1990 k75 won't start

I'm in the middle of a cross country trip and camped out in massive thunderstorms in eastern ohio last night. I woke, ready to get out of here, only my bike won't start. It's been running fine, but now, when I put the starter in position 1 and turn the key, instead of the lights coming on I get a sad wimpering sound and the clock fades away. Any ideas? I'd love to get out of here before the storm comes back. I had a rain cover on but it probably didn't do a ton to keep the deluge out. Could it be wet spark plugs?

Battery

Sounds like a dead battery.

Could also be bad connection at the battery or chassis ground.

See if you can get a jump. Positive to positive (battery terminal on left side of bike). Negative to frame (use frame bolt on left side of bike near shift lever).

Yep. Good call fellas. Jumped and on the road. Thanks.