Please see the Nation Weather Service site for details:
The National Weather Service of the U.S. Commerce Department's National Oceanic and Atmospheric Administration, and cooperating organizations have established Skywarn Spotter Networks in order to secure critical information on severe local storms.
Skywarn is an effort to save lives during severe weather emergencies by expanding networks of spotters and by encouraging the widest possible participation in tornado warning programs. There is no way to stop tornadoes, and not all tornados show up on radar, but they can be seen. Lives can be saved. Only one instrument can detect a tornado or funnel with complete certainty the human eye. More concern, more spotters, more eyes are needed. lend us yours - learn Skywarn.
Skywarn Net Conditions and Colors
Three basic net operational conditions and
colors are currently in use for our weather/Skywarn Nets:
Condition Green is used during a THUNDERSTORM WATCH
or a TORNADO WATCH. During Condition Green, check-ins are requested. If
any severe weather is to be reported, the following should be included:
Condition Yellow is used during a THUNDERSTORM
WARNING. During Condition Yellow, check-ins are NOT requested; however
stations are encouraged to give reports of severe weather. If any severe
weather is to be reported, the following should be included:
Condition Red is used during a TORNADO WARNING. During Condition Red, check-ins are NOT requested; however stations are encouraged to give reports of severe weather. If any severe weather is to be reported, the following should be included:
A standby net may be used when conditions are not currently threatening Oakland County, however a net control operator is standing by to pass information.
Estimating Hail Size
Pea size: ¼” diameter
Marble size: ½” diameter
Dime size’ ¾” diameter
Quarter size’ 1” diameter
Golf ball size 1 ¾” diameter
Baseball size 2 ¾” diameter
Estimating Wind Speed (Miles Per Hour)
25-31 Large branches in motion; whistling telephone lines
32-38 Whole trees in motion; inconvenience felt walking against wind
39-54 Twigs break of trees; wind generally impedes progress.
55-72 Damage to chimneys and TV antennas; wind pushes over shallow rooted trees.
73-113 Wind peels surface off roofs; windows broken; mobile trailers pushed or overturned; moving automobiles pushed off roads.
113-157 Roofs torn off houses; weak buildings and mobile homes destroyed; large trees snapped and uprooted,
158+ Severe damage. Cars lifted off the ground.
IMPORTANT TELEPHONE NUMBERS
Oakland County Emergency Response and Preparedness: (248)858-5300
ARPSC Radio Desk: (248)858-5551
NWS Spotter Hotline: (800)808-0006
PROCEDURE FOR INITIATING SKYWARN NETS
SITUATION ONE: OAKLAND COUNTY ACTIVATES HAMS
Oakland County Michigan ARPSC - All Rights Reserved 2013