Alert archive / Colorado / Flash Flood Warnings in 2023
Flash Flood Warning 71, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Aug 2, 2023, 11:24 PM MDT for Larimer County, Colorado. It was in force for 5 hr. 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
- Aug 2, 2023, 11:24 PM MDT (05:24 UTC)
- Expired
- Aug 3, 2023, 4:00 AM MDT
- In force
- 5 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Larimer County, CO
The radar
The Cheyenne radar (KCYS), 86 km from the middle of the area, began a volume at 05:26 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 3, 12:00 AM MDT | FLASH FLOOD | 2 E Glen Haven, CO | Water crossing County Road 43 at Streamside Drive. |
| Aug 3, 12:45 AM MDT | FLASH FLOOD | 3 Ssw Buckhorn Mountain, CO | Water and debris over County Road 44H. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this flash flood warning; the first came 36 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 00:00Z, 5.4 hours before the alert went out and 306 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
- 798 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 2314 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.9
The text
As transmitted.
849
WGUS55 KBOU 030524
FFWBOU
COC069-030815-
/O.NEW.KBOU.FF.W.0071.230803T0524Z-230803T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
1124 PM MDT Wed Aug 2 2023
The National Weather Service in Denver has issued a
* Flash Flood Warning for...
Central Larimer County in north central Colorado...
* Until 215 AM MDT.
* At 1124 PM MDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.2 and 0.5 inches of rain have fallen. Additional rainfall
amounts of 0.5 to 1 inch are possible in the warned area. Flash
flooding is ongoing or expected to begin shortly.The heaviest rain
is over the Crystal Mountain and Buckhorn Canyon areas.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar and automated gauges.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
mainly rural areas of Central Larimer County
This includes the following additional locations...
Upper Buckhorn along County Road 44H, Moondance Way, Stringtown
Gulch, Lower Buckhorn on County Road 27 above Masonville, Crystal
Mountain, The Retreat and Storm Mountain.
This includes the following streams and drainages...
Eld Creek, Sheep Creek, Buckhorn Creek, Cedar Creek, Miller Fork,
Big Thompson River, Redstone Creek, Black Creek, Pennock Creek and
North Fork Fish Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Heavy Rainfall will cause flash flooding of small creeks, streams,
and ditches in the affected part of the Cameron Peak burn area. Rock
slides or debris flows can also be expected across rural roads.
&&
LAT...LON 4055 10552 4059 10540 4055 10525 4045 10541
FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Gimmestad4 follow-up statements
911
WGUS75 KBOU 030636
FFSBOU
Flash Flood Statement
National Weather Service Denver CO
1236 AM MDT Thu Aug 3 2023
COC069-030815-
/O.CON.KBOU.FF.W.0071.000000T0000Z-230803T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Larimer CO-
1236 AM MDT Thu Aug 3 2023
...FLASH FLOOD WARNING FOR THE CAMERON PEAK BURN SCAR REMAINS IN
EFFECT UNTIL 215 AM MDT EARLY THIS MORNING FOR CENTRAL LARIMER
COUNTY...
At 1236 AM MDT, emergency management reported that flash flooding
was occurring over portions of the Cameron Peak Burn Scar. Between
0.5 and 1 inch of rain has fallen. Additional rainfall amounts up to
0.5 inches are possible in the warned area. Flash flooding is
occurring along the lower part of County Road 44H in Buckhorn Canyon
and on County Road 43 at Streamside Road east of Glen Haven.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding in and around the Cameron Peak Burn Scar.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of areas in and around
the Cameron Peak Burn Scar.
Some locations that will experience flash flooding include...
mainly rural areas of Central Larimer County
This includes the following additional locations...
Upper Buckhorn along County Road 44H, Moondance Way, Stringtown
Gulch, Lower Buckhorn on County Road 27 above Masonville, Crystal
Mountain, The Retreat and Storm Mountain.
This includes the following streams and drainages...
