Your SlideShare is downloading. ×
Radar
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×

Introducing the official SlideShare app

Stunning, full-screen experience for iPhone and Android

Text the download link to your phone

Standard text messaging rates apply

Radar

1,244
views

Published on

Meteorology and radar images

Meteorology and radar images

Published in: Technology, Education

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
1,244
On Slideshare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
123
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Weather Radar John Harris - Head of Geography - Radley College [email_address] http://geography.radley.org.uk
  • 2. What is radar?
    • Electro-magnetic waves are sent out.
    • Signals ( echoes ) bounce back from targets eg rain droplets.
    • This can show the distance, size and velocity of the targets.
    • Weather radar detects echoes from water droplets in rain clouds.
    • Computer software processes and maps the data.
    Radar = radio detection and ranging
  • 3. National radar networks Many countries have set up weather radar networks to help weather forecasting and rainfall prediction.
  • 4. Radar maps Can you identify the country?
  • 5. What do radar maps show? Radar Reflectivity (dBZ) Type of precipitation Rainfall rate 0-30 dBZ Light rain up to 3 mm/hr 30-45 dBZ Moderate rain 3-25 mm/hr 45-55 dBZ Convective storm 25-100 mm/hr +55 dBZ Severe storm +100 mm/hr Larger droplets have higher radar reflectivity values ( dBZ ). These dBZ values can be mapped with different colours. Data can also be mapped as rainfall rates - mm per hour. Several images can be looped to make radar movies.
  • 6. Hawaii radar Where is the rain mainly falling? How much rain is falling (mm per hour)?
  • 7. Japan radar - forecast A band of rain can be seen to the west of Japan. Question: Assuming a westerly wind what is your forecast for Japan over the next few hours? Answer: wet and windy!