Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 109, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 31, 1997, 2:25 PM MDT for Elbert County, Colorado. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 31, 1997, 2:25 PM MDT (20:25 UTC)
- Expired
- Jul 31, 1997, 3:00 PM MDT
- In force
- 35 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Elbert County, CO
The radar
The Denver radar (KFTG), 66 km from the middle of the area, began a volume at 20:25 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, 8.4 hours before the alert went out and 101 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
- 64 J/kg
- Mixed-layer CIN
- -197 J/kg
- Mixed-layer LCL
- 1163 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What 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 31, 9:56 AM MDT, 4 hours 29 minutes before
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</html>Special weather statement, Jul 31, 10:00 AM MDT, 4 hours 25 minutes before
COZ030-032>050-010600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1000 AM MDT THU JUL 31 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...TROPICAL MONSOONAL MOISTURE FROM THE GULF OF MEXICO WRAPPING AROUND AN UPPER RIDGE WILL CONTINUE TO STREAM ACROSS COLORADO TODAY AND TONIGHT. THIS WILL PROVIDE AMPLE MOISTURE FOR A CONTINUED THREAT OF HEAVY THUNDERSTORM RAIN ACROSS THE AREA. SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP ACROSS THE AREA THIS AFTERNOON AND CONTINUE INTO THE EVENING HOURS. WHILE ONE OR TWO SEVERE THUNDERSTORMS WITH LARGE HAIL AND STRONG GUSTY WINDS ARE POSSIBLE THE GREATEST WEATHER THREAT WILL BE LOCALLY HEAVY RAIN. RAINFALL OF 1.00 TO 3.00 INCHES AN HOUR IS POSSIBLE. DUE TO SATURATED SOIL MOISTURE FROM HEAVY RAINFALL OVER THE LAST SEVERAL DAYS SOME FLOODING OF SMALL STREAMS...ROADWAYS AND LOW LYING OR FLOOD PRONE AREAS REMAINS LIKELY. WHILE A FLASH FLOOD WATCH IS NOT NEEDED AT THIS TIME...THE WEATHER SITUATION WILL CONTINUE TO BE MONITORED CLOSELY THROUGHOUT THE DAY AND NIGHT AND UPDATES WILL BE ISSUED AS REQUIRED. GARD...WSFO DENVER
Special weather statement, Jul 31, 2:00 PM MDT, 25 minutes before
COZ041-312045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 200 PM MDT THU JUL 31 1997 ...THUNDERSTORMS WITH HEAVY RAIN IN WESTERN ELBERT COUNTY... AT 155 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH HEAVY RAIN OVER WESTERN ELBERT COUNTY. SMALL HAIL IS ALSO POSSIBLE WITH THE STORMS. THE STORMS WERE MOVING NORTHEAST AT 20 MILES PER HOUR. DOPPLER RADAR ESTIMATED UP TO AN INCH AN HOUR HAD FALLEN SOUTHWEST OF KIOWA. PERSONS IN OR NEAR ELIZABETH AND KIOWA SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. SOME ROADS MAY BE COVERED WITH WATER. DO NOT ATTEMPT TO DRIVE THROUGH WATER OF UNKNOWN DEPTH. A FLASH FLOOD WATCH IS IN EFFECT FOR MUCH OF NORTHEAST COLORADO UNTIL MIDNIGHT TONIGHT. LESZCYNSKI
Special weather statement, Jul 31, 2:03 PM MDT, 22 minutes before
COZ041-312045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 200 PM MDT THU JUL 31 1997 ...THUNDERSTORMS WITH HEAVY RAIN IN WESTERN ELBERT COUNTY... AT 155 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH HEAVY RAIN OVER WESTERN ELBERT COUNTY. SMALL HAIL IS ALSO POSSIBLE WITH THE STORMS. THE STORMS WERE MOVING NORTHEAST AT 20 MILES PER HOUR. DOPPLER RADAR ESTIMATED UP TO AN INCH AN HOUR HAD FALLEN SOUTHWEST OF KIOWA. PERSONS IN OR NEAR ELIZABETH AND KIOWA SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. SOME ROADS MAY BE COVERED WITH WATER. DO NOT ATTEMPT TO DRIVE 0 THROUGH WATER OF UNKNOWN DEPTH. A FLASH FLOOD WATCH IS IN EFFECT FOR MUCH OF NORTHEAST COLORADO UNTIL MIDNIGHT TONIGHT. LESZCYNSKI
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 6:35 PM MDT | Flash Flood Warning | BOU | Logan, Weld | 3 hr |
| Jul 30, 8:05 PM MDT | Flash Flood Warning | BOU | Arapahoe, Denver | 115 min |
| Jul 31, 3:28 PM MDT | Tornado Warning | BOU | Elbert | 32 min |
| Jul 31, 4:00 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln, Washington | 60 min |
| Jul 31, 4:00 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 60 min |
| Jul 31, 5:27 PM MDT | Flash Flood Warning | BOU | Morgan | 2 hr |
| Jul 31, 5:30 PM MDT | Flash Flood Warning | BOU | Logan, Washington | 3 hr |
| Jul 31, 5:30 PM MDT | Flash Flood Warning | BOU | Douglas | 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.