Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 72, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 22, 1997, 7:15 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 45 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 22, 1997, 7:15 PM MDT (01:15 UTC)
- Expired
- Jun 22, 1997, 8:00 PM MDT
- In force
- 45 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Adams County, CO, Arapahoe County, CO
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.3 hours before the alert went out and 318 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
- 268 J/kg
- Mixed-layer CIN
- -178 J/kg
- Mixed-layer LCL
- 2644 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
732
WUUS1 KDEN 230116 RRA
SVRDEN
COC001-005-230200-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
715 PM MDT SUN JUN 22 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 800 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
NORTH CENTRAL ARAPAHOE AND EASTERN ADAMS
INCLUDING THE FOLLOWING LOCATIONS
LEADER
AT 710 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 4 MILES SOUTHEAST OF LEADER...OR ABOUT 30 MILES
SOUTHWEST OF FORT MORGAN.
THE STORM WAS MOVING NORTHEAST AT 10 TO 15 MILES PER HOUR.
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.
INTENSE LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY
AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.
REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.
GARD...WSFO DENVER
LAT...LON 3999 10372 3970 10411 3976 10434 3998 10401What 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 22, 3:35 PM MDT, 3 hours 40 minutes before
COZ039-040-041-043-045-230000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 335 PM MDT SUN JUN 22 1997 ...STRONG GUSTY WINDS ACROSS METRO DENVER... BRIEF VERY STRONG AND GUSTY MICROBURST WINDS ARE POSSIBLE ACROSS METRO DENVER DURING THE REMAINDER OF THE AFTERNOON AND EARLY EVENING HOURS. AT 255 PM MDT WINDS BRIEFLY GUSTED TO 69 MPH AT JEFFERSON COUNTY AIRPORT NEAR BROOMFIELD. THE STRONG WINDS ARE THE RESULT OF COOLER AIR ALOFT BEING DRAWN TO THE SURFACE BY FALLING LIGHT RAIN OR VIRGA...RAIN EVAPORATING BEFORE REACHING THE GROUND. THIS COOLER AIR UNDER A CONVECTIVE CLOUD SLAMS TO THE GROUND...SPREADS OUT IN ALL DIRECTIONS AND PRODUCES BRIEF VERY STRONG AND GUSTY WINDS CALLED MICROBURSTS. THE VERY STRONG WINDS WILL LAST FOR ONLY A MINUTE OR TWO BEFORE DISSIPATING. GARD...WSFO DENVER
Special weather statement, Jun 22, 3:36 PM MDT, 3 hours 39 minutes before
COZ039-040-041-043-045-230000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 335 PM MDT SUN JUN 22 1997 ...STRONG GUSTY WINDS ACROSS METRO DENVER... BRIEF VERY STRONG AND GUSTY MICROBURST WINDS ARE POSSIBLE ACROSS METRO DENVER DURING THE REMAINDER OF THE AFTERNOON AND EARLY EVENING HOURS. AT 255 PM MDT WINDS BRIEFLY GUSTED TO 69 MPH AT JEFFERSON COUNTY AIRPORT NEAR BROOMFIELD. THE STRONG WINDS ARE THE RESULT OF COOLER AIR ALOFT BEING DRAWN TO THE SURFACE BY FALLING LIGHT RAIN OR VIRGA...RAIN EVAPORATING BEFORE REACHING THE GROUND. THIS COOLER AIR UNDER A CONVECTIVE CLOUD SLAMS TO THE GROUND...SPREADS OUT IN ALL DIRECTIONS AND PRODUCES BRIEF VERY STRONG AND GUSTDY WINDS CALLED MICROBURSTS. THE VERY STRONG WINDS WILL LAST FOR ONLY A MINUTE OR TWO BEFORE DISSIPATING. GARD...WSFO DENVER
Special weather statement, Jun 22, 5:50 PM MDT, 1 hour 25 minutes before
COZ043>045-230100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 550 PM MDT SUN JUN 22 1997 ...STRONG THUNDERSTORMS WILL LIKELY DEVELOP EAST OF DENVER... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS WILL LIKELY DEVELOP DURING THE NEXT HOUR IN CENTRAL ARAPAHOE...EASTERN ADAMS...SOUTH CENTRAL WELD AND SOUTHWESTERN MORGAN COUNTIES OF COLORADO. ALL PERSONS IN OR NEAR ADENA...BYERS...COUNTRY GARDENS...DEER TRAIL...HOYT...LEADER AND STRASBURG SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. DANGEROUS LIGHTNING...SMALL HAIL...BRIEF HEAVY RAIN...AND GUSTY WINDS WILL OCCUR WITH THESE STORMS UNTIL 700 PM MDT THIS EVENING. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES...UNLESS IN AN EMERGENCY...UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS. GARD...WSFO DENVER
Special weather statement, Jun 22, 5:51 PM MDT, 1 hour 24 minutes before
COZ043>045-230100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 550 PM MDT SUN JUN 22 1997 ...STRONG THUNDERSTORMS WILL LIKELY DEVELOP EAST OF DENVER... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS WILL LIKELY DEVELOP DURING THE NEXT HOUR IN CENTRAL ARAPAHOE...EASTERN ADAMS...SOUTH CENTRAL WELD AND SOUTHWESTERN MORGAN COUNTIES OF COLORADO. ALL PERSONS IN OR NEAR ADENA...BYERS...COUNTRY GARDENS...DEER TRAIL...HOYT...LEADER AND STRASBURG SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. DANGEROUS LIGHTNING...SMALL HAIL...BRIEF HEAVY RAIN...AND GUSTY WINDS WILL OCCUR WITH THESE STORMS UNTIL 700 PM MDT THIS EVENING. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES...UNLESS IN AN EMERGENCY...UNTIL THE STORM HAtS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS. GARD...WSFO DENVER
Special weather statement, Jun 22, 6:40 PM MDT, 35 minutes before
COZ044-045-230130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 640 PM MDT SUN JUN 22 1997 ...STRONG THUNDERSTORMS FORMING IN EASTERN ADAMS AND MORGAN COUNTIES... AT 635 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS DEVELOPING IN EASTERN ADAMS AND MORGAN COUNTIES. THE STRONGEST STORM WAS 3 MILES NORTHEAST OF ADENA...OR ABOUT 14 MILES SOUTH OF FORT MORGAN. THE STORMS WERE MOVING NORTHEAST AT 20 MILES PER HOUR. PERSONS IN OR NEAR ADENA SCHOOL...ADENA...BRUSH...FORT MORGAN... HOYT...LEADER...LOG LANE VILLAGE...SHAMROCK AND TWELVE-MILE CORNER SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. DANGEROUS LIGHTNING...SMALL HAIL...BRIEF HEAVY RAIN...AND GUSTY WINDS WILL OCCUR WITH THESE STORMS UNTIL 730 PM MDT THIS EVENING. WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES...UNLESS IN AN EMERGENCY...UNTIL THE STORM HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS. INTENSE LIGHTNING IS REPORTED WITH THESE STORMS. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES. GARD...WSFO DENVER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 5:28 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver, Jefferson | 47 min |
| Jun 23, 5:28 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 47 min |
| Jun 23, 5:28 PM MDT | Severe Thunderstorm Warning | BOU | Boulder | 47 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.