Waving the White Flag: I Surrender

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...

Commentary on Freezing

Updated: 2:21 PM GMT on October 17, 2016

More False Accusations

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...

Frost

Updated: 11:47 PM GMT on October 10, 2016

Self-Destruct Sunshine: A Rite of Spring

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...

Weather Analysis

Updated: 1:15 PM GMT on May 23, 2016

Frost: Nature's Last Line of Defense

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...

Misleading Meteorology

Updated: 7:48 PM GMT on May 21, 2016

More on Blocking

By: Lee Grenci, 3:01 PM GMT on May 13, 2016

Today's 500-mb pattern really drives home the point I made in last week's blog, The Cheapening of Blocking Highs. I admit I'm old school, and I've always followed the criteria of the "Father of Blocking," Daniel J. Rex (with the exception of the duration criterion and the reference to the 45 degrees of longitude).

By way of review, Rex's criteria for a blocking high were:

a) the basic westerly current must split into two branches,
b) each...

Weather Analysis A Short Blog

Updated: 5:14 PM GMT on May 13, 2016

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About 24hourprof

Retired senior lecturer in the Department of Meteorology at Penn State, where he was lead faculty for PSU's online certificate in forecasting.