Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 130, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 19, 2021, 2:46 PM MDT for Adams County, Weld County, Colorado. It was in force for 29 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 19, 2021, 2:46 PM MDT (20:46 UTC)
- Expired
- Aug 19, 2021, 3:15 PM MDT
- In force
- 29 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Adams County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 31 km from the middle of the area, began a volume at 20:45 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 19, 1:14 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 8.8 hours before the alert went out and 124 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
- 246 J/kg
- Mixed-layer CIN
- -241 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- -59 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
485
WUUS55 KBOU 192046
SVRBOU
COC001-123-192115-
/O.NEW.KBOU.SV.W.0130.210819T2046Z-210819T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
246 PM MDT Thu Aug 19 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
South central Weld County in northeastern Colorado...
North central Adams County in northeastern Colorado...
* Until 315 PM MDT.
* At 246 PM MDT, a severe thunderstorm was located near Hudson, or 24
miles south of Greeley, moving northeast at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
* This severe thunderstorm will be near...
Hudson around 255 PM MDT.
Keenesburg around 305 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3992 10473 4012 10484 4024 10457 4003 10445
TIME...MOT...LOC 2046Z 230DEG 22KT 4006 10467
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
RPKThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 1:23 PM MDT | Special Weather Statement | BOU | Logan | 22 min |
| Aug 19, 2:01 PM MDT | Special Weather Statement | BOU | Logan | 29 min |
| Aug 19, 2:13 PM MDT | Special Weather Statement | BOU | Broomfield | 17 min |
| Aug 19, 2:17 PM MDT | Special Weather Statement | BOU | Broomfield | 28 min |
| Aug 19, 2:24 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Broomfield, Jefferson | 36 min |
| Aug 19, 2:30 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 30 min |
| Aug 19, 2:39 PM MDT | Tornado Warning | BOU | Adams, Broomfield, Jefferson | 36 min |
| Aug 19, 2:59 PM MDT | Areal Flood Advisory | BOU | Adams | 61 min |
| Aug 19, 3:05 PM MDT | Tornado Warning | BOU | Adams, Weld | 25 min |
| Aug 19, 3:12 PM MDT | Tornado Warning | BOU | Douglas | 18 min |
| Aug 19, 3:14 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 31 min |
| Aug 19, 3:35 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 25 min |
| Aug 19, 3:42 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 33 min |
| Aug 19, 3:44 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 31 min |
| Aug 19, 3:46 PM MDT | Tornado Warning | BOU | Douglas, Elbert | 14 min |
| Aug 19, 3:49 PM MDT | Severe Thunderstorm Warning | BOU | Phillips | 41 min |
| Aug 19, 3:51 PM MDT | Severe Thunderstorm Warning | BOU | Sedgwick | 24 min |
| Aug 19, 3:55 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Denver, Douglas | 22 min |
| Aug 19, 3:58 PM MDT | Areal Flood Advisory | BOU | Weld | 30 min |
| Aug 19, 4:04 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 41 min |
| Aug 19, 4:06 PM MDT | Areal Flood Advisory | BOU | Logan | 54 min |
| Aug 19, 4:07 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 32 min |
| Aug 19, 4:10 PM MDT | Areal Flood Advisory | BOU | Phillips | 95 min |
| Aug 19, 4:17 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 43 min |
| Aug 19, 4:18 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 42 min |
| Aug 19, 4:25 PM MDT | Severe Thunderstorm Warning | BOU | Phillips | 35 min |
| Aug 19, 4:32 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe | 28 min |
| Aug 19, 4:34 PM MDT | Tornado Warning | BOU | Phillips | 26 min |
| Aug 19, 4:52 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 23 min |
| Aug 19, 4:57 PM MDT | Areal Flood Advisory | BOU | Logan | 50 min |
| Aug 19, 4:57 PM MDT | Tornado Warning | BOU | Phillips | 33 min |
| Aug 19, 5:00 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan | 30 min |
| Aug 19, 5:04 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 25 min |
| Aug 19, 5:09 PM MDT | Flash Flood Warning | BOU | Phillips | 3 hr |
| Aug 19, 5:34 PM MDT | Severe Thunderstorm Warning | BOU | Phillips | 26 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2021Every severe thunderstorm warning 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.