Alert archive / Colorado / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 31, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 28, 1987, 1:14 PM MDT for Morgan County, Weld County, Colorado. It was in force for 61 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
- Jun 28, 1987, 1:14 PM MDT (19:14 UTC)
- Expired
- Jun 28, 1987, 2:15 PM MDT
- In force
- 61 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Morgan County, CO, Weld County, CO
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 28, 2:13 PM MDT | Hail 0.75 | Weld, 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, 7.2 hours before the alert went out and 95 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2946 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 48 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 28, 12:10 PM MDT, 1 hour 4 minutes before
SPECIAL WEATHER STATEMENT/SHORT RANGE FORECAST NATIONAL WEATHER SERVICE DENVER CO 1207 PM MDT SAT JUN 27 1987 ....STRONG THUNDERSTORM NORTH OF FT COLLINS... AS OF 1205 PM MDT A STRONG THUNDERSTORM HAD DEVELOPED ABOUT 20 MILES NORTHEAST OF FORT COLLINS COLORADO...NEAR THE TOWN OF WARREN. THIS STORM SHOULD MOVE SOUTHEAST AND MAY BRING BRIEF HEAVY RAIN...SMALL HAIL AND STRONG GUSTY WINDS TO CARR...NUNN AND DOVER BETEWEEN NOW AND 130 PM MDT. THIS STORM IS PROBABLY THE BEGINNINGS OF A LINE OF STORMS WHICH IS EXPECTED TO DEVELOP NEAR THE WYOMING BORDER EARLY THIS AFTERNOON AND MOVE SOUTHWARD AHEAD OF A COLD FRONT. THE STORMS MAY BECOME SEVERE...ESPECIALLY ON THE NORTHEAST PLAINS. KAPLA
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 3:27 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 63 min |
| Jun 28, 4:47 PM MDT | Tornado Warning | BOU | Arapahoe, Washington | 18 min |
| Jun 28, 5:06 PM MDT | Severe Thunderstorm Warning | BOU | Washington, Yuma | 59 min |
| Jun 28, 5:06 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe | 59 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1987Every severe thunderstorm warning in 1987
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.