Retired senior lecturer in the Department of Meteorology at Penn State, where he was lead faculty for PSU's online certificate in forecasting.
By: Lee Grenci, 6:27 PM GMT on January 07, 2017
Last evening, while watching a national weather show on cable TV, a meteorologist began his presentation about the threat of heavy precipitation in California with an enhanced water vapor image (see below; Larger image). As I have preached and preached for years, using water vapor images to quantify atmospheric water vapor is just plain old bad science. And, yet, that's exactly what the meteorologist did.
The enhanced water-vapor image from GOES-1...
Updated: 1:22 PM GMT on January 09, 2017
By: Lee Grenci, 4:41 PM GMT on October 16, 2016
All of my professional career, I have lobbied for the temperature, 32 degrees Fahrenheit, to be called the melting point of ice. Perhaps it was the stubbornness of youth that made me so insistent. As I have grown older, I now believe that trying to get this convention adopted is a losing proposition. Not even close.
That's because the common experience of almost everyone is that most liquid water does indeed freeze at temperatures close to 32 degrees Fah...
Updated: 2:21 PM GMT on October 17, 2016
By: Lee Grenci, 8:48 PM GMT on October 10, 2016
Television weathercasters are at it again, accusing frost of killing plants. I'm re-posting a blog I wrote in 2012 about this topic (one of my very first blogs at Weather Underground).
In my experience, any mention of frost, as it relates to gardening, is almost always perceived in a pejorative context. Indeed, there are routinely a spate of frost advisories in spring and autumn around the beginning and end of the growing season (respectively). Portrayin...
Updated: 11:47 PM GMT on October 10, 2016
By: Lee Grenci, 9:27 PM GMT on May 21, 2016
In the year I graduated from high school, I became an avid fan of the television series, Mission: Impossible (1966-1973), starring Peter Graves, Barbara Bain, Greg Morris, Peter Lupus, and, one of my favorite all-time actors, Martin Landau. Grave's character, Jim Phelps, led this team of secret government agents called the Impossible Missions Force (IMF) (Stephen Hill played the leader during the first year of the series). Each episode began with Jim Phelps getting...
Updated: 1:15 PM GMT on May 23, 2016
By: Lee Grenci, 2:23 PM GMT on May 15, 2016
Early Sunday morning, the Cleveland office of the National Weather Service issued a Frost Advisory for some counties in northern Ohio and northwest Pennsylvania for Sunday night and early Monday morning. In part, it read:
...FROST ADVISORY IN EFFECT FROM 2 AM TO 9 AM EDT MONDAY...
THE NATIONAL WEATHER SERVICE IN CLEVELAND HAS ISSUED A FROST
ADVISORY...WHICH IS IN EFFECT FROM 2 AM TO 9 AM EDT MONDAY.
* TEMPERATURE...LOWS TONIGHT...
Updated: 7:48 PM GMT on May 21, 2016