Alert archive / Colorado / Flash Flood Watches in 2021
Flash Flood Watch 7, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood watch at Jul 29, 2021, 2:03 PM MDT for 16 counties in Colorado. It took effect at Jul 30, 2021, 11:00 AM MDT. It was in force for 34 hr.
The area
The counties it named.
The facts
- Issued
- Jul 29, 2021, 2:03 PM MDT (20:03 UTC)
- In effect from
- Jul 30, 2021, 11:00 AM MDT
- Expired
- Jul 31, 2021, 9:00 PM MDT
- In force
- 34 hr
- Issued by
- NWS Denver/Boulder, CO
- Flood severity
- None
Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Clear Creek County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 59 km from the middle of the area, began a volume at 20:03 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
Denver, CO (KDNR), launched 12:00Z, 8.1 hours before the alert went out and 170 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
- 2 J/kg
- Mixed-layer CIN
- -369 J/kg
- Mixed-layer LCL
- 2462 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
890 WGUS65 KBOU 292003 FFABOU URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Denver CO 203 PM MDT Thu Jul 29 2021 COZ032>035-300415- /O.NEW.KBOU.FF.A.0007.210730T1700Z-210731T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Grand and Summit Counties Below 9000 Feet-South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of Winter Park, Rocky Mountain National Park, Laramie and Medicine Bow Mountains, Red Feather Lakes, Breckenridge, Williams Fork Mountains, Glendevey, Indian Peaks, Nederland, Eisenhower Tunnel, Kremmling, East Slopes Southern Gore Range, Mount Evans, Grand Lake, Cameron Pass, East Slopes Mosquito Range, Berthoud Pass, Granby, Kenosha Mountains, Estes Park, Willow Creek Pass, Hot Sulphur Springs, Dillon, Fraser, and Rabbit Ears Range 203 PM MDT Thu Jul 29 2021 ...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING... The National Weather Service in Denver has issued a * Flash Flood Watch for Portions of central and north central Colorado, including the following areas, in central Colorado, Grand and Summit Counties Below 9000 Feet and South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet. In north central Colorado, Larimer and Boulder Counties Between 6000 and 9000 Feet and South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet. * From Friday morning through Friday evening. * Thunderstorms will become more numerous across the mountains and foothills by Friday afternoon, and will have potential to produce flash flooding in the burn areas. The highest threat areas would be the Cameron Peak, East Troublesome, and Williams Fork burn areas, with a little lower threat for the Calwood burn area. Rainfall amounts up to 1 inch will be possible in less than an hour. * Burn scars will be susceptible to heavy rainfall, leading to quick runoff and possible debris and mud flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Barjenbruch
7 follow-up statements
235 WGUS65 KBOU 300249 FFABOU Flood Watch National Weather Service Denver CO 849 PM MDT Thu Jul 29 2021 COZ032>035-310600- /O.CON.KBOU.FF.A.0007.210730T1700Z-210731T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Grand and Summit Counties Below 9000 Feet-South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of Winter Park, Rocky Mountain National Park, Laramie and Medicine Bow Mountains, Red Feather Lakes, Breckenridge, Williams Fork Mountains, Glendevey, Indian Peaks, Nederland, Eisenhower Tunnel, Kremmling, East Slopes Southern Gore Range, Mount Evans, Grand Lake, Cameron Pass, East Slopes Mosquito Range, Berthoud Pass, Granby, Kenosha Mountains, Estes Park, Willow Creek Pass, Hot Sulphur Springs, Dillon, Fraser, and Rabbit Ears Range 849 PM MDT Thu Jul 29 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 11 AM FRIDAY MORNING UNTIL MIDNIGHT FRIDAY NIGHT... The Flash Flood Watch continues for * Portions of central and north central Colorado, including the following areas, in central Colorado, Grand and Summit Counties Below 9000 Feet and South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet. In north central Colorado, Larimer and Boulder Counties Between 6000 and 9000 Feet and South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet. * From Friday morning through Friday evening. * Thunderstorms will become more numerous across the mountains and foothills by Friday afternoon, and will have potential to produce flash flooding in the burn areas. The highest threat areas would be the Cameron Peak, East Troublesome, and Williams Fork burn areas, with a little lower threat for the Calwood burn area. Rainfall amounts up to 1 inch will be possible in less than an hour. * Burn scars will be susceptible to heavy rainfall, leading to quick runoff and possible debris and mud flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Bowen
