tahoe douglas fire district says the threat of roof collapses are increasing this season. luckily, the home was vacant at the time. >> in total, the rooftop was holding 240,000 pounds. it happened in a split second. this was a sudden collapse. if someone was in the structure there would most likely have been a fatality. >> firefighters say one of the biggest hazards is snow blocking propane tanks because if there is a gas leak, there is potential for an explosion. >>> sky drone 5 giving us a look at the so-called glory hole in napa county. the funnel-shaped drain is located near the dam, anytime water rises to a certain level, the spillway is open, creating a whirlpool effect. >> isn't that a sight to behold? i have not seen anything like that in 10 years. it made the dam a tourist spot after that. take a look at this, our live weather camera, looking out from the transamerica pyramid in an easterly direction. you can even see the island, can you see it there? just to the side of the embarcadero. i think i could even hear the parents this afternoon. temperatures up to 70 i

tahoe douglas fire district says the threat of roof collapses are increasing this season.kily, this home was vacant at the time. >> the total of this rooftop, probably holding about 240,000 pounds. it happened in a split second. it was a sudden collapse. if someone was in the structure, there would most likely be a fatality here. >> one of the biggest hazards is snow blocking propane tanks. because if there was a gas leak, there is potential for an explosion. >>> sky zone five, giving us a remarkable look at the so- called glory hole in layer bariesta in napa county. >>> the funnel-shaped hole is located near the monticello dam and any time the water rises to a certain level, the circular spillway is opened creating a whirlpool effect. >>> two earthquakes hit southern california, the first happened late last night near loma linda, a 3.6 magnitude quake. the second one happened minutes later near banning. this one was a 3.0 magnitude. and there haven't been any reports of any damage. >>> the holdup on electrification, cal train officials are in washington, d.c. today. comin