Emerging Science — Issue 55

Main Feature

When Is a Drought Over? Herding Families in Northern Kenya Recovered on Different Clocks

By Maya Jiménez— October 22, 2026

Feature image for article: When Is a Drought Over? Herding Families in Northern Kenya Recovered on Different Clocks

In March 2023 the rains returned to Illeret, on Kenya's Lake Turkana, after five failed seasons, and aid agencies declared the drought over. That summer, 71 percent of Daasanach herders surveyed landed in the most serious category of water insecurity, up from 41 percent a year earlier, deep in the drought. The same rains brought floods that cut off food aid for months.

A Penn State team had measured these households in 2019, before anyone saw the drought coming, and kept measuring to see what came back, and when.

Main Feature

When Is a Drought Over? Herding Families in Northern Kenya Recovered on Different Clocks

By Maya Jiménez— October 22, 2026

In March 2023 the rains returned to Illeret, on Kenya's Lake Turkana, after five failed seasons, and aid agencies declared the drought over. That summer, 71 percent of Daasanach herders surveyed landed in the most serious category of water insecurity, up from 41 percent a year earlier, deep in the drought. The same rains brought floods that cut off food aid for months.

A Penn State team had measured these households in 2019, before anyone saw the drought coming, and kept measuring to see what came back, and when.

Ecosystem Quick Scan

Keep a list long enough and it starts arguing with your memory. It might be butterflies in the yard, the day the first warbler shows up, the river's height on the gauge, or what grows on the reef you've dived for twenty years.

Each card below pairs a recent finding with what someone watching one place year after year might see, then with what the study can't tell them yet. The gap usually sits between a species arriving and a species surviving, or between a coral bleaching and a coral dying.

Several of these findings are modeled, experimental, or still in peer review. The cards say which.

Ecosystem Quick Scan

Keep a list long enough and it starts arguing with your memory. It might be butterflies in the yard, the day the first warbler shows up, the river's height on the gauge, or what grows on the reef you've dived for twenty years.

Each card below pairs a recent finding with what someone watching one place year after year might see, then with what the study can't tell them yet. The gap usually sits between a species arriving and a species surviving, or between a coral bleaching and a coral dying.

Several of these findings are modeled, experimental, or still in peer review. The cards say which.

Land & Sky

The yard butterfly list keeps rewriting itself

Pooled range records for 1,758 butterfly species show expansion in 80%, contraction in 27%, and moves up or downslope in 22%. One species can do several at once. Most shifts tracked climate and extreme weather. A new name in your yard means one arrived, not that it breeds there.

Land & Sky

Siberian birds barely moved their spring arrival dates

Central Siberia warmed 0.60°C per decade, yet spring bird arrivals moved earlier by less than a day per decade. The author's explanation is that inland spring comes late and heats fast, leaving little early window to use. A steady first-arrival log can coexist with real change. It also says nothing about nesting success.

Ice & Rivers

Glacier models were averaging away the worst days

Run a global glacier model day by day instead of month by month, and it projects extra loss worth 20 to 33 mm of sea-level rise by 2100, roughly an inch. Monthly averages had smoothed over the hot spells and rain-on-snow days people below glaciers remember. It doesn't forecast local water supply.

Ice & Rivers

Global rivers ran near 35-year lows in 2025

The World Meteorological Organization ranks 2025 among the driest years for global river flow in 35 years of records, after a decade of shrinking water stored on land. A global ranking can't vouch for your particular river. Local stream gauges and well records can, and in the US the USGS posts gauge data online.

Coastal Ocean

NOAA's first look at West Coast bottom water

An experimental NOAA forecast calls for unusually warm seafloor water along the West Coast and in the Gulf of Alaska through spring 2027. Satellites read only the surface, so they'll miss it. Crews hauling crab pots might notice. The methods are still in peer review, and the forecast predicts no fishery closures.

Coastal Ocean

Kelp understory vanishes in warm years, then returns

In the Santa Barbara Channel, understory kelps, the shorter species growing beneath the giant kelp canopy, crashed during marine heatwaves and recovered quickly. Subtropical and introduced species kept spreading for a decade regardless. A diver sees the forest come back. The authors warn more frequent heatwaves could make the newcomers permanent.

Coral Reefs

Japan's northern refuge corals bleached in 2024

Tropical corals absent from 1930s surveys now dominate the reef at Tatsukushi, in temperate Japan. In 2024, nearly every colony observed there was pale, bleached, or dead. The usual measure of accumulated heat failed to predict which sites suffered. At Kushimoto, where corals mostly recovered, a typhoon may have cooled the water.

Coral Reefs

Dead coral skeletons can shelter the seaweed takeover

Heatwaves kill coral but leave the skeletons standing. Field experiments suggest those skeletons shield seaweed from the animals that graze it, and plots that flipped to seaweed stayed that way after the skeletons crumbled. Cyclones, which scour reefs clean, had the opposite effect. This is an unreviewed preprint from one reef system.

Research Summaries

The body: three days of heat inside a mock Ottawa apartment (Meade et al., The Lancet Planetary Health)

Eighteen older adults spent three days in a climate chamber set up like a studio apartment, with days at 34°C (93°F) and nights at 26°C (79°F). Compared with three days at a steady 26°C, their heart rates rose, blood pressure fell, kidney-stress markers climbed, and balance and attention slipped slightly.

Did strain build night after night?

