Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 21, 1998, 1:50 PM MDT for Logan County, Colorado. It was in force for 55 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
- May 21, 1998, 1:50 PM MDT (19:50 UTC)
- Expired
- May 21, 1998, 2:45 PM MDT
- In force
- 55 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Logan County, CO
The radar
The Cheyenne radar (KCYS), 135 km from the middle of the area, began a volume at 19:50 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, 7.8 hours before the alert went out and 121 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
- 2454 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
183
WUUS1 KDEN 211951 RRA
SVRDEN
COC075-212045-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
150 PM MDT THU MAY 21 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTH CENTRAL LOGAN COUNTY IN NORTHEAST COLORADO
* UNTIL 245 PM MDT
* AT 147 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 13 MILES WEST OF PEETZ...OR ABOUT 23 MILES
NORTH OF STERLING...MOVING EAST AT 20 MILES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE...PEETZ
IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS OVER 60
MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
LAT...LON 4099 10343 4091 10339 4092 10291 4099 10295
LESZCYNSKIThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 6:22 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 38 min |
| May 20, 6:36 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 24 min |
| May 20, 7:01 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 39 min |
| May 21, 2:19 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 36 min |
| May 21, 3:18 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 42 min |
| May 21, 3:57 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 48 min |
| May 21, 4:22 PM MDT | Tornado Warning | BOU | Weld | 28 min |
| May 21, 4:51 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Weld | 39 min |
| May 21, 5:35 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 35 min |
| May 21, 5:41 PM MDT | Tornado Warning | BOU | Phillips, Sedgwick | 39 min |
| May 21, 5:47 PM MDT | Tornado Warning | BOU | Phillips, Sedgwick | 33 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; radar from the NEXRAD Level II archive.