Eld Creek, Sheep Creek, Buckhorn Creek, Cedar Creek, Miller Fork,
Redstone Creek, Black Creek, Pennock Creek and North Fork Fish
Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Heavy Rainfall will cause flash flooding of small creeks, streams,
and ditches in the affected part of the Cameron Peak burn area. Rock
slides or debris flows can also be expected across rural roads.
&&
LAT...LON 4055 10552 4059 10540 4055 10525 4045 10541
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Gimmestad023
WGUS55 KBOU 030734
FFWBOU
COC069-031000-
/O.EXT.KBOU.FF.W.0071.000000T0000Z-230803T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
134 AM MDT Thu Aug 3 2023
The National Weather Service in Denver has extended the
* Flash Flood Warning for...
The Cameron Peak burn scar in...
Central Larimer County in north central Colorado...
* Until 400 AM MDT.
* At 134 AM MDT, emergency management reported that flash flooding
was occurring over portions of the Cameron Peak Burn Scar. Between
0.5 and 1.5 inches of rain has fallen. Additional rainfall amounts
up to 0.3 inches are possible in the warned area. Flash flooding
is occurring along the lower part of County Road 44H in Buckhorn
Canyon and on County Road 43 at Streamside Road east of Glen
Haven. These roads are closed and evacuations are occurring in
these areas.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding in and around the Cameron
Peak Burn Scar.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of areas in and around
the Cameron Peak Burn Scar.
* Some locations that will experience flash flooding include...
mainly rural areas of Central Larimer County
This includes the following additional locations...
Upper Buckhorn along County Road 44H, Moondance Way, Stringtown
Gulch, Lower Buckhorn on County Road 27 above Masonville, Crystal
Mountain, The Retreat and Storm Mountain.
This includes the following streams and drainages...
Eld Creek, Sheep Creek, Buckhorn Creek, Cedar Creek, Miller Fork,
Big Thompson River, Redstone Creek, Black Creek, Pennock Creek and
North Fork Fish Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Heavy Rainfall will cause flash flooding of small creeks, streams,
and ditches in the affected part of the Cameron Peak burn area. Rock
slides or debris flows can also be expected across rural roads.
&&
LAT...LON 4055 10552 4059 10540 4055 10525 4045 10541
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Gimmestad243
WGUS75 KBOU 030851
FFSBOU
Flash Flood Statement
National Weather Service Denver CO
251 AM MDT Thu Aug 3 2023
COC069-031000-
/O.CON.KBOU.FF.W.0071.000000T0000Z-230803T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Larimer CO-
251 AM MDT Thu Aug 3 2023
...FLASH FLOOD WARNING FOR THE CAMERON PEAK BURN SCAR REMAINS IN
EFFECT UNTIL 4 AM MDT EARLY THIS MORNING FOR CENTRAL LARIMER
COUNTY...
At 251 AM MDT, emergency management reported flooding from earlier
thunderstorms over parts of the Cameron Peak Burn Scar. Between 0.5
and 1.5 inches of rain have fallen. Flash flooding was continuing on
Buckhorn Creek in the lower canyon along County Road 44H and on the
Miller Fork in The Retreat east of Glen Haven. Runoff was peaking or
beginning to diminish in these areas.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding in and around the Cameron Peak Burn Scar.
SOURCE...Emergency management reported.
IMPACT...Life threatening flash flooding of areas in and around
the Cameron Peak Burn Scar.
Some locations that will experience flash flooding include...
mainly rural areas of Central Larimer County
This includes the following additional locations...
Upper Buckhorn along County Road 44H, Moondance Way, Stringtown
Gulch, Lower Buckhorn on County Road 27 above Masonville, Crystal
Mountain, The Retreat and Storm Mountain.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding. Check with local officials including Larimer
County OEM for current details about road closures and evacuation
orders.
