Sarah Nilsson JD, PhD, MAS
Sarah NilssonJD, PhD, MAS
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Welcome to CoCoRaHS in Arizona


Become A Storm Spotter From Home


National Weather Service - Skywarn Weather Spotter


Field Guide

Reporting Procedures

Online Training


What to Report

- Flooding

Water that covers roads or threatens property


- High Winds

40mph - small trees sway

50mph - large trees sway

60mph - smaller tree branches break - up to 1 inch diameter

70mph - large tree branches break - 1 to 3 inches diameter

80mph - tree uprooted

100mph - large tree trunks snapped


- Blowing Dust

Reduced visibilities to one-half mile or less


- Hail

(Any Size)

Measure the diameter of the largest hail stone with a ruler


- Tornado

Swirling dust on the ground below a funnel cloud


How to Report

Phone: 1-888-745-1637


Twitter: @NWSFlagstaff

mPING app


CoCoRaHS - rainfall nework


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Contact Me

Sarah Nilsson, J.D., Ph.D., MAS


602 561 8665


You can also fill out my 

online form.




Get Social with Me

View Sarah J. Nilsson's profile on LinkedIn



Legal Disclaimer

The information on this website is for EDUCATIONAL purposes only and DOES NOT constitute legal advice. 

While the author of this website is an attorney, she is not YOUR attorney, nor are you her client, until you enter into a written agreement with Nilsson Law, PLLC to provide legal services.

In no event shall Sarah Nilsson be liable for any special, indirect, or consequential damages relating to this material, for any use of this website, or for any other hyperlinked website.



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I endorse the following products

KENNON (sun shields)

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