chapter 18 test 5 material begin. air exerts a force on the surface of objects that it contacts. ...
TRANSCRIPT
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Chapter 18Test 5 material
Begin
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AIR EXERTS A FORCE ON THE SURFACE OF OBJECTS THAT IT CONTACTS.
AIR PRESSURE IS A MEASURE OF THAT FORCE PER UNIT OF SURFACE AREA
Washington, IL tornado 11/17/13
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WITH FEWER AIR MOLECULES IN THE UPPER ATMOSPHERE, THE PRESSURE DECREASES AS WE RISE IN THE ATMOSPHERE
IT DECREASES AT AN INCREASING RATE
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MOUNTAIN SICKNESS DIZZY HEADACHE SHORTNESS OF BREATH RED BLOOD CELL COUNT NEEDS TO
INCREASE THINK CUBS WILL WIN IT ALL
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AIR PRESSURE DIFFERS FROM ONE PLACE TO ANOTHER AND THESE MIGHT NOT BE FROM ELEVATION DIFFERENCES ALONE
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HUGE VOLUME OF AIR THAT IS RELATIVELY UNIFORM IN TEMPERATURE, DENSITY, AND WATER VAPOR CONTENT
AS AIR MASS MOVES ACROSS THE EARTH’S SURFACE THE PRESSURE FALLS OR RISES BASED UPON QUALITY OF THE AIR MASS
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RISING PRESSURE = IMPROVING WEATHER FALLING PRESSURE = STORMY WEATHER STEADY PRESSURE = WEATHER STAYS THE
SAME
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COLD OR WARM AIR?
DRY OR MOIST AIR?
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WHEN MOISTURE IS ADDED TO THE AIR, A HEAVIER GAS IS REPLACED BY THE WATER VAPOR SO MOIST AIR IS LIGHTER THAN DRY AIR
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DIVERGENCE OF AIR
ANTICYCLONE
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CONVERGANCE OF AIR
CYCLONE
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MILLIBARS = 1014 MB AT SEA LEVEL
INCHES = 29.92 INCHES AT SEA LEVEL
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BAROMETER - MERCURY /ANEROID ( LEGENDS ON THE DIAL)
BAROGRAPH ALTIMETER
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◦ Chapter 18◦ Test 5 Material
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PRESSURE GRADIENTS CORIOLIS EFFECT FRICTION CENTRIPETAL AND CENTRIFUGAL FORCE GRAVITY
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A GRADIENT IS SIMPLY A CHANGE IN SOME PROPERTY WITH DISTANCE. PRESSURE GRADIENT IS DIFFERENCE IN AIR PRESSURE FROM ONE PLACE TO ANOTHER.
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A GRADIENT IS SIMPLY A CHANGE IN SOME PROPERTY WITH DISTANCE. PRESSURE GRADIENT IS DIFFERENCE IN AIR PRESSURE FROM ONE PLACE TO ANOTHER.
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AN ISOBAR IS A LINE THAT CONNECTS POINTS OF EQUAL AIR PRESSURE.
WHEN ISOBARS ARE CLOSELY SPACED, WE HAVE A STRONG PRESSURE GRADIENT AND HIGH WINDS.
WHEN THE ISOBARS ARE FAR APART, THE GRADIENT IS WEAK AND WINDS ARE LIGHT.
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EARTH’S ROTATION IS RESPONSIBLE FOR THE CORIOLIS EFFECT WHICH IS A DEFLECTION OF THE WINDS.
IN THE NORTHERN HEMISPHERE, WINDS ARE DEFLECTED TO THE RIGHT;
IN THE SOUTHERN HEMISPHERE TO THE LEFT.
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AN INWARD PULLING FORCE
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AN OUTWARD PULLING FORCE
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CENTRIPETAL AND CENTRIFUGAL FORCE TOGETHER PRODUCE A CIRCULAR PATTERN OF WINDS AROUND HIGH AND LOW PRESSURE SYSTEMS
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LAND BREEZE***
OCCURS AS A LOW PRESSURE SYSTEM DEVELOPS OVER WATER AT NIGHT DUE TO SPECIFIC HEAT DIFFERENCES. GOES FROM THE LAND OUT TO THE WATER
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SEA BREEZE*
OCCURS AS LOW PRESSURE AREA DEVELOPS OVER LAND DURING HEAT OF DAY. AIR FLOWS FROM OCEAN TO LAND BRINGING IN COOLING WINDS.
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KATABATIC WIND
COLD DRY MOUNTAIN WIND
ALSO KNOWN AS MISTRAL & BORA
CAN CAUSE EXTREMELY COLD TEMPERATURES IN A RELATIVELY SHORT PERIOD OF TIME.
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CHINOOK WINDS
WARM AND DRY MOUNTAIN WIND BRINGING RAPID TEMPERATURE INCREASES
ALSO KNOWN AS ZONDA, FOEHN, & SANTA ANA
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MONSOON*
SEASONAL REVERSAL OF WIND
DRY MONSOON OCCURS IN WINTER WITH LOW PRESSURE OVER WATER
WET MONSOON OCCURS IN SUMMER WITH LOW PRESSURE OVER LAND
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AIR MASSES & FRONTS
Chapter 19
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AIR MASS
A LARGE BODY OF AIR THAT IS CHARACTERIZED BY THE SAMENESS OF TEMPERATURE & HUMIDITY
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SOURCE REGION******
THE AREA WHERE AN AIR MASS ACQUIRES ITS PROPERTIES OF TEMPERATURE AND MOISTURE
CONTINENTAL – LAND [DRY]
MARITIME OR MARINE – WATER [MOIST]
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AIR MASSES*********
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FRONTS********
BOUNDARIES THAT SEPARATE AIR MASSES OF DIFFERENT DENSITIES
WARM – OVER RUNNING
COLD
OCCLUDED - PINCHING
STATIONARY
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WARM FRONT
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COLD FRONT
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OCCLUDED
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STATIONARY FRONT
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MID-LATITUDE CYCLONES***
PRIMARY WEATHER PRODUCERS IN MID- LATITUDES [30 –60 DEGREES]LARGE CENTERS OF LOW PRESSURE THAT GENERALLY TRAVEL FROM WEST TO EAST LASTING FROM A FEW DAYS TO MORE THAN A WEEKCOUNTERCLOCKWISE MOTION
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