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Shaded-relief map of La Alianza, Puerto Rico: rivers, roads, the city limits and where the water drains.
PUERTO RICO · ARECIBO MUNICIPIO

La Alianza

2,265 people, 620 ft above sea level in Arecibo Municipio.

620 ftElevation, city center
2,265People, 2024 estimate
1 sq miLand area
Sunny 88°
Sunny now Dew point -26° · SSE 13 mph · high 87°
City of La Alianza River Interstate 2 miles
Explore the plate Order a print

The La Alianza plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in La Alianza

NWS forecast and National Blend of Models · updated 2:00 PM AST
RIGHT NOW Mercedita Airport (TJPS) · 3:55 PM
Sunny
88° Sunny Feels like 85° · high of 87° near 4 PM
WindSSE 13 mphno gusts
Humidity1%rising to 88% by morning
Pressure29.93 in →steady
Visibility7 mihazy
CloudsClear
UV index—no forecast
Dew point -26° · Dry77° by Saturday: more humid
DryComfortableStickyMuggyOppressive
NEXT RAIN
Rain
Tomorrow, about 4 AMin about 12 hours · 31% chance · rain
LIKELY AMOUNT—amounts come within 3 days
LAST RAINNov. 130.4 in · 1 dry day
ALERTS & OUTLOOKS
! Heat AdvisoryHeat Advisory issued November 14 at 9:51AM AST until November 14 at 5:00PM AST by NWS San Juan PR
NWS San Juan and the Storm Prediction Center · checked 4:17 PM
SUN & MOON
↑ 6:32 AM5:49 PM ↓
11 h 17 m of daylight, 1 minute less than yesterday
Waxing crescent, 25% lit. Next full moon: Nov. 24.
AIR & POLLEN
64
MODERATEAir quality index · fine particles
No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
SATURDAY, NOV. 14
SUNDAY, NOV. 15
MONDAY, NOV. 16
TUESDAY, NOV. 17
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
1p
4p
7p
10p
1a
4a
7a
10a
1p
partly cloudy day
partly cloudy night
mostly cloudy night
mostly cloudy night
rain
mostly cloudy day
mostly cloudy day
mostly cloudy day
partly cloudy day
partly cloudy night
partly cloudy night
partly cloudy night
mostly cloudy night
partly cloudy day
partly cloudy day
partly cloudy day
showers day
showers night
partly cloudy night
partly cloudy night
partly cloudy night
partly cloudy day
partly cloudy day
partly cloudy day
TEMPERATURE °F
87°
78°
89°
75°
90°
75°
CHANCE OF RAIN
57% · 0.24 in Monday afternoon 50%
WIND, MPH
10
9
9
9
8
8
10
10
8
6
6
7
6
6
8
10
8
7
7
7
7
7
8
12
HOW IT FEELS · DEW POINT
Oppressive: dew points 70 to 77°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 80° / 62°
SAT Nov. 14 Partly cloudy Partly cloudy
87° 77°
20% rain — SE 11 A
SUN Nov. 15 Chance of showers Chance of showers
89° 75°
30% rain — ESE 9 A
MON Nov. 16 Chance of showers; hot Chance of showers; hot
91° 75°
60% rain up to 0.09″ ESE 8 A
TUE Nov. 17 Chance of showers; hot Chance of showers; hot
91° 76°
50% rain — ENE 8 A
WED Nov. 18 Chance of storms; hot Chance of storms; hot
90° 76°
60% rain up to 0.06″ E 8 A
THU Nov. 19 Chance of storms Chance of storms
89° 76°
50% rain — E 8 A
FRI Nov. 20 Chance of showers Chance of showers
89° 76°
30% rain — E 7 A
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over La Alianza about 5,000 feet above the ground was over the tropical Atlantic three days ago, and over the Caribbean a day ago, about 810 miles back along its path. Air off the water carries moisture, which is why it feels humid. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

THIS WEEK IN 2004 Nov. 14–15, 2004

The wettest two days this week has seen

4.31 inches of rain fell in two days, the most for this week of the year since records began in 1937. The next wettest, 3.82 inches, fell in 1985.

3.82″
4.31″
19852004
Source: NOAA RCC-ACIS, the Dos Bocas record since 1937.
MILE2
THE GROUND

What La Alianza stands on

La Alianza’s center stands about 620 ft above sea level. Within three miles the land runs from 300 ft to 890 ft, a difference of 590 ft: hilly country. The highest named summit within 15 miles is Piedra Blanca, about 4,050 ft, 15 miles south.

La Alianza, cut in half from south to north

A section south to north, 24 miles through the town center
0 ft1,000 ft2,000 ft LA ALIANZA620 ftJayuya1,480 ftSabana Hoyos380 ft ← S · JayuyaN →

Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×.

Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR.

MILE5
THE ALMANAC

La Alianza’s year

1991–2020 normals · records since 1937 · Dos Bocas, 6 mi southwest

La Alianza has a tropical rainforest climate. Summer afternoons average 91° in June; winter nights fall to about 64° in January. About 78 inches of rain fall in a normal year.

