Alert archive / Colorado / Tornado Warnings in 1998
Tornado Warning 26, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jul 25, 1998, 2:44 PM MDT for Larimer County, Weld County, Colorado. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Jul 25, 1998, 2:44 PM MDT (20:44 UTC)
- Expired
- Jul 25, 1998, 3:10 PM MDT
- In force
- 26 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Larimer County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 27 km from the middle of the area, began a volume at 20:46 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 8.7 hours before the alert went out and 186 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
- 114 J/kg
- Mixed-layer CIN
- -131 J/kg
- Mixed-layer LCL
- 1134 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -29 m²/s²
- 0-3 km storm-relative helicity
- -47 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 252044 RRA
TORDEN
COC069-123-252115-
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
244 PM MDT SAT JUL 25 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* TORNADO WARNING FOR...
NORTHEASTERN LARIMER COUNTY IN NORTH CENTRAL COLORADO
NORTHWESTERN WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 310 PM MDT
* AT 237 PM MDT...THE PUBLIC REPORTED A TORNADO 2 MILES SOUTH OF THE
WYOMING BORDER ALONG I-25. THE STORM WAS MOVING SOUTHEAST AT 15
MILES PER HOUR. SPOTTERS ALSO REPORTED HALF INCH HAIL WITH THIS
STORM.
LOCATIONS IN THE WARNING INCLUDE...CARR...ROCKPORT AND NATURAL FORT
REST AREA
THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.
IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
LAT...LON 4099 10516 4078 10481 4089 10467 4099 10483
DANKERSWhat forecasters said that day
The local office's own words before this tornado 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 25, 11:38 AM MDT, 3 hours 6 minutes before
COZ030-032>050-260600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO 1140 AM MDT TUE JUL 7 1998 THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS: VERY LITTLE HAS CHANGED IN 24 HOURS. A VERY MOIST AIRMASS RESIDES OVER EASTERN COLORADO WITH A VERY WEAK WIND PATTERN THROUGH THE ATMOSPHERE. THE RESULT WILL BE ANOTHER ROUND OF WIDESPREAD SLOW MOVING THUNDERSTORMS THIS AFTERNOON AND EVENING. THE MOST LIKELY FOCUS FOR THESE STORMS WILL BE A WIND CONVERGENCE BOUNDARY...WHICH WILL EXTEND FROM NORTHEAST WELD COUNTY TO EASTERN ELBERT COUNTY EARLY THIS AFTERNOON...AND SLIGHTLY FURTHER WEST BY EARLY EVENING. AS WE HAVE SEEN IN THE PAST FEW DAYS...OUTFLOW BOUNDARIES FROM THE STORMS WILL BE CRITICAL IN HOW STORMS DEVELOP AND MOVE THROUGH THE AFTERNOON AND EVENING. TORRENTIAL RAINFALL RATES ARE AGAIN POSSIBLE...IN THE HEART OF SOME STORMS RAINFALL RATES OF 2.5 INCHES AN HOUR ARE POSSIBLE...WITH 3 TO 4 INCHES POSSIBLE IN AN HOUR. WE WILL MOST LIKELY ISSUE ANOTHER FLASH FLOOD WATCH LATER THIS AFTERNOON...AS WE BETTER DEFINE THE AREA TO BE IMPACTED BY THE HEAVY RAIN. WE DO NOT EXPECT TO ACTIVATE SPOTTER NETWORKS...BUT ASK SPOTTERS TO REPORT ANY FLOODING PROBLEMS...AND IF RAIN GAUGES ARE AVAILABLE...ANY RAINFALL AMOUNTS IN EXCESS OF 1 INCH. RTG
Special weather statement, Jul 25, 11:40 AM MDT, 3 hours 4 minutes before