965 WGUS65 KBOU 301049 FFABOU URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Denver CO 449 AM MDT Fri Jul 30 2021 COZ030-031-302300- /O.EXA.KBOU.FF.A.0007.210730T1700Z-210731T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jackson County Below 9000 Feet-West Jackson and West Grand Counties Above 9000 Feet- Including the cities of Rand, North Park, Mt Zirkel, Walden, Gould, and Spicer 449 AM MDT Fri Jul 30 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 11 AM MDT THIS MORNING THROUGH THIS EVENING... The National Weather Service in Denver has expanded the * Flash Flood Watch to include A portion of north central Colorado, including the following areas, Jackson County Below 9000 Feet and West Jackson and West Grand Counties Above 9000 Feet. * From 11 AM MDT this morning through this evening. * Thunderstorms will become more numerous by this afternoon, and will have potential to produce flash flooding in the burn areas. Rainfall amounts up to 1 inch will be possible in less than an hour. * Burn scars will be particularly susceptible to heavy rainfall, leading to quick runoff and possible debris and mud flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ COZ032>035-302300- /O.CON.KBOU.FF.A.0007.210730T1700Z-210731T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Grand and Summit Counties Below 9000 Feet-South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of Winter Park, Rocky Mountain National Park, Laramie and Medicine Bow Mountains, Red Feather Lakes, Breckenridge, Williams Fork Mountains, Glendevey, Indian Peaks, Nederland, Eisenhower Tunnel, Kremmling, East Slopes Southern Gore Range, Mount Evans, Grand Lake, Cameron Pass, East Slopes Mosquito Range, Berthoud Pass, Granby, Kenosha Mountains, Estes Park, Willow Creek Pass, Hot Sulphur Springs, Dillon, Fraser, and Rabbit Ears Range 449 AM MDT Fri Jul 30 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 11 AM MDT THIS MORNING THROUGH THIS EVENING... The Flash Flood Watch continues for * Portions of central and north central Colorado, including the following areas, in central Colorado, Grand and Summit Counties Below 9000 Feet and South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet. In north central Colorado, Larimer and Boulder Counties Between 6000 and 9000 Feet and South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet. * From 11 AM MDT this morning through this evening. * Thunderstorms will become more numerous across the mountains and foothills by this afternoon, and will have potential to produce flash flooding in the burn areas. The highest threat areas would be the Cameron Peak, East Troublesome, and Williams Fork burn areas, with a little lower threat for the Calwood burn area. Rainfall amounts up to 1 inch will be possible in less than an hour. * Burn scars will be particularly susceptible to heavy rainfall, leading to quick runoff and possible debris and mud flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Direnzo
359 WGUS65 KBOU 301545 FFABOU URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Denver CO 945 AM MDT Fri Jul 30 2021 COZ036>041-043-302345- /O.EXB.KBOU.FF.A.0007.210731T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet-Central and Southeast Park County-Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- Including the cities of Hartsel, Elbert, Westcreek, Roggen, Arvada, Central City, Larkspur, Bailey, Evergreen, Georgetown, Lakewood, Aurora, Fairplay, Littleton, Brighton, Boulder, Highlands Ranch, Fort Lupton, Loveland, Kiowa, Eaton, Longmont, Fondis, Denver International Airport, Golden, Parker, Castle Rock, City of Denver, Fort Collins, Greeley, Nunn, Idaho Springs, Lake George, Hereford, and South Park 945 AM MDT Fri Jul 30 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 6 PM MDT THIS EVENING UNTIL 9 PM SATURDAY EVENING... The National Weather Service in Denver has expanded the * Flash Flood Watch to include Portions of central, north central, and northeast Colorado, including the following areas, in central Colorado, Central and Southeast Park County and Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet. In north central Colorado, Larimer County Below 6000 Feet/Northwest Weld County. In northeast Colorado, Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County, Central and South Weld County, Elbert/Central and East Douglas Counties Above 6000 Feet and North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County. * From 6 PM MDT this evening through Saturday evening. * Scattered thunderstorms will develop late this afternoon or evening, and may then