Alert archive / Colorado / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 29, NWS Denver/Boulder, CO

July 31, 1986Yuma County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 31, 1986, 3:09 PM MDT for Yuma County, Colorado. It was in force for 66 min.

The area

The counties it named.

The facts

Issued
Jul 31, 1986, 3:09 PM MDT (21:09 UTC)
Expired
Jul 31, 1986, 4:15 PM MDT
In force
66 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County 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 12:00Z, 9.2 hours before the alert went out and 199 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 12:00Z on 1986-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1284 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 12:00Z on 1986-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 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
1284 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
1006 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
229 m²/s²
Significant tornado parameter
0.3
Supercell composite
4.5

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 31, 2:43 PM MDT, 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
240PM MDT THUR JUL 31 1986

...STRONG THUNDERSTORMS DEVELOPING OVER NORTHEASTERN COLORADO....

AT 230PM MDT THIS AFTERNOON RADAR INDICATED A CLUSTER OF STRONG
THUNDERSTORMS 30 MILES SOUTH SOUTHEAST OF STERLING COLORADO OR ABOUT
12 MILES EAST OF ARKON COLORADO. THESE STORMS WERE MOVING TO THE EAST
AT 5 MILES PER HOUR AND COULD PRODUCE LOCALLY HEAVY RAINFALL...STRONG
LIGHTNING AND SURBFACE WINDS. AT THE CURRENT SPEED...THE TOWNS OF YUMA
AND CLARKVILLE IN EASTERN WASHINGTON COUNTY COLORADO WILL BE AFFECTED IN
THE NEXT HOUR.

HECKMAN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 31, 4:14 PM MDTSevere Thunderstorm WarningBOUDouglas, Elbert61 min
Jul 31, 4:15 PM MDTSevere Thunderstorm WarningBOUEl Paso60 min
Jul 31, 4:32 PM MDTSevere Thunderstorm WarningBOUYuma58 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1986Every severe thunderstorm warning in 1986

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.