Public Information Statement
Issued by NWS Chicago, IL

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NOUS43 KLOT 171605
PNSLOT
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
180415-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
1105 AM CDT SUN AUG 17 2014 /1205 PM EDT SUN AUG 17 2014/

...LOW CLOUDS OVER PARTS OF NORTHERN IL TODAY ARE RARE FOR AUGUST...

BOTH O`HARE AND MIDWAY AIRPORT IN CHICAGO WERE OBSERVING CLOUD
CEILING HEIGHTS BELOW 1000 FEET ABOVE GROUND LEVEL AS OF 11 AM
TODAY. FROM 1973 TO 2007...ONLY 2 TO 3 PERCENT OF ALL AUGUST DAYS
HAD CEILING HEIGHTS BELOW 1000 FEET AT THIS TIME OF DAY.

EVEN CEILING HEIGHTS IN THE 1000 TO 3000 FOOT RANGE ARE RARE FOR
THIS TIME OF YEAR AND TIME OF DAY. APPROXIMATELY 15 PERCENT OF ALL
AUGUST DAYS FROM 1973 TO 2007 HAD CLOUD CEILING HEIGHTS BETWEEN
1000 AND 3000 FEET ABOVE GROUND LEVEL.

JUST AS A NOTE...CLOUD BASES ARE CONSIDERED TO BE A CEILING HEIGHT
WHEN TOTAL CLOUD COVERAGE AT THAT GIVEN HEIGHT ABOVE THE GROUND
IS OVER 60 PERCENT.

$$

RC






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