Tracking the Tropics: Development probable in the Bay of Campeche
NHC nearly ready to classify Tropical Disturbance as Depression #1

An unusual record was set in Las Vegas, Nevada on Monday

The "Dewpoint Depression" is rarely discussed in weather products for the public, but was the focus for a new record in Las Vegas, Nevada, on Monday.  "Dew Point Depression" is the difference between the temperature, and the dewpoint - the measure of the amount of moisture in the air.  Relative humidity is directly related to the dewpoint depression.  Here's the statement from the National Weather Service in Las Vegas:

RECORD EVENT REPORT...CORRECTED
NATIONAL WEATHER SERVICE LAS VEGAS NV
445 PM PDT MON JUN 27 2011

...ALL-TIME RECORD DEW POINT DEPRESSION SET AT LAS VEGAS TODAY...

AT 432 PM PDT TODAY THE DEW POINT DEPRESSION AT MCCARRAN
INTERNATIONAL AIRPORT IN LAS VEGAS REACHED 129 DEGREES. THE DEW
POINT DEPRESSION IS DEFINED AS THE DIFFERENCE BETWEEN THE AIR
TEMPERATURE AND THE DEW POINT TEMPERATURE. IN THE CASE OF TODAY THE
AIR TEMPERATURE WAS 107 DEGREES AT 432 PM AND THE DEW POINT
TEMPERATURE WAS -22 DEGREES. THIS MADE FOR A RELATIVE HUMIDITY OF 1
PERCENT AT THE TIME. THE PREVIOUS ALL-TIME RECORD DEW POINT
DEPRESSION FOR LAS VEGAS WAS 120 DEGREES SET ON JULY 2ND 2007.

THE ABOVE INFORMATION IS PRELIMINARY AND IS SUBJECT TO A FINAL
REVIEW BEFORE BEING CERTIFIED BY THE NATIONAL CLIMATIC DATA CENTER.




STACHELSKI/GORELOW

Comments

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The "Dewpoint Depression" is rarely discussed in weather products for the public, but was the focus for a new record in Las Vegas, Nevada, on Monday.

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Meteorologist Mike Tsolinas

Matt, I live here in Las Vegas and remember that day. It's something that occurs a couple of times a year, that summer it happened twice. A very small amount of dry continental air sneaks up from Mexico and extreme southern California. If conditions are right that follows a corridor northward through mountains and then down into our valley. As it is a downslope effect that is already dry to begin with as it heats up on the ride in it dries even further. If I remember correctly, the difference in hourly dewpoints dropped like 20 or more degrees. Great post my friend!

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Great explanation Mike, miss you on the local news here in Vegas!

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