Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 83, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 24, 1997, 5:15 PM MDT for Morgan County, Colorado. It was in force for 30 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
- Jun 24, 1997, 5:15 PM MDT (23:15 UTC)
- Expired
- Jun 24, 1997, 5:45 PM MDT
- In force
- 30 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Morgan County, CO
The radar
The Denver radar (KFTG), 102 km from the middle of the area, began a volume at 23:16 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, 11.3 hours before the alert went out and 61 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
- 210 J/kg
- Mixed-layer CIN
- -271 J/kg
- Mixed-layer LCL
- 2200 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- -34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
377
WUUS1 KDEN 242317 RRA
SVRDEN
COC087-242345-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
515 PM MDT TUE JUN 24 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 545 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
EAST CENTRAL MORGAN
INCLUDING THE FOLLOWING LOCATIONS
HILLROSE AND SNYDER
AT 510 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 5 MILES WEST OF SNYDER...OR ABOUT 9 MILES
NORTHEAST OF FORT MORGAN.
THE STORM WAS MOVING EAST AT 15 MILES PER HOUR.
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH
LITTLE OR NO ADVANCE WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN
A STURDY STRUCTURE SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A
TORNADO IS SPOTTED.
VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.
THIS WARNING REPLACES THE EARLIER WARNING THAT COVERED NORTHEAST
MORGAN AND EAST CENTRAL WELD COUNTIES.
REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.
LAT...LON 4038 10351 4027 10348 4026 10364 4034 10376
4044 10369
ETWhat 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, Jun 24, 11:15 AM MDT, 6 hours before
COZ030-032>050-260600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT TUE JUN 24 1997 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: IT WILL BE A VERY ACTIVE AFTERNOON AND EVENING FOR CONVECTION OVER NORTHEAST COLORADO. SEVERAL FACTORS WILL COME TOGETHER TO PRODUCE WIDESPREAD...POSSIBLY SEVERE THUNDERSTORMS WITH HEAVY RAIN...ESPECIALLY EAST OF GREELEY TO LIMON LINE THIS EVENING. SOUTHEAST WINDS WILL CONTINUE TO FEED MOIST AIR ACROSS NORTHEAST COLORADO INTO SOUTHEAST WYOMING. A WEAK UPPER TROUGH WILL ALSO HELP FOCUS THE THUNDERSTORMS IN NORTHEAST COLORADO LATE THIS AFTERNOON AND EVENING. A SURFACE LOW WILL STRENGTHEN EAST OR NORTHEAST OF DENVER WHICH WILL ALSO ACT AS A FOCUS FOR THUNDERSTORMS. WINDS WILL TURN CLOCKWISE WITH HEIGHT...SO THUNDERSTORMS WILL ALSO BE CAPABLE OF PRODUCING TORNADOES. THUNDERSTORMS WILL RAPIDLY FORM OVER THE HIGHER TERRAIN...THE FOOTHILLS...PALMER DIVIDE AND CHEYENNE RIDGE EARLY THIS AFTERNOON... AND DEVELOP TO THE PLAINS BEFORE 2PM. BY EVENING... THUNDERSTORMS SHOULD BEGIN DECREASING OVER THE URBAN CORRIDOR...WHILE THUNDERSTORMS BECOME WIDESPREAD TO THE NORTHEAST OF GREELEY AND LIMON. WE WILL HAVE TO WATCH FOR...TORNADOES...LARGE HAIL...AND POSSIBLE FLOODING. SPOTTERS WILL LIKELY BE ACTIVATED AROUND 1PM. RTG
Special weather statement, Jun 24, 11:45 AM MDT, 5 hours 30 minutes before
COZ030-032>050-270600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO 1145 AM MDT TUE JUN 24 1997 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: THE SURFACE AIRMASS HAS SLIGHTLY DRIED TODAY FROM YESTERDAY AND THERE HAS BEEN SOME SLIGHT WARMING ALOFT. IN SPITE OF THESE TWO FACTORS THERE IS STILL ENOUGH MOISTURE PRESENT FOR THUNDERSTORM DEVELOPMENT WHEN COUPLED WITH THE EXPECTED SIGNIFICANT DAYTIME HEATING. SOUTHEAST SURFACE FLOW SHOULD CONTINUE TO DEVELOP AND INCREASE OVER THE PLAINS THIS AFTERNOON CREATING A CONVERGENCE LINE FOR THUNDERSTORMS TO DEVELOP UPON TO THE EAST OF THE DENVER METRO AREA. EXPECT STORMS TO DEVELOP OVER THE HIGHER TERRAIN BY 1:30 PM...AND OUT OVER THE PLAINS BY 4 PM. SOME OF THE STORMS MAY BE SEVERE OVER MOST OF THE PLAINS...DUE TO LARGE HAIL AND STRONG WINDS. THE BEST THREAT OF SEVERE WEATHER WILL BE OVER LINCOLN... WASHINGTON...LOGAN....PHILLIPS...AND SEDGWICK COUNTIES. SPOTTER ACTIVATION MAY BE NEEDED AFTER 3 PM. RJK
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 6:59 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 31 min |
| Jun 23, 8:14 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 46 min |
| Jun 23, 9:00 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
| Jun 24, 3:11 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 49 min |
| Jun 24, 3:58 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 47 min |
| Jun 24, 4:40 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 50 min |
| Jun 24, 4:43 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 32 min |
| Jun 24, 5:11 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 49 min |
| Jun 24, 5:26 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 49 min |
| Jun 24, 5:36 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 39 min |
| Jun 24, 5:50 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 40 min |
| Jun 24, 5:54 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 36 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1997Every severe thunderstorm warning in 1997
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.