Alert archive / Colorado / Severe Thunderstorm Warnings in 1989
Severe Thunderstorm Warning 2, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 24, 1989, 10:47 PM MDT for Logan County, Morgan County, Colorado. It was in force for 58 min.
The area
The counties it named.
The facts
- Issued
- Apr 24, 1989, 10:47 PM MDT (04:47 UTC)
- Expired
- Apr 24, 1989, 11:45 PM MDT
- In force
- 58 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Logan County, CO, Morgan 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, 4.8 hours before the alert went out and 72 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
- 247 J/kg
- Mixed-layer CIN
- -154 J/kg
- Mixed-layer LCL
- 3217 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 250447
SVRDEN
COC075-087-250545-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
1047 PM MDT MON APR 24 1989
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 1145 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN THE NORTHEAST PART OF COLORADO
SOUTHWEST LOGAN...NORTHERN MORGAN
THIS WARNING INCLUDES THE FOLLOWING TOWNS AND CITIES... FORT MORGAN
...BRUSH...MERINO
AT 1045 PM MDT RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES
NORTHWEST OF FORT MORGAN...MOVING TOWARD THE NORTHEAST AT 25 MPH.
THIS STORM PRODUCED 1 1/2 INCH DIAMETER HAIL AT WIGGINS AROUND
1030PM.
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 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 IN DENVER..OR CALL
YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN DENVER AT 361-0663.
DO NOT CALL THIS NUMBER FOR INFORMATION.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, Apr 24, 7:59 PM MDT, 2 hours 48 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 750 PM MDT MON APR 24 1989 ...THUNDERSTORMS ALONG NORTHERN FOOTHILLS... THUNDERSTORMS HAVE DEVELOPED ALONG THE NORTHERN FOOTHILLS OF LARIMER AND BOULDER COUNTIES. A BRIEF PERIOD OF HEAVY RAIN..SMALL HAIL AND GUSTY WINDS IS LIKELY TO ACCOMPANY THESE THUNDERSTORMS. 1/2 INCH TO 3/4 INCH SOFT HAIL HAS BEEN REPORTED WITH THESE THUNDERSTORMS NEAR THE TOWNS OF LONGMONT...BOULDER AND WEST OF FORT COLLINS. A FUNNEL CLOUD WAS REPORTED NEAR LOVELAND BUT DID NOT TOUCH DOWN. THE THUNDERSTORMS WILL AFFECT THE COMMUNITIES OF FORT COLLINS ...LOVELAND...LONGMONT AND BOULDER TIL ABOUT 830 PM MDT. IN ADDITION DANGEROUS LIGHTNING IS LIKELY WITH STORMS. IF YOU LIVE IN EASTERN LARIMER OR BOULDER COUNTIES OR WESTERN WELD COUNTY BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS. KNEAS
Special weather statement, Apr 24, 8:37 PM MDT, 2 hours 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 835 PM MDT MDT MON APR 24 1989 ...THUNDERSTORMS CONTINUE IN NORTHERN COLORADO... THUNDERSTORMS ARE MOVING AWAY FROM THE NORTHERN FOOTHILLS AND ONTO THE ADJACENT PLAINS IN NORTHERN COLORADO. THESE STORMS ARE MOVING NORTHEAST AT 20 MPH INTO WESTERN WELD COUNTY. THE COMMUNITIES OF NUNN...WINDSOR...AULT...GREELEY...FORT LUPTON...AND HUDSON WILL BE AFFECTED BY THESE THUNDERSTORMS UNTIL 930 MDT. THESE STORMS HAVE PRODUCED 1/2 INCH TO 3/4 INCH SOFT HAIL. GOLFBALL SIZE HAIL WAS REPORTED NEAR LAFAYETTE ABOUT 825 MDT. THESE STORMS ARE ALSO PRODUCING FREQUENT DANGEROUS LIGHTNING...IF THESE STORMS MOVE INTO YOUR ARE A SEEK A SAFE SHELTER. KNEAS
Local storm report, Apr 24, 9:16 PM MDT, 1 hour 31 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
915 PM MDT MON APR 24 1989
1950 MDT...3/4 INCH SOFT HAIL IN THE TABLE MESA AREA OF BOULDER...
BOULDER CY.
2008 MDT...3/4 INCH SOFT HAIL IN LOLUISVILLE...BOULDER CY.
2025 MDT...3/4 INCH TO GOLFBALL SIZE HAIL NEAR LAFAYETTE...BOULDER CY.
MARKKANENLocal storm report, Apr 24, 9:21 PM MDT, 1 hour 26 minutes before
STORM REPORT...AMENDED
NATIONAL WEATHER SERVICE DENVER CO
920 PM MDT MON APR 24 1989
1950 MDT...3/4 INCH SOFT HAIL IN THE TABLE MESA AREA OF BOULDER...
BOULDER CY.
2008 MDT...3/4 INCH SOFT PHAIL IN LOUISVILLE...BOULDER CY.
2025 MDT...3/4 INCH TO GOLFBALL SIZE HAIL NEAR LAFAYETTE...BOULDER CY.
2110 MDT...GOLFBALL SIZE HAIL NEAR DACONO...S.W. WELD CY.
MARKKANENSpecial weather statement, Apr 24, 9:28 PM MDT, 1 hour 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 930 PM MDT MDT MON APR 24 1989 ...THUNDERSTORMS CONTINUE IN WELD COUNTY... THUNDERSTORMS ARE PERSISTING STUBBORNLY IN WESTERN WELD COUNTY. AT 930 PM MDT THE HEAVIEST STORMS WERE JUST NORTH OF HUDSON AND NEAR GREELEY...MOVING TOWARD THE NORTHEAST AT ABOUT 20 MPH. THE COMMUNITIES OF ROGGEN AND BRIGGSDALE MAY BE AFFECTED BY THESE THUNDERSTORMS UNTIL 1030 MDT. EARLIER TONIGHT THUNDERSTORMS PRODUCED GOLFBALL SIZE HAIL NEAR LAFAYETTE IN BOULDER COUNTY...AND NEAR DACONO IN WELD COUNTY...ALONG WITH UP TO A QUARTER INCH OF RAIN. MORE RAIN...HAIL...AND DANGEROUS LIGHTNING ARE POSSIBLE IN WELD COUNTY THIS EVENING. MARKKANENT
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 9:49 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 56 min |
| Apr 25, 2:37 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 58 min |
| Apr 25, 3:29 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 61 min |
| Apr 25, 4:10 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Weld | 60 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1989Every severe thunderstorm warning in 1989
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.