First freeze of the 2015 season expected at DFW / North Texas

How does the first freeze of 2015 compare with normal (climatology)? ❄️  The average first freeze at DFW is November 22.  Therefore, this year’s freeze was right on schedule, based on the current 30-year average (1981-2010). Other Freeze Statistics for DFW: Average first freeze: November 22 Average last freeze: March 13 Earliest freeze on record: […]

What is virga? There’s rain on radar, but it’s not raining!

The fluid dynamics associated with atmospheric disturbances cause the downstream air (ahead of the disturbance, before it arrives at a location) to rise, and the upstream air (behind the disturbance, i.e., after the disturbance has passed).  If there is sufficient moisture in the area of rising air, clouds and precipitation may form.  Necessary and sufficient […]

What is thunder? How hot is lightning?

Imagine yourself as a cloud, happily floating over the surface of the Earth without a care in the world. As you drift across the sky, the millions of tiny water droplets and ice crystals that you are composed of brush against each other, causing a buildup of electric charges in your cloud body. The negative […]