Study on the Precursor Signal Capturing of Unfavorable Weather: Months/Years in Advance to Ultra-Early Forecast for Hourly Transient Weather Changes during the Beijing Winter Olympics

Table 6

Saturated condensation flux (ξ_p) and geo-potential heights at various isobaric surfaces over Beijing, Vancouver, and New York.

Isobaric surface (hPa)	Beijing		Vancouver		New York
	Geo-potential height	ratio × 10^−3	Geo-potential height	ratio × 10^−3	Geo-potential height	ratio
300	968	0.19	968	0.39	—	—
500	584	0.43	586	0.31	584	0.44
700	314	0.48	316	0.75	—	—
850	158	0.48	148	0.47	154	0.35

_p ratio refers to the ratio of mean value of _p center of its surrounding area.