Bringing massive relief from a punishing summer, the Southwest Monsoon officially made its onset over Madhya Pradesh and Gujarat on Wednesday. The arrival ends a tense nine-day delay, as the normal onset date for both states is June 15.

According to data from the India Meteorological Department (IMD), the monsoon currents have gained rapid momentum and are projected to sweep across the remaining parts of the central region within the next four days. With this latest advancement, the monsoon has now established its footprint across 22 states, keeping it on track to cover the rest of the country by July 5.

Northeast Devastated: Fatal Flash Floods in Arunachal

While central India celebrated the arrival of rain, extreme weather turned tragic in the northeast. Continuous torrential downpours over the past week culminated in severe flash floods on Wednesday morning in Arunachal Pradesh.

The worst impact was recorded at the NEEPCO Project Colony in the Yazali Circle of Keyi Panyor district, where sudden rushes of water swept through residential zones. Local disaster management officials confirmed that three people are missing and feared dead, while more than 18 houses have suffered extensive structural damage. Emergency rescue operations are heavily hampered as several low-lying pockets remain entirely cut off under deep water.

Mumbai Deluged: Subways Shut Down Within 24 Hours of Delayed Arrival

The developments come just a day after the monsoon made a chaotic entry into Mumbai on Tuesday, missing its standard June 10 schedule by nearly two weeks. The financial capital was battered by intense cloudbursts almost immediately upon arrival.

Rainfall telemetry records gathered between 8:00 AM on Tuesday and 7:00 AM on Wednesday revealed staggering numbers. The Malvani Fire Station registered a massive 334 mm of rainfall, closely followed by the F/South Ward at 328 mm. At least 27 other automated weather stations across municipal limits logged rainfall figures bouncing between 200 mm and 300 mm.

The sheer volume of water triggered immediate urban flooding. Municipal authorities were forced to shut down the crucial Andheri subway due to severe waterlogging, throwing suburban traffic into disarray. Structural damage was also reported from Vikhroli West, where a retaining wall flanking a residential complex gave way. Dozens of uprooted trees were reported by the civic body, crushing parked vehicles across multiple neighborhoods.

Rajasthan Receives Excess Rain; Heatwave Stubbornly Persists Elsewhere

In contrast to the delayed onset elsewhere, Rajasthan has unexpectedly logged a major rain surplus this pre-monsoon season. Between June 1 and June 21, the desert state recorded 39.3 mm of rainfall against its historical average of 28 mm—marking a 41% excess.

Meanwhile, parts of northern and eastern India witnessed volatile atmospheric transitions. A massive dust storm cut through Delhi-NCR on Tuesday afternoon, dragging visibility down sharply and creating twilight-like conditions during peak daylight hours. Heavy dust storms with winds peaking at 60 kmph also rattled six cities in Uttar Pradesh.

Despite the advancing monsoon wall, the IMD has maintained a severe heatwave warning. Temperatures crossed the 40°C threshold on Wednesday across major pockets of North and Central India. Banda in Uttar Pradesh emerged as the hottest spot nationally at 43.3°C.

IMD Weather Forecast Warning

The weather office has mapped out the following alerts for the next 48 hours:

Local administrations in the orange-alert zones have been advised to keep disaster response teams on standby, while residents in the heatwave belt are urged to minimize direct sun exposure as the monsoon slowly fights its way north.