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Ch 10
Sec A
Ch 10
Local Winds
Sec A
• Sea Breeze: Daytime
Local Winds
• Sea Breeze: Daytime
– Land heats up faster forming a low pressure area
– Air flows from the sea: a sea breeze
• Land Breeze: Nighttime
– Land heats up faster forming a low pressure area
– Air flows from the sea: a sea breeze
• Land Breeze: Nighttime
– Land cools quicker forming a relative high pressure
area
– Air flows from the land to the sea: a land breeze
– Land cools quicker forming a relative high pressure
area
SEABREEZE
– Air flows from the land to the sea: a land
breeze
1
Ch 10
Sec A
2
Ch 10
Local Winds
Sec A
Local Winds
• Valley Breeze: Daytime
• Sea Breeze: Daytime
– Land heats up faster forming a low pressure area
– Air flows from the sea: a sea breeze
• Land Breeze: Nighttime
– Land cools quicker forming a relative high pressure
area
SEABREEZE
– Air flows from the land to the sea: a land breeze
– Land on the side of a mountain heats up faster than
air at the same altitude forming a low pressure area
– Air flows from the valley to the mountain
• Mountain Breeze: Nighttime
– Land on the mountain cools quicker than air at the
same altitude forming a relative high
– Air flows from the mountain side down:
a mountain breeze
3
Ch 10
Sec A
4
Ch 10
Local Winds
Sec A
• Valley Breeze: Daytime
Local Winds
• Valley Breeze: Daytime
5
6
1
Ch 10
Sec A
Ch 10
Local Winds
Local Winds
Sec A
• Valley Breeze: Daytime
• Mountain Breeze
–Is similar to
• Drainage Winds
• Downslope Winds
• Bora
–Occur as land breeze in Croatia
and British Columbia and Montana
7
Ch 10
Sec B
8
Ch 10
Local Winds
Sec B
• Mountain Lee Waves and Warm Downslope Winds
Local Winds
• Mountain Lee Waves and Warm Downslope Winds
• Winds follow contours on both side of mountain
ridges
• If they are warm winds they will descend on the
lee side of the mountain and then rise again
carrying water vapor up with them
9
Ch 10
Sec B
10
Ch 10
Local Winds
Sec B
• Mountain Lee Waves and Warm Downslope Winds
Local Winds
• Mountain Lee Waves and Warm Downslope Winds
• Winds follow contours on both side of mountain
ridges
• They form waves in the wind called:
– Mountain Waves
– Gravity Waves
11
12
2
Ch 10
Sec B
Ch 10
Local Winds
Sec B
Local Winds
• Mountain Lee Waves and Warm Downslope Winds
• Mountain Lee Waves
• Types of Clouds associated
with Mountain Waves
–Cap Clouds
–Roll Clouds: or Rotor Clouds
–ACSL:
Alto Cumulus Standing Lenticular
–CCSL:
Cirro Cumulus Standing Lenticular
13
14
3
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