National Weather Service

Built World

Identifies the threat areas that trigger siren activation

Grand Rapids' 27 outdoor warning sirens now sound only within a mile of the area the National Weather Service flags as a threat, instead of all at once across the city. The first test under the new year-round schedule is at noon Friday, Nov. 6.

Updated 5 days ago

Built World

As of September 2026: Issuer of the heat advisory

The heat advisory covering the Bay Area and Central Coast runs through Thursday at 10 p.m., with inland highs expected to hit 105°F. A Spare the Air alert for Wednesday warns of unhealthy smog, and a red flag warning for fire risk is in effect overnight.

Updated Sep 10

Built World

As of May 2026: Blizzard warnings extended through Feb 23 evening for NJ, DE, southeast PA including Philadelphia

A nor'easter developed into a bomb cyclone on February 22-23, 2026, burying the Interstate 95 corridor from Philadelphia to Boston under 1 to 2 feet of heavy, wet snow. In parts of New Jersey, totals exceeded 2 feet; Lyndhurst received 30.7 inches while New York City got 19 inches on February 24.

Updated May 29

Force in Play

As of May 2026: Issued warnings prior to Colorado crash

Four people died and 29 were hospitalized when 85-mph gusts on February 17, 2026 created a zero-visibility 'brownout' on Interstate 25 near Pueblo, Colorado. A 36-vehicle pileup including seven semi-trucks killed a father and son from Walsenburg and two women from nearby communities.

Updated May 29

Force in Play

As of May 2026: Issuing winter storm warnings across 2,000-mile stretch

Winter Storm Fern killed over 150 people by early February 2026, following 106 deaths on January 28. The storm brought ice and heavy snow across a 2,000-mile path from Texas to Maine, prompting President Trump to declare federal emergencies in 10+ states as peak power outages exceeded 1 million, 14,000+ flights were canceled (the worst aviation disruption since COVID-19), and wind chills dropped to minus 50°F. Fatalities came from hypothermia, traffic accidents, and ice-related incidents: Tennessee reported 29 deaths, Mississippi 28, Louisiana 8, New York City 8 people frozen outdoors, with additional deaths in Kentucky and in Texas where 3 boys drowned after falling through pond ice.

Updated May 26

Built World

As of May 2026: Issued winter storm warnings for Northeast region

Central Park got 4.3 inches of snow on December 27—the most since January 2022. But the chaos didn't end when the snow stopped: over 4,400 flights were canceled across the weekend, with JFK, Newark, and LaGuardia accounting for half. On Sunday alone, another 700 cancellations and 8,000 delays rippled through the system as airlines struggled to reposition aircraft and crews during one of the busiest travel weekends of the year.

Updated May 16

Built World

As of May 2026: Issued wind advisories and post-storm hazard messaging, including icing risk

Connecticut's December windstorm played out the familiar script: a fast-moving system brought damaging gusts and rain on December 19, toppling trees onto distribution lines and knocking out power to more than 50,000 customers. By Sunday evening, crews had restored service to all but 166 customers, clearing more than 190 blocked roads in the process—a textbook three-day restoration cycle.

Updated May 15

Built World

As of May 2026: Issuing Red Flag and High Wind warnings that trigger PSPS decision-making

Xcel Energy's deliberate blackout on Colorado's Front Range didn't end neatly when the wind eased. By the time crews could start patrols, the first PSPS was entangled with widespread storm damage. Xcel said total weather-related outages reached about 120,000—far beyond the roughly 50,000 customers initially targeted for de-energization.

Updated May 15