Alert archive / Colorado / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 97, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 3, 2021, 5:05 PM MDT for Logan County, Colorado. It was in force for 25 min. 1 report 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
- Jul 3, 2021, 5:05 PM MDT (23:05 UTC)
- Expired
- Jul 3, 2021, 5:30 PM MDT
- In force
- 25 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 50.0 mph
County Logan County, CO
The radar
The Goodland radar (KGLD), 169 km from the middle of the area, began a volume at 23:08 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 |
|---|---|---|---|
| Jul 3, 5:17 PM MDT | HAIL 1.5 | Fleming, CO | L660. |
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 |
|---|---|---|---|
| Jul 3, 3:33 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.1 hours before the alert went out and 100 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
- 2605 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
194
WUUS55 KBOU 032305
SVRBOU
COC075-032330-
/O.NEW.KBOU.SV.W.0097.210703T2305Z-210703T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
505 PM MDT Sat Jul 3 2021
The National Weather Service in Denver Colorado has issued a
* Severe Thunderstorm Warning for...
Southeastern Logan County in northeastern Colorado...
* Until 530 PM MDT.
* At 505 PM MDT, a severe thunderstorm was located near Fleming, or
21 miles east of Sterling, moving east at 10 mph.
HAZARD...Half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Fleming and St Petersburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4080 10265 4071 10265 4070 10267 4060 10266
4048 10269 4051 10289 4083 10285
TIME...MOT...LOC 2305Z 287DEG 10KT 4065 10279
HAIL...1.25IN
WIND...<50MPH
$$
RPK1 follow-up statement
967
WWUS55 KBOU 032331
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
531 PM MDT Sat Jul 3 2021
COC075-032341-
/O.EXP.KBOU.SV.W.0097.000000T0000Z-210703T2330Z/
Logan CO-
531 PM MDT Sat Jul 3 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LOGAN COUNTY HAS
EXPIRED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire. However small
hail and heavy rain are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
northeastern Colorado.
LAT...LON 4080 10265 4071 10265 4070 10267 4060 10266
4048 10269 4051 10289 4083 10285
TIME...MOT...LOC 2331Z 287DEG 10KT 4063 10270
$$
RPKThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 6:36 PM MDT | Special Weather Statement | BOU | Denver | 24 min |
| Jul 2, 6:42 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 33 min |
| Jul 2, 7:11 PM MDT | Areal Flood Advisory | BOU | Adams | 47 min |
| Jul 2, 7:13 PM MDT | Special Weather Statement | BOU | Denver | 32 min |
| Jul 2, 7:17 PM MDT | Areal Flood Advisory | BOU | Larimer | 88 min |
| Jul 3, 2:03 PM MDT | Areal Flood Advisory | BOU | Larimer | 87 min |
| Jul 3, 2:22 PM MDT | Special Weather Statement | BOU | Weld | 38 min |
| Jul 3, 3:11 PM MDT | Special Weather Statement | BOU | Weld | 34 min |
| Jul 3, 3:23 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 37 min |
| Jul 3, 3:57 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 33 min |
| Jul 3, 4:25 PM MDT | Special Weather Statement | BOU | Logan | 20 min |
| Jul 3, 4:34 PM MDT | Special Weather Statement | BOU | Logan | 26 min |
| Jul 3, 4:45 PM MDT | Special Weather Statement | BOU | Morgan | 30 min |
| Jul 3, 4:53 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 37 min |
| Jul 3, 4:59 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 31 min |
| Jul 3, 5:14 PM MDT | Special Weather Statement | BOU | Elbert | 31 min |
| Jul 3, 5:20 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 25 min |
| Jul 3, 5:29 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 31 min |
| Jul 3, 5:38 PM MDT | Areal Flood Advisory | BOU | Logan | 82 min |
| Jul 3, 5:40 PM MDT | Areal Flood Advisory | BOU | Elbert | 95 min |
| Jul 3, 5:56 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 34 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.