continue overnight with locally heavy rainfall and potential for flash flooding. Rainfall amounts of 1 to 2 inches in less than an hour will be possible from the stronger storms. There is a threat that a few storms with heavy rain will continue overnight into early Saturday morning. Additional rounds of showers and storms can be expected Saturday afternoon and evening. * Flash flooding will be possible in urban and low lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Never drive through a flooded area. && $$ COZ030>035-302345- /O.EXT.KBOU.FF.A.0007.210730T1700Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jackson County Below 9000 Feet-West Jackson and West Grand Counties Above 9000 Feet-Grand and Summit Counties Below 9000 Feet-South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of North Park, Rocky Mountain National Park, Mt Zirkel, Laramie and Medicine Bow Mountains, Red Feather Lakes, Breckenridge, Williams Fork Mountains, Glendevey, Indian Peaks, Nederland, Eisenhower Tunnel, Kremmling, East Slopes Southern Gore Range, Mount Evans, Grand Lake, Cameron Pass, East Slopes Mosquito Range, Berthoud Pass, Winter Park, Granby, Hot Sulphur Springs, Kenosha Mountains, Gould, Willow Creek Pass, Spicer, Rand, Estes Park, Dillon, Fraser, Walden, and Rabbit Ears Range 945 AM MDT Fri Jul 30 2021 ...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 9 PM SATURDAY EVENING... The Flash Flood Watch is now in effect for * Portions of central and north central Colorado, including the following areas, in central Colorado, Grand and Summit Counties Below 9000 Feet and South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet. In north central Colorado, Jackson County Below 9000 Feet, Larimer and Boulder Counties Between 6000 and 9000 Feet, South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet and West Jackson and West Grand Counties Above 9000 Feet. * Through Saturday evening. * Thunderstorms will become more numerous across the mountains and foothills by this afternoon, and will have potential to produce flash flooding. The highest threat areas would be the Cameron Peak, East Troublesome, Williams Fork, and Calwood burn areas, but flash flooding will even be possible in non-burn scar areas due to the intensity of the rainfall. Rainfall amounts around 1.5 inches will be possible in less than an hour. While storms should gradually diminish overnight, there is still a threat of heavy rain continuing in the foothill areas overnight into early Saturday morning. Additional rounds of showers and storms can be expected Saturday afternoon and evening. * Burn scars will be particularly susceptible to heavy rainfall, leading to quick runoff and debris and mud flows. The flood threat may last through the night. PRECAUTIONARY/PREPAREDNESS ACTIONS... Have multiple ways to receive warnings, including television, weather radio, phone, family, and friends. Avoid burn areas in particular, and be ready to move to higher ground. && $$ Barjenbruch
599 WGUS65 KBOU 310116 FFABOU Flood Watch National Weather Service Denver CO 716 PM MDT Fri Jul 30 2021 COZ030>035-311215- /O.CON.KBOU.FF.A.0007.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jackson County Below 9000 Feet-West Jackson and West Grand Counties Above 9000 Feet-Grand and Summit Counties Below 9000 Feet-South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of North Park, Rocky Mountain National Park, Mt Zirkel, Laramie and Medicine Bow Mountains, Red Feather Lakes, Breckenridge, Williams Fork Mountains, Glendevey, Indian Peaks, Nederland, Eisenhower Tunnel, Kremmling, East Slopes Southern Gore Range, Mount Evans, Grand Lake, Cameron Pass, East Slopes Mosquito Range, Berthoud Pass, Winter Park, Granby, Hot Sulphur Springs, Kenosha Mountains, Gould, Willow Creek Pass, Spicer, Rand, Estes Park, Dillon, Fraser, Walden, and Rabbit Ears Range 716 PM MDT Fri Jul 30 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY EVENING... The Flash Flood Watch continues for * Portions of central and north central Colorado, including the following areas, in central Colorado, Grand and Summit Counties Below 9000 Feet and South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet. In north central Colorado, Jackson County Below 9000 Feet, Larimer and Boulder Counties Between 6000 and 9000 Feet, South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet and West Jackson and West Grand Counties Above 9000 Feet. * Through Saturday evening. * Showers and thunderstorms will continue off and on through Saturday, and have potential to produce additional flash flooding. The highest flash flood threat areas would be the Cameron Peak, East Troublesome, Williams Fork, and Calwood