Alert archive / Colorado / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 68, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 1, 1991, 5:44 PM MDT for Boulder County, Weld County, Colorado. It was in force for 46 min. 2 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
- Jun 1, 1991, 5:44 PM MDT (23:44 UTC)
- Expired
- Jun 1, 1991, 6:30 PM MDT
- In force
- 46 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Boulder County, CO, Weld County, CO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 1, 6:05 PM MDT | Thunderstorm Wind 70 | Boulder, CO | |
| Jun 1, 6:20 PM MDT | Thunderstorm Wind 57 | Boulder, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 11.7 hours before the alert went out and 149 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
- 3 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1108 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 201 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, Jun 1, 2:47 PM MDT, 2 hours 57 minutes before
COZ011-012200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 245 PM MDT SAT JUN 1 1991 ...STRONG THUNDERSTORM IN FOOTHILLS NORTHWEST OF BOULDER... AT 240 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM BETWEEN LYONS AND JAMESTOWN IN NORTHERN BOULDER COUNTY...ABOUT 35 MILES NORTHWEST OF DENVER. THIS STORM WAS MOVING TO THE NORTHWEST AT 15 TO 20 MPH. ALL PEOPLE IN NORTHERN BOULDER COUNTY AND SOUTHWESTERN LARIMER COUNTY INCLUDING THE TOWNS OF JAMESTOWN...LYONS...RAYMOND...ALLENSPARK... MEEKER PARK AND ESTES PARK SHOULD BE ALERT FOR DANGEROUS FREQUENT LIGHTNING...HAIL AND STRONG GUSTY WINDS FROM THIS STORM UNTIL 400 PM MDT THIS AFTERNOON. HEAVY RAIN FROM THIS STORM WILL PRODUCE FLOODING OF NORMALLY DRY GULCHES...SMALL STREAMS...HIGHWAYS...AND LOW LYING OR FLOOD PRONE AREAS. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR MOST OF NORTHEAST COLORADO UNTIL MIDNIGHT TONIGHT. GARD...WSFO DENVER
Special weather statement, Jun 1, 4:02 PM MDT, 1 hour 42 minutes before
COZ011-012300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 400 PM MDT SAT JUN 1 1991 ...STRONG THUNDERSTORMS OVER SOUTHWEST METRO DENVER... AT 355 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER THE SOUTHWEST PORTION OF THE DENVER METRO AREA IN LAKEWOOD NEAR SOUTHWEST PLAZA SHOPPING CENTER. PEA TO MARBLE SIZE HAIL HAS BEEN REPORTED FROM THESE STORMS. THE STORMS WERE MOVING TO THE NORTHWEST AT 15 TO 20 MPH AND WILL BE MOVING OVER MORRISON... EVERGREEN AND GOLDEN. ALL PEOPLE IN WEST AND SOUTHWEST METRO DENVER SHOULD BE ALERT FOR DANGEROUS FREQUENT LIGHTNING...HAIL AND STRONG GUSTY WINDS FROM THESE STORMS UNTIL 500 PM MDT THIS AFTERNOON. HEAVY RAIN FROM THIS STORM WILL PRODUCE FLOODING OF NORMALLY DRY GULCHES...SMALL STREAMS...HIGHWAYS...STREETS...AND LOW LYING OR FLOOD PRONE AREAS INCLUDING LENA GULCH. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR MOST OF NORTHEAST COLORADOd UNTIL MIDNIGHT TONIGHT. GARD...WSFO DENVER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 6:09 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson | 51 min |
| May 31, 6:12 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 48 min |
| May 31, 6:46 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 59 min |
| May 31, 7:43 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 62 min |
| May 31, 8:38 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 67 min |
| May 31, 9:06 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 39 min |
| May 31, 9:37 PM MDT | Tornado Warning | BOU | Morgan | 38 min |
| May 31, 9:44 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 46 min |
| May 31, 10:02 PM MDT | Tornado Warning | BOU | Adams, Arapahoe, Washington | 28 min |
| May 31, 10:25 PM MDT | Tornado Warning | BOU | Logan, Morgan, Washington | 35 min |
| May 31, 10:26 PM MDT | Tornado Warning | BOU | Adams, Washington | 34 min |
| May 31, 10:38 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 52 min |
| May 31, 10:48 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 42 min |
| May 31, 11:00 PM MDT | Tornado Warning | BOU | Morgan, Washington | 45 min |
| May 31, 11:05 PM MDT | Tornado Warning | BOU | Logan, Washington | 40 min |
| May 31, 11:33 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 42 min |
| May 31, 11:49 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 26 min |
| May 31, 11:51 PM MDT | Tornado Warning | BOU | Logan | 24 min |
| Jun 1, 12:15 AM MDT | Severe Thunderstorm Warning | BOU | Washington | 30 min |
| Jun 1, 12:15 AM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
| Jun 1, 12:26 AM MDT | Tornado Warning | BOU | Washington | 34 min |
| Jun 1, 1:01 AM MDT | Tornado Warning | BOU | Washington | 29 min |
| Jun 1, 4:05 PM MDT | Severe Thunderstorm Warning | BOU | Denver, Jefferson | 40 min |
| Jun 1, 4:05 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 40 min |
| Jun 1, 4:36 PM MDT | Tornado Warning | BOU | Jefferson | 24 min |
| Jun 1, 4:57 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Boulder, Denver, Jefferson | 48 min |
| Jun 1, 5:20 PM MDT | Flash Flood Warning | BOU | Adams, Jefferson | 115 min |
| Jun 1, 5:33 PM MDT | Tornado Warning | BOU | Boulder, Jefferson | 27 min |
| Jun 1, 5:44 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver, Jefferson | 46 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1991Every severe thunderstorm warning in 1991
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.