Tagged: spc RSS

  • jimmy 8:28 pm on October 26, 2010 Permalink | Reply
    Tags: fall, , spc, , tornadoes,   

    The giant storm currently wrecking havoc across the Midwest has a low pressure (957mb per 18z Surface Analysis from NOAA’s Hydrometeorological Prediction Center) equivalent to a category 3 hurricane. To be clear, that is historically low for the Midwest.

    CIMSS notes that the storm is still deepening. At least the winds of this storm aren’t on par with those of a major hurricane, unless you count the nearly 200 reports of severe winds/damage so far today (blue dots on map to right). But even the strongest severe thunderstorm winds rarely make it much into category 1 hurricane territory. (Winds over 58mph are severe, winds over 74mph are hurricane, winds over 114mph are category 3 hurricane.)

  • jimmy 11:04 pm on June 12, 2010 Permalink | Reply
    Tags: bow echos, , spc, summer, ,   

    Interesting forecasting process here: the SPC (Storm Prediction Center) issued a Severe Thunderstorm Watch (#301) this afternoon for parts of Illinois and Indiana (no news there, it’s June in the Midwest, afterall). But then, 4 hours later, with a nice bow echo (that radar image will ony be available for 5 or 6 days, sorry) approaching the edge of that watch area, it become a matter of some discussion whether to issue a new watch to the east of the current one (BTW, one reason I find this whole thing interesting is because my county is JUST to the east of Watch 301 as defined at 2pm EDT by the SPC, and this was making me sad since I like severe weather and being inside severe watches). Point in favor of a new watch included, well, the GIANT BOW ECHO of severe thunderstorms, but points against it included, well, a fairly stable atmosphere (e.g. not friendly to the creation or continuation of severe weather) over Ohio.

    The solution to the problem of Giant Bow Echo Of Severe Thunderstorms Leaving Watch Area But Will Lose It’s Severe Status About An Hour Later? Extend the current watch slightly to the east. This avoids the issue of issuing a new watch that only includes a few counties and only runs a few hours, but it also makes sure to get the word out to the people of the 7 counties added to the watch area that a GIANT SEVERE (and tornadic, judging by the warnings) BOW ECHO is coming.

    Nice. Well played SPC, well played.


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