burn areas, but flash flooding will even be possible in non-burn scar areas due to the intensity of the rainfall. Rainfall amounts around 1.5 inches will be possible in less than an hour, with storm total accumulations even higher. While storms should gradually diminish overnight, there is still a threat of heavy rain continuing in the foothill areas overnight into early Saturday morning. Additional rounds of showers and storms can be expected Saturday afternoon and evening. * Burn scars will be particularly susceptible to heavy rainfall, leading to quick runoff and debris and mud flows. The flood threat may last through the night. PRECAUTIONARY/PREPAREDNESS ACTIONS... Have multiple ways to receive warnings, including television, weather radio, phone, family, and friends. Avoid burn areas in particular, and be ready to move to higher ground. && $$ COZ036>041-043-311215- /O.CON.KBOU.FF.A.0007.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet-Central and Southeast Park County-Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- Including the cities of Hartsel, Elbert, Westcreek, Roggen, Arvada, Central City, Larkspur, Bailey, Evergreen, Georgetown, Lakewood, Aurora, Fairplay, Littleton, Brighton, Boulder, Highlands Ranch, Fort Lupton, Loveland, Kiowa, Eaton, Longmont, Fondis, Denver International Airport, Golden, Parker, Castle Rock, City of Denver, Fort Collins, Greeley, Nunn, Idaho Springs, Lake George, Hereford, and South Park 716 PM MDT Fri Jul 30 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 6 PM MDT THIS EVENING UNTIL 9 PM SATURDAY EVENING... The Flash Flood Watch continues for * Portions of central, north central, and northeast Colorado, including the following areas, in central Colorado, Central and Southeast Park County and Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet. In north central Colorado, Larimer County Below 6000 Feet/Northwest Weld County. In northeast Colorado, Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County, Central and South Weld County, Elbert/Central and East Douglas Counties Above 6000 Feet and North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County. * Through Saturday evening. * Showers and thunderstorms may continue overnight, with locally heavy rainfall and potential for flash flooding. Rainfall amounts of 1 to 2 inches in less than an hour will be possible from the stronger storms. Additional rounds of showers and storms can be expected through Saturday evening. * Flash flooding will be possible in urban and low lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Never drive through a flooded area. && $$ Barjenbruch
312 WGUS65 KBOU 311112 FFABOU Flood Watch National Weather Service Denver CO 512 AM MDT Sat Jul 31 2021 COZ030>035-312100- /O.CON.KBOU.FF.A.0007.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jackson County Below 9000 Feet-West Jackson and West Grand Counties Above 9000 Feet-Grand and Summit Counties Below 9000 Feet-South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of North Park, Rocky Mountain National Park, Mt Zirkel, Laramie and Medicine Bow Mountains, Red Feather Lakes, Breckenridge, Williams Fork Mountains, Glendevey, Indian Peaks, Nederland, Eisenhower Tunnel, Kremmling, East Slopes Southern Gore Range, Mount Evans, Grand Lake, Cameron Pass, East Slopes Mosquito Range, Berthoud Pass, Winter Park, Granby, Hot Sulphur Springs, Kenosha Mountains, Gould, Willow Creek Pass, Spicer, Rand, Estes Park, Dillon, Fraser, Walden, and Rabbit Ears Range 512 AM MDT Sat Jul 31 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * Portions of central and north central Colorado, including the following areas, in central Colorado, Grand and Summit Counties Below 9000 Feet and South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet. In north central Colorado, Jackson County Below 9000 Feet, Larimer and Boulder Counties Between 6000 and 9000 Feet, South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet and West Jackson and West Grand Counties Above 9000 Feet. * Through this evening. * Additional rounds of showers and storms can be expected later this morning and will continue into this evening, The stronger storms will produce 1-2 inches of rainfall in less than one hour. * Burn scars will be especially susceptible to heavy rainfall, leading to quick runoff and debris and mud flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ COZ036>041-043-312100- /O.CON.KBOU.FF.A.0007.