heat
THE AMERICAN HEAT BOARD — ZERO ADVISORIES, ZERO EXCESSIVE-HEAT WARNINGS, THE SUMMER SIGNATURE GONE
On the board · September 22, 2026 →
EASING · September 22, 2026 · NO. 0922
THE DOME
Zero heat advisories and zero excessive-heat warnings on the live national feed, and no heat headline in the short-range discussion: the column reads 0 alerts. The row stays on the board for one issue longer precisely because an empty count is a reading: the summer signature that dominated this board for months is resolved , and the American hazard has simplified to water . A zero that was checked is worth more than a category that was assumed.
THE RECORD
57 turning points on record since Jun 9 — the 8 most recent shown.
Sep 22 ▽ eased
Sep 21 ▽ eased sharply
Sep 20 building → easing
Sep 19 ↑ moved up the board
Sep 18 ↑ firmed
Sep 17 active → building
Sep 16 ▽ slipped down the board
Sep 15 ▽ eased
WHAT THEY'RE SAYING
searched 34 vetted voices and the open field — nothing said about this system cleared the screen.
SOURCES — AP and weather.com relays Aug 1-3 · CBS / Yahoo (125M alerts) · City of Philadelphia · Media relays Aug 1-3 · NBC10 Philadelphia · NOAA HeatRisk · NOAA WPC excessive-rainfall discussion, Sep 17 2026 · NOAA WPC short-range public discussion, 0452Z Sep 18 2026 · NOAA Weather Prediction Center Day-1 Excessive Rainfall Outlook 0056Z Sep 22 2026 and Short-Range Discussion 0623Z Sep 22 — a SLIGHT excessive-rain risk over the Central Appalachians, primarily West Virginia and south-west Virginia and expanding into northern North Carolina, with a localized 3-6 inches possible on saturated soil; a broad MARGINAL including south Florida; isolated flash flooding in eastern New Mexico, west Texas, eastern California and Nevada; the Day-1 flash-flood focus on the Ohio Valley, Mid-Atlantic, Southeast and Four Corners; and a broad MODERATE risk developing over much of eastern New Mexico on Wednesday. No winter, heat or tropical-remnant headline in this issuance. · NOAA Weather Prediction Center Day-1 Excessive Rainfall Outlook and Short-Range Discussion valid Sep 21-23 2026: a SLIGHT excessive-rain area over the Midwest and Ohio Valley plus the Northern High Plains with a broad MARGINAL, the discussion's emphasis on SATURATED SOIL rather than rainfall rate, and the flash-flood focus on the Appalachians and Mid-Atlantic Mon-Tue, New Mexico and west Texas Mon-Tue, and South Florida through Tue; cooler north and east; no significant winter or heat headline. excessraintext.php returned 404, so the figures come from the outlook graphic and the QPF discussion. · NOAA Weather Prediction Center, Short-Range Public Discussion, 0625Z Sep 19 2026: heavy rain and flash flooding greatest across the Midwest, Ohio Valley and Great Lakes Saturday, expanding into the Mid-Atlantic and North-east Sunday; a concentrated heavy-rain threat over Montana; isolated flash flooding over south Florida; record-challenging South-Central, lower-Mississippi-Valley and South-east heat in the 90s to low 100s °F near daily records. · NOAA Weather Prediction Center, Short-Range Public Discussion, 0632Z Sep 20 2026: excessive rain and flash flooding across the northern and central Rockies, the Plains, the Midwest, the Ohio Valley and the Mid-Atlantic through Sunday, especially where soils remain saturated from previous rainfall; the severe threat shifting into the central and southern Appalachians and the South-east on Monday; slow-moving downpours over south Florida through Monday; hot and humid conditions over the central and southern Plains, the Tennessee Valley and the lower Mississippi Valley, moderating northward. · NWS Extreme Heat Warnings · NWS PHL CLI (official climate report) · NWS Philadelphia · NWS active Extreme Heat Warnings Aug 3 · NWS active Extreme Heat Warnings Aug 4 · NWS active Extreme Heat Warnings Aug 5 · NWS active Extreme Heat Warnings Aug 7 · NWS active Extreme Heat Warnings Aug 8 · NWS active Extreme Heat Warnings ~07:50Z Aug 11, counted from the raw feature array · NWS active alerts (api.weather.gov), Extreme Heat Warning query, read pre-dawn Aug 23 2026 · NWS active alerts, Extreme Heat Warning query, Aug 13 2026 ~07:30 UTC, counted from the raw