November Weather Summary

November was another month featuring above normal temperatures over most of central and east central Illinois, with only the southeast portion of the state experiencing more seasonable temperatures.  Precipitation amounts averaged below normal over the northwest half to two-thirds of the area, with only the southeast portions of Illinois seeing above normal rainfall.  The drought conditions that were prevalent over east central and southeast Illinois were relieved some by the increase in rainfall, especially with the system that affected a good part of the Midwest on the 22nd of the month.

With the strong jet stream winds and Arctic cold remaining to our north for a good portion of the month, we had several spells of very pleasant weather with temperatures climbing into the 70s.  Usually one would think of November as being a cloudy dreary month.  Not so with November 2010, as Peoria registered only 3 cloudy days, while Springfield had only 5.  On the 12th and 13th, we saw afternoon temperatures climb well into the 70s.  The highest temperature on the 13th was in Cairo where the mercury soared to 82 degrees.  At Springfield, the temperature climbed to 75 degrees on the 12th. 

A major storm system developed across the southern Plains on the 21st and pushed across the region on the 22nd producing a variety of weather, ranging from wintry precipitation to the west and northwest of the track of the low, to severe thunderstorms and tornadoes to the east and southeast of the surface low track.  Widespread severe thunderstorms moved across west central, northwest and northern Illinois producing wind damage and large hail.  Two tornadoes were also reported in northern Illinois, one of which was rated an EF-2 (estimated winds 135 MPH).  This was the same weather system which brought significant rains to about the southeast half of Illinois, which was followed by another heavy rain-maker on November 22nd and 23rd.  Rain totals from 3 to 5 inches were common south of a line from Taylorville to Danville.  After this particular rain system moved through, we saw river levels across southeast Illinois rise significantly in addition to some minor flooding reported on rural roads.  This same weather system produced some wintry precipitation further north where freezing rain, mixed at times with sleet and snow, created some icy roads across the northern half of Illinois the day before Thanksgiving (11/24).



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