Not over these three days, despite our earlier emphasis. Core temperature leveled off, and the morning blood-pressure and kidney effects lingered without worsening.

Is a 26°C night cool enough?

It is Health Canada's indoor ceiling for older adults, and it didn't fully reset these bodies. Eighteen volunteers healthy enough to qualify can't settle that.

The day: the temperatures Phoenix residents actually lived in (Guzman-Echavarria et al., GeoHealth)

Sensors in homes and on bodies tracked a small group of Phoenix-area adults, ages 45 to 74, for three weeks in summer 2024. Their surroundings averaged 10.4°C (about 19°F) cooler than regional weather readings, and people with less money got less of that cushion.

Who stays hottest?

Participants earning under $40,000 hit daily peaks about 3.7°C (6.7°F) higher than those earning over $80,000. With so few people, that gap is a rough estimate.

What can't the sensors show?

Whether anyone got sick, or whether hours in a cool room meant safety or being stuck inside. Everyone had some cooling, and body heat load was modeled.

Research Summaries

The body: three days of heat inside a mock Ottawa apartment (Meade et al., The Lancet Planetary Health)

Eighteen older adults spent three days in a climate chamber set up like a studio apartment, with days at 34°C (93°F) and nights at 26°C (79°F). Compared with three days at a steady 26°C, their heart rates rose, blood pressure fell, kidney-stress markers climbed, and balance and attention slipped slightly.

Did strain build night after night?

Not over these three days, despite our earlier emphasis. Core temperature leveled off, and the morning blood-pressure and kidney effects lingered without worsening.

Is a 26°C night cool enough?

It is Health Canada's indoor ceiling for older adults, and it didn't fully reset these bodies. Eighteen volunteers healthy enough to qualify can't settle that.

Research Summaries

The day: the temperatures Phoenix residents actually lived in (Guzman-Echavarria et al., GeoHealth)

Sensors in homes and on bodies tracked a small group of Phoenix-area adults, ages 45 to 74, for three weeks in summer 2024. Their surroundings averaged 10.4°C (about 19°F) cooler than regional weather readings, and people with less money got less of that cushion.

Who stays hottest?

Participants earning under $40,000 hit daily peaks about 3.7°C (6.7°F) higher than those earning over $80,000. With so few people, that gap is a rough estimate.

What can't the sensors show?

Whether anyone got sick, or whether hours in a cool room meant safety or being stuck inside. Everyone had some cooling, and body heat load was modeled.

Short Science Explainer

A Strong El Niño Is Likely. It Can't Tell You Where or When Floods Will Hit.

NOAA, the U.S. weather agency, gives better than an 83% chance that a strong or very strong El Niño, a Pacific warming that shifts weather worldwide, lasts into early spring. Its winter outlook leans wet from California to Florida.

Those odds describe a season. They can't tell you which week, which river basin or which storm, and past El Niños have been uneven. The Weather Service office in Sacramento calls the Northern California record mixed.

Most flood damage in the West comes from atmospheric rivers, long bands of water vapor that scientists rate from 1 to 5 by how much water they carry and for how long. The scale's authors say the number describes the storm and says nothing about the ground it lands on. A wildfire burn scar or already-soaked soil can turn a useful storm into a dangerous one.

A February study in Nature Communications added how wet the soil was before each storm, and the ratings matched how high rivers actually rose nearly twice as well. The same storm that refills reservoirs in November can flood streets in February, once two months of rain have filled the soil.

Short Science Explainer

A Strong El Niño Is Likely. It Can't Tell You Where or When Floods Will Hit.

NOAA, the U.S. weather agency, gives better than an 83% chance that a strong or very strong El Niño, a Pacific warming that shifts weather worldwide, lasts into early spring. Its winter outlook leans wet from California to Florida.

Those odds describe a season. They can't tell you which week, which river basin or which storm, and past El Niños have been uneven. The Weather Service office in Sacramento calls the Northern California record mixed.

Most flood damage in the West comes from atmospheric rivers, long bands of water vapor that scientists rate from 1 to 5 by how much water they carry and for how long. The scale's authors say the number describes the storm and says nothing about the ground it lands on. A wildfire burn scar or already-soaked soil can turn a useful storm into a dangerous one.

A February study in Nature Communications added how wet the soil was before each storm, and the ratings matched how high rivers actually rose nearly twice as well. The same storm that refills reservoirs in November can flood streets in February, once two months of rain have filled the soil.

TAKE NOTE

Today (Oct. 22): Most flood insurance comes through the federal National Flood Insurance Program (NFIP), and a new policy usually kicks in 30 days after purchase. Buy today and you're covered around Nov. 21. A flood already underway when you buy isn't covered.

No wait if: a federally backed lender requires the policy, or it's tied to a flood-map change.

Renters: Regular renter's insurance usually excludes floods. NFIP covers belongings only, up to $100,000, and won't pay for somewhere to stay if you have to leave.

Nov. 12: NOAA's next El Niño update. The odds can move.

Dec. 11: NFIP's legal authority expires unless Congress renews it. During the 43-day lapse that began Oct. 1, 2025, nobody could buy or renew; existing policies held. Private flood insurers don't need Congress and set their own start dates.

California: The state's Sept. 21 emergency order gets equipment in place and speeds permits. It sends households no money and doesn't waive the 30-day wait.

About 7 days out: First forecasts for a specific atmospheric river. Older studies found five-day forecasts could miss landfall by about 500 km (300 miles).