The Weekly Volcanic Activity Report: June 25-July 1, 2026
New activity/unrest was reported for 5 volcanoes from June 25-July 1, 2026. During the same period, ongoing activity was reported for 22 volcanoes.
LaGuardia records highest midnight temperature on record as New York City heat wave persists
LaGuardia Airport recorded an official temperature of 34.4°C (94°F) around midnight into July 4, 2026, establishing the station’s highest midnight temperature on record as an intense heat wave affected New York City and much of the northeastern United States. According to National Weather Service observations, the reading surpassed the previous midnight record of 33.9°C (93°F) set on July 18, 2013. The National Weather Service maintained Extreme Heat Warnings across much of the New York metropolitan area as dangerous heat persisted through the overnight hours.
Super Typhoon Bavi strengthens into Category 5 as Guam, Northern Mariana Islands brace for possible catastrophic impacts
Super Typhoon Bavi reached Category 5 strength over the western North Pacific on Saturday, July 4, 2026 as it tracked toward the Mariana Islands. Forecasters expect the cyclone to pass very near Rota before moving between Guam and Saipan on Monday morning. Typhoon warnings have been issued for Guam, Rota, Tinian, and Saipan amid forecasts of destructive winds, life-threatening coastal inundation, widespread flash flooding and catastrophic damage early next week.
Adelaide hit by 70% of its July rainfall in one day as successive cold fronts bring flooding and damaging winds to South Australia
Heavy rain from successive winter cold fronts flooded roads and properties across South Australia during July 2–3, 2026, prompting hundreds of State Emergency Service (SES) call-outs, disrupting transport, triggering a statewide Code Blue response for vulnerable people and delivering more than 100 mm (3.9 inches) of rain to parts of the Mount Lofty Ranges, according to the Bureau of Meteorology (BOM) and the SES.
Typhoon Bavi forecast to approach the Mariana Islands as a Category 5 super typhoon
Typhoon Bavi rapidly intensified over the western North Pacific on Friday, July 3, 2026, increasing from 157 km/h (98 mph) to 194 km/h (121 mph) within six hours. The storm is forecast continue strengthening potentially becoming a Category 5 equivalent super typhoon by Sunday, July 5. Typhoon, tropical storm and flood watches remained in effect Friday across Guam and the Commonwealth of the Northern Mariana Islands.
Peru declares state of emergency ahead of 2026–2027 El Niño rains
Peru has declared a 60-day state of emergency in 796 districts across 22 departments and the Constitutional Province of Callao on July 2, 2026, because of the imminent threat of intense rainfall associated with the 2026–2027 El Niño phenomenon, activating nationwide preparedness and disaster risk reduction measures.
Anak Krakatau alert raised to Level III after renewed eruptions, Indonesia
Indonesia’s Geological Agency raised Anak Krakatau alert from Level II (Waspada) to Level III (Siaga) at 16:30 WIB (09:30 UTC) on July 2, 2026, after an eruption at 14:05 WIB (07:05 UTC) sent a dense gray-to-black ash plume about 200 m (656 feet) above the summit. The agency set a 3 km (1.9 miles) exclusion zone around the active crater.
Dangerous heat wave continues into July 4 as record temperatures spread across the eastern U.S.
A dangerous heat wave continued to intensify across much of the central and eastern United States on Friday, July 3, 2026. Numerous daily temperature records have already broken and more are expected through the Fourth of July holiday weekend. The National Weather Service (NWS) warned of widespread Major to Extreme HeatRisk and heat index values reaching 46°C (115°F).
Volcanic tremor reaches high levels, lava flow and Voragine activity continue at Etna, Italy
Effusive activity at Italy’s Etna volcano continued from a vent at 3 030 m (9 940 feet) elevation on July 2, 2026, feeding overlapping lava flows on the volcano’s eastern flank. Meanwhile, strombolian activity persisted at Voragine crater as volcanic tremor remained in the high range and a new infrasonic source developed beneath the crater.
Up to 250 mm (9.8 inches) of rain and 130 km/h (80 mph) gales forecast for parts of New Zealand’s South Island
A front preceded by a strong, moist north to northwesterly flow is forecast to bring up to 250 mm (9.8 inches) of rain to parts of New Zealand’s South Island and severe wind gusts up to 130 km/h (81 mph) in exposed parts of the Canterbury High Country from Friday, July 3, to Saturday, July 4, 2026.
