Alert archive / Colorado / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 740
The Storm Prediction Center issued this severe thunderstorm watch at Aug 11, 2004, 1:20 PM MDT for 19 counties in Colorado. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2004, 1:20 PM MDT (19:20 UTC)
- Expired
- Aug 11, 2004, 8:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Crowley County, CO, Denver County, CO, Douglas County, CO, El Paso County, CO, Elbert County, CO, Huerfano County, CO, Jefferson County, CO, Las Animas County, CO, Lincoln County, CO, Morgan County, CO, Otero County, CO, Pueblo County, CO, Teller County, CO, Washington County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 62 km from the middle of the area, began a volume at 19:20 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
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 3:27 PM MDT | Severe Thunderstorm Warning | PUB | Teller | 48 min |
| Aug 11, 3:58 PM MDT | Severe Thunderstorm Warning | PUB | Las Animas | 92 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
Grand Junction, CO (KGJT), launched 12:00Z, 7.3 hours before the alert went out and 384 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
- 3620 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 46 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 |
|---|---|---|---|---|
| Aug 10, 6:46 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Broomfield, Crowley, Denver, Douglas and 6 more | 59 min |
| Aug 10, 8:35 PM MDT | Tornado Watch | SPC | Baca, Bent, Crowley, Huerfano, Kiowa, Las Animas and 3 more | 4 hr |
| Aug 11, 12:11 PM MDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Crowley and 14 more | 94 min |
| Aug 11, 5:27 PM MDT | Mesoscale Discussion | SPC | Crowley, Denver, Douglas, Elbert, El Paso, Huerfano and 6 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Colorado, 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.