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 Aug 14, 2021, 9:31 PM MDT for Weld County, Colorado. It was in force for 44 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
- Aug 14, 2021, 9:31 PM MDT (03:31 UTC)
- Expired
- Aug 14, 2021, 10:15 PM MDT
- In force
- 44 min
- Issued by
- NWS Denver/Boulder, CO
- Hail
- 0.50 in
- Wind
- 50
County Weld County, CO
The radar
The Denver radar (KFTG), 63 km from the middle of the area, began a volume at 03:35 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 00:00Z, 3.5 hours before the alert went out and 122 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
- 666 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 3335 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted.
307
WWUS85 KBOU 150331
SPSBOU
Special Weather Statement
National Weather Service Denver CO
931 PM MDT Sat Aug 14 2021
COZ043-150415-
Central and South Weld County CO-
931 PM MDT Sat Aug 14 2021
...A strong thunderstorm will impact portions of south central Weld
County through 1015 PM MDT...
At 930 PM MDT, Doppler radar was tracking a strong thunderstorm over
Gill, or 10 miles east of Greeley, moving south at 25 mph.
HAZARD...Wind gusts up to 50 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Kersey, Gill, Barnesville and Roggen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4050 10465 4052 10445 4014 10427 4012 10459
TIME...MOT...LOC 0330Z 346DEG 22KT 4046 10456
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
$$
GIMMESTADThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 6:48 PM MDT | Flash Flood Warning | BOU | Larimer | 115 min |
| Aug 14, 7:15 PM MDT | Special Weather Statement | BOU | Summit | 30 min |
| Aug 14, 7:38 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 52 min |
| Aug 14, 8:01 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 44 min |
| Aug 14, 8:28 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 47 min |
| Aug 14, 8:29 PM MDT | Severe Thunderstorm Warning | BOU | Sedgwick | 46 min |
| Aug 14, 8:43 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Washington | 47 min |
| Aug 14, 9:15 PM MDT | Severe Thunderstorm Warning | BOU | Phillips, Sedgwick | 14 min |
| Aug 14, 9:28 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Washington | 47 min |
| Aug 15, 2:32 PM MDT | Areal Flood Advisory | BOU | Grand | 88 min |
| Aug 15, 5:19 PM MDT | Special Weather Statement | BOU | Lincoln | 41 min |
| Aug 15, 5:25 PM MDT | Special Weather Statement | BOU | Teller | 65 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.