6 maps showing what to expect from the weather Friday and Saturday

Rain and quickly changing temperatures are coming to Massachusetts.

Cambridge, MA - 1/11/17 -  Cars splash through a flooded Cambridge Park Drive adjacent the Alewife MBTA station in Cambridge.  (Lane Turner/Globe Staff) Reporter:  (Billy Baker)  Topic: (12flooding)
–Lane Turner / The Boston Globe

There’s going to be a lot less snow on the ground by Saturday afternoon.

Heavy rain combined with melting snow from well-above-freezing temperatures that will remain Friday into Saturday has caused the National Weather Service to issue a flood watch for all of southern New England.

“Heavy rain is expected to overspread the region from west to east this afternoon and evening continuing at times into Saturday morning,” the agency said in its forecast for the region. “This combined with rapid snow melt will result in the possibility of some minor river and stream flooding along with the potential for isolated ice jam flooding.”

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Forecasters expect a high temperature of 61 degrees on Friday.

Flood-related hazards are an issue from Friday morning through Saturday afternoon:

Here’s a look at the rain’s timing and how much to expect:

 

 Saturday brings a drastic temperature change:

From 6 a.m. to 1 p.m. Saturday, Boston is expected to see a 34-degree drop in temperature.

“Any wet roadways will quickly freeze resulting in hazardous travel,” the service said.

The service warned to expect the development of black ice on roadways with the dramatic temperature change and flash freeze.

Snow, freezing drizzle, and sleet are possible in Boston Saturday night, according to the forecast. Sunday should be partly sunny with a high near 24.

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