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet-Central and Southeast Park County-Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- Including the cities of Hartsel, Elbert, Westcreek, Roggen, Arvada, Central City, Larkspur, Bailey, Evergreen, Georgetown, Lakewood, Aurora, Fairplay, Littleton, Brighton, Boulder, Highlands Ranch, Fort Lupton, Loveland, Kiowa, Eaton, Longmont, Fondis, Denver International Airport, Golden, Parker, Castle Rock, City of Denver, Fort Collins, Greeley, Nunn, Idaho Springs, Lake George, Hereford, and South Park 512 AM MDT Sat Jul 31 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * Portions of central, north central, and northeast Colorado, including the following areas, in central Colorado, Central and Southeast Park County and Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet. In north central Colorado, Larimer County Below 6000 Feet/Northwest Weld County. In northeast Colorado, Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County, Central and South Weld County, Elbert/Central and East Douglas Counties Above 6000 Feet and North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County. * Through this evening. * Additional rounds of showers and storms can be expected later this morning and will continue into this evening. The stronger storms will produce 1-2 inches of rainfall in less than one hour. * Flash flooding will be possible in urban and low lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Cooper
279 WGUS65 KBOU 311830 FFABOU Flood Watch National Weather Service Denver CO 1230 PM MDT Sat Jul 31 2021 COZ030>035-010230- /O.CON.KBOU.FF.A.0007.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jackson County Below 9000 Feet-West Jackson and West Grand Counties Above 9000 Feet-Grand and Summit Counties Below 9000 Feet-South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of North Park, Rocky Mountain National Park, Mt Zirkel, Laramie and Medicine Bow Mountains, Red Feather Lakes, Breckenridge, Williams Fork Mountains, Glendevey, Indian Peaks, Nederland, Eisenhower Tunnel, Kremmling, East Slopes Southern Gore Range, Mount Evans, Grand Lake, Cameron Pass, East Slopes Mosquito Range, Berthoud Pass, Winter Park, Granby, Hot Sulphur Springs, Kenosha Mountains, Gould, Willow Creek Pass, Spicer, Rand, Estes Park, Dillon, Fraser, Walden, and Rabbit Ears Range 1230 PM MDT Sat Jul 31 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING... The Flash Flood Watch continues for * Portions of central and north central Colorado, including the following areas, in central Colorado, Grand and Summit Counties Below 9000 Feet and South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet. In north central Colorado, Jackson County Below 9000 Feet, Larimer and Boulder Counties Between 6000 and 9000 Feet, South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet and West Jackson and West Grand Counties Above 9000 Feet. * Until 9 PM MDT this evening. * Additional rounds of showers and storms can be expected through this evening. The stronger storms will produce 1-2 inches of rainfall in less than one hour. * Burn scars will be especially susceptible to heavy rainfall, leading to quick runoff and debris and mud flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... Have multiple ways to receive warnings, including television, weather radio, phone, family, and friends. Avoid burn areas in particular, and be ready to move to higher ground. && $$ COZ036>041-043-010230- /O.CON.KBOU.FF.A.0007.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet-Central and Southeast Park County-Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- Including the cities of Hartsel, Elbert, Westcreek, Roggen, Arvada, Central City, Larkspur, Bailey, Evergreen, Georgetown, Lakewood, Aurora, Fairplay, Littleton, Brighton, Boulder, Highlands Ranch, Fort Lupton, Loveland, Kiowa, Eaton, Longmont, Fondis, Denver International Airport, Golden, Parker, Castle Rock, City of Denver, Fort Collins, Greeley, Nunn, Idaho Springs, Lake George, Hereford, and South Park 1230 PM MDT Sat Jul 31 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING... The Flash Flood Watch continues for * Portions of central, north central, and northeast Colorado, including the following areas, in central Colorado, Central and Southeast Park County and Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet. In north central Colorado, Larimer County Below 6000 Feet/Northwest Weld County. In northeast Colorado, Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County, Central and South Weld County, Elbert/Central and East Douglas Counties Above 6000 Feet and North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County. * Until 9 PM MDT this evening. * Additional rounds of showers and storms can be expected this afternoon and evening. The stronger storms will produce 1-2 inches of rainfall in less than one hour. The main threat of flooding will be along and west of I-25, and across the Palmer Divide area. * Flash flooding will be possible in urban and low lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Never drive through a flooded area. && $$ Barjenbruch