&&
LAT...LON 4055 10552 4059 10540 4055 10525 4045 10541
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Gimmestad709 WGUS75 KBOU 030956 FFSBOU Flash Flood Statement National Weather Service Denver CO 356 AM MDT Thu Aug 3 2023 COC069-031006- /O.EXP.KBOU.FF.W.0071.000000T0000Z-230803T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Larimer CO- 356 AM MDT Thu Aug 3 2023 ...FLASH FLOOD WARNING FOR THE CAMERON PEAK BURN SCAR WILL EXPIRE AT 4 AM MDT EARLY THIS MORNING FOR CENTRAL LARIMER COUNTY... Flood waters have receded. The heavy rain has ended. Flooding is no longer expected to pose a threat. The Buckhorn Road, County Road 44H, remains closed west of Stove Prairie road due to flood damage. Other less traveled roads in the areas of Buckhorn Canyon, Crystal Mountain, and east of Glen Haven likely have significant erosion. Please continue to heed remaining road closures and use caution if traveling in these areas. LAT...LON 4055 10552 4059 10540 4055 10525 4045 10541 $$ Gimmestad
What forecasters said that day
The local office's own words before this flash flood 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 flash flood warning went out at Aug 2, 9:35 PM MDT, 1 hour 49 minutes earlier.
Area forecast discussion, Aug 2, 9:35 PM MDT, 1 hour 49 minutes before
Area Forecast Discussion National Weather Service Denver/Boulder CO 935 PM MDT Wed Aug 2 2023 .UPDATE... Issued at 934 PM MDT Wed Aug 2 2023 An area of strong thunderstorms with heavy rain and pretty high winds are pushing northeastward across the Greater Denver and Palmer Ridge areas at this time. Increased the pops in the GFE grids appropriately. There is some convection upstream over the southwestern CWA and quite a bit more over the west slope of Colorado. The high resolution models show another batch of convection to move across the forecast after 06Z tonight. The trajectory of the real data suggests this convection will affect mainly the northwesterly CWA. We'll see. Will adjust sky, wind and pop grids. && .SHORT TERM...(This evening through Thursday) Issued at 303 PM MDT Wed Aug 2 2023 Showers and storms have formed this afternoon mainly over the higher terrain and the far northeast corner of the state by Sterling and Fort Morgan. The SPC mesoanalysis shows 1,500-2,000 j/kg of mixed layer CAPE over the northeast corner which is plenty of instability for strong updrafts to form. Deep layer shear is around 20-25 knots which is too weak for an organized severe storm threat. However, some storms will have strong pulses that could reach severe limits with large hail and damaging wind gusts possible. The threat for severe storms will mainly be north and east of a line from Fort Morgan to Last Chance. Farther west, there is less instability and storms have been weaker. They are producing brief heavy rain and pose a limited threat of flash flooding in the recent burn areas. Otherwise, temperatures are slightly below normal today with decent moisture in the air. There is an area of mid level moisture showing up on water vapor in southwest Colorado that will move over our forecast area later tonight. This may create some showers and weak storms that last after midnight tonight and a mention of showers and storms were kept in the forecast throughout the night and into the morning hours tomorrow. Otherwise, temperatures will be near normal tonight with mostly cloudy skies. A shortwave trough seen on water vapor imagery currently over western Utah and northwest Arizona will move over our forecast area Thursday afternoon. This trough will provide good forcing which will lead to better coverage of storms especially over the eastern plains. Better flow aloft along with lee cyclogenesis increasing low level winds towards the surface will lead to increased deep layer shear with surface to 6km values near 40 knots across northeast Colorado. In addition, there will be increased instability as better surface moisture will be in place with slight cooling of temperatures aloft. High resolution models suggest mixed layer CAPE values upwards of 2,500 j/kg over the far northeast corner which is ample instability. The combination of strong forcing, high instability values, and moderate shear will lead to numerous strong to severe storms in the northeast corner. We are in agreement with the