feature array · NWS active alerts, Extreme Heat Warning query, Aug 16 2026 ~07:00 UTC, counted from the raw feature array · NWS active alerts, Extreme Heat Warning query, Aug 18 2026 ~07:00 UTC · NWS active alerts, Extreme Heat Warning query, pre-dawn Aug 20 2026, counted from the raw feature array · NWS active alerts, Extreme Heat Warning query, pre-dawn Aug 21 2026, counted from the raw feature array · NWS active alerts, Extreme Heat Warning query, read pre-dawn Aug 22 2026 · NWS active alerts, Extreme Heat Warning query, read pre-dawn Aug 24 2026 · NWS active-alerts API read about 07:20 UTC Sep 22 2026 — total 391 active alerts (133 land, 258 marine); Flood Warning 41, up from 32 on Sep 21; Flood Watch 11; Flash Flood Watch 0; Heat Advisory 0; Excessive Heat Warning 0; Red Flag Warning 0; Special Weather Statement 8; Rip Current 6. The /count endpoint dropped its events breakdown and rejects ?event= with a 400, so the per-event numbers come from the /alerts/active?event= feeds. Event counts are live snapshots that can move within the hour; the day-over-day direction is the robust part. · NWS active-alerts API, Sep 17 2026 · NWS active-alerts API, Sep 18 2026 · NWS active-alerts API, counted by event type ~10:30 UTC Aug 28 2026 · NWS active-alerts API, counted event by event ~07:15 UTC Sep 8 2026 · NWS active-alerts API, per-event queries, Sep 16 2026 · NWS active-alerts API, read Sep 11 2026 · NWS active-alerts API, read about 0730Z Sep 19 2026 with targeted per-event queries: Heat Advisory 13, up from 10 the previous morning, across Arkansas, Illinois, Indiana, Kentucky, Missouri, Mississippi, Tennessee, Alabama and Kansas plus Puerto Rico and the US Virgin Islands, with a heat index to about 108 °F in Middle Tennessee and about 107 °F in Alabama; total active alerts 362, of which land 68 and marine 294 — the marine count again drove the total. The /count per-event object did not surface this run, so per-event figures come from ?event= feeds. Event counts are live snapshots that can shift within the hour; the day-over-day direction is the robust part. · NWS active-alerts API, read about 0740Z Sep 20 2026 with targeted per-event queries: Heat Advisory about 4, down from 13 the previous morning, across Kentucky, Indiana, Middle Tennessee, southern Illinois and south-east Missouri plus Puerto Rico and the US Virgin Islands, with a heat index to about 108 °F in Middle Tennessee and about 105 °F in Louisville; total active alerts 428, of which land 104 and marine 324 — the marine count again drove the total. The /count per-event object did not surface this run, so per-event figures come from ?event= feeds. Event counts are live snapshots that can shift within the hour; the day-over-day direction is the robust part. · NWS active-alerts API, read ~0715Z Sep 15 2026 · NWS active-alerts API, read ~07:05 UTC Sep 13 2026 · NWS active-alerts API, targeted /alerts/active?event= feature queries with the national total from /alerts/active/count, read about 07:20 UTC Sep 21 2026: total 336 active alerts (87 land, 249 marine); Flood Warning 32, Flood Watch 14, Flash Flood Watch 0; Heat Advisory 1 (from about 4), Excessive Heat Warning 0. Land alerts concentrated in Ohio, Illinois, Iowa and West Virginia, consistent with the Midwest and Ohio-Valley flood signal; marine dominated by Alaska. Event counts are live snapshots that can shift within the hour; the day-over-day direction is the robust part. · NWS active-alerts API, targeted feature queries with the national total from /alerts/active/count, read ~07:05 UTC Sep 12 2026 · NWS active-alerts alerts feed, counted by event type ~10:15 UTC Aug 27 2026 · NWS national active-alert tally Aug 4 · NWS national active-alert tally Aug 5 · NWS national active-alert tally Aug 7 · NWS national active-alert tally Aug 8 · Tomorrow.io · Tomorrow.io get_weather_forecast · WPC · WPC 12Z · WPC Day 3–7 · WPC Day 3–7 hazards · WPC Jul 24 · WPC PMDSPD 0651Z Aug 4 · WPC PMDSPD 1959Z Aug 6 · WPC PMDSPD 217 PM EDT Aug 7 · WPC PMDSPD 3:44 AM EDT Aug 5 · WPC PMDSPD 3:58 PM EDT Aug 10 · WPC PMDSPD Aug 3 · WPC Short Range · WPC Short Range 01Z · WPC Short Range 08Z · WPC discussion, Aug 24 2026 · api.weather.gov