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Freezing fog: What is it and how does it form?

Published: Friday, December 01, 2017 @ 8:40 AM

Learn what this type of fog is and why it can be dangerous.

Did you notice the frost looking a little unusual, with a ‘spiky’ appearance this morning? That's because it wasn't your typical frost.

>>Track the latest conditions with WHIO Interactive Doppler Radar

The frost was created by fog, called ‘freezing fog.’ Freezing fog develops when the water droplets within the fog touch something that is below 32 degrees.

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The droplets immediately freeze on contact, with each droplet freezing upon the last. This creates a jagged or dagger appearance.

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While pretty to look at, this can be dangerous in winter as it could lead to slippery roads. 

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Winter Weather Advisory issued ahead of anticipated accumulating snow

Published: Monday, March 19, 2018 @ 3:34 AM
Updated: Monday, March 19, 2018 @ 11:35 PM

Meteorologist Kirstie Zontini looks at the current timing and totals for snowfall this week.


  • Increasing clouds, rain/wintry mix develops late
  • Rain and snow changes to all snow late Tuesday 
  • Accumulating snow likely Tuesday night into Wednesday

>> WHIO Doppler 7 Interactive Radar


TONIGHT: Rain moving in and may change to freezing variety or sleet overnight, Storm Center 7 Chief Meteorologist Eric Elwell said. Temperatures fall to near freezing by morning.

TUESDAY: A wintry mix early will likely change to a cold rain through the middle of the day with temperatures in the lower 40s. Colder air will usher back in during the evening, causing the rain to change to snow. All snow is expected Tuesday night with likely accumulations. The Winter Weather Advisory for much of the Miami Valley is to go into effect at 8 p.m. and expire at 8 p.m. Wednesday, according to the National Weather Service in Wilmington.

>> 5-Day Forecast

WEDNESDAY: Snow likely early then tapering by midday. Snowfall accumulation will range from 2 to 4 inches with isolated areas picking up higher amounts. Clouds will linger through the day with gusty winds and temperatures in the middle to upper 30s. 

>> County-by-County Weather

THURSDAY: Skies will be mostly sunny. Highs to hold in the upper 30s.

FRIDAY: Expect lots of sunshine with clouds increasing late. Highs will reach the middle 40s. 

SATURDAY: Clouds will thicken with a chance of rain or snow late in the day or evening. Highs will reach the lower 40s. 

SUNDAY: Expect a chance of rain or snow in the morning with conditions improving in the afternoon. Highs will rebound into the upper 40s. 

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WPAFB Monday Weather: Evening rain showers, wintry mix expected

Published: Monday, March 19, 2018 @ 12:01 AM

WRIGHT PATTERSON AIR FORCE BASE—A cool start to the work week is expected, but temperatures are again expected to climb close to the middle 50s this afternoon, according to Storm Center 7 Meteorologist Brett Collar.

RELATED: County-by-County Weather

Most of today will be dry with clouds on the increase, but the chance for rain returns later this evening and tonight.

With temperatures falling below freezing around midnight, it’s looking like some of the rain may change over to a wintry mix.

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What is freezing rain and how is it different from snow and sleet?

Published: Friday, March 16, 2018 @ 2:31 PM

What is the difference between rain, freezing rain, sleet and snow? Meteorologist McCall Vrydaghs has the answers.

During the winter months you may often hear about snow, sleet and freezing rain. 

Each has its own hazards, but freezing rain can create hidden dangers on the roads, more than the others. Unlike snow or sleet on pavement, freezing rain can appear wet, but is actually a sheet of ice and will leave no traction for drivers.

WHIO Doppler 7 Interactive Radar

Freezing rain forms in the clouds just like snow, but it’s what happens after the snowflake leaves the cloud that changes everything. During a freezing rain event the air within the cloud is cold enough to produce a snowflake. 

If the snowflake falls into air below the cloud that is above freezing, it will melt into a raindrop. This droplet will continue to fall as rain as long as the environment remains above 32 degrees. 

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Since cold air is more dense than warm air, sometimes a thin layer of subfreezing air may settle to the surface cooling the ground. If this occurs, once the droplet hits anything that is below 32 degrees it will freeze on contact. Typically, elevated objects such as trees, overpasses and power lines are the first to accumulate ice. If freezing rain continues for an extended period of time, ice may become so thick that numerous accidents and power outages may occur.

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St. Patrick’s Day: Freezing rain could impact celebration

Published: Thursday, March 15, 2018 @ 6:53 AM
Updated: Friday, March 16, 2018 @ 1:27 PM

Meteorologist Kirstie Zontini breaks down the next system that can impact your St. Patty's Day.

A storm system will approach the Miami Valley just in time for St. Patrick's Day, said Storm Center 7 Meteorologist Brett Collar. Early Saturday morning the system will bring freezing rain and possible ice acccumulation. 

Slick roads and icy sidewalks could be an issue beginning at 4am Saturday, and last through noon. 

>> WHIO Doppler 7 Interactive Radar

  • Back roads and sidewalks may be untreated
  • Be aware of slippery surfaces if starting your party early
  • Winter Weather Advisory early Saturday so wear an extra layer for outdoor festivities. 


Prior to sunrise Saturday, freezing rain is set to move in from the west. This will become more widespread around sunrise and that’s when ice accumulation will start to become a big issue. This will continue through the morning hours but by 10am or 11am, we should start to see a transition over to rain as temperatures climb above freezing. Untreated surfaces however are likely to still be icy through lunch time.

>> 5-Day Weather Forecast

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