Natural Hazards Weekly — 2026-06-01
TITLE: Natural Hazards Weekly — Plains squall line, KY winter-storm declaration expands, quiet seismic week
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Seismic
The week was seismically quiet across the feed, with no damaging events. The two largest signals were both offshore and modest: M4.9 southeast of Easter Island in the South Pacific and M4.4 in Japan's Izu Islands region — both at depths and distances unlikely to produce onshore effects, and no tsunami threshold was approached.
Domestic activity remained at background levels. The Geysers geothermal field in northern California logged its usual swarm of micro-events (M0.2–M1.1), consistent with induced seismicity from steam extraction rather than tectonic stress. A pair of small events near Pāhala, Hawaii (M2.3, M2.6) fits the ongoing deep-mantle swarm pattern beneath the south flank of Kīlauea that USGS has tracked since 2019. A M1.9 near Hilltop, Texas continues the Permian Basin's wastewater-injection signature, and minor events near Joshua Tree and Little Lake, CA were unremarkable for the Eastern California Shear Zone.
No M4+ events struck CONUS this week — a notable but not unusual lull.
Severe Weather
A coherent overnight squall line drove the bulk of NWS activity in the early hours of June 1, with at least nine Severe Thunderstorm Warnings issued between 12:23 and 12:28 AM CDT across a Kansas–Missouri–Iowa corridor. All were "Observed" / "Immediate" tier, indicating ground-truth reports of damaging wind or hail rather than radar-only signatures.
- The leading edge swept eastern Kansas — Chase, Woodson, Lyon, and Allen counties under Wichita and Topeka WFOs — before crossing into the Kansas City metro, where the NWS Pleasant Hill office warned Leavenworth and Wyandotte counties in KS plus Clay, Jackson, and Platte counties in MO until 1:00 AM CDT, putting roughly 1.5 million metro residents under active warning overnight.
- The northern flank of the same complex produced concurrent warnings in western Iowa — Harrison, Shelby, and Woodbury counties — issued by NWS Omaha/Valley and Sioux Falls, with the longest-running cell over Woodbury County extending to 1:15 AM CDT.
- A NWS test message for Montgomery (origin office unspecified) was transmitted at 05:28 UTC and is noted here only to flag it as non-operational traffic.
No tornado warnings, flash flood emergencies, or hurricane products appeared in this cycle.
Federal Declarations
FEMA's only new activity this week was an expansion of DR-4913, the Kentucky Severe Winter Storm declaration covering the January 23–27, 2026 event. The amendment dated 2026-05-29 adds ten additional counties to the eligible roster: Lee, McCreary, Jackson, Clay, Allen, Laurel, Clinton, Cumberland, Barren, and Menifee. These counties — concentrated in southern and south-central Kentucky — are now eligible for Individual Assistance and/or Public Assistance under the existing declaration, four months after the incident period closed. The pattern (a late-spring amendment broadening a winter declaration) typically reflects completed damage assessments rather than new damage.
No new major disaster declarations, emergency declarations, or fire management assistance grants were posted in the window covered. Full record at https://www.fema.gov/disaster/4913.