Alert archive / Colorado / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 356, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 1, 2023, 2:24 PM MDT for Jefferson County, Colorado. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 1, 2023, 2:24 PM MDT (20:24 UTC)
- Expired
- Aug 1, 2023, 3:00 PM MDT
- In force
- 36 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Jefferson County, CO
The radar
The Denver radar (KFTG), 64 km from the middle of the area, began a volume at 20:26 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 forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 1, 11:49 AM MDT, 2 hours 35 minutes earlier.
Area forecast discussion, Aug 1, 11:49 AM MDT, 2 hours 35 minutes before
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</html>Hazardous weather outlook, Aug 1, 9:58 AM MDT, 4 hours 26 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 958 AM MDT Tue Aug 1 2023 COZ030>051-021600- Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Grand and Summit Counties Below 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Central and Southeast Park County- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 958 AM MDT Tue Aug 1 2023 ...FLOOD WATCH FOR THE I-25 URBAN CORRIDOR, FRONT RANGE FOOTHILLS, NORTHEAST PLAINS, AND PORTIONS OF THE NORTHERN MOUNTAINS NOON TODAY UNTIL MIDNIGHT TONIGHT... This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight The threat of flash flooding will remain in the forecast this afternoon and evening as another round of storms with very heavy rainfall move across the area. Numerous thunderstorms will develop over the mountains in the early to mid afternoon hours, spreading east across the I-25 Corridor through the late afternoon hours and over the northeast plains this evening. The strongest storms will be capable of producing 1.5 to over 2 inches of rain in 45 minutes or less. A couple storms may also become severe with strong winds greater than 60 mph and hail up to 1.5 inches in diameter. The greatest threat of severe thunderstorms appears to be along and Palmer Divide south and east of Denver. Never drive through flooded roads or water of unknown depth. Avoid recreational activities in or near burn areas today, have multiple ways to receive warnings, and be ready to take action and move to higher ground if a warning is issued for your area. .DAYS TWO THROUGH SEVEN...Wednesday through Monday The flash flood threat will continue on Wednesday afternoon and evening. Storms that develop will be capable of producing locally heavy rain and flash flooding. Thursday and Friday will have decreased storm coverage, though there will still be a low threat of flash flooding and a few severe storms. Increased thunderstorm activity is possible again over the weekend. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today and tonight. However, any reports of heavy rainfall, flooding, hail, and strong winds will be appreciated.
In the hours before
Special weather statement, Aug 1, 2:17 PM MDT, 7 minutes before
Special Weather Statement
National Weather Service Denver CO
217 PM MDT Tue Aug 1 2023
COZ036-012100-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet CO-
217 PM MDT Tue Aug 1 2023
...A strong thunderstorm will impact portions of central Jefferson
County through 300 PM MDT...
At 217 PM MDT, Doppler radar was tracking a strong thunderstorm over
Pine Junction, or 28 miles southwest of Denver, moving east at 10
mph.
HAZARD...Winds in excess of 40 mph and nickel size 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...
Morrison, Tiny Town, Buffalo Creek, Conifer, Pine Grove, South
Platte, Aspen Park, Pine Junction and Indian Hills.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3951 10546 3952 10544 3950 10542 3952 10543
3953 10542 3951 10541 3952 10539 3950 10534
3952 10534 3956 10540 3964 10518 3939 10512
3938 10544
TIME...MOT...LOC 2017Z 256DEG 8KT 3948 10538
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH
DANIELSONThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 6:09 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 36 min |
| Jul 31, 6:35 PM MDT | Areal Flood Advisory | BOU | Douglas | 2 hr |
| Jul 31, 6:38 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson | 37 min |
| Jul 31, 6:40 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 50 min |
| Jul 31, 6:46 PM MDT | Special Weather Statement | BOU | Douglas | 44 min |
| Jul 31, 7:10 PM MDT | Flash Flood Warning | BOU | Douglas | 110 min |
| Jul 31, 7:23 PM MDT | Special Weather Statement | BOU | Arapahoe | 52 min |
| Jul 31, 7:30 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 45 min |
| Jul 31, 7:37 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 31, 7:52 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 38 min |
| Jul 31, 8:12 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 31, 8:14 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jul 31, 8:38 PM MDT | Special Weather Statement | BOU | Adams, Arapahoe | 52 min |
| Jul 31, 9:26 PM MDT | River Flood Warning | BOU | Douglas | 6 hr |
| Jul 31, 9:34 PM MDT | Special Weather Statement | BOU | Elbert | 26 min |
| Jul 31, 9:49 PM MDT | Special Weather Statement | BOU | Elbert | 26 min |
| Jul 31, 10:49 PM MDT | Special Weather Statement | BOU | Washington | 41 min |
| Jul 31, 10:51 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 24 min |
| Aug 1, 2:17 PM MDT | Special Weather Statement | BOU | Jefferson | 43 min |
| Aug 1, 2:58 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Jefferson | 32 min |
| Aug 1, 3:23 PM MDT | Flash Flood Warning | BOU | Jefferson | 3 hr |
| Aug 1, 3:27 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Jefferson | 19 min |
| Aug 1, 3:58 PM MDT | Special Weather Statement | BOU | Washington | 32 min |
| Aug 1, 4:06 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Washington | 24 min |
| Aug 1, 4:10 PM MDT | Special Weather Statement | BOU | Denver | 35 min |
| Aug 1, 4:19 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 26 min |
| Aug 1, 4:28 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Washington | 47 min |
| Aug 1, 5:05 PM MDT | Special Weather Statement | BOU | Boulder | 25 min |
| Aug 1, 5:13 PM MDT | Flash Flood Warning | BOU | Boulder | 3 hr |
| Aug 1, 5:15 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 30 min |
| Aug 1, 5:37 PM MDT | Areal Flood Advisory | BOU | Washington | 3 hr |
| Aug 1, 5:40 PM MDT | Special Weather Statement | BOU | Broomfield | 50 min |
| Aug 1, 5:43 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 32 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 2023Every severe thunderstorm warning in 2023
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.