enhanced risk for severe storms put out by SPC and there may be a need to expand the coverage of the enhanced risk farther west into our CWA. The primary threats will be large hail and damaging winds so a Severe Thunderstorm Watch will likely be needed tomorrow. Model soundings suggest that just before sunset, an enhanced low level jet may increase the "hump" in the hodographs (increased low level SRH) which could lead to a brief supercell tornado threat mainly east of a line from Sterling to Akron. However, the broader tornado threat is low due to small values of low level shear. These strong storms will also produce heavy rainfall and will pose a flash flood threat. Considering the heavy rain would be falling on wet soil, a Flood Watch for flash flooding will likely be needed for Washington, Logan, Phillips, and Sedgwick Counties. .LONG TERM...(Thursday night through Wednesday) Issued at 303 PM MDT Wed Aug 2 2023 There is general agreement for a flat ridge to remain over the region through the extended period with a few shortwave troughs moving through the flow aloft. Friday, there is weak subsidence aloft which will result in subtle drying. Daytime heating will allow instability to build through the day with MLCAPE values in the 600- 1500 J/kg. This will be enough to support isolated to scattered afternoon showers and thunderstorms. A quick moving disturbance brushes across the northeast corner in the afternoon which will provide better chances for the east plains. Most guidance progs a cold front to move through Colorado on Saturday with some uncertainty in the timing. This may have some impact to the convective potential that afternoon. There will be sufficient upper level support with a westerly upper level jet moving in and a shortwave dropping across the northeast corner. MLCAPE values rise into the 400-800 J/kg range for the high country and 800-1800 J/kg eastward. With a jet aloft, 0-6km bulk shear 45-55 kts will favor the potential for some strong to severe storms. Sunday and into early next week, ensemble guidance shows an increase in moisture over mainly the lower elevations. The ridge aloft weakens slightly as a trough strengthens to the east resulting in generally cooler temperatures aloft. Some solutions could bring highs as low as upper 70s for portions of the plains. A few disturbances move through the flow during this period, resulting in chances for afternoon showers/storms. && .AVIATION...(For the 06Z TAFS through 06Z Thursday night) Issued at 935 PM MDT Wed Aug 2 2023 Will keep the TEMPO group for TSRA and VRB20G40KT and BKN050 going through 05Z at DIA with the convection going through the area now. Will leave a VCSH in overnight based of current radar and model data. There shouldn't be any ceiling issues after 06Z. && .HYDROLOGY... Issued at 303 PM MDT Wed Aug 2 2023 Showers and storms currently over the recent burn areas are producing brief heavy rain. It is possible a couple flood advisories will be issued for either the Cameron Peak or east Troublesome burn areas. It is unlikely a Flash Flood Warning will be issued today but it is possible given a strong storm in the wrong location. Scattered storms will be possible again tomorrow over the burn areas. There will be near to slightly above normal precipitable water so storms will produce heavy rainfall. With a shortwave aloft and strong flow aloft, storms will be moving faster tomorrow compared to the last few days. Therefore, a limited threat of burn area flash flooding will exist. There is a low threat for flash flooding over the burn areas Friday and through the weekend. Moisture and instability will be sufficient to support afternoon scattered showers and thunderstorms. The threat will be limited because storm motions will be trending quicker. Still can't rule out the threat for impacts on the burn areas if storms track over those areas. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && UPDATE.......RJK SHORT TERM...Danielson LONG TERM....Mensch AVIATION.....RJK HYDROLOGY....Danielson/Mensch
Hazardous weather outlook, Aug 2, 6:10 PM MDT, 5 hours 14 minutes before