COZ030-032>050-260600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO 1140 AM MDT SAT JUL 25 1998 ...CORRECTED DATE... THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS: VERY LITTLE HAS CHANGED IN 24 HOURS. A VERY MOIST AIRMASS RESIDES OVER EASTERN COLORADO WITH A VERY WEAK WIND PATTERN THROUGH THE ATMOSPHERE. THE RESULT WILL BE ANOTHER ROUND OF WIDESPREAD SLOW MOVING THUNDERSTORMS THIS AFTERNOON AND EVENING. THE MOST LIKELY FOCUS FOR THESE STORMS WILL BE A WIND CONVERGENCE BOUNDARY...WHICH WILL EXTEND FROM NORTHEAST WELD COUNTY TO EASTERN ELBERT COUNTY EARLY THIS AFTERNOON...AND SLIGHTLY FURTHER WEST BY EARLY EVENING. AS WE HAVE SEEN IN THE PAST FEW DAYS...OUTFLOW BOUNDARIES FROM THE STORMS WILL BE CRITICAL IN HOW STORMS DEVELOP AND MOVE THROUGH THE AFTERNOON AND EVENING. TORRENTIAL RAINFALL RATES ARE AGAIN POSSIBLE...IN THE HEART OF SOME STORMS RAINFALL RATES OF 2.5 INCHES AN HOUR ARE POSSIBLE...WITH 3 TO 4 INCHES POSSIBLE IN AN HOUR. WE WILL MOST LIKELY ISSUE ANOTHER FLASH FLOOD WATCH LATER THIS AFTERNOON...AS WE BETTER DEFINE THE AREA TO BE IMPACTED BY THE HEAVY RAIN. WE DO NOT EXPECT TO ACTIVATE SPOTTER NETWORKS...BUT ASK SPOTTERS TO REPORT ANY FLOODING PROBLEMS...AND IF RAIN GAUGES ARE AVAILABLE...ANY RAINFALL AMOUNTS IN EXCESS OF 1 INCH. RTG
Special weather statement, Jul 25, 11:40 AM MDT, 3 hours 4 minutes before
COZ030-032>050-260600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO 1140 AM MDT SAT JUL 25 1998 ...CORRECTED DATE... THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS: VERY LITTLE HAS CHANGED IN 24 HOURS. A VERY MOIST AIRMASS RESIDES OVER EASTERN COLORADO WITH A VERY WEAK WIND PATTERN THROUGH THE ATMOSPHERE. THE RESULT WILL BE ANOTHER ROUND OF WIDESPREAD SLOW MOVING THUNDERSTORMS THIS AFTERNOON AND EVENING. THE MOST LIKELY FOCUS FOR THESE STORMS WILL BE A WIND CONVERGENCE BOUNDARY...WHICH WILL EXTEND FROM NORTHEAST WELD COUNTY TO EASTERN ELBERT COUNTY EARLY THIS AFTERNOON...AND SLIGHTLY FURTHER WEST BY EARLY EVENING. AS WE HAVE SEEN IN THE PAST FEW DAYS...OUTFLOW BOUNDARIES FROM THE STORMS WILL BE CRITICAL IN HOW STORMS DEVELOP AND MOVE THROUGH THE AFTERNOON AND EVENING. TORRENTIAL RAINFALL RATES ARE AGAIN POSSIBLE...IN THE HEART OF SOME STORMS RAINFALL RATES OF 2.5 INCHES AN HOUR ARE POSSIBLE...WITH 3 TO 4 INCHES POSSIBLE IN AN HOUR. WE WILL MOST LIKELY ISSUE ANOTHER FLASH FLOOD WATCH LATER THIS AFTERNOON...AS WE BETTER DEFINE THE AREA TO BE IMPACTED BY THE HEAVY RAIN. WE DO NOT EXPECT TO ACTIVATE SPOTTER NETWORKS...BUT ASK SPOTTERS TO REPORT ANY FLOODING PROBLEMS...AND IF RAIN GAUGES ARE AVAILABLE...ANY RAINFALL AMOUNTS IN EXCESS OF 1 INCH. RTG
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 8:28 PM MDT | Flash Flood Warning | BOU | Adams, Arapahoe | 3 hr |
| Jul 25, 4:15 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 30 min |
| Jul 25, 4:29 PM MDT | Flash Flood Warning | BOU | Logan | 3 hr |
| Jul 25, 4:50 PM MDT | Flash Flood Warning | BOU | Clear Creek | 115 min |
| Jul 25, 5:03 PM MDT | Tornado Warning | BOU | Adams, Denver | 27 min |
| Jul 25, 5:07 PM MDT | Flash Flood Warning | BOU | Morgan | 3 hr |
| Jul 25, 5:35 PM MDT | Flash Flood Warning | BOU | Washington | 2 hr |
| Jul 25, 5:41 PM MDT | Flash Flood Warning | BOU | Washington | 2 hr |
Nearby
Tornado Warnings in Colorado, 1998Every tornado warning in 1998Tornadoes in 1998
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; radar from the NEXRAD Level II archive.