Some randomness summations....
1) Lightening. No. Had to be "heat lightening" as the weather was clear in Mariposa.
All 4 by random lightening strike? No.
Mariposa, California Long Range Weather Forecast: 2021-08-15
2) Trail is a roughly 7 mile loop or if down and back up .... a 7 mile trek. I measured a 1400 foot elevation change on Google maps. That difference equals at least here in PHX and the desert, about a 10 degree difference in heat. 107 easily at bottom.
3) As you can see from Google maps topography base there is virtually no shade along the switchbacks they were found. If it was down and back up on that section, they were only in shade at top and very bottom. (I believe a Fire - Ferguson has been mentioned - and it certainly seems like that from the map.)
4) A baby in 100+ degrees for hours? Nobody intentionally leaves a baby in a car for more than a few minutes because everyone knowns how extremely dangerous it is even for a short while. Same goes for outdoors-no shade.
5) Still going for Dog ill or dehydrated. trying to carry dog and baby. Perhaps Baby loses consciousness/expires. Exhausted and grief stricken its too late, they can't move and are in and out of consciousness.
[BTW I have experienced heat exhaustion/early heat stroke and got nauseated but never vomited. Very dizzy, "out on your feet" is a good description, agitated. THE BEST REMEDY IS ICE or INSTA PAC TO THE NECK. You need to cool the blood to the brain. Get in shade or make some with clothing or ??? Water or wet toweling off the skin to lower the body temp and top of Head. You lose heat through your head, so it gets hottest. Get a breeze going by fanning yourself. Watch for EXCESSIVE sweating as that is an indicator that your body is starting to work overtime to cool itself.]
According to the CDC, the following individuals are most at-risk for a heat stroke:
- Infants and young children
- People 65 years of age or older
- People who are overweight
- Individuals who overexert during work or exercise
- People who are physically ill, especially with heart disease or high blood pressure, or who take certain medications, such as for depression, insomnia, or poor circulation
- People traveling from cooler climates to drastically warmer climates
6) It sounds odd but making that an overnighter with a stay in the shade along the river in the PM (despite the heat) might have worked out.
OR (don't mean to be funny here)
7) Murder suicide by an adult poisoning the water they were drinking....
Awaiting toxicology like everyone else!