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May 17, 2011

Can tornadoes strike at night?

FROM TODAY'S PRINT EDITIONS:

November twisterDonald Gansauer, in Canton, asks: “Can tornadoes occur at night? I can’t recall of ever hearing a report of one during darkness.”

They sure can. NOAA says most tornadoes occur between 3 p.m. and 9 p.m., when daytime solar heating fuels thunderstorms. But they can and do strike at all hours. An EF-1 twister ripped Baltimore City and County at 1:35 a.m. last Nov. 17. Nighttime tornadoes are especially deadly because people sleep through warnings. Buy a NOAA Weather Radio.

(SUN PHOTO: Laura Dixon, Baltimore, Nov. 18, 2010) 

Posted by Frank Roylance at 12:01 AM | | Comments (3)
Categories: From the Sun's print edition, Sky Notes
        

Comments

The one that I heard in Severna Park years ago was certainly after dark. I'm just back from a short vacation in North Carolina. Not as bad as Alabama, but the April tornado outbreak still left some horrific damage which I saw driving through little Snow Hill in eastern NC and in the Glade Spring area along I-81 coming back through Virginia. Glade Spring's was a meandering tornado that did even more damage, and it debunks a myth that tornados don't form in hilly areas. A local chatted with me about it in a nearby fast food place. He was lucky but upset that his neighbors couldn't get FEMA help. He conceded that Alabama was worse off, but what I saw in Virginia still gives one pause at what a twister can do.

Apparently Donald never saw "Twister".

Was talking with a fellow old-timer today about tornadoes. He said that he can't remember hearing much about tornadoes when he was growing up in Maryland and that there seem to be more nowadays. Is he right or is he just having a memory blip? Has Maryland experienced more tornadoes in the last, say, 20 years?

FR: Hard to know for sure whether there are actually more tornadoes. But we are certainly hearing more about them, for a couple of reasons. First, with higher populations there are more people in more places to report funnel clouds and severe-storm wind damage (and more media eager to report it). Second, the NWS folks are pretty diligent about surveying damage and documenting whether it was caused by rotating or straight-line winds. I doubt they did that as much in the past. And third, it's only been since the 1980s that we have had Doppler radar networks capable of detecting the signature of wind rotation. That has led to the identification of tornadoes we probably would have overlooked previously.

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About Frank Roylance
This site is the Maryland Weather archive. The current Maryland Weather blog can be found here.
Frank Roylance is a reporter for The Baltimore Sun. He came to Baltimore from New Bedford, Mass. in 1980 to join the old Evening Sun. He moved to the morning Sun when the papers merged in 1992, and has spent most of his time since covering science, including astronomy and the weather. One of The Baltimore Sun's first online Web logs, the Weather Blog debuted in October 2004. In June 2006 Frank also began writing comments on local weather and stargazing for The Baltimore Sun's print Weather Page. Frank also answers readers’ weather queries for the newspaper and the blog. Frank Roylance retired in October 2011. Maryland Weather is now being updated by members of The Baltimore Sun staff
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