Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 104, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 19, 1997, 4:39 PM MDT for Adams County, Arapahoe County, Denver County, Colorado. It was in force for 36 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 19, 1997, 4:39 PM MDT (22:39 UTC)
- Expired
- Jul 19, 1997, 5:15 PM MDT
- In force
- 36 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Adams County, CO, Arapahoe County, CO, Denver County, CO
The radar
The Denver radar (KFTG), 4 km from the middle of the area, began a volume at 22:39 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 |
|---|---|---|---|
| Jul 19, 4:45 PM MDT | Hail 1.25 | Denver, 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 nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.7 hours before the alert went out and 111 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 192242
SVRDEN
COC001-005-031-192315-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
439 PM MDT SAT JUL 19 1997
CORRECTED LOCATION
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 515 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
NORTHWESTERN ARAPAHOE...EASTERN DENVER AND WESTERN ADAMS
INCLUDING THE FOLLOWING LOCATIONS
AURORA...DENVER INTERNATIONAL AIRPORT...AND NORTHEASTERN
DENVER
AT 439 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER WEST CENTRAL AURORA...OR ABOUT 7 MILES EAST
OF DENVER.
THIS STORM WAS PRODUCING HAIL AT LEAST 1 INCH IN DIAMETER.
THE STORM WAS STATIONARY.
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 3993 1t0462 3966 10481 3972 10492 3983 10489
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, Jul 19, 11:15 AM MDT, 5 hours 24 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, 3 hours 53 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, 3 hours 50 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
Special weather statement, Jul 19, 2:55 PM MDT, 1 hour 44 minutes before
COZ040-042-045-192200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 255 PM MDT SAT JUL 19 1997 ...WEAK SHORT-LIVED TORNADOES MAY BE DEVELOPING NORTH AND EAST OF DENVER... AT 255 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED QUICKLY DEVELOPING THUNDERSTORMS OVER SOUTHEAST WELD COUNTY. THESE STORMS WERE DEVELOPING ON COLLIDING THUNDERSTORM OUTFLOW BOUNDARIES. AS STORMS CONTINUE TO DEVELOP ALONG THE BOUNDARIES... THERE IS POTENTIAL THAT THESE STORMS COULD PRODUCE WEAK SHORT-LIVED TORNADOES. PERSONS BETWEEN PROSPECT VALLEY IN SOUTHEAST WELD COUNTY AND DENVER INTERNATIONAL AIRPORT SHOULD BE ON THE LOOKOUT FOR DANGEROUS WEATHER CONDITIONS. IF THREATENING WEATHER APPROACHES...TAKE SHELTER IN A REINFORCED BUILDING. STAY AWAY FROM WINDOWS. BARJENBRUCH
Special weather statement, Jul 19, 2:56 PM MDT, 1 hour 43 minutes before
COZ040-042-045-192200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 255 PM MDT SAT JUL 19 1997 ...WEAK SHORT-LIVED TORNADOES MAY BE DEVELOPING NORTH AND EAST OF DENVER... AT 255 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED QUICKLY DEVELOPING THUNDERSTORMS OVER SOUTHEAST WELD COUNTY. THESE STORMS WERE DEVELOPING ON COLLIDING THUNDERSTORM OUTFLOW BOUNDARIES. AS STORMS CONTINUE TO DEVELOP ALONG THE BOUNDARIES... THERE IS POTENTIAL THAT THESE STORMS COULD PRODUCE WEAK SHORT-LIVED TORNADOES. PERSONS BETWEEN PROSPECT VALLEY IN SOUTHEAST WELD COUNTY AND DENVER INTERNATIONAL AIRPORT SHOULD BE ON THE LOOKOUT FOR DANGEROUS WEATHER CONDITIONS. IF THREATvENING WEATHER APPROACHES...TAKE SHELTER IN A REINFORCED BUILDING. STAY AWAY FROM WINDOWS. BARJENBRUCH
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, 1:35 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 30 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.