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What the Rain Gauges Measured
How much rain has actually fallen in the last hour at ARPAL's nearest instruments — Monterosso, the ridge above Riomaggiore, and over the watershed inland. Measurements, not a forecast, and never a flood warning.
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Vernazza's other rain page reads a weather model; this one reads gauges. When the two disagree, the gauge is the one that measured something.
There is no rain gauge in Vernazza, and none in the small steep catchment the Vernazzola drains. The nearest are in the next commune along the coast, on the ridge at the far end of the Cinque Terre, and over the watershed inland — so read these as rain near Vernazza, not rain on Vernazza.
Measured at the gauges, not forecast
No rain measured at any reporting gauge in the last hour.
8 gauges are reporting and every one of them measured 0.0 mm over the last hour. That is a measurement of the hour just gone at these gauges, not a statement about the hours ahead.
Readings last collected .
This page is not a warning
Rain measured at a gauge is a measurement, not an alert. The decision that Liguria is in danger is made by the Regione's civil protection system and published as the allerta — yellow, orange or red — and that is what schools, the comune and the trails act on. If you are in immediate danger, call 112.
The warning comes from here, not from this page
The allerta today — What colour is in force for Vernazza's zone right now
The two closest gauges to the village. Monterosso is the next commune up the coast; Corniolo is in the Riomaggiore commune, at the other end of the five villages.
Gauge
Rain in the last hour
Reading taken
Monterosso
0.0 mm
Corniolo
0.0 mm
Over the ridge, inland
The far side of the watershed, in the Vara valley. Rain here does not run down to Vernazza — these gauges say what the same weather system is doing a few kilometres behind the ridge, which is often the first sign of what is coming over it.
Gauge
Rain in the last hour
Reading taken
Casale di Pignone
0.0 mm
Mattarana
0.0 mm
Padivarma
0.0 mm
West along the coast
Past Monterosso, towards Levanto and Framura. Storms on this coast usually arrive from the west, so these gauges tend to measure it first.
Gauge
Rain in the last hour
Reading taken
Levanto
0.0 mm
About these gauges
These gauges belong to OMIRL, the monitoring network ARPAL runs for the Regione Liguria — the same instruments the allerta is built on. ARPAL publishes the whole regional network as one snapshot roughly every minute, and each figure is the rain that fell at that instrument over the hour just gone.
What a gauge cannot do is stand in for a hillside. A rain gauge measures the rain falling on one spot, about the size of a dinner plate. The Vernazzola gathers rain off the whole slope above the village, including ground where no instrument stands, and none of these gauges is in that catchment. A gauge reading zero is a real measurement of that spot and says nothing about the ravine.
ARPAL publishes the whole regional network as one snapshot with a single reading time, so every gauge here shares it. A gauge that stops transmitting leaves the table rather than sitting in it with an old number — which is why a gauge listed below can show as not in the feed. Each figure is the rain that fell at that instrument over the hour just gone.
Why anyone here watches the rain
On 25 October 2011 some 542 mm of rain fell in about six hours on this stretch of coast. The Vernazzola, which runs buried under Via Roma, brought the slope down with it: three people died in Vernazza and the main street was left under three to five metres of mud and debris.
The stream is still culverted and the slopes above are still steep. That is why the number on this page that matters is not today's total but the rate — how much fell in one hour, and whether it is still falling.
What to do with a big number here
Nothing on this page tells you to act. If a gauge near Vernazza is measuring heavy rain, the things worth doing are the ordinary ones: check the allerta, stay out of the ravine and off the trails, and keep away from the stream's line under Via Roma. The comune and the Protezione Civile decide the rest.
Every number on this page is a measurement from an instrument at one spot, for one hour that has already happened. It is not a forecast, it is not a flood warning, and it cannot tell you whether a street, a home or a torrent is safe. Rain at a gauge and water in a culverted stream are not the same thing: the stream gathers rain from the whole slope above it, including ground no gauge stands on.
Dati: Arpal — OMIRL, rete di monitoraggio della Regione Liguria (http://www.arpal.liguria.it), CC BY-NC-SA 2.5 IT