Alert archive / Colorado / Flash Flood Watches in 2007

Flash Flood Watch 5, NWS Denver/Boulder, CO

July 28, 200716 counties in Colorado

NWS Denver/Boulder, CO issued this flash flood watch at Jul 28, 2007, 11:03 AM MDT for 16 counties in Colorado. It took effect at Jul 28, 2007, 12:00 PM MDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jul 28, 2007, 11:03 AM MDT (17:03 UTC)
In effect from: Jul 28, 2007, 12:00 PM MDT
Expired: Jul 29, 2007, 12:00 AM MDT
In force: 12 hr
Issued by: NWS Denver/Boulder, CO
Flood severity: None

Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 42 km from the middle of the area, began a volume at 17:06 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, 5.1 hours before the alert went out and 80 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: 27 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 939 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 38 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 Jul 28, 10:30 AM MDT, 33 minutes earlier.

Area forecast discussion, Jul 28, 10:30 AM MDT, 33 minutes before

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Hazardous weather outlook, Jul 28, 5:58 AM MDT, 5 hours 5 minutes before

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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
Jul 27, 7:26 PM MDT	Flash Flood Warning	BOU	Lincoln	64 min
Jul 27, 8:17 PM MDT	Flash Flood Warning	BOU	Lincoln	88 min
Jul 27, 8:53 PM MDT	Flash Flood Warning	BOU	Lincoln	82 min

Nearby

Flash Flood Watches in Colorado, 2007 Every flash flood watch in 2007

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.