Alert archive / Colorado / Flash Flood Warnings in 2024
Flash Flood Warning 26, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Aug 13, 2024, 3:03 PM MDT for Boulder County, Colorado. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 13, 2024, 3:03 PM MDT (21:03 UTC)
- Expired
- Aug 13, 2024, 5:17 PM MDT
- In force
- 2 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Boulder County, CO
The radar
The Denver radar (KFTG), 77 km from the middle of the area, began a volume at 21:07 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, 9.1 hours before the alert went out and 290 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
- 46 J/kg
- Mixed-layer CIN
- -185 J/kg
- Mixed-layer LCL
- 1235 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 128 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 warning 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 warning went out at Aug 13, 10:48 AM MDT, 4 hours 15 minutes earlier.
Area forecast discussion, Aug 13, 10:48 AM MDT, 4 hours 15 minutes before
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</html>Hazardous weather outlook, Aug 13, 10:37 AM MDT, 4 hours 26 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1037 AM MDT Tue Aug 13 2024 COZ030>051-141645- 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- 1037 AM MDT Tue Aug 13 2024 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Another round of thunderstorms is expected today. Heavy rain is likely with some of the storms, and there is also a higher threat of severe storms with large hail and damaging winds on the plains today. A Flood Watch will continue until 11 PM MDT tonight. Storms will develop over the mountains by early afternoon, with locally heavy rain the main threat. There is an elevated threat of flash flooding on the more sensitive burn areas with 1 to 2 inches of rain in an hour possible from the stronger storms. Storms will spread into the I-25 corridor in the mid to late afternoon, then across the plains in the late afternoon and evening. The threat of large hail and heavy rain will increase as the storms move eastward. The main severe threat for the Front Range cities will be from 3 PM to 7 PM, then across the plains from 5 PM to 9 PM. Hail up to golf ball size is possible, along with wind gusts to 60 mph and up to 3 inches of rain in under two hours. The greatest severe threat should be in a zone from eastern Weld and Logan counties south to around Limon in the late afternoon and early evening. While some showers and thunderstorms may linger after midnight, the threat of severe weather and heavy rain should be ended by then. .DAYS TWO THROUGH SEVEN...Wednesday through Monday A gradual warming and drying trend is expected to begin Wednesday continuing into Saturday. Scattered afternoon showers and storms are still possible Wednesday before the more significant drying begins Thursday. Moisture will begin to increase from the west Saturday afternoon and spread east Sunday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected today or tonight. However, any reports of heavy rainfall, flooding, or severe weather will be appreciated.
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 6:03 PM MDT | Tornado Warning | BOU | Weld | 27 min |
| Aug 12, 6:07 PM MDT | Areal Flood Advisory | BOU | Morgan | 30 min |
| Aug 12, 6:22 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 23 min |
| Aug 12, 6:25 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 3 hr |
| Aug 12, 6:30 PM MDT | Tornado Warning | BOU | Weld | 13 min |
| Aug 12, 6:37 PM MDT | Flash Flood Warning | BOU | Morgan | 3 hr |
| Aug 12, 6:41 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 34 min |
| Aug 12, 6:43 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 32 min |
| Aug 12, 6:44 PM MDT | Areal Flood Advisory | BOU | Elbert, Lincoln | 5 min |
| Aug 12, 6:49 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 2 hr |
| Aug 12, 6:50 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 40 min |
| Aug 12, 6:58 PM MDT | Flash Flood Warning | BOU | Weld | 3 hr |
| Aug 12, 7:09 PM MDT | Flash Flood Warning | BOU | Morgan, Washington | 3 hr |
| Aug 12, 7:14 PM MDT | Tornado Warning | BOU | Lincoln | 16 min |
| Aug 12, 7:15 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 45 min |
| Aug 12, 7:24 PM MDT | Tornado Warning | BOU | Morgan | 36 min |
| Aug 12, 7:28 PM MDT | Tornado Warning | BOU | Lincoln | 32 min |
| Aug 12, 7:32 PM MDT | Flash Flood Warning | BOU | Elbert, Lincoln | 3 hr |
| Aug 12, 7:58 PM MDT | Special Weather Statement | BOU | Larimer | 47 min |
| Aug 12, 7:59 PM MDT | Areal Flood Advisory | BOU | Larimer | 2 hr |
| Aug 12, 7:59 PM MDT | Special Weather Statement | BOU | Morgan | 46 min |
| Aug 12, 8:02 PM MDT | Special Weather Statement | BOU | Morgan | 43 min |
| Aug 12, 8:04 PM MDT | Special Weather Statement | BOU | Weld | 41 min |
| Aug 12, 8:10 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 50 min |
| Aug 12, 8:24 PM MDT | Areal Flood Advisory | BOU | Morgan, Weld | 3 hr |
| Aug 12, 8:56 PM MDT | Areal Flood Advisory | BOU | Lincoln | 2 hr |
| Aug 12, 9:33 PM MDT | Areal Flood Advisory | BOU | Weld | 3 hr |
| Aug 12, 10:06 PM MDT | Areal Flood Warning | BOU | Morgan, Washington | 3 hr |
| Aug 12, 10:19 PM MDT | Areal Flood Warning | BOU | Elbert, Lincoln | 3 hr |
| Aug 12, 11:11 PM MDT | Flash Flood Warning | BOU | Weld | 4 hr |
| Aug 13, 3:03 AM MDT | Areal Flood Warning | BOU | Weld | 3 hr |
| Aug 13, 10:29 AM MDT | Flood Watch | BOU | Arapahoe, Boulder, Broomfield, Clear Creek, Douglas, Elbert and 9 more | 10 hr |
| Aug 13, 3:23 PM MDT | Special Weather Statement | BOU | Larimer | 52 min |
| Aug 13, 3:35 PM MDT | Special Weather Statement | BOU | Arapahoe | 25 min |
| Aug 13, 3:44 PM MDT | Areal Flood Advisory | BOU | Larimer | 101 min |
| Aug 13, 3:46 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 44 min |
| Aug 13, 3:50 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe | 40 min |
| Aug 13, 3:59 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 44 min |
| Aug 13, 4:13 PM MDT | Flash Flood Warning | BOU | Weld | 3 hr |
| Aug 13, 4:25 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 37 min |
| Aug 13, 4:26 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 49 min |
| Aug 13, 4:30 PM MDT | Areal Flood Advisory | BOU | Elbert | 3 hr |
| Aug 13, 5:18 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan, Washington | 42 min |
| Aug 13, 5:25 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert, Lincoln, Washington | 50 min |
| Aug 13, 5:57 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 48 min |
Nearby
Flash Flood Warnings in Colorado, 2024Every flash flood warning in 2024
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.