Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 99, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 5, 1997, 2:30 PM MDT for Larimer County, Weld 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
- Jul 5, 1997, 2:30 PM MDT (20:30 UTC)
- Expired
- Jul 5, 1997, 3:00 PM MDT
- In force
- 30 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Larimer County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 73 km from the middle of the area, began a volume at 20:32 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, 8.5 hours before the alert went out and 153 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
- 2959 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 052029 RRA
SVRDEN
COC069-123-052100-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
230 PM MDT SAT JUL 5 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 300 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
WEST CENTRAL WELD
IN NORTH CENTRAL COLORADO
SOUTHEASTERN LARIMER
INCLUDING THE FOLLOWING LOCATIONS
JOHNSTOWN...MILLIKEN AND WINDSOR
AT 228 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 5 MILES WEST OF WINDSOR...OR ABOUT 10 MILES
SOUTHEAST OF FORT COLLINS.
THE STORM WAS MOVING SOUTH AT 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.
>REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.
SZOKE
LAT...LON 4029 10478 4029 10501 4048 10505 4055 10490What 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, Jul 5, 11:44 AM MDT, 2 hours 46 minutes before
COZ030-032>050-0600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO 1144 AM MDT SAT JUL 5 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: A NEW SLIGHTLY COOLER AIRMASS HAS MOVED INTO THE FORECAST AREA...WITH THE FRONT CURRENTLY MOVING VERY LITTLE OVER THE SOUTHERN PORTIONS OF THE FORECAST AREA. WITH A SLIGHT INCREASE IN LOW LEVEL MOISTURE...SOME COOLING ALOFT...AND A WEAK UPPER LEVEL DISTURBANCE ...ENOUGH INSTABILITY WILL BE PRESENT FOR THUNDERSTORM DEVELOPMENT LATER THIS AFTERNOON. WIDELY SCATTERED STORMS WILL DEVELOP OVER THE FOOTHILLS AND PALMER RIDGE BY EARLY AFTERNOON...THEN OVER THE REST OF THE PLAINS BY LATE AFTERNOON. SMALL HAIL AND WIND GUSTS TO 45 MPH CAN BE EXPECTED WITH THE STORMS. WITH THE A NEARLY STALLED FRONT AND A MOISTURE AXIS FORECAST OVER THE AREA THE STRONGEST STORMS CAN BE EXPECTED OVER ELBERT...WASHINGTON...AND LINCOLN COUNTIES AFTER 2:30 PM. SPOTTER ACTIVATION IS NOT ANTICIPATED EARLY THIS AFTERNOON BUT MAY BE NEEDED AFTER 4 PM. RJK
Special weather statement, Jul 5, 11:46 AM MDT, 2 hours 44 minutes before
COZ030-032>050-0600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO ...CORRECTED TEXT... 1146 AM MDT SAT JUL 5 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: A NEW SLIGHTLY COOLER AIRMASS HAS MOVED INTO THE FORECAST AREA...WITH THE FRONT CURRENTLY MOVING VERY LITTLE OVER THE SOUTHERN PORTIONS OF THE FORECAST AREA. WITH A SLIGHT INCREASE IN LOW LEVEL MOISTURE...SOME COOLING ALOFT...AND A WEAK UPPER LEVEL DISTURBANCE ...ENOUGH INSTABILITY WILL BE PRESENT FOR THUNDERSTORM DEVELOPMENT LATER THIS AFTERNOON. WIDELY SCATTERED STORMS WILL DEVELOP OVER THE FOOTHILLS AND PALMER RIDGE BY EARLY AFTERNOON...THEN OVER THE REST OF THE PLAINS BY LATE AFTERNOON. SMALL HAIL AND WIND GUSTS TO 45 MPH CAN BE EXPECTED WITH THE STORMS. WITH THE A NEARLY STALLED FRONT AND A MOISTURE AXIS FORECAST OVER THE AREA THE STRONGEST STORMS CAN BE EXPECTED OVER ELBERT...WASHINGTON...AND LINCOLN COUNTIES AFTER 2:30 PM. SPOTTER ACTIVATION IS NOT ANTICIPATED EARLY THIS AFTERNOON BUT MAY BE NEEDED AFTER 2:30 PM. RJK
Special weather statement, Jul 5, 1:10 PM MDT, 1 hour 20 minutes before
