| Last 3 hours | |
| ▲10 mb | Gale Warning (34 – 47 knots) |
| ▲6 mb | Strong Wind Warning (26 – 33) |
| ▲1.1-2.7 | poorer weather to come ( > 1015 mb) |
| ▼1.1-2.7 | rain & wind ( < 1009 mb) |
| ▼4 mb | storm ( < 1009 mb) rain & wind (1009 - 1023 mb)) |
| ▼6 mb | storm with a Strong Wind Warning ( <1009 mb) |
| ▼7 mb | firestorm conditions if fire exists & ( < 990 mb) & ( > 40 oC) sustained |
| ▼10 mb | storm with a Gale Warning ( <1009 mb) |
| Severe Thunderstorm Warning | |
| Last 3 hours ▼4 mb Last 12 hours ▼8 mb (Pressure < 1005 mb) |
|
| Anytime in Storm Season (Tropics) | |
| steady | Tropical Cyclone Early Warning if continuously steady for 6 hours |
| ▼5 mb | tropical revolving storm (for fall below tropical seasonal average) |
| Last 3 hours ▼ | < 1009 mb | 1009 – 1018 mb | 1019 – 1023 mb | > 1023 mb |
| rising | clearing and colder | no change, except poorer weather to come for 1.1 – 2.7 mb and > 1015 mb | no changeexcept poorer weather to come for rise of 1.1 mb – 2.7 mb | fair weatherexcept poorer weather to come for rise of 1.1 mb – 2.7 mb |
| steady | clearing and colder | no change | fair with slight temperature change | fair with no marked temperature change |
| 1.1 – 2.7 mb | rain& wind | no change | no change and rain within 24 hours | fair and slowly rising temperature |
| 4 mb | storm | rain & wind | rain& may get increasing wind speed and temperature | warming trend |
| 10 mb | storm and Gale | |||