Alert archive / Colorado / Flash Flood Watches in 2022
Flash Flood Watch 3, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood watch at Jul 27, 2022, 2:43 PM MDT for 9 counties in Colorado. It took effect at Jul 28, 2022, 11:00 AM MDT. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Jul 27, 2022, 2:43 PM MDT (20:43 UTC)
- In effect from
- Jul 28, 2022, 11:00 AM MDT
- Expired
- Jul 28, 2022, 9:28 PM MDT
- In force
- 10 hr
- Issued by
- NWS Denver/Boulder, CO
- Flood severity
- None
Counties Boulder County, CO, Clear Creek County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO
The radar
The Denver radar (KFTG), 102 km from the middle of the area, began a volume at 20:46 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
Grand Junction, CO (KGJT), launched 12:00Z, 8.7 hours before the alert went out and 254 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
- 48 J/kg
- Mixed-layer CIN
- -235 J/kg
- Mixed-layer LCL
- 2016 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- -11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Denver/Boulder, CO wrote its last area forecast discussion before this flash flood watch went out at Jul 27, 11:52 AM MDT, 2 hours 51 minutes earlier.
Area forecast discussion, Jul 27, 11:52 AM MDT, 2 hours 51 minutes before
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</html>Hazardous weather outlook, Jul 27, 10:55 AM MDT, 3 hours 48 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1055 AM MDT Wed Jul 27 2022 COZ030>051-281700- 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- 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- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 1055 AM MDT Wed Jul 27 2022 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight There will be a chance of thunderstorms mainly over the northeast plains late this afternoon and evening. A few storms may become severe. Damaging wind gusts to 60 mph and heavy rainfall and localized flash flooding. Hail up to quarter size is also possible with a low tornado threat for the far northeast corner. It is difficult to assess how all this will play out. It looks like the best coverage will be over the northeast plains by early this evening, with the potential for storms developing into the urban corridor mid to late evening. Shower and thunderstorm coverage will slowly decrease after midnight. There is a limited risk of flash flooding primarily in the Cameron and Calwood burn areas this afternoon and evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Numerous showers and thunderstorms are expected Thursday and Friday. Heavy rain, small hail, and wind gusts to 50 mph will accompany the stronger storms. The main threat will be heavy rain that leads to flashing flooding in the burn areas. Heavy rain will may also produce isolated flooding across the Front Range and northeast Colorado. The amount of storms and storm intensity decrease Saturday, but the flash flooding threat will linger for the burn areas. A warmer and drier period is expect for Sunday and early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight but rainfall reports would be greatly appreciated.
In the hours before
Special weather statement, Jul 27, 2:35 PM MDT, 8 minutes before
Special Weather Statement
National Weather Service Denver CO
235 PM MDT Wed Jul 27 2022
COZ041-045-046-272230-
Elbert/Central and East Douglas Counties Above 6000 Feet CO-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-Central and East Adams and Arapahoe Counties CO-
235 PM MDT Wed Jul 27 2022
...Brief landspout tornadoes possible...
Conditions will be favorable for the development of landspout
tornadoes in eastern Douglas, northwest Elbert, and central Arapahoe
counties over the next couple of hours. At this time, it is unkown
which if any storm would produce a landspout. Any landspouts that
develop are expected to pose a limited threat.
HAZARD...Landspouts possible.
SOURCE...Radar indicated.
IMPACT...Landspout tornadoes can damage mobile homes, roofs,
vehicles, and trees. Outdoor objects may be tossed about.
Locations impacted include...
Southeastern Castle Rock, Bennett, Elizabeth, Larkspur, Ponderosa
Park, Franktown, The Pinery and Strasburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
If a tornado is spotted seek shelter inside a sturdy building.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Denver Colorado.
&&
LAT...LON 3925 10493 3961 10457 3961 10456 3958 10455
3958 10453 3967 10451 3977 10441 3963 10419
3913 10470
TIME...MOT...LOC 2032Z 240DEG 48KT 3944 10446
LANDSPOUT...POSSIBLE
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<30 MPH
RODRIGUEZThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 6:29 PM MDT | Special Weather Statement | BOU | Lincoln | 46 min |
| Jul 26, 6:41 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 34 min |
| Jul 26, 6:50 PM MDT | Areal Flood Advisory | BOU | Douglas | 115 min |
| Jul 26, 7:24 PM MDT | Special Weather Statement | BOU | Lincoln | 66 min |
| Jul 26, 8:28 PM MDT | Special Weather Statement | BOU | Broomfield | 32 min |
| Jul 26, 8:45 PM MDT | Special Weather Statement | BOU | Denver | 30 min |
| Jul 26, 9:37 PM MDT | Areal Flood Advisory | BOU | Douglas, Jefferson | 3 hr |
| Jul 26, 10:48 PM MDT | Areal Flood Advisory | BOU | Adams, Denver, Jefferson | 87 min |
| Jul 26, 11:12 PM MDT | Areal Flood Advisory | BOU | Douglas | 2 hr |
| Jul 26, 11:22 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Denver, Jefferson | 113 min |
| Jul 26, 11:30 PM MDT | Areal Flood Advisory | BOU | Boulder, Weld | 105 min |
| Jul 27, 2:27 PM MDT | Areal Flood Advisory | BOU | Larimer | 3 hr |
| Jul 27, 2:35 PM MDT | Special Weather Statement | BOU | Arapahoe | 115 min |
| Jul 27, 4:15 PM MDT | Special Weather Statement | BOU | Arapahoe | 45 min |
| Jul 27, 4:24 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 51 min |
| Jul 27, 5:10 PM MDT | Special Weather Statement | BOU | Weld | 50 min |
| Jul 27, 5:25 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 50 min |
| Jul 27, 5:58 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 29 min |
Nearby
Flash Flood Watches in Colorado, 2022Every flash flood watch in 2022
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.