Historic snowstorm in North Texas on 2/12/2010. DFW recorded its greatest 24-hour snowfall of all time (12.5").

General Snow Forecasting

Snow is a precipitation type that results from the build-up of ice deposition upon condensation nuclei. The snowflake size is amplified as ice crystals join together as the crystals move in the wind. A common theme in ice crystal development is the 6-sized structure of the ice crystals. The chemical bonding of ice molecules produces […]

Snow to Liquid Equivalent and Associated Forecasting Pitfalls

The snow-to-liquid equivalent is the amount of liquid precipitation that is produced after melting snow. The temperature profile of the troposphere and the surface temperature are important factors that determine this value. The “average” snow-to-liquid ratio is 10:1. This is saying that if 10 inches of snow fell and that snow was melted it would […]

Does a Warm Winter Mean the Summer Will be Hotter than Normal?

Introduction The title is a question that is frequently asked of meteorologists, especially in the wake of an abnormally warm or cool season; it is a topic of interest among atmospheric scientists and the general public alike.  In this article, we will attempt to answer this question using climatology, casting aside gut feelings and old […]

Beware of weather hype this winter. Know your weather source.

Beware of Snow Hype & Weather Hoaxes on Social Media

It’s that time of year… Winter. The season when those unrealistic snow and ice accumulation maps, for an unlikely event 10 days into the future, that often go viral on social media. So, I wanted to briefly discuss the nature of internet weather hype and how you can learn to recognize it. As the National […]

Unlucky 7 Snowiest Cities in the U.S.

Those of us who live around Atlanta, Georgia or Dallas, Texas, who only see around 2 or 3 inches of snow per year on average, can be heard complaining during the winter when a snow event occurs. There are, however, many cities around the nation where considerably more snow falls and it becomes part of the […]

Snow depth & percent coverage maps

Our high-resolution snow depth maps are updated several times a day and include the United States and much of Canada. ● Today’s Snow Cover Stats ● Interactive Map ● N. Hemisphere Sea Ice Anomaly Current Snow Cover on Google Maps (High-Res)         Return to the top Northern Hemisphere Ice Anomaly Return to […]

simulate the formation of snow, sleet, and freezing rain

What determines if snow, sleet, or rain will form?

Explore the type of precipitation Set the air and dew point temperatures by dragging the anchor points and learn what type of precipitation will fall to the ground. Each time you release the mouse button, the simulation starts. You must use an up-to-date browser version to view this simulation.

Wind Chill in Atlanta, Wind Chill Chart & Calculator

Currently in AtlantaThe temperature is ºF. The wind chill in Atlanta is . Georgia & Alabama Wind Chill Map Other Regions Southern Plains Southeast Wind Chill Calculator Calculate the windchill Index Windchill Calculation Enter in the air temperature (Tair) in degrees Fahrenheit and wind speed in mph, then click on the Calculate WC to compute […]

Wind Chill in Texas DFW & Wind Chill Calculator

Currently at Dallas – Fort Worth International AirportThe temperature is ºF. The wind chill is . Texas Wind Chill Map Other Regions Southern Plains Southeast Wind Chill Calculator Calculate the windchill Index Windchill Calculation Enter in the air temperature (Tair) in degrees Fahrenheit and wind speed in mph, then click on the Calculate WC to […]

Snow: Dallas/Fort Worth’s Top-20 Largest Snowfalls on Record

This chart shows the largest amounts on record for a calendar day.  Snow AmountRankDate 11.20″1Feb 11, 2010 (Thu) 7.80″2Jan 15, 1964 (Wed) 7.50″3Feb 17, 1978 (Fri) 4.70″4Nov 13, 1976 (Sat) 4.50″5Mar 01, 1942 (Sun) 4.00″6Jan 30, 1977 (Sun) 4.00″7Jan 24, 1948 (Sat) 4.00″8Jan 22, 1940 (Mon) 3.90″9Mar 07, 1947 (Fri) 3.80″10Jan 18, 1956 (Wed) 3.70″11Feb […]

Atlanta’s Top 20 Snowstorms & Temperature Trends

Atlanta’s biggest snowfall events of all time are listed in the table below.  The most snow ever recorded on a single day in Atlanta was on January 23, 1940 when 8.3 inches fell. The top 10 snowstorms in Atlanta have a median accumulation of 4.2 inches.  View the full list We often hear the cliche: […]

What is Cold Air Damming (the Wedge)?

Cold-air damming (CAD), often called “the wedge” in the Southeast, is an interesting meteorological feature that can result in tricky forecasts for meteorologists. Topography plays a major role in CAD events, and you need a mountainous range for this feature to develop. While CAD can occur in the Rockies, it is predominant east of the […]

Weather Myths: Too Warm for the Snow to Stick?

Before I begin this piece, I want to present a challenge.  The following chart shows the actual high and low temperatures for a full month at a location in the United States. *A condensed version of this writeup was also featured in the Douglas County Sentinel. Challenge: Can you spot the day with a historic […]

Birmingham’s Winter Storm Watch, Warning, & Advisory Criteria for Alabama

The National Weather Service has sole responsibility for issuing weather watches and warnings.  When it comes to winter weather, there are numerous advisory types ranging from Wind Chill Advisories to Ice Storm and Blizzard Warnings.  This page is devoted to the four main winter weather products:  Winter Storm Watches, Winter Storm Warnings, Winter Weather Advisories, […]

Lake effect snow formation illustration

Lake-Effect Snow: The Physics of Colossal Snow

One of the most awe-inspiring forces of nature is lake-effect snow. The amount of latent energy required to produce the lake-effect convection is astounding, and in some situations, snowfall rates can reach as high as 5 to 6 inches per hour.  In this article, we discuss the atmospheric physics, dynamics, and thermodynamics responsible for the […]