Traditional Barometric Weather Chart

Barometric Pressure Rising Barometer Reading Between inches of mercury Barometric Pressure Falling
Forecast kPa Forecast
High winds and cooler 27.5 and 28.4 (94.00 and 96.17) Gales, Hurricanes, Tornadoes
Continued windy and cloudy 28.4 and 28.7 (96.17 and 97.19) Very stormy
Increasing winds followed by cooler weather 28.7 and 29.0 (97.19 and 98.20) Stormy
Clearing, high winds and cool wave 29.0 and 29.3 (98.20 and 99.22) High winds with squalls. Clearer and cooler
High winds with cool wave preceded by squalls 29.3 and 29.6 (99.22 and 100.24) Clearing, slight squalls.  Fair and cooler tomorrow
Fair tomorrow (next 24 hours) with fresh winds tonight and tomorrow 29.6 and 29.9 (100.24 and 101.25) Unsettled and warmer with increasing winds
Fair with brisk winds which will diminish 29.9 and 30.2 (101.25 and 102.27) Cloudy and warmer followed by unsettled weather
If the barometer fluctuates between 29.9 and 30.2 by 1.4" and 3" (5 and 10) then rain, and probably thunder storms, will follow.
Generally fair and probably cooler today. Variable winds 30.2 and 30.5 (102.27 and 103.28) Storm brewing from direction of wind
Clear tonight and continued cool. Moderate winds 30.5 and 30.8 (103.28 and 104.30) Fair and warmer, followed by rain and wind
South-west rains with high winds 30.8 and 31.1 (104.30 and 105.31) Continued cool and cloudy. Warmer tomorrow