Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 13, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 2, 2021, 11:40 AM MDT for Adams County, Arapahoe County, Denver 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
- May 2, 2021, 11:40 AM MDT (17:40 UTC)
- Expired
- May 2, 2021, 12:30 PM MDT
- In force
- 50 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Adams County, CO, Arapahoe County, CO, Denver County, CO
The radar
The Denver radar (KFTG), 14 km from the middle of the area, began a volume at 17:43 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 |
|---|---|---|---|
| May 2, 11:47 AM MDT | TSTM WND GST 62 | Denver Intl Airport, CO | |
| May 2, 11:50 AM MDT | TSTM WND DMG | 2 N Manila Village, CO | REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 5.7 hours before the alert went out and 126 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
- 1976 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- -89 m²/s²
- 0-3 km storm-relative helicity
- 10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
812 WUUS55 KBOU 021740 SVRBOU COC001-005-031-021830- /O.NEW.KBOU.SV.W.0013.210502T1740Z-210502T1830Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Denver CO 1140 AM MDT Sun May 2 2021 The National Weather Service in Denver Colorado has issued a * Severe Thunderstorm Warning for... Western Arapahoe County in northeastern Colorado... Northeastern Denver County in northeastern Colorado... Western Adams County in northeastern Colorado... * Until 1230 PM MDT. * At 1140 AM MDT, a severe thunderstorm was located 4 miles southwest of Barr Lake, or 14 miles north of Denver, moving east at 25 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Northeastern Denver, Aurora, eastern Thornton, Commerce City, Brighton, Denver International Airport, D.I.A Terminal and Concourses, Bennett, Manila Village, Buckley AFB, Watkins, Barr Lake, Todd Creek and Strasburg. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3976 10498 3999 10490 3999 10425 3957 10443 TIME...MOT...LOC 1740Z 288DEG 23KT 3992 10485 HAIL...0.88IN WIND...60MPH $$ MEIER
1 follow-up statement
992
WWUS55 KBOU 021821
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
1221 PM MDT Sun May 2 2021
COC001-005-031-021830-
/O.EXP.KBOU.SV.W.0013.000000T0000Z-210502T1830Z/
Arapahoe CO-Denver CO-Adams CO-
1221 PM MDT Sun May 2 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN ARAPAHOE...
NORTHEASTERN DENVER AND WESTERN ADAMS COUNTIES WILL EXPIRE AT 1230 PM
MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds to 50 mph are still possible.
A Severe Thunderstorm Watch remains in effect until 700 PM MDT for
northeastern Colorado.
LAT...LON 3976 10498 3999 10490 3999 10425 3957 10443
TIME...MOT...LOC 1820Z 288DEG 23KT 3984 10454
$$
MEIERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 7:40 PM MDT | Special Weather Statement | BOU | Broomfield | 35 min |
| May 2, 3:42 AM MDT | Winter Storm Warning | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more | 34 hr |
| May 2, 10:36 AM MDT | Special Weather Statement | BOU | Boulder | 24 min |
| May 2, 11:01 AM MDT | Special Weather Statement | BOU | Broomfield | 29 min |
| May 2, 1:17 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Logan, Morgan, Washington | 28 min |
| May 2, 2:13 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 32 min |
| May 2, 2:19 PM MDT | Winter Weather Advisory | BOU | Boulder, Clear Creek, Douglas, Gilpin, Grand, Jackson and 3 more | 23 hr |
| May 2, 4:07 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| May 2, 5:04 PM MDT | Special Weather Statement | BOU | Weld | 41 min |
| May 2, 5:47 PM MDT | Areal Flood Advisory | BOU | Boulder | 88 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.