Alert archive / Colorado / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 31, NWS Denver/Boulder, CO

June 25, 1989Logan County, Washington County, Yuma County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 25, 1989, 8:15 PM MDT for Logan County, Washington County, Yuma County, Colorado. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jun 25, 1989, 8:15 PM MDT (02:15 UTC)
Expired
Jun 25, 1989, 9:15 PM MDT
In force
60 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Logan County, CO, Washington County, CO, Yuma County, CO

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.3 hours before the alert went out and 219 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, N. Platte/Lee Bi, NE at 00:00Z on 1989-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2940 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, N. Platte/Lee Bi, NE at 00:00Z on 1989-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 233 square meters per square second.19395878Sfc1 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
2940 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
971 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
233 m²/s²
0-3 km storm-relative helicity
363 m²/s²
Significant tornado parameter
6.9
Supercell composite
28.2

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
Jun 26, 12:35 PM MDTSevere Thunderstorm WarningBOUJefferson40 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1989Every severe thunderstorm warning in 1989

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.