Alert archive / Colorado / Special Weather Statements in 2021
Special Weather Statement, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this special weather statement at Jul 2, 2021, 5:13 PM MDT for Jefferson County, Colorado. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 2, 2021, 5:13 PM MDT (23:13 UTC)
- Expired
- Jul 2, 2021, 5:45 PM MDT
- In force
- 32 min
- Issued by
- NWS Denver/Boulder, CO
County Jefferson County, CO
The radar
The Denver radar (KFTG), 86 km from the middle of the area, began a volume at 23:12 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.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.2 hours before the alert went out and 190 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
- 1152 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
244 WWUS85 KBOU 022313 SPSBOU Special Weather Statement National Weather Service Denver CO 513 PM MDT Fri Jul 2 2021 COZ034-036-022345- South and Southeast Grand/West Central and Southwest Boulder/Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet CO- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet CO- 513 PM MDT Fri Jul 2 2021 ...SPECIAL WEATHER STATEMENT... At 512 PM MDT, Doppler radar was tracking a strong thunderstorm near Deckers, or 32 miles southwest of Denver, moving east at 10 mph. Half inch hail and very heavy rainfall will occur with this storm. Locations impacted include... Roxborough Park, Buffalo Creek, Devil's Head, Wellington Lake, Pine Grove, Sprucewood, South Platte, Deckers and Bailey. LAT...LON 3924 10551 3942 10549 3944 10508 3921 10506 TIME...MOT...LOC 2312Z 262DEG 9KT 3931 10523 $$ SCHLATTER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 1, 6:21 PM MDT | Flash Flood Warning | BOU | Jefferson, Park | 114 min |
| Jul 1, 6:48 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Elbert | 87 min |
| Jul 1, 6:52 PM MDT | Areal Flood Advisory | BOU | Weld | 83 min |
| Jul 2, 1:37 PM MDT | Areal Flood Advisory | BOU | Grand | 67 min |
| Jul 2, 2:26 PM MDT | Areal Flood Advisory | BOU | Larimer | 2 hr |
| Jul 2, 3:26 PM MDT | Areal Flood Advisory | BOU | Larimer | 59 min |
| Jul 2, 3:37 PM MDT | Areal Flood Advisory | BOU | Park | 63 min |
Nearby
Special Weather Statements in Colorado, 2021Every special weather statement in 2021
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.