Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 90, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 25, 1997, 4:15 PM MDT for Sedgwick County, Colorado. It was in force for 45 min. 1 report came from 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, with what was reported inside it.
The facts
- Issued
- Jun 25, 1997, 4:15 PM MDT (22:15 UTC)
- Expired
- Jun 25, 1997, 5:00 PM MDT
- In force
- 45 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Sedgwick County, CO
The radar
The Goodland radar (KGLD), 174 km from the middle of the area, began a volume at 22:09 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 25, 4:22 PM MDT | Hail 1.75 | Julesburg, CO |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 25, 1:45 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.3 hours before the alert went out and 133 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
- 51 J/kg
- Mixed-layer CIN
- -154 J/kg
- Mixed-layer LCL
- 945 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- -48 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
048
WUUS1 KDEN 252216 RRA
SVRDEN
COC115-252300-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
415 PM MDT WED JUN 25 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 500 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
EASTERN SEDGWICK
INCLUDING THE FOLLOWING LOCATIONS
JULESBURG AND SIXTEEN-MILE CORNER
AT 409 PM MDT THE PUBLIC REPORTED 1 INCH DIAMETER HAIL 3 MILES
EAST OF JULESBURG.
THE STORM WAS MOVING SOUTHEAST AT 35 MILES PER HOUR.
A TORNADO WATCH REMAINS IN EFFECT FOR NORTHEAST COLORADO UNTIL
8 PM MDT. REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCED WARNING.
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 4099 10206 4076 10205 4076 10231 4099 10227
BARJENBRUCHWhat 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 25, 11:14 AM MDT, 5 hours 1 minute 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 25, 11:32 AM MDT, 4 hours 43 minutes before
COZ030-032>050-260600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT WED JUN 25 1997...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: 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 THUNDEZRSTORMS 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 25, 11:32 AM MDT, 4 hours 43 minutes before
COZ030-032>050-260600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT WED JUN 25 1997...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: 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 THUNDEZRSTORMS 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 25, 2:35 PM MDT, 1 hour 40 minutes before
COZ038-042-048-050-252100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 235 PM MDT WED JUN 25 1997 ...THUNDERSTORM IN NEBRASKA PANHANDLE... AT 235 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 28 MILES NORTH OF WESTPLAINS...OR ABOUT 48 MILES NORTHWEST OF STERLING IN THE NEBRASKA PANHANDLE. THE STORM WAS MOVING SOUTHEAST AT 10 MILES PER HOUR. THIS STORM HAS PRODUCED AT LEAST TWO TORNADOES IN THE NEBRASKA PANHANDLE AS WELL AS NICKEL TO DIME SIZED HAIL. OTHER STORMS ARE DEVELOPING OVER EXTREME SOUTHEAST WYOMING AND THE SOUTHWEST PART OF THE NEBRASKA PANHANDLE. IF THESE STORMS CONTINUE ON THEIR PRESENT TRACK...THEY WILL BE AFFECTING NORTHEASTERN LARIMER...NORTHERN WELD...NORTHERN LOGAN AND WESTERN SEDGWICK COUNTIES AFTER 3 PM. PERSONS IN OR NEAR CARR... CROOK...GROVER...HEREFORD...PAWNEE BUTTES...PEETZ...PROCTOR... ROCKPORT...TWIN BUTTES AND WESTPLAINS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. GET INSIDE A STURDY BUILDING ON THE LOWEST FLOOR AND STAY AWAY FROM WINDOWS. A TORNADO WATCH REMAINS IN EFFECT FOR MOST OF NORTHEASTERN COLORADO UNTIL 8 PM MDT.
Special weather statement, Jun 25, 2:37 PM MDT, 1 hour 38 minutes before
COZ038-042-048-050-252100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 235 PM MDT WED JUN 25 1997 ...THUNDERSTORM IN NEBRASKA PANHANDLE... AT 235 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 28 MILES NORTH OF WESTPLAINS...OR ABOUT 48 MILES NORTHWEST OF STERLING IN THE NEBRASKA PANHANDLE. THE STORM WAS MOVING SOUTHEAST AT 10 MILES PER HOUR. THIS STORM HAS PRODUCED AT LEAST TWO TORNADOES IN THE NEBRASKA PANHANDLE AS WELL AS NICKEL TO DIME SIZED HAIL. OTHER STORMS ARE DEVELOPING OVER EXTREME SOUTHEAST WYOMING AND THE SOUTHWEST PART OF THE NEBRASKA PANHANDLE. IF THESE STORMS CONTINUE ON THEIR PRESENT TRACK...THEY WILL BE AFFECTING NORTHEASTERN LARIMER...NORTHERN WELD...NORTHERN LOGAN AND WESTERN SEDGWICK COUNTIES AFTER 3 PM. PERSONS IN OR NEAR CARR... CROOK...GROVER...HEREFORD...PAWNEE BUTTES...PEETZ...PROCTOR... ROCKPORT...TWIN BUTTES AND WESTPLAINS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. GET INSIDE A STURDY BUILDING ON THE LOWEST FLOOR AND STAY AWAY FROM WINDOWS. A TORNADO WATCH REMAINS IN EFFECT FOR MOST OF NORTHEASTERN COLORADO UNTIL 8 PM MDT. ~
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 6:29 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 31 min |
| Jun 24, 7:01 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan, Washington | 29 min |
| Jun 25, 3:10 PM MDT | Tornado Warning | BOU | Logan, Weld | 35 min |
| Jun 25, 3:33 PM MDT | Tornado Warning | BOU | Logan | 27 min |
| Jun 25, 3:45 PM MDT | Tornado Warning | BOU | Logan, Weld | 30 min |
| Jun 25, 4:04 PM MDT | Tornado Warning | BOU | Logan | 26 min |
| Jun 25, 4:53 PM MDT | Flash Flood Warning | BOU | Logan | 2 hr |
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.