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> Long Term Pattern: September '10 Plains/MW/GL/OV, Monthly Talk
Chicago Storm
post Oct 3 2010, 01:54 PM
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September 2010 Climatological Data For Streamwood, IL.

Day.....Hi.......Lo....Precip....Max Wind

1st.....81F......70F.....0.05"......9MPH
2nd....83F......65F.....1.70"......20MPH
3rd.....69F......57F.....0.00"......24MPH
4th.....67F......50F.....0.00"......19MPH
5th.....74F......47F.....0.04"......10MPH
6th.....80F......64F....TRACE.....11MPH
7th.....76F......57F.....0.00"......27MPH
8th.....71F......50F.....0.00"......13MPH
9th.....68F......48F.....0.00"......6MPH
10th...74F......52F.....0.15"......5MPH
11th...77F......56F.....0.11"......12MPH
12th...83F......51F.....0.00"......17MPH
13th...80F......56F.....0.00"......14MPH
14th...77F......51F.....0.00"......4MPH
15th...76F......55F.....0.02"......5MPH
16th...68F......56F.....0.15"......21MPH
17th...74F......48F.....0.00"......7MPH
18th...64F......57F.....0.27"......13MPH
19th...67F......54F....TRACE.....5MPH
20th...75F......59F.....0.01"......3MPH
21st...88F......65F.....0.20"......45MPH
22nd..75F......62F.....0.00"......4MPH
23rd...88F......63F.....0.21"......19MPH
24th...79F......56F.....0.01"......30MPH
25th...60F......50F.....0.00"......14MPH
26th...60F......46F.....0.00"......10MPH
27th...64F......45F.....0.00"......11MPH
28th...71F......46F.....0.00"......10MPH
29th...74F......51F.....0.00"......10MPH
30th...72F......50F.....0.00"......17MPH
------------------------------------------------
Avr...73.8F....54.6F....0.11.....13.8MPH
Tot.............................2.92"

Overall Average Temperature: 64.2F

Hi Temps:
Max........88F
Min.........60F
Average....73.8F
60-69F.....9
70-79F.....14
80-89F.....7

Lo Temps:
Max........70F
Min.........45F
Average....54.6F
40-49F.....6
50-59F.....18
60-69F.....5
70-79F.....1

Precip:
Total.......2.92"
Precip Days...14
Average Per Day...0.10"

Wind:
Highest.....45MPH
Average.....13.8MPH
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Hertz
post Oct 3 2010, 04:02 PM
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For northern Ohio area, September 2010:

1st-5th: Month started hot, but with cool spell following. Temperatures in the upper 80s and lower 90s 1st and 2nd, lows mid 60s to 70. Fitting for a hot summer. Partly to mostly sunny except a stray storm far NW. Cold front approached quickly night of 2nd-3rd, a quiet and warm night still in the east half though. Front passes on the 3rd with line of showers & a few storms. Clearing afternoon on the 3rd, temperatures closer to normal with upper 70s generally. Still got into 80s in the morning eastern section. Chilly air arrives overnight 3rd-4th. Temperatures down into the 50s with some increasing clouds especially lakeshore. Partly to mostly cloudy and breezy 4th and cool with isolated showers mainly NE. Coolest in several months with upper 60s only for highs. Clearing overnight 4th-5th except far NE. Chilly lows with 40s all but lakeshore. A touch warmer but still pleasant on 5th; mostly sunny with low 70s except mid 70s far west.

6th-10th: Return of heat, but quickly gives way to more mildness. Still cool overnight 5th-6th but considerably milder than previous night; 50s for lows. A few warm advection sprinkles late for NW. Mixed sun/clouds and warmer on 6th (Labor Day); more clouds north and even a few warm advection sprinkles, but nothing but high clouds by evening. Highs rebound to upper 70s far east to mid 80s far west. Partly cloudy and warmer overnight 6th-7th. Lows in the 60s. Hot and mostly sunny 7th with upper 80s and lower 90s plus more humidity. Scattered afternoon and evening thunderstorms central and east along passing cold front. Front moves through late afternoon west, evening/early overnight east; cooler drier air with clearing to follow but some clouds along lakeshore. 50s for lows except near 60 far east. Mostly sunny inland and west for 8th, but cloudy followed by mix for eastern lakeshore. Cool; near 70 to lower 70s for highs. Mostly clear overnight 8th to 9th except mostly cloudy lakeshore. Chilly with upper 40s inland but 50s along lakeshore. Mixed clouds and sun 9th and 10th with most clouds lakeshore areas; sunny areawide by late on 10th. Still cool with upper 60s to lower 70s. Lows in upper 40s to lower 50s on 10th.

11th-15th:
Generally seasonable with a few fronts to deal with. Upper 40s-lower 50s again for morning on 11th. Increasing clouds on 11th with rain by early afternoon west to evening east. Highs mid-upper 60s west (rainly areas) to mid 70s east. Rain then cloudy and drizzly overnight 11th-12th. Lows mid-upper 50s. Clearing out on the 12th - morning west and afternoon east. Still pleasant with low 70s far east to upper 70s west. Continued mostly clear and pleasant overnight 12th-13th. Lows in the 50s. Mostly sunny 13th and warmer; low 80s for highs, but not humid. Sharp drop in temps with mostly clear overnight 13th-14th. Lows upper 40s-lower 50s. Mostly sunny 14th with pleasant temperatures. Slightly coolder with mid to upper 70s for highs. Partly-mostly clear and comfortable again overnight 14th-15th. Lows upper 40s-50s. Mix of sun and high clouds 15th; little change in temperatures with highs ranging through the 70s. Thickening high clouds evening on 15th.

