Day Five: The Rain Arrived — and Carraízo Rose for the First Time

The tropical wave delivered. Five days into the metro rotation, this morning’s 5:00 chart from the Autoridad de Acueductos y Alcantarillados shows Carraízo at 37.53 meters — up 10 centimeters from yesterday. It’s the first rise since the rationing plan took effect, and the first since we began archiving the utility’s daily charts.

This is the second entry in our daily chart check (yesterday’s is here), built the same way — from AAA’s own numbers, read off its charts each morning for our reservoir board.

Carraízo: the first rise

Tuesday’s rain fell on the right mountains, and the live rain strip on our water page tracked it as it fell.

The arithmetic of relief, against AAA’s control line — the band where the published Phase 2, one day of water and three without, stops being hypothetical:

What the rivers say

The reservoir is still collecting Tuesday’s rain.

As long as the Loíza runs high, some of yesterday’s rain is still arriving — today’s uptick may not be the whole of it. And the last row above explains this morning’s chart: La Plata’s basin caught less, so it didn’t rise. It fell 4 centimeters instead of its recent 9.

One wet day is not a trend

Keeping ourselves honest, three things this rise does not mean:

• The rotation isn’t ending. AAA has announced no change; Zone 2’s switch runs on the published calendar regardless.
• La Plata isn’t saved. The reservoir serving 130,000 customers in Bayamón, Toa Alta and the rest of the northwest metro is still falling, just more slowly — and AAA’s stated bar there is holding the drop under 10 cm a day, not reversing it.
• The drought isn’t over. It took months to build. Cidra, the third reservoir in the rotation’s plumbing, gained 5 centimeters and is still deep in its ajustes band.

If your water comes from La Plata: Guaynabo, Bayamón and the northwest metro

La Plata serves 130,828 customers across Guaynabo, Bayamón, Toa Alta, Toa Baja, Cataño, Dorado, Vega Alta, Naranjito and Corozal — no rotation there, but it has been the fastest-falling reservoir on the board, and Tuesday’s rain mostly missed its mountains. Where it stands this morning:

The honest read for La Plata customers: this rain was a pause, not a rescue. AAA ruled out immediate rationing there on Monday and says its pressure adjustments aim to hold the daily drop under 10 centimeters — a bar it’s meeting. But the basin caught the least of Tuesday’s rain, its feeder river barely stirred, and the forecast behind tonight turns dry. If the ~9 cm/day pace returns, La Plata crosses into ajustes around the end of August. The number to check each morning on the reservoir board is that daily drop: under 5 is genuinely good news, back near 9 means the clock is running again.

The forecast: one more wet night, then the haze

There is one more act: scattered showers today with chances peaking near 60% tonight as the wave’s moisture exits. Then the pattern flips exactly as advertised yesterday — Saharan haze spreads in Thursday, and Friday through Saturday the forecast reads 10 to 20 percent, essentially dry days with strong trade winds. Whatever tonight adds is the last easy water for a while.

What to watch

Tomorrow’s chart. If the Loíza keeps draining in overnight, Carraízo could add more before the dry stretch bites — tomorrow’s 5:00 reading tells us whether the +10 was the start of something or all of it. Thursday’s Drought Monitor. The first weekly map to reflect this rain lands tomorrow; our town-by-town map updates with it, and it will show whether one wave dented D3 on the south coast, where the drought is worst and no reservoir catches the runoff. The control line. The gap is 53 centimeters; the reservoir board tracks it daily, and the running story lives on the water crisis timeline.