RADAR Presentation

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Slide 1

Attention Students This presentation is posted for those who missed the day that Benson did this presentation and for those who want to review. It is best if you copy the notes from a classmate before viewing the presentation. The presentation works best if you download it to your computer before viewing. As go through the presentation, click on the hyperlinks (lime green). Obviously, some of the slides won’t make sense because you are not listening to the teacher as you are looking at them. IMPORTANT: If you were gone be sure to look at everything else that is posted on Benson’s web site at www.formontana.net/unit4.html

Slide 2

Doppler RADAR What is inside the sphere?

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Why not just put it inside a building? Rotates once every 6 minutes.

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RAdio Detection And Ranging RADAR? How do you think it was discovered that RADAR could work for weather?

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Which area has the most? NEXRAD TDWR Station is down

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NEXRAD system completed in 1999 Upgraded in 2011-2012

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Dual Pol NEXRAD

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National Weather Service Forecast Office Glasgow, Montana

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Date goes here. NEXRAD Great Falls, Billings., Missoula., Glasgow “Ground-Based” . . . Its on the ground, not on a satellite. . . Can be “mobile” 2 options (displays) 1. Reflectivity: shows where it is raining, etc. RADAR waves reflect off of snow, rain, etc. A “hook” shape indicates rotation (mesocylone) 2. Velocity: shows wind speed and direction in a thunderstorm Uses the Doppler Effect to detect rotation Current RADAR Image Doppler Radar

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The END Students be sure to carefully read this web page: www.fomontana.net/hook.html

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Near Great Falls NEXT Great Falls, Montana

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There is a problem with coverage in Helena. NEXT

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Another problem . . . Virga

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NEXRAD

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Back to NE Why are most meteorologists that work in Montana NWS offices from out of state?

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186,000 miles/second

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GOES East July 20 2001 7 pm

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http://formontana.net/swath.html

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3 pm 10 pm Great Falls . Glasgow Over $30 million in damages

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Havre North Dakota South Dakota Wyoming Glasgow BACK

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Tuscaloosa Tornado April 27, 2011 5:40 pm

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Tornado kills 2 in NE Montana July 2010

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Back to NE

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Billings

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NEXT: Malta

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Eastern Montana July 20, 2001 SW edge of storm X

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Reflectivity Mode Velocity Mode X BACK to NE

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D.O.W. BACK

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Types of Thunderstorms Single-cell “Isolated” Multi-Cell Cluster Called a “Mesoscale Convective Complex” Multi-Cell “Squall line” Can be several individual cells in a line Can be several MCCs in a line “Supercell” The most dangerous kind A single, huge thunderstorm (on steroids) Needs its “own space” NEXT

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May be 10 miles across BACK

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Reminders, etc. Friday is mid-term Test on Wednesday: STORMS Today StormPulse.com Finish watching TWISTER Watch for “Dorothy” Grade check during video Attendance 12-3-09

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Mesoscale Convective Complex a multicell thunderstorm (last at least 6 hours) BACK

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GOES East July 20 2001 7 pm BACK

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BACK

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BACK

Summary: For students who missed class.

Tags: earth science meteorology rod benson weather radar

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