Four persons were killed when strong winds and rains hit parts of Gujarat as a result of a cyclonic storm in the Arabian Sea.

The cyclone is just over 250km off the costal town of Veraval in Saurashtra region, official sources said in Ahmedabad on Monday.

A woman and her son were killed when a tree fell on them in Kothiya village of Bharuch district. A man died when a tree fell on him at Vishwamitri Majalpur Road in Vadodara city, the sources said.

One person died when lightning struck him and another was injured in the same manner while fishing at Uno Dam, reports from Jamnagar said.

"The cyclone, which is just about 250km south off Veraval, does not have much damaging potential," state Meteorological Director R K Kankane said.

The government is monitoring the cyclone, which is moving 60-70 km/hour and is likely to have a landfall point by Monday night, the officials said.

The cyclone could cause heavy rains in southern regions of Rajasthan, a state Met office source said in Jaipur.

The cyclone could weaken over the state, but rains could occur in Udaipur and Jodhpur divisions.

But severe heat wave conditions will prevail in the rest of the state, the source said.

Mumbai will witness a light drizzle and stormy winds.

Deputy Director General of the Meteorological Department, S Kumar, said, "In what direction the cyclone will move, what its speed will be… these things define the effect of the cyclone.  But sometimes cyclones change their direction and speed, and also become consistent."

On Sunday the Met department had recorded 1cm rainfall in Mumbai.

But this rainfall did not indicate the onset of monsoon, Kumar said, "Monsoon in Mumbai will start on its own time, which is June 10."

With Inputs from Vijay Singh