Detailed mountain weather forecast - West Highland

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Updated: 0343 on Mon 20 May 2013

Overview for Monday

A mostly dull overcast start with hill fog . Some bright or sunny intervals in Northwest and gradually becoming more widespread. Risk of heavy, thundery showers with hail developing over the Trossachs.

Hazards

Persistent extensive hill fog: At first in morning, mainly eastern exposures, becoming more patchy by late morning. [Medium risk]

Thunderstorms: Medium risk of heavy, sharp, showers developing over Trossachs, little or no risk elsewhere. [Low risk]

Heavy persistent rain: Some intense showers possible in the Trossachs. [Low risk]

Strong sunlight: Especially to the northwest, sunburn risk. [High risk]

Weather summary

Dawn to 0900
Fog
20% chance of drizzle

0900 to 1200
Sunny Intervals
10% chance of drizzle

1200 to 1500
Sunny Intervals
20% chance of hail

1500 to Dusk
Heavy Rain Shower
30% chance of rain

Weather

A misty start with some fog and low cloud around gradually brightening up with some sunny spells. For those out early, then there is the opportunity to ascend through the low cloud, whose tops will be around to be rewarded by some fine views in the sunshine above the inversion. As temperatures rise, there will be an increasing chance of showers developing, especially across the Trossachs, where they will turn heavy and thundery with some large hail. The strong May sunshine will lead to a high risk of sunburn and sunstroke also dehydration could be an issue.

Visibility

Moderate to poor widely in the morning with hill fog but soon becoming good. Becoming poor again in the heavier showers in the afternoon.

Hill fog

Patchy to low levels at first gradually lifting. Then occasional patches above 750-900m tending to lift above tops. Temporarily lowering to 500m in any afternoon showers in the northwest.

Maximum wind speeds above 600m

Northwesterly 10mph increasing 15-20mph later.

Temperatures

Glens - Plus 5 to Plus 8 Celsius rising to Plus 19 Celsius.
900 m - Plus 13 Celsius.
Freezing level - Well above the summits.