Topband: Large thunderstorm areas as MF "wall"

[Mac ( py2cw )]

Hi folks
               Large electric activity (thunderstorm) areas acts like =
"barriers" to top band/MF dx sigs? This saturday night at cq ww we are =
(SA) facing stronger QRN and few dx sigs (present at cluster) compared =
to friday night.=20

Questions: A large thunderstorm area in the dx path is a factor for =
weaker sigs?
                Charged clouds "blocks" ground wave ? What is the =
mechanism ?=20

OBS. AM BC sigs from 60 mi stations frequently weaker in these =
situations.

                                                                         =
                       Mac/PY2CW




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