IMD has issued heavy to extremely heavy rainfall warning for various parts of Maharashtra till 15th June. The rainfall warning is divided into various categories. Red Alert (Extremely heavy rainfall at isloated places) and Orange alert (heavy to very heavy rainfall at few places)On 11th June Raigad and Ratnagiri are on Red alert. Palghar, Thane, Mumbai and Bhandara are on Orange alert.On 12th June Raigad and Ratnagiri are on Red alert and Palghar, Thane, Mumbai, Sindhudurg, Gadhchiroli and Bhandara are on Orange alert.On 13th June Mumbai, Thane, Raigad, Ratnagiri are on Red alert and Palghar, Sindhudurg, Pune, Kolhapur, Satara, Chadrapur and Gadhchiroli are on orange alert.On 14th and 15th June Mumbai, Thane, Palghar, Raigad, Ratnagiri, Sindhudurg, Pune, Kolhapur, Satara are on Orange alert.Keeping the heavy rainfall alert in mind, NDRF has deployed teams in the state's coastal areas. 02 teams in Palghar, 02 in Thane, 02 in Raigad, 06 teams in Sindhudurg, 03 teams in Mumbai.On 10th June, Southwest Monsoon today has covered the entire state of Maharashtra.For Friday till 07 pm, IMD has issued a nowcast warning stating that thunderstorm accompanied with lightning and moderate to intense spells of rain with gusty winds reaching 30-40 kmph is likely to occur at isolated places in the districts of Palghar, Thane, Mumbai Raigad during next 3 hours. Possibility of hail at isolated places. Take precautions while moving out. Don't stand nearby large trees.K S Hosaliker of IMD in his tweet warned that this could be the longest spell.Dr Jayant Sarkar, DDGM, IMD Mumbai told Mirror Now, "This rainfall stretch of 05 days is going to be long spell. This is the result of low pressure formation in Bay of Bengal resulting into high strengthening of westerly winds causing this long rainfall spell."