Alert archive / Colorado / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 40, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 27, 1990, 6:34 PM MDT for Weld County, Colorado. It was in force for 41 min.
The area
The counties it named.
The facts
- Issued
- Jul 27, 1990, 6:34 PM MDT (00:34 UTC)
- Expired
- Jul 27, 1990, 7:15 PM MDT
- In force
- 41 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Weld 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 00:00Z, 0.6 hours before the alert went out and 125 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3328 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -71 m²/s²
- 0-3 km storm-relative helicity
- -83 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 280038
SVRDEN
COC123-280115-
BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
634 PM MDT FRI JUL 27 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 715 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:
SOUTH CENTRAL WELD
INCLUDING THE FOLLOWING TOWNS/CITIES:
EVANS..GARDEN CITY..GILCREST..GREELEY..KERSEY..AND LA SALLE
AT 0634 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM 2 MILES SOUTH OF LA SALLE...OR ABOUT 7
MILES SOUTH OF GREELEY.
THE STORM WAS MOVING EAST AT 15 TO 20 MPH AND WILL BE AFFECTING
THE TOWN OF KERSEY WITHIN THE NEXT 10 TO 15 MINUTES.
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.
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.
HEITKAMP
LAT...LON 4014 10417 4024 10476 4044 10476 4048 10416What 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 27, 3:12 PM MDT, 3 hours 22 minutes before
COZ011-012-272230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 315 PM MDT FRIDAY JULY 27 1990 ...THUNDERSTORMS DEVELOPING EAST OF DENVER... AT 310 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF THUNDERSTORMS DEVELOPING IN NORTHEASTERN COLORADO. THE LINE EXTENDED FROM JUST SOUTHWEST OF FORT MORGAN IN MORGAN COUNTY...THROUGH CENTRAL ADAMS AND ARAPAHOE COUNTY...AND PAST CASTLE ROCK INTO SOUTHWESTERN DOUGLAS COUNTY. THE STRONGEST STORMS WERE IN ADAMS COUNTY NEAR STRASBURG...ABOUT 30 MILES EAST OF DENVER. THE STORMS WERE MOVING TOWARD THE EAST AT ABOUT 15 MPH. THESE STORMS MAY PRODUCE HEAVY RAIN...HAIL...DANGEROUS LIGHTNING...AND STRONGx WINDS UNTIL AT LEAST 430 PM MDT. PERSONS ALONG AND JUST TO THE EAST OF THE LINE SHOULD SEEK SHELTER IF THUNDERSTORMS APPROACH. MARKKANEN
Special weather statement, Jul 27, 6:05 PM MDT, 29 minutes before
COZ011-012-280030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 600 PM MDT FRIDAY JULY 27 1990 ...THUNDERSTORMS CONTINUING TO DEVELOP IN PORTIONS OF NORTHEAST COLORADO... AT 555 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED AN AREA OF DEVELOPING THUNDERSTORMS IN PORTIONS OF NORTHEAST COLORADO. THE AREA OF THUNDERSTORMS WERE ALONG A LINE FROM FORT COLLINS IN SOUTHEAST LARIMER COUNTY TO FORT LUPTON...25 MILES NORTHEAST OF DOWNTOWN DENVER ...IN SOUTHERN WELD COUNTY. THE STRONGEST STROM WAS LOCATED 7 MILES SOUTHEAST OF FORT COLLINS. PEOPLE IN SOUTHEAST LARIMER...NORTHCENTRAL ADAMS...AND WELD COUNTIES SHOULD BE ON THE LOOKOUT FOR THESE STORMS AS THEY ARE CAPABLE OF PRODUCING HEAVY RAIN...HAIL...DEADLY LIGHTNING...AND STRONG GUSTY WINDS. IF THREATENING WEATHER APPROACHES YOUR AREA GO INSIDE YOUR SHELTER AND WAIT FOR THE STORMS TO PASS. HEITKAMP
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.