Alert archive / Colorado / Flash Flood Watches in 2008

Flash Flood Watch 5, NWS Denver/Boulder, CO

August 10, 200813 counties in Colorado

NWS Denver/Boulder, CO issued this flash flood watch at Aug 10, 2008, 4:10 AM MDT for 13 counties in Colorado. It took effect at Aug 10, 2008, 2:00 PM MDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Aug 10, 2008, 4:10 AM MDT (10:10 UTC)
In effect from: Aug 10, 2008, 2:00 PM MDT
Expired: Aug 10, 2008, 8:09 PM MDT
In force: 6 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, Jefferson County, CO, Larimer County, CO, Park County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 39 km from the middle of the area, began a volume at 10:09 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 00:00Z, 10.2 hours before the alert went out and 151 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 9 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 2636 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: -11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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, 3:30 PM MDT, 12 hours 40 minutes earlier.

Area forecast discussion, Aug 9, 3:30 PM MDT, 12 hours 40 minutes before

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Hazardous weather outlook, Aug 9, 11:19 AM MDT, 16 hours 51 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 4:02 PM MDT	Areal Flood Advisory	BOU	Morgan, Weld	118 min

Nearby

Flash Flood Watches in Colorado, 2008 Every 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.