Alert archive / Colorado / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 10, NWS Denver/Boulder, CO

June 9, 1987Denver County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 9, 1987, 3:30 PM MDT for Denver County, Colorado. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jun 9, 1987, 3:30 PM MDT (21:30 UTC)
Expired
Jun 9, 1987, 4:30 PM MDT
In force
60 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County Denver 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

Fort Carson/Butt, CO (KFCS), launched 12:00Z, 9.5 hours before the alert went out and 121 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, Fort Carson/Butt, CO at 12:00Z on 1987-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 51 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Carson/Butt, CO at 12:00Z on 1987-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 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
51 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
690 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
141 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.

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 9, 12:14 PM MDT, 3 hours 16 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE  DENVER CO
1210PM MDT   TUESDAY   JUNE 9 1987

             ...HEAVY RAIN IN MORGAN COUNTY COLORADO...

RADAR SHOWS A BAND OF HEAVY SHOWERS LOCATED OVER WESTERN MORGAN COUNTY.
THIS BAND IS VERY NARROW AND IS LOCATED FROM GOODRICH AND JACKSON
RESERVOIR TO ABOUT WIGGINS COLORADO.  A SPOTTER AT JACKSON LAKE REPORTED
VERY HEAVY RAIN AT NOON WITH 2 INCHES THUS FAR.  THESE SHOWERS HAVE
SHOWN VERY LITTLE MOVEMENT SINCE THEY FORMED.

PERSONS IN WESTERN MORGAN COUNTY SHOULD AVOID LOW LYING AREAS AND SMALL
STREAMS AS THIS HEAVY RAIN MAY CAUSE LOCAL FLOODING.  MOTORISTS ON I-76
AND OTHER ROADS SHOULD DRIVE WITH CAUTION AND AVOID UNDERPASSES AND BE
ALERT FOR FLOODING OF STREET INTERSECTIONS.  ALL PERSONS IN ESSTERN
COLORADO SHOULD CONTINUE TO MONITOR LOCAL RADIO AND TV BROADCASTS OR
NOAA WEATHER RADIO FOR FUTURE STATEMENTS AND WARNINGS.  A FLASH FLOOD
WATCH REMAINS POSTED FOR THE EASTERN FOOTHILLS AND ADJACENT PLAINS
BELOW 7000 FEET FOR THIS AFTERNOON AND EVENING.
Special weather statement, Jun 9, 1:11 PM MDT, 2 hours 19 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE  DENVER CO
110PM MDT TUESDAY   JUNE 9 1987

             ...LOCALLY HEAVY RAINS CONTINUE IN EASTERN COLORADO...

HEAVY THUNDERSTORMS CONTINUE IN MORGAN COUNTY WITH THE HEAVIEST STORM
AT 1PM REPORTED 10 MILES SOUTHWEST OF FORT MORGAN. LOCALLY HEAVY
SHOWERS AND THUNDERSTORMS ARE ARE DEVELOPING THROUGHOUT MUCH OF EASTERN
COLORADO AND DURING THE PAST HOUR HAVE BEGUN FORMING ALONG THE EASTERN
FOOTHILLS. THESE STORMS ARE MOVING MOSTLY TOWARD THE NORTH NORTHEAST
AT AROUND 10 TO 20 MILES PER HOUR.

THE FLASH FLOOD WATCH VALID FROM 3PM TO 9PM THIS AFTERNOON ALONG
MUCH OF THE EASTERN FOOTHILLS BELOW 7500 FEET REMAINS IN EFFECT.
STAY TUNED TO RADIO OR TV FOR FURTHER INFORMATION.

TUNNELL
Special weather statement, Jun 9, 2:44 PM MDT, 46 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE  DENVER CO
3PM MDT TUESDAY   JUNE 9 1987

             ...WIDESPREAD RAIN OVER EASTERN COLORADO...

LOCALLY HEAVY SHOWERS AND THUNDERSTORMS CONTINUED OVER EASTERN
COLORADO AT 3PM WITH THE HEAVIEST STORM 3 MILES SOUTHEAST OF MERINO
IN LOGAN COUNTY. OTHER HEAVY SHOWERS WERE SPOTTED THROUGHOUT THE EASTERN
PLAINS AND WERE BEGINNING TO DEVELOP IN WESTERN JEFFERSON COUNTY. THESE
STORMS ARE MOVING MOSTLY TOWARD THE NORTH AT AROUND 15 TO 20 MILES PER
HOUR.

THE FLASH FLOOD WATCH VALID FROM 3PM TO 9PM THIS AFTERNOON ALONG
MUCH OF THE EASTERN FOOTHILLS BELOW 7500 FEET REMAINS IN EFFECT.
STAY TUNED TO RADIO OR TV FOR FURTHER INFORMATION.

TUNNELL


The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 3:30 PM MDTSevere Thunderstorm WarningBOUArapahoe, Douglas, Jefferson60 min
Jun 9, 4:11 PM MDTTornado WarningBOUAdams, Arapahoe29 min
Jun 9, 4:17 PM MDTTornado WarningBOUArapahoe, Douglas28 min
Jun 9, 4:41 PM MDTTornado WarningBOUArapahoe29 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1987Every severe thunderstorm warning in 1987

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.