The Deep, Deep Low in the Bering Sea

By: 24hourprof, 4:39 PM GMT on November 16, 2014

In the aftermath of the very intense, 924-mb extratropical low-pressure system in the Bering Sea, I read several historical accounts regarding the low's place in weather records. A scientific reference in one of the blogs caught my eye, but for dubious reasons.

For reference, the lowest central pressure of Hurricane Andrew (1992) was 922 millibars. Despite the potential of a similar pressure at its peak, wind speeds in extratropical cyclones such as the...

Updated: 7:41 PM GMT on November 17, 2014

Chesapeake and Delaware Bay-Effect Precipitation

By: 24hourprof, 3:08 PM GMT on November 15, 2014

This morning, there were two bands of bay-effect precipitation over Chesapeake and Delaware Bays (one band over each bay). Below is a loop of infrared satellite images spanning from 1015 UTC to 1345 UTC, which shows the two convective bands of clouds.


A loop of infrared satellite images from 1015 UTC to 1345 UTC on Saturday, November 15, 2014.

The bands tend to align themselves with the mean-layer wind in the lower half of the troposphe...

Updated: 4:12 PM GMT on November 15, 2014

The Polar Vortex...Blah, Blah, Blah

By: 24hourprof, 10:06 PM GMT on November 08, 2014

I had a dental procedure last week to fix resorption in one of my teeth. I first had a root canal, followed by surgery that exposed the root of the tooth, where my endodontist had to fill two holes caused by the resorption. The aftermath has not been pleasant.

The pain from my surgery was bad enough. Then I heard the media once again predicting the approach of the "polar vortex" from Canada and the associated Arctic air arriving over the contiguous sta...

Updated: 10:23 PM GMT on November 19, 2014

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

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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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