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'March winds and April showers bring forth May flowers'
Arcus clouds are low-level, wide ranging clouds typically associated with powerful storm clouds and thunderstorms.
A convergence line is a band of cloud that remains fairly stationary and can produce large amounts of rain across a relatively small area.
The weather plays a significant role in the production, distribution and dispersion of pollen.
Please note that when changing units, only forecasts and maps will be affected.