User:Anthony.Sebastian/SebastianSandbox5

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Table 2: Meteorological conditions that define the Pasquill stability classes

Surface windspeed		Daytime incoming solar radiation			Nighttime cloud cover
m/s	mi/h	Strong	Moderate	Slight	> 50%	< 50%
< 2	< 5	A	A – B	B	E	F
2 – 3	5 – 7	A – B	B	C	E	F
3 – 5	7 – 11	B	B – C	C	D	E
5 – 6	11 – 13	C	C – D	D	D	D
> 6	> 13	C	D	D	D	D
Note: Class D applies to heavily overcast skies, at any windspeed day or night

Historical stability class data, known as the Stabilty Array (STAR) data, for sites within the United States can be purchased from the National Climatic Data Center (NCDC) which is part of the National Oceanic and Atmospheric Administration.

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