Our Weather Balloon Found Footprints Above the Clouds

It was routine enough that we numbered launches instead of naming them.

Balloon 4481 stopped climbing at 31,204 meters.

It did not burst. Its pressure sensor showed the balloon resting against something solid, though there was nothing above it except thinner air and space. The upward-facing camera recorded a flat surface bending beneath the latex like clear ice.

Dust lay on the invisible surface.

A barefoot human track appeared in it.

Then another.

The prints approached from beyond the camera's view, each forming heel first and rolling to the toes. Whatever made them walked upside down relative to us, as naturally as someone crossing a dusty floor.

My supervisor, Dr. Sato, assumed the camera housing had rotated. Telemetry disagreed. The sun, horizon, and stars all proved which direction was up. The footprints existed above the balloon on a surface no atmospheric model contained.

They stopped directly over the camera.

A face looked down.

It was human in outline but blurred by bands of moving cloud. Lightning flickered where its eyes should have been. Its mouth was a thin pressure contour marked 1013.

The figure tapped the invisible surface with one toe.

Every barometer at Red Mesa jumped by ten millibars.

The video feed ended.

Balloon 4481 landed forty miles east three hours later. Its parachute never deployed, yet the instrument box was undamaged. White dust coated its top surface. We analyzed it as salt, pollen, volcanic ash, soot, and pulverized insects collected from weather systems spanning several continents.

A second tether was tied to the package.

It was not synthetic cord. It was a narrow braid of hair, spider silk, contrails, and something that looked like frozen breath. The strand rose vertically from the box and vanished into blue sky.

We cut it with ceramic shears.

The loose end did not fall. It snapped upward so quickly it carved a straight white line through the air.

That night, frost footprints appeared on the station roof. They crossed from west to east along the underside of the metal awning, soles pressed upward, as if someone had walked across an invisible ceiling six inches above us.

The next morning's clouds were wrong.

They had shadows on their upper surfaces instead of below. Rain rose from shallow puddles in silver threads. Hawks circled upside down for several seconds before righting themselves and fleeing south.

Sato canceled the noon launch. At noon exactly, the automatic inflation shed started by itself.

Balloon 4482 filled with helium. The doors opened. Our launch arm released it while all five of us stood behind the emergency fence.

Its payload transmitted one line before we could disable the receiver.

GROUND REFERENCE ACCEPTED.

The balloon climbed faster than any we had launched. It reached 31,204 meters in eleven minutes and stopped at the same invisible surface.

The live camera found the figure waiting.

This time we saw more of the place above the sky. The clear surface extended like glass beneath a pale landscape. Tornadoes grew from it like black tree roots, branching upward into a white distance. Storm fronts crawled across the ground on hundreds of legs. Rows of human shapes stood at the horizon, each holding a balloon by its string.

The nearest figure crouched and placed one cloudy hand around our balloon.

Its pressure-contour mouth opened.

Below, it said.

The word arrived through every weather radio in our station, spoken in the voices of storm warnings recorded over fifty years.

The figure began climbing down the tether.

It did not descend through empty air. With each handhold, the invisible surface above it bowed lower. The sky itself sagged. Our ceilometer measured a solid reflective layer dropping at nearly a kilometer per second.

At 3,000 meters, the layer passed through a cloud deck and pressed the clouds flat against it. At 1,000 meters, birds struck it and remained pinned overhead, beating their wings against clear nothing.

At 300 meters, all sunlight turned the color of bruises.

We could see the figure without cameras now. It walked upside down across the lowered sky, following the tether toward our compound. Its body was made from weather: dust rotating in its chest, rain falling upward through its limbs, blue lightning branching beneath translucent skin.

Where its face should have been, our own weather map updated in real time.

A red warning polygon formed around Red Mesa.

EVENT: SURFACE CONTACT.

IMPACT: TOTAL.

The air smelled of ozone and wet pavement, though the desert was dry.

Sato realized what our radiosonde had done. Every instrument calculates altitude from a reference pressure at the ground. When 4481 stopped climbing, its software automatically recalibrated. It had declared the invisible upper surface to be ground.

The thing above had accepted the definition.

Balloon 4482 continued broadcasting the false reference, turning the whole atmosphere between us into below ground. The figure was not descending. According to our instruments, it was walking deeper into the earth.

We tried to terminate the flight. The command came back as BAROMETER BELOW SERVICE LEVEL.

The clear ceiling reached fifty meters. Utility poles bent beneath it. A freight truck on the highway struck nothing and flattened as if an enormous pane had dropped across the road.

The figure stepped over the station fence without changing its upside-down orientation. Its foot pressed a six-toed frost print into the air above my head.

I felt the pressure inside my ears reverse.

Images that were not memories filled my mind: storms being assembled beyond the stratosphere, clouds stitched to cold fronts, lightning coiled and stored in transparent jars. The figures at the horizon were not forecasting weather. They were lowering it to worlds beneath them.

And our balloons had shown one where to stand.

Technician Rima found the old mercury barometer we kept as a museum piece. Unlike digital instruments, it had no software reference. Its glass column had fallen below zero and continued down through the table, a silver line pointing into the floor.

We carried it to the transmitter and wired its analog reading into the radiosonde uplink.

Then we inverted the signal.

Instead of telling 4482 that the upper surface was ground, we transmitted a reference altitude with no possible pressure: higher than orbit, lower than vacuum, a place the atmosphere could not define.

The balloon replied GROUND REFERENCE LOST.

The figure stopped.

Its map-face flickered between continents that did not exist. The warning polygon collapsed. Wind tore through its body from every direction at once.

The clear ceiling sprang upward.

Birds, clouds, dust, and the figure fell toward the sky. The tether ripped free of our launch arm, slicing the metal post in half. For one instant the creature was stretched between two definitions of ground, its hands reaching down while its legs vanished into blue.

It left one footprint suspended above the station.

Then the sky returned to its proper height.

Balloon 4482 disappeared. Aviation radar tracked it past 100 kilometers before the signal stopped. The official report describes a software failure and unusual optical phenomena. The crushed truck was blamed on driver error, though photographs show a perfectly flat roof and six-toed frost prints in midair above it.

Red Mesa no longer launches balloons.

I moved to a city near sea level, where the sky is usually hidden by buildings. For months, my barometer behaved normally.

This morning it read 31,204 meters inside my apartment.

White dust covers the tops of my ceiling fans. Bare footprints are appearing in it one at a time. Each print dents the ceiling downward a little farther.

A weather alert on my phone says GROUND REFERENCE ACCEPTED.

The ceiling is now low enough to touch, and when I press my palm against it, something walking on the other side presses back with a hand full of lightning.