Alert archive / Colorado / Areal Flood Advisories in 2021

Areal Flood Advisory 166, NWS Denver/Boulder, CO

August 2, 2021Park County, Colorado

NWS Denver/Boulder, CO issued this areal flood advisory at Aug 2, 2021, 5:18 PM MDT for Park County, Colorado. It was in force for 87 min.

The area

The counties it named.

The facts

Issued
Aug 2, 2021, 5:18 PM MDT (23:18 UTC)
Expired
Aug 2, 2021, 6:45 PM MDT
In force
87 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon

County Park County, CO

The radar

The Denver radar (KFTG), 125 km from the middle of the area, began a volume at 23:18 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, 11.3 hours before the alert went out and 240 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-pSkew-T log-p diagram, Grand Junction, CO at 12:00Z on 2021-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 22 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 2021-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
22 J/kg
Mixed-layer CIN
-62 J/kg
Mixed-layer LCL
1085 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 2:40 PM MDTAreal Flood AdvisoryBOUGrand95 min
Aug 2, 3:38 PM MDTAreal Flood AdvisoryBOUGrand82 min
Aug 2, 3:47 PM MDTFlash Flood WarningBOUJackson, Larimer3 hr
Aug 2, 4:11 PM MDTFlash Flood WarningBOULarimer3 hr
Aug 2, 4:16 PM MDTAreal Flood AdvisoryBOUGrand89 min
Aug 2, 5:08 PM MDTAreal Flood AdvisoryBOUBoulder, Grand82 min
Aug 2, 5:14 PM MDTAreal Flood AdvisoryBOULarimer91 min
Aug 2, 5:40 PM MDTAreal Flood AdvisoryBOUBoulder, Grand, Larimer95 min
Aug 2, 5:57 PM MDTAreal Flood AdvisoryBOULarimer93 min

Nearby

Areal Flood Advisories in Colorado, 2021Every areal flood advisory in 2021

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.