Alert archive / Colorado / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 41, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 29, 1990, 2:20 PM MDT for Douglas County, Colorado. It was in force for 40 min.
The area
The counties it named.
The facts
- Issued
- Jul 29, 1990, 2:20 PM MDT (20:20 UTC)
- Expired
- Jul 29, 1990, 3:00 PM MDT
- In force
- 40 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Douglas 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, 8.3 hours before the alert went out and 158 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.
- Mixed-layer CAPE
- 78 J/kg
- Mixed-layer CIN
- -243 J/kg
- Mixed-layer LCL
- 1188 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 292023
SVRDEN
COC035-292100-
BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
220 PM MDT SUN JUL 29 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 300 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTY OF EAST CENTRAL COLORADO:
SOUTHEASTERN DOUGLAS
INCLUDING THE FOLLOWING TOWNS/CITIES:
CASTLE ROCK..FRANKTOWN..AND LARKSPUR
AT 220 PM MDT RADAR INDICATED A SEVERE THUNDERSTORM 4 MILES SOUTHEAST
OF CASTLE ROCK...OR ABOUT 31 MILES SOUTH OF DENVER. MARBLE SIZE
HAIL HAS BEEN REPORTED WITH THIS STORM. THE STORM WAS MOVING SLOWLY
TOWARD THE EAST SOUTHEAST.
IF SEVERE WEATHER APPROACHES YOUR AREA...GO TO A STURDY
SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD PRONE AREAS.
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING
HAIL...DAMAGING WINDS OF OVER 60 MPH...DEADLY LIGHTNING...AND
HEAVY RAINS THAT CAN QUICKLY FLOOD A LOW LYING AREA.
INTENSE LIGHTNING IS REPORTED WITH THIS STORM. IF OUTDOORS...
STAY AWAY FROM HIGH OBJECTS. MOVE INDOORS IF POSSIBLE. WHEN
INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING
TELEPHONES AND ELECTRICAL EQUIPMENT.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR MOST OF EASTERN
COLORADO UNTIL 8 PM MDT.
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.
MARKKANEN
LAT...LON 3913 10465 3913 10507 3943 10487 3942 10465What 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 29, 1:35 PM MDT, 45 minutes before
COZALL-292100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 135 PM MDT SUNDAY JULY 29 1990 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 8 PM FOR MUCH OF EASTERN COLORADO... SATELLITE AND LIGHTNING DETECTORS SHOWED THUNDERSTORMS DEVELOPING AND MOVING ACROSS THE MOUNTAINS OF COLORADO AT 1PM. LIMON RADAR SHOWED THE LEADING EDGE OF THE THUNDERSTORMS ALONG THE FRONT RANGE FROM WEST OF FORT COLLINS TO WEST OF TRINIDAD. BY MID AFTERNOON THESE THUNDERSTORMS WILL SPREAD TO THE LOWER ELEVATIONS OF EASTERN COLORADO...WHERE MORE MOISTURE IS AVAILABLE AND THE AIRMASS IS VERY UNSTABLE. THUNDERSTORMS HAVE THE POTENTIAL TO CONTAIN LARGE HAIL...LOCALLY HEAVY RAINS...AND DAMAGING GUSTY WINDS. RESIDENTS OF EASTERN COLORADO SHOULD MONITOR THE WEATHER THROUGH THE AFTERNOON AND BE PREPARED TO TAKE COVER IF THREATENING WEATHER APPROACHES. A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MUCH OF EASTERN COLORADO UNTIL 8PM...INCLUDING THE CITIES AND TOWNS OF FORT COLLINS... METRO DENVER...CASTLE ROCK...COLORADO SPRINGS...PUEBLO...TRINIDAD... WALSENBURG...GREELEY...STERLING...AKRON...LIMON...FORT MORGAN... BENNETT...DEER TRAIL...KIOWA...LAS ANIMAS...ORDWAY...AND EADS%. RTG
Special weather statement, Jul 29, 1:58 PM MDT, 22 minutes before
COZ004-292100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 200 PM MDT SUNDAY JULY 29 1990 ...STRONG THUNDERSTORMS IN EASTERN PARK COUNTY... AT 155 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT STRONG THUNDERSTORMS HAD DEVELOPED IN EASTERN PARK COUNTY. THE MOST INTENSE STORM WAS LOCATED JUST SOUTH OF LAKE GEORGE...ABOUT 30 MILES WEST OF COLORADO SPRINGS...AND WAS MOVING TOWARD THE SOUTH SOUTHEAST AT ABOUT 15 MPH. THIS STORM IS CAPABLE OF PRODUCING INTENSE LIGHTNING...BRIEF HEAVY RAIN...STRONG GUSTY WINDS...AND HAIL. PERSONS IN EASTERN PARK COUNTY AND IN ADJACENT AREAS TO THE EAST IN TELLER COUNTY SHOULD BE PREPARED TO TAKE COVER IF A THUNDERSTNORM APPROACHES. A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF EASTERN COLORADO UNTIL 8PM. MARKKANEN
Special weather statement, Jul 29, 2:05 PM MDT, 15 minutes before
COZ011-014-292100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 210 PM MDT SUNDAY JULY 29 1990 ...HAIL PELTING DOWN YET AGAIN IN DOUGLAS COUNTY... AT 205 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT A STRONG THUNDERSTORM HAD DEVELOPED RAPIDLY IN CENTRAL DOUGLAS COUNTY. AT 2 PM A HAM RADIO OPERATOR REPORTED MARBLE SIZE HAIL FALLING ABOUT 5 MILES SOUTH OF CASTLE ROCK COLORADO...OR ABOUT 30 MILES SOUTH OF DENVER. THE STORM WAS MOVING SLOWLY TOWARD THE SOUTHEAST. PERSONS IN DOUGLAS COUNTY SHOULD WATCH FOR HEAVY RAIN...LIGHTNING... STRONG WINDS...AND HAIL. MORE THUNDERSTORMS ARE LIKELY TO DEVELOP IN DOUGLAS COUNTY AND FARTHER NORTH IN THE DENVER MEWTRO AREA DURING THE AFTERNOON...AND A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF EASTERN COLORADO UNTIL 8 PM. MARKKANEN
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.