20 miles Orange Alert - Threat is probable.

30 miles Yellow Alert - Threat is possible.We suggest three-stage warning criteria consistent with the recommendations contained in NFPA 780: Safety, however, always should be the prevailing directive. And yes, safety and productivity sometimes are incompatible.

It is a case-by-case risk management decision. We also recommend waiting to resume activities 30 minutes after the last observed lightning or thunder, even though this protocol may seem excessively conservative in many situations ('we'll never get anything done under such strict guidelines'). For general situations, we recommend activating your lightning defense when thunder is first heard. Suspension of activities is very site-specific. Hear thunder? How much time is needed to get to shelter? Two to four minutes is suggested. The distances from lightning Strike A to Strike B to Strike C easily can exceed more than 6-8 miles. (Thunder and lightning always happen together - acoustic and electrical signatures.) You see lightning but don’t hear thunder? That particular lightning was beyond your hearing range. A very good detector already exists in all our brains: Hearing thunder indicates the accompanying lightning is within your hearing range. Network systems consisting of off-site information services are available in many places. Radio-Shack-type portable AM-FM weather radios. Lightning detectors vary in complexity and cost from large dedicatedĮquipment packages costing in excess of $150,000 to inexpensive $20 to $30 May help you with issues involving duty-to-warn, liability, or negligence issues. (Note there is no defense from a 'first strike' situation.) Detectors also may signal 'all clear' conditionsĪfter the lightning threat has passed. Lightning detectors can give notice to shut down dangerous operations This safety program should include an early detection and warning alarm Lightning hazards can be mitigated by advanced planning.

Best lightning detectors