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ISOBARS

Air pressure is the weight of the air on the land and is measured in millibars using an instrument called a barometer.

Isobaric maps are used for accurate weather forecasting.

By visiting the “weather chart” by this link you will see the isobars for the UK showing the current weather fronts.

LIGHTNING

Also on the isobar page is a map of the UK depicting where lightning strikes are taking place. Visit “Thunder & Lightning” to see the latest storm. Cloud to cloud lightning is the most common form of lightning. Most often it occurs within a cloud and involves electricity passing between the negatively charged base of the cloud and its positively charged upper levels. Thunder is usually audible for up to around 20 miles from the lightning strike that caused it.

SHIPPING FORECAST

For the Gloucester region visit “Shipping Forecast” at this link and access the shipping forecast for Lundy.

BEAUFORT WIND SCALE

Code       Speed mph       Description

 0             below 1            calm

 1              2-3                  light air

 2              4-7                  light breeze

 3              8-12                gentle breeze

 4              13-18              moderate breeze

 5              19-24              fresh breeze

 6              25-31              strong breeze

 7              32-38              near gale

 8              39-46              gale

 9              47-54              strong gale

 10            55-63              whole gale

 11            64-74              storm

 12            above 74          hurricane