Alert archive / Colorado / Flash Flood Warnings in 1998

Flash Flood Warning 21, NWS Denver/Boulder, CO

July 31, 1998Clear Creek County, Gilpin County, Jefferson County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jul 31, 1998, 3:15 PM MDT for Clear Creek County, Gilpin County, Jefferson County, Colorado. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 31, 1998, 3:15 PM MDT (21:15 UTC)
Expired
Jul 31, 1998, 4:15 PM MDT
In force
60 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Clear Creek County, CO, Gilpin County, CO, Jefferson County, CO

The radar

The Denver radar (KFTG), 80 km from the middle of the area, began a volume at 21:14 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, 9.3 hours before the alert went out and 192 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, Denver, CO at 12:00Z on 1998-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 54 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, Denver, CO at 12:00Z on 1998-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 square meters per square second.193958Sfc1 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
54 J/kg
Mixed-layer CIN
-239 J/kg
Mixed-layer LCL
728 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 6:00 PM MDTFlash Flood WarningBOULincoln45 min
Jul 30, 6:00 PM MDTSevere Thunderstorm WarningBOULincoln45 min
Jul 30, 7:27 PM MDTFlash Flood WarningBOULincoln93 min
Jul 30, 8:56 PM MDTFlash Flood WarningBOULincoln2 hr
Jul 31, 3:15 PM MDTSevere Thunderstorm WarningBOUClear Creek, Gilpin, Jefferson60 min
Jul 31, 5:05 PM MDTFlash Flood WarningBOUJefferson85 min
Jul 31, 5:50 PM MDTFlash Flood WarningBOUDouglas85 min

Nearby

Flash Flood Warnings in Colorado, 1998Every flash flood warning in 1998

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.