Outdoor Activities Forecast National Weather Service Denver/Boulder CO 610 PM MDT Wed Aug 2 2023 IT WILL REMAIN UNSETTLED THROUGH MUCH OF THE PERIOD WITH A CHANCE OF MAINLY AFTERNOON AND EVENING THUNDERSTORMS THROUGH THE PERIOD. AS A RESULT, TEMPERATURES ARE EXPECTED TO RUN ON THE COOLER SIDE, GENERALLY BELOW SEASONAL NORMALS. ...The forecast for the central Colorado mountains east of Vail Pass... .TONIGHT...Mostly cloudy. Chance of thunderstorms in the evening, then a chance of showers and slight chance of thunderstorms after midnight. Lows in the mid 40s. Chance of rain 50 percent. .THURSDAY...Partly cloudy with a slight chance of thunderstorms in the morning, then mostly cloudy with a chance of thunderstorms in the afternoon. Highs in the upper 60s. West winds 10 to 20 mph with gusts up to 30 mph. Chance of precipitation 50 percent. .THURSDAY NIGHT...Mostly cloudy with a slight chance of thunderstorms in the evening, then partly cloudy after midnight. Lows in the mid 40s. West winds 10 to 15 mph with gusts up to 25 mph in the evening, becoming light. Chance of precipitation 20 percent. .FRIDAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs in the mid 60s. West winds 10 to 20 mph with gusts up to 30 mph. .FRIDAY NIGHT...Mostly clear with a 10 percent chance of thunderstorms. Lows in the mid 40s. ...Looking further ahead for the mountain areas... .SATURDAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs in the upper 60s. .SATURDAY NIGHT...Partly cloudy with a 20 percent chance of thunderstorms. Lows in the lower 40s. .SUNDAY THROUGH MONDAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs in the mid 60s. Lows in the lower 40s. .MONDAY NIGHT...Partly cloudy with a chance of rain showers and slight chance of thunderstorms. Lows in the lower 40s. Chance of rain 40 percent. .TUESDAY...Partly cloudy with a 40 percent chance of thunderstorms. Highs in the mid 60s. .TUESDAY NIGHT...Mostly clear with a 10 percent chance of thunderstorms. Lows in the lower 40s. .WEDNESDAY...Partly cloudy with a 20 percent chance of thunderstorms. Highs in the upper 60s. The ultraviolet index for Denver on Thursday is a 11 which is in the extreme category. The forecast weather and high temperature for Thursday at a few cities around the country... Seattle...Sunny and 84. San Francisco...Mostly Cloudy and 63. Los Angeles...Sunny and 75. Salt Lake City...Thunderstorms and 86. Las Vegas...Sunny and 103. Chicago...Partly Cloudy and 87. Dallas...Very hot and 106. Boston...Sunny and 80. New York City...Partly Cloudy and 80. Washington DC...Partly Cloudy and 87. Atlanta...Thunderstorms and 87. Miami...Thunderstorms and 91.
In the hours before
Special weather statement, Aug 2, 9:32 PM MDT, 1 hour 52 minutes before
Special Weather Statement
National Weather Service Denver CO
932 PM MDT Wed Aug 2 2023
COZ046-047-030415-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-
Southeast Elbert County Below 6000 Feet/South Lincoln County CO-
932 PM MDT Wed Aug 2 2023
...Strong thunderstorms will impact portions of southeastern Elbert
and southeastern Lincoln Counties through 1015 PM MDT...
At 930 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles southeast of Matheson to 5 miles south
of Punkin Center to 10 miles south of Forder, or along a line
extending from 16 miles southwest of Limon to 73 miles west of
Cheyenne Wells to 37 miles north of North La Junta. Movement was east
at 25 mph.
HAZARD...Wind gusts of 50 to 55 mph and pea 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...
Hugo, Genoa, Boyero, Karval, Punkin Center, Kutch, Wild Horse Point
and Forder.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare for sudden gusty winds. Secure loose objects and move to a
safe shelter inside a building or vehicle. The strong winds will
arrive well ahead of the storms.
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3852 10379 3875 10379 3903 10393 3905 10390
3906 10393 3907 10391 3908 10393 3908 10391
3909 10392 3910 10389 3913 10389 3913 10397
3915 10389 3916 10388 3930 10341 3885 10319
3853 10321
TIME...MOT...LOC 0330Z 257DEG 22KT 3908 10387 3877 10372 3853 10373
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH
BARJENBRUCHLocal storm report, Aug 2, 9:57 PM MDT, 1 hour 27 minutes before
Preliminary Local Storm Report
National Weather Service Denver CO
957 PM MDT Wed Aug 2 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0953 PM Hail 2 ESE Erie 40.02N 105.02W
08/02/2023 M0.88 inch Weld CO Public
Report via social media.
