Up to 2-inch hail, larger than a golf ball but smaller than a tennis ball, and 75 mph winds are expected in southeastern Colorado, according to the weather service. Localized flooding will also be possible.

Hail that’s 1 inch across or larger and winds stronger than 50 mph are considered severe weather, according to the National Severe Storms Laboratory, which is part of the same federal agency as the weather service.

The Interstate 25 corridor south of Denver is forecast to see up to 1-inch hail and 60 mph winds, forecasters said.

Storms will form in the mountains after 1 p.m. Sunday and move southeast, according to the weather service.

Separate storms will form across the Eastern Plains late Sunday afternoon and move south, forecasters said.

Thunderstorms and rain showers are possible across the Denver area on Sunday between 3 p.m. and midnight, but the severe weather forecast for the Eastern Plains isn’t likely in the city.

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Severe Thunderstorm Warning including Pueblo CO, Pueblo West CO and Blende CO until 5:00 PM MDT. This destructive storm will contain baseball sized hail! pic.twitter.com/JqBwUd9oP2

— NWS Pueblo (@NWSPueblo) June 6, 2025

The warning, in effect until 5 p.m. for Pueblo, Pueblo West and Blende, describes the storm as a life-threatening situation and urges residents to seek shelter immediately.

The storm could also bring 70 mph winds and possibly a tornado.

Update 3:54 p.m.: A tornado warning was issued for Ellicott and Yoder in El Paso County after radar indicated a twister had formed, according to the National Weather Service’s Pueblo office.

The warning is in effect until 4:15 p.m.

Tornado Warning continues for Ellicott CO and Yoder CO until 4:15 PM MDT pic.twitter.com/rYmHb6IEM1

— NWS Pueblo (@NWSPueblo) June 6, 2025

The area also is under a severe thunderstorm warning in effect until 4:15 p.m. The storm could bring winds of up to 60 mph and half-dollar-sized hail, the alert stated.

Severe Thunderstorm Warning continues for Security CO and Ellicott CO until 4:15 PM MDT pic.twitter.com/5vp5VqGQUd

— NWS Pueblo (@NWSPueblo) June 6, 2025

Update 2 p.m.: A tornado watch is in effect for most Colorado counties south of Interstate 70 and east of the Interstate 25 corridor, according to the National Weather Service.

The severe weather watch lasts until 9 p.m. for Arapahoe, Douglas, El Paso, Pueblo, Baca, Bent, Cheyenne, Crowley, Elbert, Fremont, Huerfano, Kiowa, Kit Carson, Las Animas, Lincoln, Otero, Prowers, Teller and Washington counties.

A tornado watch has been issued for parts of Colorado until 9 PM MDT pic.twitter.com/xjAAzpiCQf

— NWS Boulder (@NWSBoulder) June 6, 2025

Original story: Another wave of severe thunderstorms could bring apple-sized hail, wind gusts up to 80 mph and tornadoes to parts of the Front Range and Eastern Plains, forecasters said Friday.

Hundreds of DIA flights delayed as thunderstorms, hail hit Colorado’s Front Range

Communities east of the Interstate 25 corridor and south of Interstate 70 are most likely to see the biggest impact from storms starting at around 2 p.m. and lasting into the evening, according to the National Weather Service.

“... All modes of severe weather will be possible,” including flash flooding in urban areas and burn scars if stronger storms linger over those areas, officials with the NWS Pueblo office wrote in a hazardous weather outlook.

Storms will start to dissipate along the I-25 corridor after 7 p.m. and on the Eastern Plains around 12 a.m.

Northeast and north central Colorado may see winds up to 70 mph and egg-sized hail, NWS Boulder forecasters said.

This is a developing story and may be updated.

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Parts of the two counties fell under a flash flood warning Thursday afternoon. Residents of Castle Rock, Franktown and Elizabeth were advised by the National Weather Service to prepare to move to higher ground and avoid driving through flooding.

The city of Colorado Springs also posted a video on social media at 5:29 p.m. that showed North Cheyenne Creek rushing under a section of North Cheyenne Canyon Road in the southwest area of the city.

The city said in the post that both gates into North Cheyenne Cañon Park are closed while the city works to repair the road. Gold Camp Road is also closed to the public but accessible to nearby residents.

Fog and rain are forecast Friday morning in Denver, with clouds likely burning off Saturday and returning Sunday. No local flooding was forecast by the agency Friday.

The FAA issued the ground stop at DIA at 7 a.m. for “low ceilings,” which refers to the lowest level of cloud cover, according to the agency’s website. The ground stop lasted through 8:15 a.m. Thursday, but delays and traffic control programs continued.

As of 6:30 p.m., 1,005 flights had been delayed at DIA and 11 had been canceled, according to flight tracking software FlightAware.

Flights are delayed by more than two hours on average because of thunderstorms, FAA officials said.

Colorado weather: Large hail, tornadoes possible during afternoon thunderstorms

Southwest delayed 323 of those flights, 224 from SkyWest, 283 from United and 66 from Frontier Airlines.