543 WGUS65 KBOU 312011 FFABOU Flood Watch National Weather Service Denver CO 211 PM MDT Sat Jul 31 2021 COZ043-312115- /O.CAN.KBOU.FF.A.0007.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central and South Weld County- Including the cities of Fort Lupton, Greeley, Eaton, and Roggen 211 PM MDT Sat Jul 31 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for Central and Southern Weld County has been cancelled. Heavy rain should stay farther west and closer to the Front Range. The threat of flash flooding has diminished. $$ COZ030>035-010300- /O.CON.KBOU.FF.A.0007.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jackson County Below 9000 Feet-West Jackson and West Grand Counties Above 9000 Feet-Grand and Summit Counties Below 9000 Feet-South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet-South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Including the cities of North Park, Rocky Mountain National Park, Mt Zirkel, Laramie and Medicine Bow Mountains, Red Feather Lakes, Breckenridge, Williams Fork Mountains, Glendevey, Indian Peaks, Nederland, Eisenhower Tunnel, Kremmling, East Slopes Southern Gore Range, Mount Evans, Grand Lake, Cameron Pass, East Slopes Mosquito Range, Berthoud Pass, Winter Park, Granby, Hot Sulphur Springs, Kenosha Mountains, Gould, Willow Creek Pass, Spicer, Rand, Estes Park, Dillon, Fraser, Walden, and Rabbit Ears Range 211 PM MDT Sat Jul 31 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING... The Flash Flood Watch continues for * Portions of central and north central Colorado, including the following areas, in central Colorado, Grand and Summit Counties Below 9000 Feet and South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet. In north central Colorado, Jackson County Below 9000 Feet, Larimer and Boulder Counties Between 6000 and 9000 Feet, South and East Jackson/Larimer/North and Northeast Grand/Northwest Boulder Counties Above 9000 Feet and West Jackson and West Grand Counties Above 9000 Feet. * Until 9 PM MDT this evening. * Additional rounds of showers and storms can be expected through this evening. The stronger storms will produce up to 1 inch of rain in an hour, but the persistent nature of showers and storms will still be capable of producing flash flooding, especially in burn areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ COZ036>041-010300- /O.CON.KBOU.FF.A.0007.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet-Central and Southeast Park County-Larimer County Below 6000 Feet/Northwest Weld County-Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County-North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County-Elbert/Central and East Douglas Counties Above 6000 Feet- Including the cities of Hartsel, Elbert, Westcreek, Arvada, Central City, Larkspur, Bailey, Evergreen, Georgetown, Lakewood, Aurora, Fairplay, Littleton, Brighton, Boulder, Highlands Ranch, Loveland, Kiowa, Longmont, Fondis, Denver International Airport, Golden, Parker, Castle Rock, City of Denver, Fort Collins, Nunn, Idaho Springs, Lake George, Hereford, and South Park 211 PM MDT Sat Jul 31 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING... The Flash Flood Watch continues for * Portions of central, north central, and northeast Colorado, including the following areas, in central Colorado, Central and Southeast Park County and Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet. In north central Colorado, Larimer County Below 6000 Feet/Northwest Weld County. In northeast Colorado, Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County, Elbert/Central and East Douglas Counties Above 6000 Feet and North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County. * Until 9 PM MDT this evening. * Additional showers and storms can be expected into early evening. The stronger storms will be capable of producing up to 1 inch of rain in 30 minutes. If showers or storms become more persistent, then there is still a threat of flash flooding. * Flash flooding will be possible in urban and low lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Never drive through a flooded area. && $$ Barjenbruch
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 4:59 PM MDT | Special Weather Statement | BOU | Jackson | 31 min |
| Jul 29, 5:21 PM MDT | Severe Thunderstorm Warning | BOU | Jackson | 24 min |
| Jul 29, 5:38 PM MDT | Areal Flood Advisory | BOU | Jackson, Larimer | 2 hr |
Nearby
Flash Flood Watches in Colorado, 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.