Alert archive / Colorado / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 25, NWS Denver/Boulder, CO

June 15, 1990Logan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 15, 1990, 4:05 PM MDT for Logan County, Colorado. It was in force for 40 min.

The area

The counties it named.

The facts

Issued
Jun 15, 1990, 4:05 PM MDT (22:05 UTC)
Expired
Jun 15, 1990, 4:45 PM MDT
In force
40 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County Logan 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

Denver, CO (KDEN), launched 12:00Z, 10.1 hours before the alert went out and 96 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 1990-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 810 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 1990-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
810 J/kg
Mixed-layer CIN
-164 J/kg
Mixed-layer LCL
1002 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDEN 152207
SVRDEN
COC075-152245-

BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
405 PM MDT FRI JUN 15 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 443 PM  MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:

     NORTHWESTERN LOGAN

INCLUDING THE FOLLOWING TOWNS/CITIES:

     PEETZ 
     PADRONI

THE STORM WAS LOCATED 16 MILES SOUTHWEST OF PEETZ..WHICH IS 16
MILES NORTHWEST OF STERLING.

AT 4PM DOPPLER RADAR INDICATED THIS STORM TO BE VERY RAPIDLY
DEVELOPING...AND MOVING TO THE NORTHEAST AT 20 MPH.  LARGE HAIL 
AND DAMAGING WINDS CAN BE EXPECTED WITH THIS STORM. 

A TORNADO WATCH IS IN EFFECT FOR NORTHEAST COLORADO UNTIL 8PM.  
THIS STORM COULD PRODUCE A TORNADO WITH LITTLE OR NO ADVANCE
WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE
OF SAFETY IF ONE IS SPOTTED.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE
IN DENVER..OR CALL YOUR REPORT TO THE NATIONAL WEATHER SERVICE
AT 361-0663.  DO NOT CALL THIS NUMBER FOR INFORMATION.

RTG

LAT..LON  4068 10314 4065 10352 4100 10341 4100 10309

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, Jun 15, 11:11 AM MDT, 4 hours 54 minutes before
COZ011>014-152000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1110 AM MDT FRI JUN 15 1990

...SEVERE WEATHER THREAT IN THE NORTHEAST THIS AFTERNOON AND EVENING...

PLENTIFUL MOISTURE COMBINED WITH AN UPPER LEVEL SYSTEM MOVING THROUGH
THE AREA THIS AFTERNOON AND EVENING WILL CAUSE THUNDERSTORMS TO DEVELOP.
SOME OF THESE THUNDERSTORMS MAY BECOME SEVERE CAPABLE OF PRODUCING LARGE
HAIL...DAMAGING WINDS...DEADLY LIGHTNING AND POSSIBLY A FEW TORNADOES.

THE AREA WITH THE HIGHEST RISK IS THE NORTHEAST...FROM THE FOOTHILLS
EAST TO THE EASTERN BORDER AND FROM LIMON TO THE NORTHERN BORDER.

PERSONS SHOULD BE ALERT TO THIS POTENTIAL FOR SEVERE WEATHER AND LISTEN
TO NOAA WEATHER RADIO...TELEVISION...OR COMMERCIAL RADIO FOR LATER
STATEMENTS...WATCHES OR WARNINGS.

HEITKAMP

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 14, 6:05 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld45 min
Jun 14, 6:50 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld45 min
Jun 14, 8:15 PM MDTSevere Thunderstorm WarningBOUWashington40 min
Jun 14, 8:50 PM MDTSevere Thunderstorm WarningBOUWashington, Yuma40 min
Jun 15, 5:10 PM MDTSevere Thunderstorm WarningBOUSedgwick20 min
Jun 15, 5:55 PM MDTSevere Thunderstorm WarningBOUWeld45 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1990Every severe thunderstorm warning in 1990

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.