We haven't had this problem, but here are a few things to try, based on the fact that your system was in some severe weather.
As a matter of technique, make sure the antenna hasn't moved or parts haven't loosened. Also, check the signal strength and the cross-polarization values. You should make note of what the typical, and acceptable, values are for your location and satellite.
Make sure you undo all connectors that were subject to the weather, including the one that is on the LNB, even if it was under cover, noting whether they were loose to begin with. Dry them off (a hair dryer will do the job) and reconnect them. Don't snug them down too tightly, but make sure the cable does not wiggle or turn. The connectors should be the weatherproof type, not the standard ones you find inside on the tv cable.
If they were loose or damp, then I would suggest using some of the rescue tape, a self-fusing silicon rubber tape, to wrap the connectors after you put everything back together again. That will keep the moisture out and prevent them from loosening with vibration (although I hope your stick house doesn't have that kind of problem).
Also check the cables for any damage.
Bob
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