If you do not plan on keeping the kittens, contact a shelter or the ASPCA. If you plan to adopt them out yourself, find a vet who may be willing to cut you a deal on vaccinations etc.
In the interim, do not give them cows milk, whatever you do. You need to buy special formula made for newborn kittens. Goats milk is okay too. Kittens can have serious complications if you give them regular cows milk. They need to be on this formula for at least 4 weeks, just about the time their mother would wean them. You can use a dropper to give them the milk. Check the website below for amounts. But as general rule 2-4 oz every 4-6 hours. Avoid overfeeding as kittens can easily get food in their lungs and develop pneumonia.
At about 4 weeks, start feeding them kitten chow softened in milk (special kitty milk). They can also start to have water. (No canned food! This too is bad for kittens and their metabolism. They can develop diabetes and other problems) By 6 - 8 weeks, switch them totally over to dry cat food.
Keep them warm as possible. Make a nice box with blankets or cedar chips and put it somewhere out of the open like under a porch or in a shed or garage where they can go in and out, and mom can find them if she comes back. The kittens are in real danger of hypothermia during the first two weeks. Considering the weird weather, consider a heating pad and a visit to the vet if necessary.
Watery, yellow stools or no stools at all are danger signs to watch for.
For more information on warning signs, and caring for kittens check out:
http://www.2ndchance.info/orphankitten.htm
http://www.tundraco.com/dlaweankit.html
Good luck.