Alert archive / Colorado / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 49, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Sep 1, 1990, 5:49 PM MDT for Morgan County, Weld County, Colorado. It was in force for 41 min.
The area
The counties it named.
The facts
- Issued
- Sep 1, 1990, 5:49 PM MDT (23:49 UTC)
- Expired
- Sep 1, 1990, 6:30 PM MDT
- In force
- 41 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Morgan County, CO, 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 12:00Z, 11.8 hours before the alert went out and 95 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
- 14 J/kg
- Mixed-layer CIN
- -269 J/kg
- Mixed-layer LCL
- 1981 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 104 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 012352
SVRDEN
COC087-123-020030-
BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
549 PM MDT SAT SEP 01 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 630 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:
NORTHWESTERN MORGAN
EAST CENTRAL WELD
INCLUDING THE FOLLOWING TOWNS/CITIES:
BRIGGSDALE..KEOTA..NEW RAYMER..AND STONEHAM
AT 549 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM 10 MILES SOUTH OF BRIGGSDALE...OR ABOUT 19
MILES EAST OF GREELEY.
THE STORM WAS MOVING NORTHEAST AT 20 TO 25 MPH AND WILL AFFECT THE
TOWN OF KEOTA BY 605 PM MDT.
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 361-06d63. DO NOT CALL THIS NUMBER FOR INFORMATION.
HEITKAMP
LAT...LON 4053 10357 4032 10423 4051 10448 4090 10396What 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, Sep 1, 3:13 PM MDT, 2 hours 36 minutes before
COZ011-010445- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 315PM MDT SAT SEP 1 1990 ...LINE OF THUNDERSTORMS FORMING SOUTHEAST OF DENVER... AT 3PM A LINE OF THUNDERSTORMS WAS FORMING SOUTHEAST OF DENVER FROM NORTHEAST DOUGLAS COUNTY TO NORTH CENTRAL ARAPAHOE COUNTY. THE STRONGEST OF THESE CELLS WAS NEAR THE TOWN OF PARKER. THESE STORMS CONTAIN CONSIDERABLE LIGHTNING AND GUSTY WINDS. BRIEF HEAVY RAIN AND SMALL HAIL MAY ALSO BE PRESENT. MOVEMENT ON THESE STORMS WAS TOWARD THE NORTHEAST AT 10 TO 20 MILES PER HOUR. PESONS IN NORTHEASTERN DOUGLAS...NORTHWESTERN ELBERT AND EASTERN APAPAHOE COUNTIES SHOULD BE ON THE LOOKOUT FOR INCLEMENT WEATHER FOR THE NEXT HOUR. LET
Special weather statement, Sep 1, 3:53 PM MDT, 1 hour 56 minutes before
COZ011-012-012230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 350 PM MDT SAT SEP 1 1990 ...STRONG THUNDERSTORMS IN PORTIONS OF NORTHEAST COLORADO... AT 345 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE FROM EXTREME NORTHEAST DOUGLAS COUNTY THROUGH CENTRAL ARAPAHOE AND INTO CENTRAL ADAMS COUNTY. THE STRONGEST STORM WAS LOCATED 5 MILES SOUTHEAST OF WATKINS...OR 20 MILES EAST OF DOWNTOWN DENVER. ALL OF THE THUNDERSTORMS WERE MOVING NORTHEAST AT 15 TO 25 MPH AND WILL BE AFFECTING PERSONS IN CENTRAL ARAPAHOE AND CENTRAL ADAMS COUNTIES. PEOPLE IN THE TOWNS OF MANILA AND BENNETT SHOULD BE ON THE LOOKOUT FOR THESE STORMS AS THEY ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN ...DEADLY LIGHTNING...HAIL...AND POSSIBLY A FEW FUNNEL CLOUDS. IF THREATENING WEATHER APPROACHES SEEK SHELTER IMMEDIATELY AND WAIT FOR THE STORM TO PASS. LOCALIZED STREET FLOODING IS ALSO A POSSIBILITY WITH THESE STORMS SO MOTORISTS SHOULD AVOID ROADS COVERED BY WATER. HEITKAMP
Special weather statement, Sep 1, 4:39 PM MDT, 1 hour 10 minutes before
COZ011-012-012315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 440 PM MDT SAT SEP 1 1990 ...STRONG THUNDERSTORM IN PORTIONS OF SOUTHEAST WELD COUNTY... AT 435 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS IN SOUTHEAST WELD COUNTY. THE STRONGEST THUNDERSTORM WAS LOCATED 6 MILES NORTHEAST OF KEENESBURG...OR 40 MILES NORTHEAST OF DOWNTOWN DENVER. THE THUNDERSTORM WAS MOVING NORTHEAST AT 15 TO 25 MPH AND WILL BE AFFECTING PEOPLE IN THE TOWN OF ROGGEN AND ALSO MOTORISTS TRAVELING ALONG STATE HIGHWAY 6 BETWEEN ROGGEN AND WIGGINS BY 445 PM MDT. PEOPLE IN THE THE ABOVE MENTIONED AREAS SHOULD BE ON THE LOOKOUT FOR THIS STORM AS IT IS CAPABLE OF PRODUCING BRIEF HEAVY RAIN...DEADLY LIGHTNING...HAIL...AND POSSIBLY A FEW FUNNEL CLOUDS. IF THREATENING WEATHER APPROACHES SEEK SHELTER IMMEDIATELY AND WAIT FOR THE STORM TO PASS. LOCALIZED STREET FLOODING IS ALSO A POSSIBILITY WITH THIS STORM SO MOTORISTS SHOULD AVOID ROADS COVERED BY WATER. 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.