Summer Convective Weather Criteria

The following are listed in order of importance.
Items marked with *** are "aloft conditions" and must be reported via direct phone to the National Weather Service or amateur radio communications.
All other criteria items may be reported via amateur radio or social media.

Severe Criteria:


1.

Tornado (Waterspout if event is known to be on a body of water) ***

 

-

include the general direction that spotter is looking using the 16-point compass format (North-Northeast, South-Southwest, etc.) in addition to the spotter’s location

 

 

2.

Funnel Cloud ***

 

-

include the general direction that spotter is looking using the 16-point compass format (North-Northeast, South-Southwest, etc.) in addition to the spotter’s location

 

3.

Rotating Wall Cloud ***

 

-

confirm that it is rotating

 

-

include the general direction that spotter is looking using the 16-point compass format (North-Northeast, South-Southwest, etc.) in addition to the spotter’s location

 

4.

Severe Damage

 

-

tree branches greater than 3” dia. snapped, trees uprooted

 

 

-

any structural damage to buildings (includes roof damage)

 

 

-

bent, snapped or collapsed light poles or traffic lights

 

 

-

downed power lines

 

 

-

crop damage

 

 

-

cave-ins and mud slides

 

 

-

sink holes

 

 

5.

Severe Winds

 

-

58MPH OR HIGHER

 

 

-

indicate if speed is measured or estimated, but measured is always preferred

 

 

6.

Severe Hail

 

-

1 INCH OR GREATER (in numeric values only)

 

 

-

indicate if hail size is measured or estimated, but measured is always preferred

 

 

7.

Severe Flooding

 

-

water over river banks or dams

 

 

-

roads, bridges, or railroads washed out

 

 

-

impassable or closed roads

 

 

-

water out of banks that causes property damage

 

 

- - - - - - - - - -

Minor criteria may be reported but is not as urgent as severe. Those criteria are:

 

Minor Criteria:


        8.    Minor Hail

                -    3/4 inch to 7/8 inch

                -    indicate if hail size is measured or estimated, but measured is always preferred

                -    anything less than 3/4 inch should not be reported unless asked to do so


        9.    Minor Damage 

                -   any cosmetic damage to buildings or vehicles

                -    tree branches less than 3" dia. snapped causing power line damage or cosmetic damage to buildings & vehicles


        10.    Minor Flooding

                -    non-life threatening / non-damaging water over curb

                -    water out of banks but confined to low lands and bottom lands (not impacting buildings)

                -    water on roads


        11.    Visibility

                -    less than 1/2 mile

                -    indicate if due to precipitation, fog, blowing dirt or smoke


        12.    Rainfall

                -    measured amounts equal to or exceeding the rate of 1/4" per 15 minutes

                        measured over at least 15 minutes (i.e., a measured rate greater than 1" per hour)


        13.    Minor Winds

                -    40 to 57 mph

                -    indicated if wind is measured or estimated, measured is preferred

                -    anything less than 40 mph should not be reported unless asked to do so


            For additional information on reportable criteria, click this link. www.sulcom.info/summer_procedures/criteria/criteria.htm

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