Alert archive / Colorado / Severe Thunderstorm Warnings in 1996
Severe Thunderstorm Warning 121, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 12, 1996, 7:02 PM MDT for Douglas County, Jefferson County, Colorado. It was in force for 43 min. 3 reports 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 12, 1996, 7:02 PM MDT (01:02 UTC)
- Expired
- Jul 12, 1996, 7:45 PM MDT
- In force
- 43 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Douglas County, CO, Jefferson County, CO
The radar
The Denver radar (KFTG), 59 km from the middle of the area, began a volume at 01:04 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 12, 7:02 PM MDT | Hail 1.25 | Evergreen, CO | |
| Jul 12, 7:19 PM MDT | Hail 1.5 | Morrison, CO | |
| Jul 12, 7:22 PM MDT | Hail 1 | Lakewood, 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 00:00Z, 1.0 hours before the alert went out and 166 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
- 1200 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 1461 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 5.2
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 12, 4:10 PM MDT, 2 hours 52 minutes before
COZ035-038-122300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 410 PM MDT FRIDAY JULY 12 1996 ...HAIL AND STRONG THUNDERSTORM IN LARIMER COUNTY... A STRONG THUNDERSTORM WAS MOVING THROUGH CENTRAL LARIMER COUNTY AT 410 PM MDT. THIS THUNDERSTORM WAS APPROACHING THE TOWN OF RUSTIC AND WAS MOVING EAST ABOUT 20 MPH WHICH MEANS IT WILL PASS OVER POUDRE PARK AND APPROACH FORT COLLINS BY 5 PMN MDT. 1/2 INCH DIAMETER HAIL WAS REPORTED 9 MILES WEST SOPUTHWEST OF THE TOWN OF RUSTIC. IF THIS THUNDERSTORM APPROACHES YOUR AREA MOVE INDOORS. AVOID BECOMING A VICTIM OF LIGHTNING OR SUFFERING DAMAGE FROM HAIL. HEAVY RAIN IS ALSO POSSIBLE WITH THE THUNDERSTORM. MOTORISTS IN LARIMER COUNTY SHOULD BE ALERT FOR PONDING OF WATER ON ROADWAYS ESPECIALLY IN LOW LYING AREAS. A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF EASTERN COLORADO UNTIL 8 PM MDT. END...GCF...WSFO DENVER
Special weather statement, Jul 12, 5:27 PM MDT, 1 hour 35 minutes before
COZ038-130030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 525 PM MDT FRIDAY JULY 12 1996 ...THUNDERSTORM APPROACHING PAWNEE GRASSLANDS... RADAR INDICATES THAT A STRONG THUNDERSTORM HAS MOVED ACROSS THE WYOMING BORDER INTO NORTHWEST WELD COUNTY. THE THUNDERSTORM WAS LOCATED 5 MILES NORTH OF ROCKPOR COLORADO OR ABOUT 25 MILES SOUTH OF CHEYENNE WYOMIONG AT 525 PM MDT. IT WAS MOVING TO THE SOUTHEAST ABOUT 20 MPH AND WILL MOVE INTO THE PAWNEE GRASSLANDS BETWEEN 6 AND 630 PM MDT. IF YOU ARE IN THE OPEN SEEK SHELTER IF THIS THUNDERSTORM APPROACHES. IT MAY CONTAIN MARBLE OR LARGER SIZE HAIL ALONG WITH MODERATE TO HEAVY RAIN AND DEADLY LIGHTNING. WIND GUSTS TO 40 OR 50 MPH ARE ALSO POSSIBLE WITH THIS THUNDERSTORM. MOTORISTS DRIVING ALONG HIGHWAY 85 FROM NUNN NORTH TO THE WYOMING BORDER SHOULD BE ALERT FOR WATER PONDING ON ROADWAYS ESPECIALLY IN LOW LYING AREAS. A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF EASTERN COLORADO UNTIL 8 PM MDT. END...GCF...WSFO DENVER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 6:35 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 40 min |
| Jul 12, 7:10 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 50 min |
| Jul 12, 7:26 PM MDT | Tornado Warning | BOU | Adams, Arapahoe, Washington | 34 min |
| Jul 12, 7:50 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 40 min |
| Jul 12, 7:54 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver | 21 min |
| Jul 12, 7:54 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 21 min |
| Jul 12, 8:13 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Weld | 47 min |
| Jul 12, 8:20 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Douglas | 40 min |
| Jul 12, 8:50 PM MDT | Tornado Warning | BOU | Adams, Denver, Jefferson | 25 min |
| Jul 12, 8:50 PM MDT | Tornado Warning | BOU | Boulder | 25 min |
| Jul 12, 9:05 PM MDT | Tornado Warning | BOU | Weld | 25 min |
| Jul 12, 9:16 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver, Jefferson | 44 min |
| Jul 12, 9:19 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 41 min |
| Jul 12, 9:29 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 31 min |
| Jul 12, 10:01 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 44 min |
| Jul 12, 10:06 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 24 min |
| Jul 12, 10:13 PM MDT | Flash Flood Warning | BOU | Jefferson, Park | 4 hr |
| Jul 13, 2:30 AM MDT | Flash Flood Warning | BOU | Jefferson | 3 hr |
| Jul 13, 2:40 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 35 min |
| Jul 13, 3:12 PM MDT | Tornado Warning | BOU | Weld | 33 min |
| Jul 13, 3:40 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 35 min |
| Jul 13, 3:50 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 40 min |
| Jul 13, 4:10 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Washington | 35 min |
| Jul 13, 4:10 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 35 min |
| Jul 13, 4:11 PM MDT | Tornado Warning | BOU | Morgan, Washington | 34 min |
| Jul 13, 4:24 PM MDT | Tornado Warning | BOU | Elbert, Lincoln | 21 min |
| Jul 13, 4:30 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver | 45 min |
| Jul 13, 4:30 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
| Jul 13, 4:50 PM MDT | Tornado Warning | BOU | Washington | 25 min |
| Jul 13, 5:00 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 30 min |
| Jul 13, 5:15 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Elbert | 45 min |
| Jul 13, 5:15 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 6 hr |
Nearby
Severe Thunderstorm Warnings in Colorado, 1996Every severe thunderstorm warning in 1996
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.