Yet Another Misuse of Water-Vapor Imagery

By: 24hourprof, 2:42 PM GMT on August 16, 2014

As a gradually weakening Hurricane Iselle bore down on Hawaii in early August, I was watching a television analysis of the storm, which included a color-enhanced water-vapor image of the Pacific basin similar to the standard image (below) at 21Z on August 6. The weathercaster correctly pointed out the "dry air" on Iselle's western flank (and that the ingestion of dry air was helping to disrupt Iselle).



The 21Z standard water-vapor image over t...

Updated: 11:58 PM GMT on August 16, 2014

Don't Stand under Large Trees

By: 24hourprof, 4:23 PM GMT on May 11, 2014

The NWS is warning people along the Front Range not to stand under trees with large limbs...trees have leaves and lots of snow on the way!


.WINTER STORM WARNING NOW IN EFFECT UNTIL 9 AM MDT MONDAY...

* TIMING...SNOW...HEAVY AT TIMES WILL CONTINUE OVER THE NORTHERN
MOUNTAINS AND FOOTHILLS. SNOW IS EXPECTED TO CONTINUE INTO
MONDAY MORNING BEFORE GRADUALLY DECREASING BY MIDDAY.

* SNOW ACCUMULATIONS...6 TO 12 INCHES F...

Updated: 4:25 PM GMT on May 11, 2014

Thoughts on the April 27-28 Tornado Outbreak

By: 24hourprof, 1:55 PM GMT on May 07, 2014

In the aftermath of the tornado outbreak over the Deep South on April 27-28, 2014, I was bothered by reporters walking onto private property where homes were dramatically damaged (obviously, the owners were not there because the homes were essentially destroyed). To my chagrin, some reporters then picked up personal property and held it up to the camera. I think such behavior by the media is both disrespectful and very presumptuous. What right do they have to go o...

Severe Weather Short Blog

Updated: 7:13 PM GMT on May 07, 2014

International Falls, Minnesota: Frigid Begets Super-Frigid

By: 24hourprof, 9:48 PM GMT on December 12, 2013

The temperature at International Falls, Minnesota, plummeted to minus 33 degrees Fahrenheit early Tuesday morning (Climate Summary for December 10). The low occurred between 4 and 5 A.M. CST on December 10, but, if you were a rookie forecaster working during the evening of December 9, you might not have predicted such an extreme minimum.


A portion of the 00Z surface analysis on December 10 (6 P.M. CST on December 9). Full analysis. Courtesy of WPC.<...

Weather Forecasting Microphysics

Updated: 2:48 PM GMT on December 13, 2013

Ice Storm over the Southern Plains: A Case of Differential Temperature Advection

By: 24hourprof, 5:04 PM GMT on December 07, 2013

I'm sure some readers have heard professional forecasters allude to differential temperature advection. well, the ice storm over the Southern Plains on Friday (December 7) is an example of one of the impacts of this process.


The meteogram at the Dallas-Fort Worth Airport from 20Z on December 5 to 21Z on December 6, 2013. Courtesy of the University of Wyoming.

For starters, check out the meteogram above, which shows conditions at the Dalla...

Synoptic Meteorology Short Blog

Updated: 1:38 PM GMT on December 08, 2013

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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.

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