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    Jesse Ferrell

    High Barometric Pressure Records Challenged Saturday

    By Jesse Ferrell, Meteorologist/Community Director
    11/23/2013, 7:35:36 AM

    An unusually strong high-pressure system is moving over the northern Plains today, causing extreme pressure readings. But will they break records? Most evidence I have seen says no, but there's not much of a margin for error. Generally, pressure records in the northern U.S. are around or over 31.00" Hg, which is about 1050 mb.


    504x487_11231659_namncsfcwbg


    Blog reader Mike H. pointed out that Dave Murray had posted a discussion on Facebook discussing the extreme high pressure. Today's HPC surface map shows a 1049 mb high this morning, so it warrants an investigation. CoolWx.com shows that a couple stations have passed that 1050 mark this morning:


    550x366_11231701_pres-uss


    This is what the current pressure map looks like right now (noon ET Saturday) (see also CoolWx):


    590x370_11231710_presr1123b

    But what matters (in weather history) is what specific stations are reading, and typically there are only 2-3 stations per state that maintain pressure records. I hand checked the records at many of these stations this morning (versus the 4-KM WRF model's predictions) - as far southeast as Missouri - and the most likely candidate I found was Sioux Falls, South Dakota, whose record is 31.12 inches, but the map shows closer to 31.00 inches.


    590x459_11231713_presr1123a


    I didn't have time to look at every station's record, so if you find others that are within 0.10", post a comment below.

    The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com

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    Jesse Ferrell