Delta, Key Lime Air, Alaska Airlines, American Airlines, Air Canada, Volaris, WestJet, AeroMéxico, Lufthansa, Aer Lingus and Icelandair all delayed between one and 30 flights.

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The warning, in effect until 6:45 p.m., warns residents of Castle Rock, Franktown, Elizabeth and nearby areas to move immediately to higher ground and to avoid walking or driving through flood waters.

Rain prompts flood warnings, washes out road into Colorado Springs park

Updated 3:31 p.m.: Radar has indicated a tornado in Washington County, according to a warning from the National Weather Service's Boulder office.

The tornado warning, in effect until 4 p.m., also indicates that baseball-sized hail is possible.

Updated 2:40 p.m.: The severe thunderstorm warning for Fort Morgan has been extended until 3:15 p.m. Two-inch hail and winds of up to 50 mph are still possible.

Updated 2:29 p.m.: Fort Morgan and Log Lane Village could see two-inch hail from a thunderstorm passing through Morgan County.

In a severe thunderstorm warning in effect until 2:45 p.m., the National Weather Service's Boulder office warns of winds of up to 50 mph in addition to the hail.

A special weather statement from the agency also warned of penny-sized hail and 50 mph winds around the Denver International Airport and Watkins. The statement is in effect until 3:15 p.m.

Over 1,000 flights delayed at Denver International Airport amid ground stop, weather

Updated 2 p.m.: Most of metro Denver, the Front Range and Eastern Plains are under a severe thunderstorm watch until 8 p.m., National Weather Service forecasters said Thursday.

The severe weather watch covers most of Colorado along the Interstate 25 corridor and to the east, including Denver, Adams, Arapahoe, Douglas, El Paso, Elbert, Weld, Cheyenne, Crowley, Kit Carson, Las Animas, Lincoln, Logan, Morgan, Otero, Pueblo, Washington and Yuma counties.

Thunderstorms could bring several tornadoes, scattered egg-sized hail and gusts up to 70 mph, forecasters said.

The southeast corner of Colorado is also under a tornado watch, with tennis-ball-sized hail and winds up to 75 mph possible in Baca, Bent, Kiowa and Prowers counties.

This is a developing story and may be updated.

Original story: Large hail, damaging winds and tornadoes will be possible during Thursday afternoon storms over the Eastern Plains and Interstate 25 corridor, according to the National Weather Service.

Thunderstorms will start over the mountains midday and push onto the Eastern Plains by Thursday afternoon or evening, according to the weather service.

Forecasters said up to 2-inch hail and 70 mph winds are forecasted, especially in southeastern Colorado.

Hail at least 1 inch in diameter and non-tornado winds stronger than 50 mph are considered severe and damaging, according to the National Severe Storms Laboratory, which is part of the same federal agency as the weather service.

The strongest chance for severe weather in southeastern Colorado falls between 4 p.m. and 11 p.m., forecasters said.

There is a medium risk of tornadoes and localized flooding, forecasters said.

Denver is forecast to see small hail and gusty winds during Thursday afternoon's storms, according to the weather service.

The best chance for storms in and around the city will be between 3 p.m. and 9 p.m., but rainy weather could continue after midnight, forecasters said.

Severe thunderstorms will be possible again Friday afternoon and evening east of the I-25 corridor, according to a hazardous weather outlook from the weather service's Pueblo office.

Fewer storms are expected over the weekend as the weather pattern weakens, but there will be another chance for severe thunderstorms early next week, according to the outlook.

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Miller moths, infamous in Denver for their large numbers and ability to find their way into homes, are critical for Colorado’s environment, Butterfly Pavilion lepidopterist and entomologist Shiran Hershcovich said.

As they travel from one plant to the next, transferring pollen while following the blooms across the state, moths help sustain Colorado’s environment, Hershcovich said.

“As they come into our spaces, just approach them with curiosity and respect,” she said. “They’re not coming into our living rooms, we’ve built our home in theirs.”

When is miller moth season in Colorado?

Miller moths typically swarm across Colorado from mid-May to mid-June, Hershcovich said.

Moths metamorphose from army cutworm caterpillars on the Great Plains in March and take off for western Colorado’s mountains in late spring, making pit stops on the Front Range during their journey, according to the Colorado State University Extension.

The moths come in waves as they emerge from their cocoons, said Genevieve Anderegg, assistant collections manager of invertebrate zoology at the Denver Museum of Nature and Science.

They travel west across the state for the cooler weather and to feed on the vast pollen and nectar that Colorado’s diverse environments offer, Anderegg said. They do the same thing on the other side of the mountain, but the population is smaller and less noticeable, she said.

The number of miller moths can vary dramatically each year and is largely unpredictable, Hershcovich said.

“Even though they visit our backyards each year, we know next to nothing about them,” Hershcovich said. “They’re so essential to life as we know it, but they’ve only recently begun to gain visibility in terms of research.”

The climate and the number of flowers in bloom have the biggest impact on the moth population.

