Thunder (Hearing)
Last Updated On: 10/30/13
When hearing thunder, one should say the Brocho: Shekocho Ugevuraso Malei Olam
The Brocho should only be said once a day unless the sky cleared, and then the storm started anew. If it is the next day the Brocho is said again (even if the sky did not clear).
Source: Siddur Tefillas Shlomo Hashalem (page 107)
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