Mountaineering Routes : Page 317
EtoNE
30.1 or above, falling rapidly
In summer, rain probable within 12 to 24 hours. In winter, rain
or snow, with increasing winds, will often set in when the
barometer begins to fall and the wind sets in from the NE
SE to NE
30.0 or below, falling slowly
Rain will continue 1 to 2 days
SE to NE
30.0 or below, falling rapidly
Rain, with high wind, followed, within 36 hours, by clearing,
and in winter by colder
StoSW
30.0 or below, rising slowly
Clearing within a few hours, and fair for several days
StoE
29.8 or below, falling rapidly
Severe storm imminent, followed, within 24 hours, by clearing,
and in winter by colder