Thornton, Colorado, USA
UpdatedThu, 19-Jan-2017 6:35pm MST 


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Thornton’s Thursday offers pleasant temps, slight chance for storms

Thursday, September 15th, 2016 5:00am MST

A good looking Thursday in store for us. Temperatures will be close to normal today with a good bit of sun, perhaps a late thunderstorm.

We start out the day with mostly sunny skies then will see cloud coverage increase by late morning into the afternoon. Thunderstorm activity is expected to be primarily well north of us but we can’t rule out an isolate cell moving across the area after about 2:00pm.

In terms of temperatures, we start out cool but will be warming up nicely with readings close to the average for the date of 79 degrees.

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Warmer temps, better chance for storms Wednesday

Wednesday, September 14th, 2016 5:13am MST

The showers skipped right over us yesterday but today offers a bit better chance to see some activity and temperatures will be warming back up getting close to normal.

We still see a good bit of moisture aloft and that will be reflected in the cloud cover today. Mostly cloudy to cloudy skies start things off then we will see a bit of a break up in them later in the morning.

Temperatures today start out cool but will then be climbing to a high in the mid-70s.

Showers and thunderstorms are expected to begin to develop around noon with Thornton seeing its best chance for activity from about 3:00pm through 8:00pm. Use our interactive radar to keep an eye on the sky.

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Moon Phases Affect Earthquakes, Study Says

Wednesday, September 14th, 2016 4:19am MST

What causes earthquakes? Seismologists and other scientists have been trying to understand the geological phenomenon for centuries in a bid to come up with some sort of an effective early warning system that could save many lives. And while our understanding of earthquakes is still relatively poor, a new study links the intensity of quakes to… » Click here to read the rest of Moon Phases Affect Earthquakes, Study Says

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Japanese Volcano ‘25 Years Away’ from Major Eruption

Tuesday, September 13th, 2016 6:13pm MST

Scientists are warning that one of Japan’s most active volcanoes could erupt within the next 30 years due to a buildup of magma, the BBC reports. The Sakurajima volcano is situated on Japan’s Kyushu island, only 49km from a nuclear plant and not far from the city of Kagoshima. A report by experts from the U.K.’s… » Click here to read the rest of Japanese Volcano ‘25 Years Away’ from Major Eruption

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Japan, Taiwain, Hong Kong In Path Of Monster Tropical Cyclone

Tuesday, September 13th, 2016 12:15pm MST

Taiwan and mainland China were in the path of a monster tropical cyclone Tuesday night that was expected to bring heavy rains and gusts of up to 225 mph. The massive Super Typhoon Meranti grew from a Category 1 equivalent storm to a top-scale Category 5 seemingly overnight, bringing winds of 185 mph barreling toward the… » Click here to read the rest of Japan, Taiwain, Hong Kong In Path Of Monster Tropical Cyclone

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Thornton’s Tuesday brings a taste of fall

Tuesday, September 13th, 2016 5:01am MST

The official start to autumn is still more than a week away but that close proximity will be felt in our weather today. Overcast skies, cool temperatures and damp conditions will definitely make us aware the change in seasons is coming.

Overnight last night we received 0.03 inches of precipitation. Not much at all but enough to dampen things up. Throughout the day today we do stand a slight chance for some more sprinkles or light showers although it won’t be amounting to much if any.

Overhead we will have a healthy dose of cloud cover with just a bit of a break by late morning into the afternoon. Temperatures will be topping out in the mid to upper 60s, well below the 80 degree average for the date.

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North Korea Floods Kill 133, Displace 107,000: U.N.

Monday, September 12th, 2016 10:18am MST

More than 130 people have died and 107,000 have been forced to flee their homes in North Korea after flooding near the border with China and Russia, according to the United Nations. Flooding of the Tumen River in the country’s northeast has killed 133 people and left 395 missing, said a U.N. statement dated Sunday, AFP… » Click here to read the rest of North Korea Floods Kill 133, Displace 107,000: U.N.

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Cold front to bring cooler temps, breezy winds

Monday, September 12th, 2016 5:19am MST

A cold front is working its way into the state and as it does, we will see some notable changes to our weather. Temperatures will be a good bit cooler today and we also will get a dose of wind and a slight chance for storms.

We start out the day with mostly sunny skies. By mid-morning we will start to see a bit of an increase in cloud cover with partly sunny skies above in the afternoon and evening.

Temperatures today are going to be topping out in the mid-70s, far below yesterday’s 90 degree reading and a good way below the average of 80 degrees for the date.

As the front pushes through we are going to see an increase in winds that will last much of the day. Gusts to 25mph or so will be seen. From about noon onward we will have a slight chance for showers and thunderstorms as the atmosphere destabilizes a bit.

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September 11 to September 17: This Week in Denver Weather History

Sunday, September 11th, 2016 1:03pm MST
This Week In Denver Weather History

September 11 to September 17: This Week in Denver Weather History

Severe weather is less common as we enter the fall season but it is not entirely unheard of. As we see in our look back at this week in Denver weather history, we have seen everything ranging from torrential rains to tornadoes and even heavy snow.


In 1910…west winds were sustained to 42 mph.

In 1951…a vigorous Canadian cold front produced a dust storm across metro Denver. Northeast wind gusts to 43 mph reduced the visibility at Stapleton Airport to as low as 1 1/2 miles for nearly 5 hours. The temperature dropped 47 degrees in 8 hours…from a high of 92 degrees to a low of 45 degrees.

In 1967…a microburst wind gust to 52 mph produced blowing dust and briefly reduced the visibility to 1/2 mile at Stapleton International Airport.

