Alert archive / Colorado / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 50, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Sep 1, 1990, 7:13 PM MDT for 4 counties in Colorado. It was in force for 47 min.
The area
The counties it named.
The facts
- Issued
- Sep 1, 1990, 7:13 PM MDT (01:13 UTC)
- Expired
- Sep 1, 1990, 8:00 PM MDT
- In force
- 47 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Logan County, CO, Morgan County, CO, Washington 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 00:00Z, 1.2 hours before the alert went out and 66 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
- 239 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 2179 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 341 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 020115
SVRDEN
COC121-087-123-075-020200-
BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
713 PM MDT SAT SEP 01 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 800 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:
NORTH WEST WASHINGTON
EASTERN MORGAN
EXTREME EAST CENTRAL WELD
SOUTHWESTERN LOGAN
INCLUDING THE FOLLOWING TOWNS/CITIES:
ATWOOD..BRUSH..FORT MORGAN..HILLROSE..MERINO..NEW RAYMER...
STERLING..STONEHAM..AND WILLARD
AT 0710PM MDT 1 INCH DIAMETER HAIL WAS SPOTTED 2 MILES WEST OF THE
TOWN OF FORT MORGAN. RADAR ALSO INDICATED A SEVERE THUNDERSTORM IN
THIS AREA. THE THUNDERSTORM HAS BEEN MOVING TO THE NORTHEAST AT
20-25 MPH.
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.
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.
GCF...WSFO DENVER
LAT...LON 4031 10295 4004 10374 4048 10396 4088 10331What 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, 4 hours 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, 3 hours 20 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, 2 hours 34 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
Special weather statement, Sep 1, 7:03 PM MDT, 10 minutes before
COZ011-012-012315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 7PM MDT SATURDAY SEPT 1 1990 ...STRONG THUNDERSTORM CONTINUE TO RUMBLE IN NORTHEAST COLORADO... AT 7PM MDT SEVERAL VERY STRONG THUNDERSTORMS CONTINUE TO ROLL ACROSS THE PLAINS OF NORTHEAST COLORADO. ONE INTENSE THUNDERSTORM CELL WAS LOCATED IN EASTERN WELD COUNTY ABOUT 10 MILES NORTHEAST OF NEW RAYMER OR 35 MILES WEST OF STERLING COLORADO. INTENSE THUNDERSTORMS WERE ALSO LOCATED 5 MILES NORTHEAST AND 4 MILES SOUTHWEST OF FORT MORGAN IN MORGAN COUNTY. A FOURTH INTENSE THUNDERSTORM WAS LOCATED 8 MILES NORTH OF FORT LUPTON...OR 30 MILES NORTH OF DENVER. ALL THESE THUNDERSTORMS WERE MOVING TO THE NORTHEAST AT A RATE OF 20-25 MPH. PERSONS IN NORTHEAST COLORADO ESPECIALLY IN WELD AND MORGAN COUNTIES SHOULD BE ALERT FOR THESE STORMS AND MOVE INDOORS IF THREATENING WEATHER APPROACHES. THESE THUNDERSTORMS ARE PRODUCING FREQUENT LIGHTNING AND POSSIBLY HAIL. HEAVY RAIN AND PERHAPS EVEN A FEW FUNNEL CLOUDS MAY ALSO ACCOMPANY THESE THUNDERSTORMS. MOTORISTS ON I-76 IN MORGAN COUNTY AS WELL AS OTHER STREETS AND ROADS IN NORTHEAT COLORADO IN MORGAN AND WELD COUNTIES SHOULD BE ALERT FOR HEAVY RAIN CAUSING LOCALIZED FLOODING OF STREETS AND HIGHWAYS ESPECIALLY IN LOW LYING AREAS. END...GCF...WSFO DENVER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 4:01 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Gilpin, Grand | 29 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.