Alert archive / Colorado / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 820
The Storm Prediction Center issued this severe thunderstorm watch at Sep 14, 2004, 2:20 PM MDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 14, 2004, 2:20 PM MDT (20:20 UTC)
- Expired
- Sep 14, 2004, 9:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 23 counties
Adams County, CO, Arapahoe County, CO, Broomfield County, CO, Denver County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Arthur County, NE, Banner County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Keith County, NE, Kimball County, NE, Perkins County, NE, Laramie County, WY
The radar
The Cheyenne radar (KCYS), 104 km from the middle of the area, began a volume at 20:23 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
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 2:38 PM MDT | Severe Thunderstorm Warning | CYS | Banner | 52 min |
| Sep 14, 3:26 PM MDT | Severe Thunderstorm Warning | CYS | Banner | 49 min |
| Sep 14, 3:39 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 51 min |
| Sep 14, 3:59 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 46 min |
| Sep 14, 4:11 PM MDT | Severe Thunderstorm Warning | CYS | Banner | 34 min |
| Sep 14, 4:16 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 44 min |
| Sep 14, 4:22 PM MDT | Tornado Warning | BOU | Washington | 38 min |
| Sep 14, 4:56 PM MDT | Tornado Warning | BOU | Washington | 49 min |
| Sep 14, 5:05 PM MDT | Severe Thunderstorm Warning | LBF | Garden | 55 min |
| Sep 14, 5:08 PM MDT | Tornado Warning | GLD | Yuma | 67 min |
| Sep 14, 5:14 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 46 min |
| Sep 14, 5:55 PM MDT | Severe Thunderstorm Warning | LBF | Garden | 65 min |
| Sep 14, 5:58 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 32 min |
| Sep 14, 6:05 PM MDT | Severe Thunderstorm Warning | LBF | Deuel | 55 min |
| Sep 14, 6:15 PM MDT | Severe Thunderstorm Warning | GLD | Yuma | 30 min |
| Sep 14, 6:16 PM MDT | Severe Thunderstorm Warning | GLD | Cheyenne | 59 min |
| Sep 14, 6:19 PM MDT | Severe Thunderstorm Warning | LBF | Arthur | 56 min |
| Sep 14, 7:16 PM MDT | Severe Thunderstorm Warning | GLD | Dundy | 29 min |
| Sep 14, 7:36 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 39 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, 8.3 hours before the alert went out and 111 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
- 1028 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 202 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 |
|---|---|---|---|---|
| Sep 14, 1:49 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Broomfield, Denver, Elbert, Kit Carson and 8 more | 116 min |
| Sep 14, 5:44 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Broomfield, Denver, Logan, Morgan and 5 more | 91 min |
| Sep 13, 7:59 PM MDT | Mesoscale Discussion | SPC | Decatur | 61 min |
| Sep 14, 12:47 PM MDT | Mesoscale Discussion | SPC | Adams, Buffalo, Burt, Butler, Cass, Clay and 22 more | 88 min |
| Sep 14, 1:45 PM MDT | Severe Thunderstorm Watch | SPC | Burt, Butler, Cass, Colfax, Cuming, Dakota and 13 more | 7 hr |
| Sep 14, 4:14 PM MDT | Mesoscale Discussion | SPC | Burt, Butler, Cass, Colfax, Cuming, Dakota and 13 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Colorado, 2004Severe Thunderstorm Watches in Nebraska, 2004Severe Thunderstorm Watches in Kansas, 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.