How long do miller moths live?

Miller moths live about a year — just long enough to emerge from their cocoons on the Great Plains, migrate west to Colorado’s mountains and return to the grasslands in the fall to lay their eggs, Anderegg said. That is, if they don’t die during the migration.

The moths get confused by urban lights and often end up finding their way into Colorado homes, Hershcovich said, adding that miller moths use light from celestial objects like stars and the moon to orient themselves.

Once the moths start to appear in Denver, depending on the year and weather conditions, the peak will last from two to four weeks, Hershcovich said.

How can people control the number of miller moths in their home?

To prevent miller moths from making a home inside human spaces, Coloradans should seal any obvious openings, especially around windows and doors; reduce the number of lights in and around the home; or substitute yellow lights, according to the CSU Extension.

Miller moths may concentrate around buildings with more plants and increased humidity, the CSU Extension’s article stated. This effect is seen particularly during drought years when there are fewer flowering plants at lower elevations.

If they do make it inside, residents should carry them outside in a cup or their hands, Hershcovich said.

What happens if your pet eats a moth (or several dozen)?

“Miller moths are not dangerous in any way to us, our pets or our kids,” Hershcovich said. “They’re not venomous or poisonous.”

Many animals in Colorado — including birds, lizards and bears — rely on the moth population for food and as a key source of protein, she said.

“Your cat could eat cupfuls of moths and still be safe,” she said. “Honestly, the moths have the short end of the stick on this one.”

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The statement, in effect until 6:30 p.m., warns of the possibility of a landspout and pea-sized hail in Englewood, Greenwood Village and Littleton.

Residents are advised to seek shelter in a sturdy structure.

The average daily temperature from March through May was the warmest in 13 years at 51 degrees, NWS Boulder meteorologist Bernie Meyer said.

March was 4.2 degrees above normal, April was 1.7 degrees above normal and May was just .3 degrees above normal.

March’s abnormally warm weather and lack of precipitation was largely the cause for the spring spike, Meyer said.

This was the 12th warmest March on record with an average daily temperature of 45.8 degrees and also the eighth least-snowy March, with just 2 inches of snow recorded, according to NWS.

Coloradans can look forward to more above-average temperatures this summer with a 50-60% chance of warmer-than-normal weather, Meyer said.

Rain will start falling on the Front Range and Eastern Plains at around 3 p.m., increasing to an 80% or greater chance of precipitation for communities from Longmont to Castle Rock and Breckenridge to Julesburg by 9 p.m., forecasters said Monday morning.

“A few strong to severe thunderstorms are possible this afternoon and evening, especially across the far northeast plains,” forecasters with the NWS Boulder office wrote. “Large hail and damaging wind gusts are the primary threats, but a brief tornado will also be possible.”

A severe thunderstorm watch is in place for northeast Colorado until 8 p.m., with scattered egg-sized hail, wind gusts up to 75 mph and frequent lightning possible in Weld, Logan, Morgan, Phillips, Sedgwick and Washington counties, agency officials said.

Another severe thunderstorm watch was issued for the Eastern Plains until 10 p.m., with isolated spurts of egg-sized hail, widespread wind gusts up to 85 mph and frequent lightning possible in Baca, Bent, Cheyenne, Crowley, Kiowa, Kit Carson, Otero, Prowers and Yuma counties, forecasters with the NWS Pueblo office said.

The storms could also bring heavy rainfall that could cause minor flooding, according to the agency.

More than an inch of rain is possible in some areas, including the foothills of Jefferson County and south metro Denver into the Palmer Divide, while neighborhoods north of Denver will see lighter rain.

Ping-pong-ball-size hail and winds near 70 mph are possible in southeast Colorado as the storm moves across the state, forecasters with the NWS Pueblo office said. Higher elevations could see half-inch hail and winds near 55 mph.

This is a developing story and may be updated.

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The NOAA’s Space Weather Prediction Center issued a severe, G4 geomagnetic storm watch for Sunday, the second strongest storm level on the scale.

G4 storms are rare, according to space weather officials. When strong geomagnetic storms hit Earth, the northern lights will be visible at unusually low latitudes.

However, space weather officials said this storm’s orientation has been trending north, making it less likely the lights will be as visible as they have in the past.

“Should the orientation shift south … activity could escalate quickly,” space weather officials said.

Maps released by the Space Weather Prediction Center showing the northern lights’ projected reach Sunday night include the tip of northern Colorado.

The northern lights likely won’t be seen overhead if they do appear, but could be visible on Colorado’s northern horizon after dark if the skies remain clear, space weather officials said.

For the best chance to view the aurora borealis, Coloradans should head for an area as far north as possible that’s free from light pollution.

If they watch closely, they may be able to see the green, purple and pink lights with their naked eyes, space weather officials said. Cell phone cameras can also enhance the colors and make the northern lights easier to see.

The lights’ intensity and color will vary depending on the watcher’s distance from the aurora and how strong the geomagnetic storm is.

This is a developing story and may be updated. 

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