Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 103, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 19, 1997, 1:35 PM MDT for 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 19, 1997, 1:35 PM MDT (19:35 UTC)
- Expired
- Jul 19, 1997, 2:05 PM MDT
- In force
- 30 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Weld County, CO
The radar
The Denver radar (KFTG), 71 km from the middle of the area, began a volume at 19:35 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, 7.6 hours before the alert went out and 117 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
- 31 J/kg
- Mixed-layer CIN
- -303 J/kg
- Mixed-layer LCL
- 1548 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- 33 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 191934 RRA
SVRDEN
COC123-192000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
135 PM MDT SAT JUL 19 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 205 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
CENTRAL WELD
INCLUDING THE FOLLOWING LOCATIONS
BARNESVILLE...GILL AND KERSEY
AT 135 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER GILL...OR ABOUT 11 MILES EAST OF GREELEY.
THE STORM WAS MOVING EAST AT 5 MILES PER HOUR.
LARGE HAIL AND VERY HEAVY RAINS ARE 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.
HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY
MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO
RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.
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 4042 10427 4027 10439 4039 10462 4059 10449
SZOKEWhat 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 19, 11:15 AM MDT, 2 hours 20 minutes before
COZ030-032>050-200600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT SAT JUL 19 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: MOISTURE HAS INCREASED ACROSS THE AREA AT ALL LEVELS. IN ADDITION A COUPLE OF UPPER LEVEL DISTURBANCES WILL ENHANCE THUNDERSTORM ACTIVITY ACROSS THE AREA. ONE IS MOVING NORTH ALONG THE FRONT RANGE...LOCATED WEST OF COLORADO SPRINGS THIS MORNING. ANOTHER IS APPROACHING FROM THE WEST. FINALLY...A LOW LEVEL BOUNDARY IS PRESENT FROM WEST OF LIMON NORTH ACROSS EASTERN ARAPAHOE AND ADAMS COUNTIES...SEPARATING NORTHWEST WINDS TO THE WEST FROM SOUTHEAST FLOW. THUNDERSTORMS ARE ALREADY FORMING NORTHWEST OF GREELEY AND WILL BECOME MORE WIDESPREAD THROUGH THE AFTERNOON. WINDS ALOFT ARE LIGHT...SO WELL-ORGANIZED STORMS ARE NOT ANTICIPATED. THE MAIN THREAT IS EXPECTED TO BE LOCALLY HEAVY RAINS. HAIL IS ALSO POSSIBLE WITH SOME OF THE STRONGER STORMS BUT SHOULD GENERALLY REMAIN BELOW SEVERE LEVELS. AT THIS TIME SPOTTER ACTIVATION IS NOT ANTICIPATED BUT RAINFALL REPORTS WOULD BE APPRECIATED. SZOKE
Special weather statement, Jul 19, 12:46 PM MDT, 49 minutes before
COZ038-191915- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1246 PM MDT SAT JUL 19 1997 ...THUNDERSTORM IN NORTHWESTERN WELD COUNTY... AT 1246 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 3 MILES SOUTHEAST OF CARR...OR ABOUT 23 MILES NORTHEAST OF FORT COLLINS. THIS STORM HAS A HISTORY OF PRODUCING PEA TO MARBLE SIZE HAIL. THE STORM WAS MOVING NORTH AT 15 MILES PER HOUR. PERSONS IN OR NEAR CARR...NATURAL FORT REST AREA AND ROCKPORT SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. HERRALD
Special weather statement, Jul 19, 12:49 PM MDT, 46 minutes before
COZ038-191915- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1246 PM MDT SAT JUL 19 1997 ...THUNDERSTORM IN NORTHWESTERN WELD COUNTY... AT 1246 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 3 MILES SOUTHEAST OF CARR...OR ABOUT 23 MILES NORTHEAST OF FORT COLLINS. THIS STORM HAS A HISTORY OF PRODUCING PEA TO MARBLE SIZE HAIL. THE STORM WAS MOVING NORTH AT 15 MILES PER HOUR. PERSONS IN OR NEAR CARR...NATURAL FORT REST AREA AND ROCKPORT SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CRO4SS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. HERRALD
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 1:06 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 24 min |
| Jul 19, 4:39 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 36 min |
| Jul 19, 5:15 PM MDT | Flash Flood Warning | BOU | Adams, Arapahoe, Denver | 90 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.