RALEIGH — A frost advisory is in the forecast for Thursday morning, and Friday night could bring temperatures below freezing.
The National Weather Service said Friday may bring the coldest temperatures since April, and a sure-fire sign of fall Canadian high pressure is in the forecast to explain the source of coming cold air.
The frost warnings are posted from 5 a.m. to 9 a.m. Thursday.
Temperatures overnight were expected to be in the mid-30s in the western Triangle and the upper 30s elsewhere.
Highs on Thursday are forecast to be in the upper 50s and nighttime lows a little warmer than Wednesday night.
Then comes the cold, with forecast of readings in the upper 20s in Orange County and a low around 30 elsewhere.
The cold air is not out of line, according to Weather Service records, which say the region gets its first freeze of the fall, on average, between Oct. 21 and 31.
The record lows at Raleigh-Durham International Airport were 26 degrees in 2001 for Thursdays date and 27 degrees in 1940 for both Oct. 25 and 26.