Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 79, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 19, 2021, 3:55 PM MDT for Washington County, Colorado. It was in force for 50 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 19, 2021, 3:55 PM MDT (21:55 UTC)
- Expired
- Jun 19, 2021, 4:45 PM MDT
- In force
- 50 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Washington County, CO
The radar
The Denver radar (KFTG), 114 km from the middle of the area, began a volume at 21:57 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 19, 4:12 PM MDT | TSTM WND GST 57 | 3 E Union, CO | MESONET STATION CO183 0.75 MI W OF CO-Q. |
| Jun 19, 4:35 PM MDT | TSTM WND DMG | Akron, CO | DELAYED REPORT. SMALL TREE LIMBS DOWN ACROSS AKRON. TIME ESTIMATED BY RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 19, 1:44 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.9 hours before the alert went out and 22 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
- 2627 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
716
WUUS55 KBOU 192155
SVRBOU
COC121-192245-
/O.NEW.KBOU.SV.W.0079.210619T2155Z-210619T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
355 PM MDT Sat Jun 19 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Washington County in northeastern Colorado...
* Until 445 PM MDT.
* At 354 PM MDT, severe thunderstorms were located along a line
extending from 6 miles southeast of Prewitt Reservoir to 12 miles
south of Lindon, or along a line extending from 16 miles north of
Akron to 24 miles northeast of Limon, moving east at 30 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees. Hail damage to
vehicles is expected.
* Locations impacted include...
Akron, Otis, Thurman, Arickaree School, Anton, Prewitt Reservoir,
Elba, Burdett, Platner, Lindon and Midway.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4043 10293 3957 10300 3957 10352 4000 10349
4000 10347 4044 10346
TIME...MOT...LOC 2154Z 266DEG 26KT 4039 10325 3957 10348
TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
$$
RPKThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 8:57 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 33 min |
| Jun 19, 11:54 AM MDT | Fire Weather Watch | BOU | Grand, Jackson, Summit | 15 hr |
| Jun 19, 1:25 PM MDT | Special Weather Statement | BOU | Arapahoe | 35 min |
| Jun 19, 1:57 PM MDT | Special Weather Statement | BOU | Denver | 33 min |
| Jun 19, 2:09 PM MDT | Tornado Warning | BOU | Adams | 36 min |
| Jun 19, 2:40 PM MDT | Tornado Warning | BOU | Morgan | 35 min |
| Jun 19, 2:52 PM MDT | Tornado Warning | BOU | Adams | 23 min |
| Jun 19, 2:54 PM MDT | Tornado Warning | BOU | Elbert | 21 min |
| Jun 19, 3:14 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 31 min |
| Jun 19, 3:26 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Washington | 34 min |
| Jun 19, 3:33 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 27 min |
| Jun 19, 3:35 PM MDT | Special Weather Statement | BOU | Washington | 55 min |
| Jun 19, 3:41 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 49 min |
| Jun 19, 4:04 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 41 min |
| Jun 19, 4:09 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 51 min |
| Jun 19, 4:12 PM MDT | Tornado Warning | BOU | Washington | 33 min |
| Jun 19, 4:15 PM MDT | Tornado Warning | BOU | Logan | 30 min |
| Jun 19, 4:37 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 38 min |
| Jun 19, 4:49 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips, Sedgwick | 41 min |
| Jun 19, 4:57 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 33 min |
| Jun 19, 5:16 PM MDT | Severe Thunderstorm Warning | BOU | Phillips, Sedgwick | 29 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.