| Barometer |
Wind |
Clouds |
Reason |
Results |
| Slow drop in pressure |
Increasing speed |
Cirrus then cirrostratus then altostratus and then nimbostratus |
Warm front moving in |
Rain in about 2 days that may last a few days. Warmer weather. |
| Pressure levels off |
Direction changes |
Nimbostratus changes to stratocumulus |
Outgoing storm |
Rain starts to lighten |
| Slow then rapid fall in pressure |
Wind |
Altostratus and then cumulostratus or nimbostratus. |
Cold front |
Severe weather that does not last long. Little warning. |
| Sharp rise |
direction changes. Gusts. |
Cumulonimbus starts to clear. |
Outgoing storm |
Showers and thunderstorms. Cooler temperatures |
| Steady rise |
Decreasing winds |
Stratocumulus to altocumulus to clearing skies. |
Outgoing storm |
Precipitation decreases. Cooler weather. |