&&Special weather statement, Aug 2, 10:13 PM MDT, 1 hour 11 minutes before
Special Weather Statement
National Weather Service Denver CO
1013 PM MDT Wed Aug 2 2023
COZ046-047-030500-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-
Southeast Elbert County Below 6000 Feet/South Lincoln County CO-
1013 PM MDT Wed Aug 2 2023
...Strong thunderstorms will impact portions of east central Elbert
and northeastern Lincoln Counties through 1100 PM MDT...
At 1012 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Limon to near Hugo to 9 miles west of
Boyero. Movement was northeast at 25 mph.
HAZARD...Wind gusts up to 50 mph and pea 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...
Limon, Hugo, Arriba and Genoa.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare for sudden gusty winds. Secure loose objects and move to a
safe shelter inside a building or vehicle. The strong, gusty winds
will arrive ahead of the actual storms.
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3893 10355 3928 10381 3957 10348 3957 10333
3942 10315 3898 10316
TIME...MOT...LOC 0412Z 232DEG 21KT 3930 10368 3916 10351 3896 10344
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
BARJENBRUCHSpecial weather statement, Aug 2, 10:14 PM MDT, 1 hour 10 minutes before
Special Weather Statement
National Weather Service Denver CO
1014 PM MDT Wed Aug 2 2023
COZ039-043-030500-
Central and South Weld County CO-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County
CO-
1014 PM MDT Wed Aug 2 2023
...A strong thunderstorm will impact portions of western Weld and
northeastern Boulder Counties through 1100 PM MDT...
At 1014 PM MDT, Doppler radar was tracking a strong thunderstorm near
Frederick, or 25 miles southwest of Greeley, moving north at 15 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...
Longmont, Firestone, Frederick, Berthoud, Dacono and Mead.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4007 10494 4009 10511 4026 10515 4026 10506
4030 10506 4031 10489
TIME...MOT...LOC 0414Z 168DEG 15KT 4013 10503
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH
ENTREKINLocal storm report, Aug 2, 10:50 PM MDT, 34 minutes before
Preliminary Local Storm Report...Summary
National Weather Service Denver CO
1050 PM MDT Wed Aug 2 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1035 PM Tstm Wnd Gst 1 SSE Agate 39.46N 103.94W
08/02/2023 M52 MPH Elbert CO Mesonet
Mesonet station UP693 Agate.
1030 PM Tstm Wnd Gst 7 SSW Hugo 39.04N 103.52W
08/02/2023 M52 MPH Lincoln CO Mesonet
Mesonet station EW9214 Hugo.
1025 PM Tstm Wnd Gst Hugo 39.14N 103.47W
08/02/2023 M51 MPH Lincoln CO Mesonet
Mesonet station EW0539 Hugo.
0953 PM Hail 2 ESE Erie 40.02N 105.02W
08/02/2023 M0.88 inch Weld CO Public
Report via social media.
0925 PM Tstm Wnd Gst 2 SE Denver Intl Airpor 39.85N 104.65W
08/02/2023 M46 MPH Denver CO ASOS
ASOS station KDEN Denver Intl Airport.
0902 PM Tstm Wnd Gst 1 N Buckley AFB 39.72N 104.75W
08/02/2023 M46 MPH Arapahoe CO AWOS
AWOS station KBKF Buckley SFB.
0842 PM Tstm Wnd Gst 1 ESE Greenwood Village 39.61N 104.89W
08/02/2023 M48 MPH Arapahoe CO Mesonet
Mesonet station CO186 Greenwood Village
I-25/Orchard Rd.
0832 PM Non-Tstm Wnd Gst 1 NNE Lone Tree 39.56N 104.87W
08/02/2023 M49 MPH Douglas CO Mesonet
Mesonet station CO001 I-25 and C470.
0820 PM Tstm Wnd Gst 3 NNW Louviers 39.51N 105.02W
08/02/2023 M47 MPH Douglas CO Mesonet
Mesonet station AT112 Littleton.
&&Special weather statement, Aug 2, 10:55 PM MDT, 29 minutes before
Special Weather Statement
National Weather Service Denver CO
1055 PM MDT Wed Aug 2 2023
COZ046-047-049-030545-
Washington County CO-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-
Southeast Elbert County Below 6000 Feet/South Lincoln County CO-
1055 PM MDT Wed Aug 2 2023
...Strong thunderstorms will impact portions of east central Elbert,
southern Washington and northeastern Lincoln Counties through 1145 PM
MDT...
