neu Airport, Manning Municipal Airport
and Swan Lake State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4221 9511 4221 9463 4202 9463 4186 9487
4186 9500 4188 9516
TIME...MOT...LOC 0618Z 192DEG 12KT 4201 9499
PodrazikSpecial weather statement, Jun 20, 2:17 AM CDT, 2 hours 11 minutes before
Special Weather Statement
National Weather Service Des Moines IA
217 AM CDT WED JUN 20 2018
IAZ035-036-047-200815-
Hamilton IA-Boone IA-Webster IA-
217 AM CDT WED JUN 20 2018
...Strong Winds to Impact Portions of Northern Iowa...
At 217 AM CDT, Doppler radar was tracking a strong thunderstorm 11
miles east of Gowrie, or 15 miles south of Fort Dodge, moving
southeast at 20 mph.
Wind gusts of 50 to 55 mph will be possible with this storm.
Locations impacted include...
Boone, Dayton, Stratford, Stanhope, Lehigh, Harcourt, Pilot Mound,
Fraser, Boone Municipal Airport, Brushy Creek St Recreation Area,
Dolliver Memorial State Park and Woodman Hollow State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4225 9365 4221 9369 4221 9370 4220 9370
4203 9385 4228 9423 4243 9409
TIME...MOT...LOC 0717Z 304DEG 16KT 4231 9407
PodrazikLocal storm report, Jun 20, 3:36 AM CDT, 52 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
336 AM CDT WED JUN 20 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0329 AM FLASH FLOOD 3 N FARNHAMVILLE 42.32N 94.42W
06/20/2018 CALHOUN IA LAW ENFORCEMENT
A ONE MILE STRETCH OF P21 (ZEARING AVE)
CLOSED DUE TO WATER OVER THE ROAD. DEPTH
UNKNOWN AT THIS TIME, BUT CALHOUN COUNTY
SHERIFF'S DEPUTY FELT STRONGLY ENOUGH THAT
IT NEEDED BARRICADES. LOCATION BETWEEN 320TH
AND 330TH AND LIKELY DUE TO HARDIN CREEK.
&&
KLPThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 8:39 PM CDT | River Flood Warning | DMX | Polk | 9 days |
| Jun 19, 8:39 PM CDT | River Flood Warning | DMX | Polk | 8 days |
| Jun 20, 1:19 AM CDT | Special Weather Statement | DMX | Carroll | 56 min |
| Jun 20, 2:12 AM CDT | Flash Flood Warning | DMX | Calhoun, Webster | 5 hr |
| Jun 20, 2:17 AM CDT | Special Weather Statement | DMX | Boone | 58 min |
| Jun 20, 10:38 AM CDT | River Flood Warning | DMX | Webster | 19 days |
| Jun 20, 10:38 AM CDT | River Flood Warning | DMX | Boone, Hamilton, Webster | 3 days |
| Jun 20, 10:43 AM CDT | River Flood Watch | DMX | Dallas, Polk | 6 days |
| Jun 20, 10:43 AM CDT | River Flood Watch | DMX | Polk | 6 days |
| Jun 20, 10:43 AM CDT | River Flood Watch | DMX | Black Hawk | 34 hr |
| Jun 20, 10:43 AM CDT | River Flood Watch | DMX | Polk, Story | 7 hr |
| Jun 20, 10:43 AM CDT | River Flood Watch | DMX | Jasper, Marion, Polk | 10 hr |
| Jun 20, 10:43 AM CDT | River Flood Watch | DMX | Emmet | 6 hr |
| Jun 20, 10:43 AM CDT | River Flood Watch | DMX | Humboldt | 10 hr |
| Jun 20, 12:49 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Marion | 41 min |
| Jun 20, 2:16 PM CDT | Tornado Warning | DMX | Carroll, Greene | 29 min |
| Jun 20, 2:22 PM CDT | Tornado Warning | DMX | Boone, Dallas, Greene | 25 min |
| Jun 20, 2:26 PM CDT | Special Weather Statement | DMX | Davis, Wapello | 49 min |
| Jun 20, 2:43 PM CDT | Special Weather Statement | DMX | Polk, Story | 62 min |
| Jun 20, 2:43 PM CDT | Tornado Warning | DMX | Webster | 47 min |
| Jun 20, 2:46 PM CDT | Tornado Warning | DMX | Calhoun, Greene | 17 min |
| Jun 20, 3:02 PM CDT | Tornado Warning | DMX | Hardin | 11 min |
| Jun 20, 3:16 PM CDT | Tornado Warning | DMX | Hardin | 29 min |
| Jun 20, 3:18 PM CDT | Tornado Warning | DMX | Grundy, Hardin | 57 min |
| Jun 20, 3:21 PM CDT | Tornado Warning | DMX | Humboldt, Kossuth | 39 min |
| Jun 20, 3:24 PM CDT | Tornado Warning | DMX | Webster | 37 min |
| Jun 20, 3:57 PM CDT | Tornado Warning | DMX | Grundy, Hardin | 33 min |
| Jun 20, 4:06 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Humboldt, Kossuth, Wright | 39 min |
| Jun 20, 4:13 PM CDT | Flash Flood Warning | DMX | Humboldt, Kossuth, Palo Alto, Pocahontas | 6 hr |
| Jun 20, 4:25 PM CDT | Flash Flood Warning | DMX | Humboldt, Kossuth | 6 hr |
| Jun 20, 5:06 PM CDT | River Flood Warning | DMX | Emmet | 38 days |
| Jun 20, 5:20 PM CDT | River Flood Warning | DMX | Polk, Story | 3 hr |
| Jun 20, 5:34 PM CDT | Tornado Warning | DMX | Mahaska, Monroe, Wapello | 41 min |
| Jun 20, 6:05 PM CDT | Severe Thunderstorm Warning | DMX | Davis, Wapello | 41 min |
| Jun 20, 6:45 PM CDT | Severe Thunderstorm Warning | DMX | Story | 30 min |
Nearby
Flash Flood Watches in Iowa, 2018Every flash flood watch in 2018
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.