Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 162, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 31, 1998, 4:08 PM MDT for Grand County, Jackson County, Colorado. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 31, 1998, 4:08 PM MDT (22:08 UTC)
- Expired
- Aug 31, 1998, 4:45 PM MDT
- In force
- 37 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Grand County, CO, Jackson County, CO
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 10.1 hours before the alert went out and 239 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
- 3580 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, Aug 31, 11:30 AM MDT, 4 hours 38 minutes before
COZ030-032>050-010600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1130 AM MDT MON AUG 31 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: A WEAK COLD FRONT MOVED THROUGH NORTHEAST COLORADO EARLY THIS MORNING...WHICH HAS STABILIZED THE ATMOSPHERE FOR THE TIME BEING ACROSS THE NORTHEAST PLAINS. BEHIND THE FRONT...UPSLOPE FLOW WITH NORTHEAST WINDS WILL CONTINUE TO DEVELOP THIS AFTERNOON AND CONTINUE TONIGHT. THUNDERSTORM INITIATION WILL BEGIN IN THE MOUNTAINS AND FOOTHILLS TOWARDS MID AFTERNOON. THUNDERSTORMS WILL INITIALLY HAVE A HARD TIME MOVING OUT ONTO THE FRONT RANGE...HOWEVER WITH OUTFLOW BOUNDARIES AND GREATER INSTABILITY LATER IN THE DAY...STORMS SHOULD BEGIN TO INCREASE IN COVERAGE OVER THE FRONT RANGE CITIES. HEAVY RAIN AND SMALL HAIL ARE LIKELY WITH THESE STORMS...HOWEVER WOULD NOT RULE OUT AN ISOLATED SEVERE STORM WITH LARGER HAIL UP TO 1 INCH IN DIAMETER IN THE FOOTHILLS AND NEARBY PLAINS TOWARDS EVENING. FURTHER EASTWARD ACROSS THE NORTHEAST PLAINS...ONLY ISOLATED SHOWERS ARE EXPECTED THROUGH THE EARLY EVENING HOURS. SPOTTER ACTIVATION IS NOT ANTICIPATED AS MOST OF THE STORMS WILL REMAIN BELOW SEVERE LIMITS. ENTREKIN
Special weather statement, Aug 31, 11:30 AM MDT, 4 hours 38 minutes before
COZ030-032>050-010600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1130 AM MDT MON AUG 31 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: A WEAK COLD FRONT MOVED THROUGH NORTHEAST COLORADO EARLY THIS MORNING...WHICH HAS STABILIZED THE ATMOSPHERE FOR THE TIME BEING ACROSS THE NORTHEAST PLAINS. BEHIND THE FRONT...UPSLOPE FLOW WITH NORTHEAST WINDS WILL CONTINUE TO DEVELOP THIS AFTERNOON AND CONTINUE TONIGHT. THUNDERSTORM INITIATION WILL BEGIN IN THE MOUNTAINS AND FOOTHILLS TOWARDS MID AFTERNOON. THUNDERSTORMS WILL INITIALLY HAVE A HARD TIME MOVING OUT ONTO THE FRONT RANGE...HOWEVER WITH OUTFLOW BOUNDARIES AND GREATER INSTABILITY LATER IN THE DAY...STORMS SHOULD BEGIN TO INCREASE IN COVERAGE OVER THE FRONT RANGE CITIES. HEAVY RAIN AND SMALL HAIL ARE LIKELY WITH THESE STORMS...HOWEVER WOULD NOT RULE OUT AN ISOLATED SEVERE STORM WITH LARGER HAIL UP TO 1 INCH IN DIAMETER IN THE FOOTHILLS AND NEARBY PLAINS TOWARDS EVENING. FURTHER EASTWARD ACROSS THE NORTHEAST PLAINS...ONLY ISOLATED SHOWERS ARE EXPECTED THROUGH THE EARLY EVENING HOURS. SPOTTER ACTIVATION IS NOT ANTICIPATED AS MOST OF THE STORMS WILL REMAIN BELOW SEVERE LIMITS. ENTREKIN
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 4:03 PM MDT | Severe Thunderstorm Warning | BOU | Grand, Jackson | 42 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1998Every severe thunderstorm warning 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.