Alert archive / Colorado / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 671
The Storm Prediction Center issued this severe thunderstorm watch at Jul 29, 2004, 1:55 PM MDT for 11 counties in Colorado; 11 counties in Nebraska; Goshen County, Laramie County, Platte County, Wyoming. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2004, 1:55 PM MDT (19:55 UTC)
- Expired
- Jul 29, 2004, 8:00 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 25 counties
Adams County, CO, Arapahoe County, CO, Elbert County, CO, Kit Carson County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Goshen County, WY, Laramie County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 130 km from the middle of the area, began a volume at 19:58 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.
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 2:17 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 43 min |
| Jul 29, 3:37 PM MDT | Severe Thunderstorm Warning | CYS | Dawes | 53 min |
| Jul 29, 3:39 PM MDT | Tornado Warning | BOU | Morgan, Washington | 41 min |
| Jul 29, 4:09 PM MDT | Severe Thunderstorm Warning | CYS | Sioux | 51 min |
| Jul 29, 4:25 PM MDT | Severe Thunderstorm Warning | LBF | Sheridan | 65 min |
| Jul 29, 4:55 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 47 min |
| Jul 29, 4:56 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 46 min |
| Jul 29, 5:28 PM MDT | Flash Flood Warning | BOU | Washington | 3 hr |
| Jul 29, 5:29 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 46 min |
| Jul 29, 5:31 PM MDT | Severe Thunderstorm Warning | LBF | Sheridan | 44 min |
| Jul 29, 5:49 PM MDT | Tornado Warning | BOU | Washington | 56 min |
| Jul 29, 6:11 PM MDT | Severe Thunderstorm Warning | LBF | Garden | 64 min |
| Jul 29, 7:03 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Morrill | 42 min |
| Jul 29, 7:46 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 44 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 7.9 hours before the alert went out and 175 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
- 10 J/kg
- Mixed-layer CIN
- -327 J/kg
- Mixed-layer LCL
- 1334 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 12:53 PM MDT | Mesoscale Discussion | SPC | Logan, Phillips, Sedgwick | 3 hr |
| Jul 29, 3:50 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Cheyenne, Crowley, Huerfano, Kiowa and 5 more | 25 min |
| Jul 29, 4:30 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Elbert, Kit Carson, Logan, Morgan and 5 more | 30 min |
| Jul 29, 5:15 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Cheyenne, Crowley, Kiowa, Las Animas and 3 more | 60 min |
| Jul 29, 4:30 PM MDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Boyd, Brown, Cherry, Garfield and 10 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Colorado, 2004Severe Thunderstorm Watches in Nebraska, 2004Severe Thunderstorm Watches in Wyoming, 2004Every severe thunderstorm watch in 2004
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.