Natural Hazards Weekly — 2026-07-10

TITLE: Natural Hazards Weekly — Typhoon Bavi declarations, Midwest flash flooding, quiet seismic week (2026-07-10)

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Seismic

The past week's seismic signal was notably quiet across the U.S. monitoring network. The only M4+ event on the wire was M4.5 offshore 123 km SSW of Isangel, Vanuatu — deep in the Pacific, no tsunami threat, no domestic impact.

• Domestic activity was limited to a scatter of microseismic events (all M1.8 or below) across the Permian Basin of West Texas (Coyanosa, Toyah), the Geysers geothermal field and Big Bear/Cabazon in California, and interior Alaska (Chickaloon, Cantwell, Tatitlek). None warrant public advisories, though the Permian cluster remains consistent with the ongoing wastewater-injection-linked background trend.
• No felt reports, no structural damage, no state seismic activations this cycle.

Severe Weather

Flooding dominated the alert board Friday morning, with an active corridor from eastern Iowa through Missouri and into the Ohio Valley.

• Flash Flood Warnings are in effect until 1:00 PM CDT across Iron, Madison, St. Francois, and Washington counties in southeast Missouri (NWS St. Louis), with heavy rainfall observed and additional runoff likely — the most acute severe-weather threat in the country at issuance time.
• A Flood Warning runs through 5:00 AM Saturday for Black Hawk, Bremer, and Butler counties in northeast Iowa (NWS Des Moines), with flooding already observed; overlapping multi-day Flood Watches extend the concern through Monday afternoon as additional rounds move through.
• NWS Pittsburgh has a broad Flood Watch through 10:00 PM EDT covering ~25 counties across western Pennsylvania and eastern Ohio (Allegheny, Westmoreland, Beaver, Tuscarawas, Belmont, and neighbors) — a large geographic footprint worth monitoring for urban and small-stream flooding.
• Air-quality alerts are posted across western Colorado (NWS Pueblo and Grand Junction) covering Pueblo, Custer, and the San Juan/Uncompahgre counties (Ouray, Montrose, Dolores, San Miguel, San Juan, Hinsdale) through Saturday morning — consistent with regional wildfire smoke transport.
• A brief Nashville-area Flood Advisory and a system test message are noted but non-actionable.

Federal Declarations

FEMA activity this week was headlined by the Marianas typhoon response and a new Colorado fire assistance grant.

• DR-3648 (Emergency Declaration, Guam) and DR-3647 (Emergency Declaration, Commonwealth of the Northern Mariana Islands — covering Saipan, Tinian, Rota, and the Northern Islands municipalities) were issued 2026-07-02–03 for Typhoon Bavi, opening federal assistance channels across the U.S. Pacific territories in the storm's immediate aftermath.
• DR-5644 (Fire Management Assistance, Lake County, Colorado) was declared 2026-07-05 for the Willow Fire, authorizing federal cost-share for suppression operations.
• DR-4924 (Major Disaster Declaration, Missouri) was amended 2026-06-30 to add Howard, Monroe, and Ripley counties to the April 23–28 severe storms, tornado, and flooding event — extending Individual and Public Assistance eligibility deeper into north-central and southeast Missouri.