Meridian B-VII · Barometer
1021.4hPa
Aneroid array, triple-capsule, reduced to sea level. Trend → over the last watch.
Kestrel Ridge Atmospheric Observatory · 46.417° N — 9.845° E · 3,212 m
One page, one whole day. Scroll, and the sky will pass over you —
first light to first stars.
EST. 1949
WMO 06781
CREW OF 4
READS THE SKY, DAILY
MORNING LOG · WATCH OFFICER E. RAVEL
05:58 — Ridge line visible. Valley fog holding at 2,100 m, top-lit rose. Pressure slept well overnight: 1019.2 hPa and steady. A day is about to be filed.
12:00 · Solar noon — transparency 94%
Glass that listens
to the air.
Six instruments keep the ledger. They were carried up the south couloir on mules in 1949 and have been replaced part by part since, like a ship that is always the same ship. Each one publishes here, live, drifting the way real air drifts.
Hygra-40 · Dew-point mirror
38% RH
Chilled-mirror hygrometer. The mirror fogs; a photodiode confesses it.
Anemos K2 · Ultrasonic
4.8m/s
No moving parts — it times sound across a gap. Bearing 214°.
Pyra-L · Pyranometer
918W/m²
Black thermopile under a glass dome, drinking the whole sky.
Ceilo-12 · Ceilometer
5200m base
A polite laser asks the cloud deck how low it intends to come.
PT-100 · Air temperature
11.8°C
Platinum wire in an aspirated shield, out of the sun's flattery.
At noon the sky pretends it has no secrets.
The instruments know better.
By mid-afternoon the horizon to the southwest has an opinion, and the light stops pretending not to hear it.
16:40 · Cell approaching from SW — 11.0 km
The pressure falls
like a held breath.
It began as a bright tower over the Bregaglia side, flat-topped by two o'clock — the anvil a signature we have read four hundred times and still stand up for. The Meridian dropped eleven millibars in ninety minutes. Everything metal on the terrace is now inside.
Strikes · session
214
Counted optically from the west gallery.
CAPE
1840J/kg
Fuel gauge of the convection. Full tank.
Gust · 1-min max
31.4m/s
The K2 sings above 25. It is singing.
CONVECTION LOG · 14 JULY
- First tower breaks the inversion. Cauliflower edges, hard light.
- Anvil overshoot observed. Ceilometer reports base collapsing — 2,400 m and descending.
- Hair lifts on the forearm near the terrace rail. We step back inside and log it, as regulation asks, under "field strength, anecdotal."
- First strike inside 10 km. Thunder arrives 27 seconds late, then apologizes for the delay all evening.
A storm is the sky balancing its accounts
all at once, and out loud.
The storm leaves the way trains leave — long after it has gone, and audibly.
19:52 · Precipitation 8.4 mm/h — sunset under rain
Every rain is filed
by the sound it made.
The cell passed; its long silver train did not. Rain at dusk falls through the last orange light and arrives already half asleep. The gauge ticks in the eave. Downstairs, someone puts the kettle on — the second-oldest instrument at this station.
FROM THE RAIN ARCHIVE · 1949 —
| Date | mm | Filed under |
|---|---|---|
| 14 Aug 1987 | 96.2 | The night the ravine changed course |
| 02 Jun 1994 | 41.7 | Applause on the tin roof, no encore |
| 29 Sep 2003 | 12.3 | Barely enough to settle an argument |
| 17 Jul 2018 | 63.9 | Six hours of someone typing upstairs |
| 05 May 2024 | 28.4 | Warm rain; the snowline lost a metre |
Rain rate
8.4mm/h
Tipping bucket, one polite click per 0.2 mm.
Humidity
93% RH
The air is carrying nearly all it can. So are we, some evenings.
The gauge does not know it is recording weather.
It believes it is keeping a diary.
Around ten the rain forgets itself. The sky, having settled its accounts, starts showing its savings.
23:31 · Sky quality 21.7 mag/arcsec²
The clearest instrument
is a dark sky.
Front through, air scrubbed, seeing extraordinary. The station goes quiet in a particular way after a storm day — the log describes it, every time, as "earned." M. Ferrant takes the night watch with the dome open and the heater off, because the telescope prefers honesty to comfort.
Seeing
0.8arcsec
Stars nearly motionless. A once-a-month stillness.
Airglow · 557.7 nm
faintgreen
The atmosphere's own light, visible only when everything else stands aside.
Temperature
-1.4°C
First frost of the season on the rail. Filed with satisfaction.
NIGHT WATCH · M. FERRANT
- Dome open. Andromeda naked-eye direct — not averted. Wrote it twice to be sure.
- Two late Perseids, one bright enough to throw a shadow across the log page. The log page is flattered.
- Valley below fully fogged; we are an island again. The barometer has climbed back to 1011.9 hPa — tomorrow will open clear.
The day closes its ledger.
Somewhere below, the valley believes the sky is empty.