In 1974…a trace of snow…the first of the season…ended the shortest period without snow…94 days from June 9th through September 10th. A trace of snow also fell on June 8th.

In 1995…strong post-frontal winds associated with a fast moving pacific cold front knocked down power poles and trees as it moved through metro Denver. Numerous power outages affected nearly one thousand people in Denver and Jefferson counties. West winds gusted to 34 mph at Denver International Airport.


In 2013…a deep southerly flow over Colorado… Ahead of a nearly stationary low pressure system over the great basin… Pumped copious amounts of monsoonal moisture into the area. In addition…a weak stationary front stretched along the Front Range foothills and Palmer Divide.  This resulted in a prolonged period of moderate to heavy rain across the Front Range foothills…Palmer Divide…urban corridor. By the 14th…storm totals ranged from 6 to 18 inches… Highest in the foothills of Boulder County. The headwaters then moved down the South Platte River and caused widespread flooding with record flood stages at several locations as it made its way downstream.  The record high flood stages resulted in widespread flooding along the South Platte River basin. The flood damage encompassed 4500 square miles of the Front Range…left 7 dead… Forced thousands to evacuate…and destroyed thousands of homes and farms. Record amounts of rainfall generated flash floods that tore up roads and lines of communication… Leaving many stranded. Nearly 19000 homes were damaged… And over 1500 destroyed. Colorado department of transportation estimated at least 30 state highway bridges were destroyed and an additional 20 seriously damaged. Preliminary assessments of the state`s infrastructure showed damage of $40 million to roads and $112 million to bridges. Repair costs for state and county roads ran into the hundreds of millions of dollars. Miles of freight and passenger rail lines were washed out or submerged… Including a section servicing Amtrak`s iconic California Zephyr. The town of Lyons was isolated by the flooding of St. Vrain creek…and several earth dams along the Front Range burst or were over-topped. Floodwaters swept through Estes Park; damaged hundreds of buildings and destroyed large sections of U.S. 34 from Loveland and U.S. 36 from Lyons to Boulder. U.S. 34 suffered the most damage… With 85 percent of its roadway and bridges destroyed. In Weld County…about nearly two thousand gas wells were damaged and had to be closed off as the floodwaters inundated entire communities. Sewage treatment plants and other utilities were knocked out in a number of towns. Governor Hickenlooper declared a disaster emergency on September 13th…in 11 counties across northeast Colorado including:  Adams…Arapahoe…Broomfield…Boulder…Denver…  Jefferson…Larimer…Logan…Morgan… Washington and Weld. By the 15th…federal emergency declarations covered those counties as well as Clear Creek County. Projected losses from the flooding statewide was nearly two billion dollars in property damage…according to Eqecat… A catastrophe modeling firm.  The damage was most severe in and around Lyons and Boulder.  More than 11 thousand people were evacuated…reportedly the largest since Hurricane Katrina. President Obama declared a state of emergency for Boulder and Larimer counties.  An additional 10 counties were added on the 16th and included: Adams… Arapahoe…Broomfield…Clear Creek…Denver…Jefferson…  Morgan…Logan… Washington and Weld counties. The president also declared a major disaster specifically for Boulder County.  There were six fatalities directly attributed to flash flooding. Two 19-yr old teenagers died on the 11th…after they were swept away by floodwaters after abandoning their car on Lindon Drive in Boulder. In Jamestown…a 72-yr old man was killed when the building he was in collapsed. An 80-yr old Lyons resident died in the early morning hours of the 12th…when his truck was swept into the St. Vrain River near his home. Later on the 12th…a 79-yr old Larimer County resident was killed when she was swept away while trying to climb to safety from her home in Cedar Point. A 61-yr old cedar point resident died when her home was swept down the Big Thompson River by the floodwaters. An 80-yr old Idaho Springs resident drowned in Clear Creek when the embankment he was standing on collapsed. In Boulder…some of the monthly records broken included: one-day all-time record: 9.08 inches which shattered the previous wettest day of 4.8 inches set on July 31… 1919; one-month record of 18.16 inches…which broke the previous all-time monthly record of 9.59 inches set in May of 1995; wettest September on record which broke the previous record of 5.5 inches set in September of 1940; one-year record of 34.15 inches broke the previous wettest year of 29.93 inches set in 1995. At Denver International Airport…the total precipitation for the month of September was 5.61 inches…which was 4.65 inches above the normal of 0.96 inches. This is the most precipitation ever recorded in Denver for the month of September. Daily precipitation records included 1.11 inches on the 12th and 2.01 inches on the 14th.


In 1974…post-frontal rain changed to snow overnight for the first snow of the season. Snowfall totaled only 1.8 inches at Stapleton International Airport where north winds gusted to 40 mph on the 11th. High temperature of only 46 degrees on the 12th set a new record low maximum for the date.

» Click here to read the rest of September 11 to September 17: This Week in Denver Weather History

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Thornton’s weekend to be dry, start cooler then heat back up

Friday, September 9th, 2016 5:19am MST

The three-day period is going to feature varying temperatures from comfortable and seasonal to hot by the time it ends. Overall conditions will be dry and calm.

A cold front will be moving through on Friday and that is going to cool things down over the mercury readings of recent days. Look for a high temperature around the 80 degree mark. We’ll see sunny skies above and dry conditions. Some breezy winds can be expected by mid-afternoon into the evening.

For Saturday, weather conditions look to be fantastic for the city’s annual Harvest Fest. Conditions will be much like today with highs just a hair below normal and lots of sun and calm conditions.

The heat returns to close out the weekend as high pressure returns. High temperatures on Sunday, Patriot Day, will be pushing at and perhaps a bit above 90 degrees. It will be sunny and dry.

Have a great weekend!

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