COZ035-038-051945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 110 PM MDT SAT JUL 5 1997 ...STRONG THUNDERSTORM IN NORTHEASTERN LARIMER COUNTY... AT 110 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES EAST OF VIRGINIA DALE...OR ABOUT 27 MILES NORTH OF FORT COLLINS. A NATIONAL WEATHER SERVICE COOPERATIVE OBSERVER 7 MILES NORTHEAST OF VIRGINIA DALE REPORTED HALF-INCH HAIL WITH THIS STORM. STRONG WINDS ARE ALSO POSSIBLE WITH THIS STORM. THE STORM WAS MOVING EAST AT 15 MILES PER HOUR. PERSONS IN OR NEAR CARR...LIVERMORE...MISHOWAKA...NATURAL FORT REST AREA...POUDRE PARK...TEDS PLACE...VIRGINIA DALE AND WELLINGTON SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. 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. SZOKE
Special weather statement, Jul 5, 1:15 PM MDT, 1 hour 15 minutes before
COZ035-038-051945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 110 PM MDT SAT JUL 5 1997 ...STRONG THUNDERSTORM IN NORTHEASTERN LARIMER COUNTY... AT 110 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES EAST OF VIRGINIA DALE...OR ABOUT 27 MILES NORTH OF FORT COLLINS. A NATIONAL WEATHER SERVICE COOPERATIVE OBSERVER 7 MILES NORTHEAST OF VIRGINIA DALE REPORTED HALF-INCH HAIL WITH THIS STORM. STRONG WINDS ARE ALSO POSSIBLE WITH THIS STORM. THE STORM WAS MOVING EAST AT 15 MILES PER HOUR. PERSONS IN OR NEAR CARR...LIVERMORE...MISHOWAKA...NATURAL FORT REST AREA...POUDRE PARK...TEDS PLACE...VIRGINIA DALE AND WELLINGTON SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. 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. SZOKE
Special weather statement, Jul 5, 2:00 PM MDT, 30 minutes before
COZ033>035-038-039-043-052030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 200 PM MDT SAT JUL 5 1997 ...STRONG THUNDERSTORMS MOVING OUT OF THE NORTHERN FOOTHILLS... AT 200 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SEVERAL STRONG THUNDERSTORM IN LARIMER COUNTY. THE STRONGEST STORM WAS NORTHEAST OF VIRGINIA DALE NEAR THE WYOMING BORDER AND EXTENDING INTO EXTREME NORTHWESTERN WELD COUNTY. THIS STORM PRODUCED THREE-QUARTER INCH HAIL AT 120 PM 9 MILES EAST-NORTHEAST OF VIRGINIA DALE. ANOTHER STRONG STORM WAS LOCATED WEST OF POUDRE PARK MOVING SOUTHEAST AROUND 15 MPH. OTHER STRONG STORMS WERE MOVING INTO THE EASTERN PORTION OF LARIMER COUNTY PRODUCING SMALL HAIL AND GUSTY WINDS. AT 200 PM HALF-INCH HAIL WAS REPORTED IN FORT COLLINS. SOMEWHAT WEAKER STORMS WILL ALSO CONTINUE MOVING INTO BOULDER COUNTY WITH STRONG WINDS THE MAIN THREAT AT THIS TIME. PERSONS IN LARIMER...BOULDER...AND WESTERN WELD COUNTIES SHOULD REMAIN ALERT FOR THUNDERSTORMS PRODUCING HAIL AND POSSIBLE GUSTY WINDS AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. SZOKE
Special weather statement, Jul 5, 2:04 PM MDT, 26 minutes before
COZ033>035-038-039-043-052030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 200 PM MDT SAT JUL 5 1997 ...STRONG THUNDERSTORMS MOVING OUT OF THE NORTHERN FOOTHILLS... AT 200 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SEVERAL STRONG THUNDERSTORM IN LARIMER COUNTY. THE STRONGEST STORM WAS NORTHEAST OF VIRGINIA DALE NEAR THE WYOMING BORDER AND EXTENDING INTO EXTREME NORTHWESTERN WELD COUNTY. THIS STORM PRODUCED THREE-QUARTER INCH HAIL AT 120 PM 9 MILES EAST-NORTHEAST OF VIRGINIA DALE. ANOTHER STRONG STORM WAS LOCATED WEST OF POUDRE PARK MOVING SOUTHEAST AROUND 15 MPH. OTHER STRONG STORMS WERE MOVING INTO THE EASTERN PORTION OF LARIMER COUNTY PRODUCING SMALL HAIL AND GUSTY WINDS. AT 200 PM HALF-INCH HAIL WAS REPORTED IN FORT COLLINS. SOMEWHAT WEAKER STORMS WILL ALSO CONTINUE MOVING INTO BOULDER COUNTY WITH STRONG WINDS THE MAIN THREAT AT THIS TIME. PERSONS IN LARIMER...BOULDER...AND WESTERN WELD COUNTIES SHOULD REMAIN ALERT FOR THUNDERSTORMS PRODUCING HAIL AND POSSIBLE GUSTY WINDS AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. SZOKE
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.