16th-20th:
Pattern of occasional fronts continued, but one of them early in the period was very noisy. Rain moving in from west to east early hours on 16th, with some thunder as well. Rain clears midday on 16th with clearing west and central. More humid with highs lower 70s east to near 80 west. With warmth and moisture, only noteworthy severe event of month occurs ahead of strong low pressure trough. Severe watch issued for strong storms which move west to east through area afternoon and evening with even a few tornado reports and lots of gusty winds. Quieter weather overnight 16th-17th once storms pass with reduced humidity. Breezy north wind. Slow clearing on 17th but cool with mid-upper 60s for highs. Mostly clear overnigh 17th-18th and chilly; mid 40s to near 50 for lows. Turning generally mostly cloudy 18th with some light rain early on far NW. Warmer with mid-upper 70s for highs. A few showers overnight 18th-19th as cool front slowly seeps in from the north. Mild with lows near 60. Mostly cloudy with mainly isolated showers 19th. Seasonable temps with upper 60s-low 70s. Mostly cloudy overnight 19th-20th but some clearing east. Lows mid 40s far east but milder with mid 50s further west. General clearing area wide on 20th and continued pleasant temps. Highs upper 60s-low 70s. Mainly clear and comfortable evening on 20th.

21st-25th:
Hot weather makes a return, ended by cold front later in period. High clouds to start 21st with lows upper 40s far east-mid 50s elsewhere. Mostly sunny, much hotter, and more humid on 21st. Highs mid 80s east to low 90s (!) west. Very warm overnight 21st-22nd with rain/scattered storms arriving mainly late. Lows mid-upper 60s.. Fairly humid on 22nd with some scattered storms still southern areas. A bit cooler but still warm; highs upper 70s-lower 80s. Quiet and mild overnight 22nd-23rd with partly cloudy conditions. Lows low-mid 60s. Generally fair conditions on 23rd but some haze and cumulus east. Very hot again with highs upper 80s-lower 90s. Several record highs set, on the 1st day of astronomical fall. Mainly clear and exceptionally warm overnight 23rd-24th. Lows upper 60s-mid 70s (very impressive!). Sunny to start on 24th and once again record warm with highs upper 80s-near 90. Clouds, light showers, and gusty winds along cold front in afternoon. Front passes west late efternoon; east evening clearing around midnight. Much more seasonable overnight 24th-25th with lows in 50s. Generally clearing skies but more clouds in northern areas. Seasonable to even cool in a few areas on 25th with mostly sunny south and partly to mostly cloudy north; cloudy far NE with isolated showers. Highs mid 60s-near 70; very refereshing. Clear south, mostly cloudy north and especially NE evening with temperatures falling into the 50s and even some 40s.

26th-30th:
Coolish end to September, with one significant rain system. Chilly on 26th with upper 50s-mid 60s after lows mid 40s-low 50s. Cloudy overnight 26th-27th with some rain later on SE. Lows low-mid 50s. Cool again 27th with rain/drizzle all but far NW where generally cloudy. Highs near 60-lower 60s. Rainy overnight 27th-28th especially late but mild with mid-upper 50s most areas; even near 60 far east. Cold rain on the 28th; heavy early on with an inch in some places. Temps either in or falling into the 50s; a rather chilly day. Clearing west; partial clearing central overnight 28th-29th; lower 40s west-near 50 east. Sunny west half and partly to mostly cloudy east half on 29th as western edge of tropical plume tickles the area. Pleasant temperatures overall but rather variable with low 60s far east-low 70s west. Similar west-east sharp gradiant in cloudiness overnight 29th-30th. Lows mid 40s west-lower 50s east. Clearing all but far east on 30th. Warmer in west again with highs upper 60s east-mid 70s west; a very pleasant end to the month overall. Seasonable and breezy evening on 30th with clear west-partly cloudy east.

Monthly:
Overall temps: About 1.8F above normal
Overall rainfall: Generally a bit below normal but above normal a few eastern stations
Remarks: Not a bad month overall. Certainly a relief in temperatures after a very hot and steamy summer. Hopefully October won't be too bad either.


--------------------
Let's hope this winter actually happens!

Severe Wx 2013 Cuyahoga Cty


Severe thunderstorm watches: 6/12-6/13 (night), 6/25, 7/10, 7/23, 10/31-11/1 (night)
Tornado watches: 11/17
Tornado warnings: 6/12, 7/10
Slight Risk days: 4/10, 5/21, 5/22, 5/28, 6/1, 6/12, 6/24, 6/25, 6/26, 7/10, 7/19, 7/23, 8/7, 8/27, 9/11, 9/20, 10/6, 10/31
Moderate Risk days: 11/17
High Risk days:
Strongest thunderstorm to date (at CLE airport): 57 mph on 6/25 & 11/17 (thunderless convection on 11/17)
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