Alert archive / Colorado / Flash Flood Watches in 2008
Flash Flood Watch 4, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood watch at Aug 9, 2008, 11:40 AM MDT for 7 counties in Colorado. It took effect at Aug 9, 2008, 12:00 PM MDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Aug 9, 2008, 11:40 AM MDT (17:40 UTC)
- In effect from
- Aug 9, 2008, 12:00 PM MDT
- Expired
- Aug 9, 2008, 7:59 PM MDT
- In force
- 8 hr
- Issued by
- NWS Denver/Boulder, CO
- Flood severity
- None
Counties Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Gilpin County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO
The radar
The Denver radar (KFTG), 74 km from the middle of the area, began a volume at 17:44 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 5.7 hours before the alert went out and 435 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
- 315 J/kg
- Mixed-layer CIN
- -94 J/kg
- Mixed-layer LCL
- 668 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 56 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
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 Aug 9, 3:22 AM MDT, 8 hours 18 minutes earlier.
Area forecast discussion, Aug 9, 3:22 AM MDT, 8 hours 18 minutes before
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</html>The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 6:33 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 42 min |
| Aug 8, 7:15 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 45 min |
| Aug 8, 7:19 PM MDT | Areal Flood Advisory | BOU | Morgan | 116 min |
| Aug 8, 7:29 PM MDT | Flash Flood Warning | BOU | Morgan | 3 hr |
| Aug 8, 7:30 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Denver, Jefferson | 90 min |
| Aug 8, 7:51 PM MDT | Flash Flood Warning | BOU | Arapahoe, Denver | 94 min |
| Aug 8, 7:59 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan, Weld | 39 min |
| Aug 8, 8:10 PM MDT | Areal Flood Advisory | BOU | Adams | 95 min |
| Aug 8, 8:16 PM MDT | Areal Flood Advisory | BOU | Morgan, Washington | 119 min |
| Aug 8, 8:49 PM MDT | Areal Flood Advisory | BOU | Arapahoe | 116 min |
| Aug 8, 9:03 PM MDT | Areal Flood Advisory | BOU | Washington | 117 min |
| Aug 8, 9:19 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 41 min |
| Aug 8, 9:54 PM MDT | Areal Flood Advisory | BOU | Adams | 96 min |
| Aug 8, 9:59 PM MDT | Areal Flood Advisory | BOU | Elbert, Lincoln | 2 hr |
| Aug 8, 10:23 PM MDT | Areal Flood Warning | BOU | Adams, Arapahoe, Denver | 3 hr |
| Aug 8, 10:48 PM MDT | Areal Flood Advisory | BOU | Arapahoe | 117 min |
| Aug 8, 11:01 PM MDT | Areal Flood Advisory | BOU | Washington | 89 min |
| Aug 9, 5:42 PM MDT | Areal Flood Advisory | BOU | Douglas, Jefferson, Park | 3 hr |
Nearby
Flash Flood Watches in Colorado, 2008Every flash flood watch in 2008
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.