National Weather Service United States Department of Commerce

NWS Phoenix SKYWARN/Storm Spotter Program

South-Central & Southwest Arizona and far Southeast California (Map)


When significant, or severe weather occurs anywhere within the Phoenix County Warning Area, the Weather Service turns to the SkywarnTM Spotter Network to obtain timely and accurate reports. This network is comprised of individuals or groups, generally associated with the following: 1) Emergency Service Organizations (Fire, Police, etc), 2) Volunteer Organizations and 3) Weather enthusiasts.  Spotters should be at least 18 years of age though exceptions can be made on a case by case basis with pre-approval needed.   

Even with sophisticated technology like radar and satellites, there are a variety of atmospheric phenomena that require the human eye to detect and/or confirm.  This information is called "ground truth" and is provided by trained weather spotters throughout the year.  When hazardous weather occurs, Spotters provide detailed eye witness descriptions of the conditions to the local National Weather Service office by means of the Web, email, phone, or amateur radio.  Spotters in Southern Gila, La Paz, Maricopa, Northwest Pinal, Yuma, Imperial (CA), and Eastern Riverside (CA) counties should report to the Phoenix forecast office.  Click here for a map.

Spotters should provide the following information:

  • WHO they are (Spotter ID)
  • WHAT they saw or are seeing,
  • WHERE they are or where they were when it was going on.
  • WHEN the reportable conditions were first observed.

Reporting Criteria

The following criteria are what spotters should report to the National Weather Service - Phoenix. 

  • Tornado (on the ground)
  • Funnel Cloud (tail NOT touching the ground)        
  • Storm Damage (deaths, injuries, broken tree limbs, shingles off roofs, etc.)
  • Flooding (streets, running washes, etc.)
  • Low Visibility (less than 1 mile due to dust, sand, fog, etc. - except rain)
  • Rotating Wall Cloud
  • Heavy Rainfall (measured ½ inch or more accumulation in 30 minutes or less)
  • Hail  (diameter of largest stone - any size)
  • Snow (accumulating or not)

Reporting Methods

Trained Spotters should utilize the methods outlined in the class (webpage, email, phone, radio).  For those who are not trained Spotters, you can send us a Tweet or post to our Facebook page. 

 


 

Training

To become a Skywarn Spotter for the NWS Phoenix office requires attending a free one hour training class. Our office conducts Spotter classes at locations throughout our forecast area.  Typically, this occurs during the March through May time frame. 

The classes teach people how to properly identify and report significant weather phenomena and thereby contribute to public safety.  You will learn about how thunderstorms work, how to identify cloud features associated with microbursts and tornadoes, and how your reports tie in to warnings and advisories issued by the National Weather Service (NWS).  In addition, you will learn about all of the services available from the NWS.  

Adult SKYWARNTM volunteers are community minded individuals who understand that they play a role in public safety by providing storm information to the National Weather Service.

If you have any questions, please contact either Austin Jamison or Marvin Percha at 602-275-7418 at the NWS Phoenix Forecast Office. 

*** We especially need new spotters in more rural areas of our forecast area (County Warning Area - CWA)***

 

Training Class Schedule (Webinars)

 

Open to residents of our forecast area (Map)

 

 

Date Time Registration Notes

April 27th

630pm-730pm

Full

Standard class (webinar)

May 6th

630pm-730pm

https://forms.gle/bDJDbJG6A4pLzbg3A

Standard class (webinar)

Gila County preferred

May 10th

630pm-730pm

https://forms.gle/4BYnKNmSAiFXmZT78

Standard class (webinar)

 

May 13th

630pm-730pm

https://attendee.gotowebinar.com/register/5929475307748054031

Standard class (webinar)

May 18th

630pm-730pm

https://forms.gle/KtCwwL3z8kdpo2x4A

Standard class (webinar)

 

May 24th

630pm-730pm

https://attendee.gotowebinar.com/register/687488751140110095

Standard class (webinar)

June 2nd

630pm-730pm

https://attendee.gotowebinar.com/register/7986018349015153423

Standard class (webinar)

June 4th

630pm-730pm

https://attendee.gotowebinar.com/register/6400791962111248655

Standard class (webinar)

June 11th

630pm-730pm

https://attendee.gotowebinar.com/register/2820707335410524941

Standard class (webinar)

June 17th

630pm-730pm

https://attendee.gotowebinar.com/register/6100143702888405259

Standard class (webinar)

June 21st

630pm-730pm

https://attendee.gotowebinar.com/register/4506857895753130765

Standard class (webinar)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Amateur Radio ("HAM" radio)

When a Skywarn Net has been activated for public safety purposes, trained Spotters who are amateur radio operators may submit storm reports by radio. There are also weekly routine Nets utilizing the same frequencies (see below).  These routine Nets are a good way to test how readily you can connect to those repeaters as well as practice interacting with a Net Controller. For questions specific to amateur radio, contact Marvin Percha (marvin.percha@noaa.gov). 

 

Maricopa and Pinal Counties - Sector 2:

  • 442.550 MHz (PL Tone 100.0)  --  The first Wednesday of the month at 8 pm

Southern Gila County - Sector 6 (can be reached in portions of East Valley)

  • 147.200 MHz  (PL Tone 162.2)  --  Tuesdays at 8 pm

Yuma and eastern Imperial Counties - Sector 7:

  • 146.780 MHz (PL Tone 103.5)  -- Tuesdays at 7 pm

 

Educational Resources

 

Study Guide for Standard Class (pdf 336KB)

 

PDF Version of Standard Class presentation (pdf 9.4 Mb)

 

PDF Version of Advanced Class presentation (pdf 17.2 Mb)

 

Spotter's Guide (pdf 27.2 MB):

 

JetStream - an Online School for Weather

 

Severe Weather 101 (educational content from NSSL)

 

MetEd (hundreds of online tutorials for the GeoScience community)

 

Radar Basics (pdf 7MB)

 

Radar Tutorials from NWS

  • Introduction to the WSR-88D system
  • Principles of Radar
  • Velocity Interpretation
  • Base and Derived Products
  • Convective Storm Structure and Evolution
  • Flash Floods
  • Winter Applications

 

NWS Norman Spotter Resources (emphasis on Great Plains severe weather)

  • Training Videos (informational - not a substitute for NWS Phoenix classes)

 

Severe Thunderstorm Forecasting (video lecture series by SPC forecasters)

 

NSSL’s HotSeat Warning Simulator

 


 

Additional Useful Links

 

Rainfall Data Sources

 

NWS Publications and Brochures 

 

Climate Sites

 

Drought Sites