85°64°86°64°86°64°88°67°89°69°91°70°91°71°91°71°91°70°90°70°87°69°86°66° JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 12 TODAY LA ALIANZA 78.2 in rain a year
Normal high to low, by month Record high to low, by day Rain by month
June, average91° / 70°high / low, the warmest month
January, average85° / 64°high / low, the coldest month
Rain a year78.2 inwettest months: May and September
Hottest on record100°FSeptember 8, 1954
Coldest on record50°FDecember 23, 1991
Wettest day on record9.63 inDecember 10, 1965
90° days a year98none reach 100°
Climate typeTropical rainforestKöppen Af

AROUND THE RING

1Highs of 90° and upMay 28 to Oct. 23; normal highs reach 90°
2Wettest stretchAugust through October: 26.3 of the year’s 78.2 inches
NOVEMBER 14 IN THE RECORD

On November 14 La Alianza normally reaches 87° and falls to 69°. The record high is 95°, in 1939; the record low 62°, in 1948. The most rain on this date, 3.44 in, fell in 1977.

MONTH BY MONTH
JanFebMarAprMayJunJulAugSepOctNovDec
Normal high85°86°86°88°89°91°91°91°91°90°87°86°
Normal low64°64°64°67°69°70°71°71°70°70°69°66°
Rain, inches3.613.464.826.8210.235.815.368.129.698.457.344.54
Record high96° (1988)94° (1964)96° (1997)98° (1966)98° (1977)99° (1982)99° (2025)100° (1954)100° (1954)98° (1947)97° (1983)96° (1948)
Record low50° (1985)51° (1994)51° (1937)52° (1992)52° (1984)59° (1992)58° (1980)60° (1993)58° (1947)58° (1984)58° (1981)50° (1991)

Normals 1991–2020 and records since 1937 at Dos Bocas, 6 miles southwest, 420 ft lower. NOAA, through RCC-ACIS.

MILE7
ON THE NETWORK

Around La Alianza on the Forecast Network

Neighboring plates

Bayamón PR · 29 MI 29 miles east San Juan PR · 35 MI 35 miles east Carolina PR · 41 MI 41 miles east
FORECASTCITY
Map of La Alianza, Puerto Rico. Explore the plate
PUERTO RICO · ARECIBO

La Alianza

2,265 people, 620 ft above sea level in Arecibo Municipio.

620 ftElevation
2,265People
1 sq miLand
Sunny 88°
SunnyDew point -26°
1

Today in La Alianza

NEXT 15 HOURS
Now partly cloudy day 87° 10%
7p partly cloudy night 82° 9%
10p partly cloudy night 81° 0%
1a mostly cloudy night 79° 0%
4a rain 78° 31%
7a mostly cloudy day 79° 0%
Rain
NEXT RAINTomorrow about 4 AM · 31%
→
Sat20%
Partly cloudy Partly cloudy
77
87
A
Sun30%
Chance of showers Chance of showers
75
89
A
Mon60%
Chance of showers; hot Chance of showers; hot
75
91
A
Tue50%
Chance of showers; hot Chance of showers; hot
76
91
A
Wed60%
Chance of storms; hot Chance of storms; hot
76
90
A
Thu50%
Chance of storms Chance of storms
76
89
A
Fri30%
Chance of showers Chance of showers
76
89
A
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
THIS WEEK IN 2004 · NOV. 14–15, 2004

4.31 inches in two days, the most for this week since 1937.

2

What La Alianza stands on

La Alianza’s center stands about 620 ft above sea level. Within three miles the land runs from 300 ft to 890 ft, a difference of 590 ft: hilly country. The highest named summit within 15 miles is Piedra Blanca, about 4,050 ft, 15 miles south.

La Alianza, south to north La Alianza620 ft ← SN → 24 miles through the town center; vertical exaggeration about 12×.
Elevation, center620 ft
Within 3 miles300 to 890 ft
Lie of the landHilly (590 ft of relief)
High point nearbyPiedra Blanca, 4,050 ft, 15 mi south
5

La Alianza’s year

La Alianza has a tropical rainforest climate. Summer afternoons average 91° in June; winter nights fall to about 64° in January. About 78 inches of rain fall in a normal year.

JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC 12 78.2 in
June, average91° / 70° · high / low, the warmest month
January, average85° / 64° · high / low, the coldest month
Rain a year78.2 in · wettest months: May and September
Hottest on record100°F · September 8, 1954
Coldest on record50°F · December 23, 1991
Wettest day on record9.63 in · December 10, 1965
90° days a year98 · none reach 100°
Climate typeTropical rainforest · Köppen Af
1Highs of 90° and up · May 28 to Oct. 23; normal highs reach 90°
2Wettest stretch · August through October: 26.3 of the year’s 78.2 inches
NOVEMBER 14 IN THE RECORD

On November 14 La Alianza normally reaches 87° and falls to 69°. The record high is 95°, in 1939; the record low 62°, in 1948. The most rain on this date, 3.44 in, fell in 1977.

Normals 1991–2020 and records since 1937 at Dos Bocas, 6 miles southwest, 420 ft lower. NOAA, through RCC-ACIS.