What the Weather Did

Sort the ledger by lives lost and the famous storms fall down the page. Heat, which rarely makes a photograph, leads. The tornado - the hazard with its own film genre - is a close second. Winter weather and cold is third, flood water fourth, and hail, the loudest thing that ever hits a roof, kills almost no one. The bar is deaths; the line beneath it is how often the event shows up and what it billed.

1. 01 Heat 6,704 deaths
   56,126 events · $540M damage
2. 02 Tornado 6,408 deaths
   80,626 events · $78B damage
3. 03 Winter Weather & Cold 3,573 deaths
   340,638 events · $21B damage
4. 04 Flood & Flash Flood 3,034 deaths
   185,773 events · $176B damage
5. 05 Thunderstorm & High Wind 2,393 deaths
   739,659 events · $34B damage
6. 06 Hurricane & Tropical 1,762 deaths
   12,246 events · $250B damage
7. 07 Rip Current 1,410 deaths
   1,896 events · $0M damage
8. 08 Other 1,214 deaths
   147,711 events · $34B damage
9. 09 Lightning 1,009 deaths
   18,179 events · $1.1B damage
10. 10 Wildfire 576 deaths
    9,454 events · $41B damage
11. 11 Marine & Coastal 371 deaths
    17,033 events · $492M damage
12. 12 Hail 29 deaths
    420,877 events · $37B damage

● Full Full NCEI ingest. Ranked by real deaths, direct plus indirect. See Methodology.

"Worst" is a choice of yardstick. This board keeps three of them: lives, frequency, dollars. Pick one and the leaderboard reshuffles; no family tops more than one column. That is the whole reason a single headline hazard misleads - the answer changes with the question.

● Full Full NCEI ingest. Teal carries lives, bronze carries dollars, slate carries the count - the colors never trade jobs on this page.

Put every family on one field - lives up the side, dollars along the bottom - and the ledger's two stories come apart. Heat holds the top-left corner: the deadliest hazard barely dents the property column. Hail holds the bottom-right: $37B of dented roofs and almost nobody hurt. Only flood water is fluent in both currencies.

Divide each family's toll by how often it appears in the log and the frequency board flips upside down. A hurricane entry is roughly two thousand times as lethal as a hail entry. The everyday hazards - thunderstorm wind, hail - are nearly harmless one event at a time; they earn their place in the toll by sheer volume.

The annual line never sits still. Its spikes are single afternoons: a tornado through Waco, a heat dome parked on Chicago, a levee failing in New Orleans. Between the spikes the floor itself drifts upward - more people in harm's way, and a database that learned to count more of them.

Averaged by decade, the noise of single disasters smooths into a slope. The 2010s were roughly 5.5 times as deadly as the 1950s - more than fivefold. That slope is three things braided together - a hotter climate, far more people and property in the storm belt, and a ledger that counts more carefully than it used to. The next section unbraids them by family; the last one unbraids the ledger itself.

Split the toll by family and the twentieth century trades places with the twenty-first. Tornado and lightning deaths fall decade over decade - radar, sirens and forecasting at work. Heat, rip currents and wildfire climb. Read the early decades gently: before the mid-1990s the log barely counted anything that wasn't a tornado, hail or wind.

Severe weather keeps office hours. Tornado deaths climb through the spring; then heat takes the ledger over, and July is the deadliest month of the year by a wide margin. September belongs to hurricanes, the year's shoulders to cold. The hazard that leads each month's toll is printed under the chart.

Darker is deadlier. Arizona tops the raw count, followed by Texas, Florida and California - the last three big, populous, and exposed to nearly every family on the board. But a raw count tracks population as much as danger. Divide by residents and Arizona holds its lead while the rest of the order moves inland, to the Plains and the Deep South, where the same storms fall on far fewer people.

The dozen heaviest state ledgers. Arizona tops it despite logging far fewer events than the states behind it. Texas is close behind and leads on almost every family at once - it is big, exposed to all of them, and the most populous state in the storm belt. Note how weakly the second column tracks the first: a single hard freeze or heat wave in a dense metro outweighs years of routine storm reports.

1. Arizona 3,093
   17,822 events
2. Texas 2,495
   163,561 events
3. Florida 1,431
   40,712 events
4. California 1,357
   41,431 events
5. Louisiana 1,340
   32,626 events
6. Illinois 1,172
   65,503 events
7. Alabama 1,005
   43,857 events
8. Missouri 1,004
   72,408 events
9. Nevada 990
   8,685 events
10. Mississippi 926
    41,571 events
11. Pennsylvania 900
    53,846 events
12. Tennessee 804
    45,863 events

● Full Full NCEI ingest. See Methodology.

Before trusting any trend on this page, look at the instrument that recorded it. The database logged only tornadoes until 1955, added hail and wind reports, then held under twenty thousand entries a year until the 1996 rebuild started counting all 48 event types at once. Every long-run rise above is part weather, part population, and part this line.