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The Lead: Unprecedented Snowpack Loss RevealedHigh above the jagged peaks of California's Sierra Nevada, specialized aircraft equipped with Lidar technology are revealing what the naked eye cannot see: record-breaking snowpack loss across the US West. This high-tech monitoring system, developed by NASA and now commercialized by Airborne Snow Observatories, is providing critical data as the Western US faces what experts call an "unprecedented" water crisis.The Technology: Precision Snow Measurement from AboveTom Painter, CEO of Airborne Snow Observatories, explains how his technology works: "The Lidar sprays out about 800,000 pulses per second," creating a 3D map of snow depth accurate to within 3cm. This precision measurement allows water managers to calculate exactly how much water is stored in the snowpack – the "frozen reservoirs" that supply water to millions of people and critical agricultural areas across the Western states.The Data Analysis: Record-Low Snowpack FiguresThe numbers are alarming. According to Climate Central, the total water stored in the Western snowpack this winter hit its lowest level on record right when it should have been hitting its annual peak. California's statewide snowpack stood at a mere 18% of average on April 1 and has continued declining since. More than 60% of the lower 48 states are now gripped by drought – the most widespread spring dry spell since monitoring began in 2000.The Impact Analysis: Water Security and Wildfire RisksThe consequences of this snowpack loss are twofold. First, early snowmelt means water is flowing into reservoirs months ahead of schedule, leaving Western states with a "really long dry season" when they need water most. Second, the landscape begins to dry out months ahead of schedule, dramatically increasing wildfire risks. Nevada's deputy state climatologist Tom Albright notes: "We wish we could tell it to stay put a little longer," as spring runoff from snowmelt is two months ahead of schedule.The Prediction: A New Normal for the WestWhile this year's drought is anomalous when looking at historical records, experts warn it may be a preview of the coming decades. "As we look forward this year will become less and less unusual and may become not unusual at all at some point in the future," Albright warns. The water systems of the West, built on the assumption that snow would remain in mountains until mid-summer, are being fundamentally rewritten by climate change, requiring new approaches to water management in an increasingly arid future.

The US has just wrapped up a historically warm March, with numerous states recording all-time high temperatures. This prolonged warmth has left much of the mountain snowpack in the American west at critically low levels, a crucial source of water for millions.Despite increased precipitation in spring, the low snowpack has raised concerns about a potentially severe wildfire season if conditions do not improve soon. With more abnormally warm, dry weather expected, the outlook is becoming increasingly worrying heading into late spring and summer.On the other side of the Pacific, Tropical Cyclone Maila has developed in the Solomon Sea and is expected to strengthen to severe tropical cyclone status. This is the first named storm for Papua New Guinea since Cyclone Guba in 2007. Maila is forecast to be the strongest storm to impact or make landfall in Papua New Guinea.Meanwhile, parts of south-east and east Asia are expected to see a continuation of abnormally high temperatures this week, with some areas potentially recording temperatures of 35-39C, about 10C hotter than expected for this time of year. High temperatures will be joined by very high humidity levels, potentially creating dangerous levels of heat stress for millions of people.