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for South Central and Southeast Wisconsin
Lightning Threat
Hazard Map Threat Levels Safety & Impact

Lightning Safety Rules
For Outdoors
Appoint someone to watch the skies during your outdoor work or recreation.  Check the latest thunderstorm forecast and monitor the NOAA Weather Radio. Employ the 30-30 Rule.
When lightning is in your vicinity, go quickly inside a completely closed building.  Do not consider carports, open garages, covered patios, or pavilions as adequate shelter.
If no closed building is convenient, get inside a hard-topped all-metal vehicle.
Do not take shelter under a tree, especially if it is tall and isolated.
squattingIf caught unprepared and away from adequate shelter, avoid being the tallest object in your immediate area.  Do this quickly, especially if you feel your skin begin to tingle or your hair stand up on end.  Crouch down on the balls of your feet out in the open (keeping twice as far away from the tallest object as it is high).  Avoid crouching in groups; spread out several yards from one another.
Get out of the water.  This includes pools, lakes, rivers, oceans, water rides, and even puddled water.  Get off the beach. 
Put down metal objects such as fishing poles, golf clubs, tennis rackets, tools. etc. 
Dismount from tractors and heavy construction equipment.  Do not seek shelter under the equipment. 
Move away from metal objects such as metal fences, metal sheds, telephone and power lines, pipelines, etc. 
For Indoors
Avoid contact with corded phones.
Avoid contact with electrical equipment or cords.  If you plan to unplug any electrical equipment, do so before the storm arrives.
Avoid contact with plumbing.  When thunderstorms are occurring, do not take a shower or bath, wash dishes, or do the laundry.  Wait until after the storm.
Move away from windows and doors.  Do not stay on the porch.
Lightning Strike Victims
Have someone call 911 immediately; get professional help on the way.
Determine if the victim is unconscious.  Call out their name or gently shake them.  If there is no response, check to see if they are breathing.  Gently roll the victim onto their back. 
If the victim is not breathing, you will need to perform CPR until the paramedics arrive.  Use the American Heart Association's "ABCs of CPR" to guide you through the process.
1. Airway: clear obstructed airways.
2. Breathing: perform mouth-to-mouth.
3. Circulation: start chest compressions.
The 30-30 Rule
Use the "30-30 Rule" to determine if there is a hazard of lightning in your vicinity.
30 Seconds
Count the seconds between seeing the lightning and hearing the thunder.  If this time is 30 seconds or less, then the lightning is close enough to be a hazard.  Seek shelter immediately. 
30 Minutes
After seeing the last lightning flash (or hearing loud thunder), wait 30 minutes before leaving your shelter.  More than one-half of lightning deaths occur after the thunderstorm has passed.  Lightning is the first thunderstorm hazard to arrive and the last to leave an area. 
Myth & Truth
Myth: Cars are safe because the rubber tires insulate them from the ground.
Truth: Rubber tires provide no protection from lightning.  Cars are safe because of their metal shell and steel frame.  Convertibles are not safe.

Myth: Lightning-strike victims are electrified and should not be touched.
Truth: Lightning-strike victims carry no residual electrical charge. It is perfectly safe to touch a lightning victim to give them first aid.

Myth: If it is not raining, then there is no danger from lightning.
Truth: Lightning often strikes outside of the rain area to as much as 10 miles (even greater distances in exceptional situations).

Myth: Heat lightning occurs after very hot summer days and poses no hazard.
Truth: Heat lightning is a term used to describe lightning from a thunderstorm too far away for the thunder to be heard.  The lightning hazard increases as you move toward the storm and   eventually the thunder will also be heard.

  • National Weather Service
  • Milwaukee/Sullivan, WI Weather Forecast Office
  • N3533 Hardscrabble Road
  • Dousman, WI 53118
  • 262-965-2074
  • Page Author: MKX Webmaster
  • Web Master's E-mail: w-mkx.webmaster@noaa.gov
  • Page last modified: 2-Nov-2005 10:23 PM UTC
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