At 1053 PM MDT, Doppler radar was tracking gusty outflow winds from
strong thunderstorms along a line extending from 15 miles north of
Genoa to 5 miles north of Arriba to 9 miles south of Flagler, or
along a line extending from 18 miles northeast of Limon to 14 miles
southwest of Seibert. Movement was northeast at 30 mph.
HAZARD...Wind gusts up to 50 mph and half inch 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...
Limon, Hugo, Arriba, Genoa, Thurman, Arickaree School, Anton, Woodlin
School, Lindon and Last Chance.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare for sudden gusty winds. Secure loose objects and move to a
safe shelter inside a building or vehicle. The strong winds will
occur well ahead of the arrival of the rain.
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3916 10363 3944 10389 3950 10372 3967 10370
3994 10331 3973 10292 3961 10280 3957 10281
3957 10316 3892 10317
TIME...MOT...LOC 0453Z 217DEG 26KT 3950 10352 3937 10328 3915 10306
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
BARJENBRUCHThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 6:32 PM MDT | Special Weather Statement | BOU | Teller | 43 min |
| Aug 2, 7:58 PM MDT | Special Weather Statement | BOU | Douglas | 47 min |
| Aug 2, 8:18 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver, Douglas, Elbert, Jefferson | 42 min |
| Aug 2, 8:34 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 41 min |
| Aug 2, 8:56 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver, Elbert, Weld | 28 min |
| Aug 2, 9:32 PM MDT | Special Weather Statement | BOU | Lincoln | 43 min |
| Aug 2, 9:52 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 23 min |
| Aug 2, 10:03 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 27 min |
| Aug 2, 10:13 PM MDT | Special Weather Statement | BOU | Lincoln | 47 min |
| Aug 2, 10:14 PM MDT | Special Weather Statement | BOU | Broomfield | 46 min |
| Aug 2, 10:32 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 43 min |
| Aug 2, 10:55 PM MDT | Special Weather Statement | BOU | Lincoln | 50 min |
| Aug 2, 11:03 PM MDT | Areal Flood Advisory | BOU | Larimer | 21 min |
| Aug 2, 11:57 PM MDT | Special Weather Statement | BOU | Washington | 48 min |
| Aug 3, 3:01 PM MDT | Special Weather Statement | BOU | Larimer | 44 min |
| Aug 3, 3:20 PM MDT | Special Weather Statement | BOU | Denver | 40 min |
| Aug 3, 3:23 PM MDT | Special Weather Statement | BOU | Douglas | 52 min |
| Aug 3, 3:34 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver | 41 min |
| Aug 3, 3:36 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 39 min |
| Aug 3, 3:59 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 46 min |
| Aug 3, 4:02 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 43 min |
| Aug 3, 4:24 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 51 min |
| Aug 3, 4:29 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 46 min |
| Aug 3, 4:45 PM MDT | Special Weather Statement | BOU | Elbert | 45 min |
| Aug 3, 4:46 PM MDT | Special Weather Statement | BOU | Weld | 44 min |
| Aug 3, 4:54 PM MDT | Areal Flood Advisory | BOU | Larimer | 3 hr |
| Aug 3, 4:54 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 51 min |
| Aug 3, 4:57 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 48 min |
| Aug 3, 5:00 PM MDT | Special Weather Statement | BOU | Weld | 45 min |
| Aug 3, 5:11 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 34 min |
| Aug 3, 5:17 PM MDT | Flash Flood Warning | BOU | Larimer | 104 min |
| Aug 3, 5:26 PM MDT | Special Weather Statement | BOU | Denver | 49 min |
| Aug 3, 5:40 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 50 min |
| Aug 3, 5:43 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 47 min |
| Aug 3, 5:48 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 42 min |
Nearby
Flash Flood Warnings in Colorado, 2023Every flash flood 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.