weather maps l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Weather Maps PowerPoint Presentation
Download Presentation
Weather Maps

Loading in 2 Seconds...

play fullscreen
1 / 36

Weather Maps - PowerPoint PPT Presentation


  • 165 Views
  • Uploaded on

Weather Maps. Much information is needed to interpret what is happening with the atmosphere. Need to condense this information in a small space. Need to show the geographic characteristics of this data. Weather maps can both display this data and summarize the patterns. Station Model

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Weather Maps' - omer


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide3

Much information is needed to interpret what is happening with the atmosphere.

Need to condense this information in a small space

Need to show the geographic characteristics of this data

Weather maps can both display this data

and summarize the patterns

slide4

Station Model

Allows the data to be plotted in a condensed and usable format

slide5

Location of the station on the map.

The name of the location or airport abbreviation might be given nearby.

slide6

Temp

Temperature information in degrees Fahrenheit.

slide7

Temp

dewpt

Dew Point Temperature in degrees Fahrenheit.

slide8

Temp

dewpt

Wind direction

A staff is rotated around the station.

Remember, winds are identified as the direction FROM which they come. This would be a west northwest wind or about 290º.

slide9

Temp

dewpt

Wind Speed

Attached to the staff are symbols for speed.

slide10

note, it is not on the end of the wind direction staff

The coding for the wind speed symbols can be generalized as:

half staff about 5 knots

full staff about 10 knots

these are additive for the total amounts

three full staffs=30 knots

flag about 50 knots

65 knots

slide11

pressure

Temp

dewpt

Current Barometric Pressure

slide12

Barometric Pressure is VERY important!

average barometric pressure at sea level is 1013.25 mb.

current barometric pressure is reported to the nearest TENTH

BUT, they don’t want to waste space

slide13

average barometric pressure at sea level is 1013.25 mb.

barometric pressure varies around this value

+ about 30 = 1043

somewhat higher

1013.3

somewhat lower

- about 30 = 983

slide14

133

x

average barometric pressure at sea level is 1013.25 mb.

barometric pressure varies around this value

they do not PRINT the beginning number or numbers

1013.3

---- 13.3

they, also, do not PRINT the decimal point, but report to the nearest TENTH

slide15

From the three numbers, you must INTERPRET whether the preceding value is

10

or

9

Which would make the value most realistic?

slide16

add the decimal point

and then consider which, a 10 or a 9

places the value NEAREST to the average pressure of

1013.25 mb.

slide17

(1013.3)

What is the pressure?

084

08.4

1008.4

962

96.2

996.2

281

28.1

1028.1

987.5

875

87.5

322

32.2

1032.2

slide18

Not only is the pressure itself important, but so is the way the pressure has been changing.

So, more information may be given and must be coded.

slide19

pressure

Temp

trend

dewpt

How has the barometer been changing?

+ it is higher now than in the past

- it is lower now than in the past

slide20

pressure

Temp

change

trend

dewpt

How much the pressure has changed

the amount of change in the past three hours

again, reported in TENTHS without the decimal

slide21

pressure

Temp

change

shown

trend

dewpt

What has the pressure been doing?

Shown diagrammatically

slide22

pressure

Temp

change

shown

trend

dewpt

Total amount of cloud

graphic depiction of percentage of the sky covered by clouds

slide23

about 60%

no clouds

about 10%

about 75%

about 25%

about 80%

completely overcast

about 40%

sky obscured

about 50%

slide24

highclouds

middleclouds

pressure

Temp

change

shown

trend

lowclouds

dewpt

Symbol positions to identify the cloud types

Cloud types tell much about the weather conditions. The cloud types are identified by symbols, and classed as low, middle, and high clouds.

slide25

highclouds

middleclouds

pressure

Temp

change

shown

trend

lowclouds

dewpt

How much of the sky is covered by low and middle cloud cover?

low or middle cloud cover

What amount, in tenths, of the sky is covered by low or middle clouds. This is a coded number with the percentage close to the printed number.

slide26

highclouds

middleclouds

pressure

Temp

change

shown

wxnow

trend

lowclouds

dewpt

What is the present weather?

low or middle cloud cover

The current weather is very important.

A detailed set of symbols provides weather descriptions.

slide27

Samples of present weather symbols.

rain

fog

*

snow

haze

slight rain showers

,

thunderstorm

drizzle

.

ice or snow pellets

lightning

cloud development not observed

slide28

Combining symbols tells more of the detail.

intermittent rain, slight at time of observation

continuous rain, slight at time of observation

continuous rain, moderate at time of observation

intermittent rain, moderate at time of observation

intermittent rain, heavy at time of observation

continuous rain, heavy at time of observation

slide30

highclouds

middleclouds

pressure

Temp

change

shown

visibility

wxnow

trend

lowclouds

dewpt

The visibility is especially important for pilots.

low or middle cloud cover

Visibility is given in miles and fractions

slide31

highclouds

middleclouds

pressure

Temp

change

shown

visibility

wxnow

trend

lowclouds

low or middle cloud cover

dewpt

PAST

The past weather uses symbols.

,

*

slide32

highclouds

middleclouds

pressure

Temp

change

shown

visibility

wxnow

trend

lowclouds

low or middle cloud cover

dewpt

PAST

when

Time precipitation began or ended

Coded for how many hours ago the precipitation began or ended. Again, the code is close to the number of hours.

slide33

highclouds

middleclouds

pressure

Temp

change

shown

visibility

wxnow

trend

lowclouds

low or middle cloud cover

dewpt

PAST

when

base

Height of cloud base

Coded height of base of clouds. Important for pilots.

slide34

highclouds

middleclouds

pressure

Temp

change

shown

visibility

wxnow

trend

lowclouds

low or middle cloud cover

dewpt

PAST

when

base

The amount of precipitation

amount

Amount of precipitation is plotted in inches to the nearest hundredth of an inch.

slide35

Decode this station.

237

,,

75

-

1

12

65

6

3

4 36

slide36

yes

any low clouds?any middle clouds?any high clouds?amount of low and middle cloudsheight of cloud basevisibilitybarometric pressuretrend in pressurepressure three hours agohow has pressure changedpresent weatherpast weatherwhen precipitation began/endedamount of precipitation

yes

237

,,

75

yes

-

1

12

6

4

65

6

3

1 mile

4 36

1023.7 mb

falling

1024.9

down then steady

temperaturedew pointwind directionwind speedamount of sky cover

75

continuous slight drizzle

65

rain

south

4

25 knots

.36”

80%