State Meteorological Centre issued a warning on Thursday, forecasting ‘heavy’ to ‘very heavy’ rainfall in some places in Uttarakhand for three days starting from July 21. The centre also forecast 'extremely heavy rainfall' at isolated places in the state on July 22. The wet spell would continue on July 23 and the intensity of the rain is likely to subside since July 24. The overall climate of the state on Friday is cloudy sky with possibility of light to moderate rain and thundershowers at many places.