Unseasonal Storms and Heatwaves Disrupt Global Weather Patterns
Unusually severe weather events have struck both South Asia and North America this week, highlighting extreme climatic anomalies. In southern Pakistan and north-west India, a rare storm system brought destructive conditions, while the western United States grapples with an intense, record-shattering heatwave.
Karachi Ravaged by Deadly Storms
On Wednesday, unseasonally wet weather battered southern Pakistan and north-west India, with heavy rain, thunderstorms, hail, and strong winds rolling in from the west. Karachi, Pakistan's largest city, suffered the worst impacts, recording over 50mm of rain and wind gusts reaching up to 60mph. The violent conditions led to widespread devastation, including collapsed walls, buildings, and a pedestrian bridge, alongside severe flooding and power outages across the metropolitan area.
Tragically, at least 18 people lost their lives, with many more injured. Most fatalities resulted from structural collapses, though other deaths were attributed to a fallen tree and a lightning strike. This storm is particularly unusual for the region, as the majority of annual rainfall typically occurs during the monsoon season between June and September. Karachi's average March rainfall is only 15.7mm, making this event a stark deviation from the norm.
Impact on Neighbouring Indian Regions
In neighbouring India, the provinces of Gujarat and Rajasthan experienced less intense but still disruptive storms. Most areas received no more than 15mm of rain, though Rajkot city recorded 38mm. While damage was minor, involving some power outages and harm to trees and buildings, local agriculture faces significant concerns. Farmers have raised alarms about potential crop damage and disruptions to impending harvests, which could have economic repercussions. Historically, March is one of the driest months in north-west India, with Gujarat averaging less than 1mm of rain and Rajasthan typically seeing no more than 5mm.
Record-Breaking Heatwave Engulfs Western US
Meanwhile, a severe heatwave has intensified across large parts of the western United States, with temperatures expected to peak on Friday and Saturday. This extreme weather event is driven by a meandering jet stream and an almost stationary area of high pressure, creating a heat dome effect. This atmospheric anomaly traps warm air from the south, which heats further under clear skies, leading to soaring temperatures.
Maximum temperatures across the south-west are widely exceeding 30C, about 10-15C above seasonal averages. On Thursday, Indio, California, recorded a scorching 42.2C, with many weather stations breaking March records. Phoenix, Arizona, is forecast to experience temperatures above 40C for three consecutive days from Thursday to Saturday, potentially shattering the city's March record and even surpassing April records. Denver, Colorado, is expected to see temperatures over 30C on Saturday, nearly 20C above average for this time of year.
This heatwave is anticipated to persist into next week and propagate eastwards, bringing exceptionally warm weather to much of the United States by the middle of next week. Such unseasonal heat poses risks to public health, agriculture, and infrastructure, underscoring the broader trends of climate volatility affecting regions worldwide.
