Natural Hazards Weekly — 2026-04-26
TITLE: Natural Hazards Weekly — Tornado warning in North Texas, Typhoon Sinlaku declaration for CNMI, Southeast fire siege
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Severe Weather
The headline event is an active tornado outbreak across North and Central Texas late on April 25. NWS Fort Worth issued a Tornado Warning for Parker County (9:55 PM CDT, until 10:30 PM CDT) on an observed circulation, nested inside a much broader Tornado Watch running until 11:00 PM CDT covering 21 counties across the Dallas–Fort Worth metroplex and adjacent rural areas, including Dallas, Tarrant, Denton, Collin, Grayson, Hood, Johnson, and Somervell. Emergency managers in the watch box should expect overnight damage assessments through the morning of April 26.
- A Severe Thunderstorm Warning from NWS Omaha covered Johnson, Nemaha, Pawnee, and Richardson counties in southeast Nebraska through 10:30 PM CDT on April 25, with observed severe criteria — part of the same frontal system driving the Texas tornado activity.
- NWS Tulsa issued a parallel Severe Thunderstorm Warning for Washington County, AR and Adair/Cherokee counties, OK until 10:30 PM CDT on April 25, with Special Weather Statements extending the impact zone into Sebastian, Crawford, Le Flore, and Sequoyah counties along the Arkansas–Oklahoma line.
- NWS Topeka issued a Special Weather Statement for Clay, Riley, Pottawatomie, Dickinson, and Geary counties in northeast Kansas, marking the northern flank of the same convective complex.
- On the fire-weather side, NWS El Paso/Santa Teresa posted Red Flag Warnings through 8:00 PM MDT on April 26 covering the Capitan and Sacramento Mountains, southwest New Mexico mountains and lowlands, the southern Rio Grande Valley, and El Paso/Hudspeth counties — critical conditions that align with active fire declarations in the Southeast.
Seismic
A quiet week domestically. The largest event globally was an M4.2 near Walenstadt, Switzerland — locally felt but below damage thresholds. No M4+ events struck the United States or its territories.
- Domestic seismicity was dominated by background activity: Alaska (M3.4 west of Karluk; M2.3 near Susitna North), Nevada swarm activity near Mina (M2.4, M2.1) and Silver Springs (M1.8), Geysers geothermal (M1.0), Permian Basin induced seismicity near Toyah, TX (M1.8, M1.5), and Kīlauea-area microseismicity at Volcano, HI (M1.9). Nothing requiring response coordination.
Federal Declarations
The most consequential federal action this week is DR-4910, a Major Disaster Declaration for Super Typhoon Sinlaku in the Commonwealth of the Northern Mariana Islands, declared April 23 for the incident period April 11–18. The declaration covers all five CNMI municipalities — Saipan, Tinian, Rota, Northern Islands, and the Northern Mariana Islands county-equivalent — opening Public Assistance and recovery programs across the territory.
- A wave of Fire Management Assistance Grants hit the Southeast as the spring fire season peaks: DR-5632 (Cow Creek Fire, Levy County, FL, declared April 23); DR-5631 (Railroad Complex Fire, Putnam and Clay counties, FL, declared April 22); DR-5630 (Highway 82 Wildfire, Brantley County, GA, declared April 22); and DR-5629 (Pineland Road Wildfire, Echols County, GA, declared April 21) — four FMAGs across Florida and Georgia in three days, signaling sustained drought-driven fire activity along the I-10 corridor and South Georgia pine belt.