Flash flooding caused traffic gridlock on the Great Western Highway at Kelso this morning.
Traffic heading into the city crawled to a standstill as one lane of the highway was shut following flash flooding from Raglan Creek.
Weatherzone is reporting that 20mm of rain has already fallen today, making today the wettest day of the month so far.
The Bureau of Meteorology issued a weather warning at 5.21am that said today's thunderstorms were likely to produce large hailstones, very heavy rainfall and flash flooding in the warning area over the next several hours.
More rain is expected over the weekend.
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