Flood, Mayaguez
- When
- December 1, 5:45 PM AST to 7:45 PM AST
- Where
- Mayaguez County, 1.45 mi WNW of Mayaguez to 1.32 mi WNW of Mayaguez
- Cause
- Heavy Rain
- Reported by
- Public
- Coordinates
- 18.207, -67.141
Urban flooding was reported at downtown Mayaguez.
Flood in Puerto Rico, December 1, 2012
A surge of low to mid level moisture accompanying an easterly perturbation, combined with daytime heating and local effects to produced scattered to numerous showers with thunderstorms mainly across the western interior and west sections of Puerto Rico.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 1
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
What happened
The episode as NWS SJU wrote it up.
A surge of low to mid level moisture accompanying an easterly perturbation, combined with daytime heating and local effects to produced scattered to numerous showers with thunderstorms mainly across the western interior and west sections of Puerto Rico.
What forecasters said that day
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Juan, PR wrote its last area forecast discussion before the first event at Dec 1, 3:18 PM AST, 2 hours 27 minutes earlier.
Area forecast discussion, Dec 1, 3:18 PM AST, 2 hours 27 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN JUAN PR
318 PM AST SAT DEC 1 2012
.SYNOPSIS...BROAD MID-UPPER TROUGH WILL DOMINATE THE WESTERN
ATLANTIC INTO THE CARIBBEAN THROUGH ALL OF NEXT WEEK. INVERTED
SURFACE TROUGH WILL BECOME BETTER ORGANIZED TONIGHT THROUGH SUNDAY
AND PUSH SE OF THE AREA BY MONDAY.
&&
.DISCUSSION...SCATTERED TO NUMEROUS SHOWERS WITH ISOLATED
THUNDERSTORMS DEVELOPED THIS AFTERNOON MAINLY ACROSS THE EASTERN
INTERIOR AND CENTRAL INTERIOR SECTIONS OF PUERTO RICO. THIS
ACTIVITY WAS PRIMARILY ASSOCIATED WITH THE COMBINATION OF DAYTIME
HEATING AND OROGRAPHIC EFFECTS AND A BROAD MID UPPER TROUGH WHICH
IS LOCATED ACROSS THE WESTERN ATLANTIC. ALSO...AN INVERTED TROUGH
IS EXPECTED TO MOVE ACROSS THE REGION TONIGHT AND SUNDAY. ALL
THESE FACTORS PROMISE TO MAINTAIN ACTIVE WEATHER ACROSS THE AREA.
THEREFORE...A FLASH FLOOD WATCH CONTINUES IN EFFECT FOR THE
EASTERN HALF OF PUERTO RICO AND THE U.S. VIRGIN ISLANDS. LATEST
12Z GFS90 COMPUTER MODEL INDICATED THETAE VALUES AT 700MB OF OVER
330K THROUGH MONDAY. IS NOT UNTIL MID WEEK...MODEL SHOWS A DRYING
TREND...AS HIGH PRESSURE BUILDS NORTH OF THE AREA. PW VALUES ARE
FORECAST TO DROP AS LOW AS 1.3 INCHES BY NEXT THURSDAY.
&&
.AVIATION...MVFR CONDITIONS WILL PREVAIL ACROSS TJMZ THROUGH AT
LEAST 01/22Z. BRIEF PERIODS OF MVFR CONDITIONS ARE POSSIBLE TO
OCCUR LATER TONIGHT OVER TIST...TISX AND TJSJ AS SURFACE TROUGH
MOVES OVER THE AREA. ELSEWHERE...VFR CONDITIONS ARE EXPECTED.
&&
.MARINE...SHOWERS AND THUNDERSTORMS WILL BE MOVING ACROSS THE
LOCAL WATERS LOWERING VISIBILITIES AND INCREASING WINDS...MAINLY
NEAR STRONGEST SHOWERS AND THUNDERSTORMS. SEAS AND WINDS ARE
EXPECTED TO INCREASE ON MONDAY AS A NORTHERLY SWELL REACH OUR LOCAL
WATERS...GENERATING CONFUSE SEAS THROUGH MID WEEK.
&&
.PRELIMINARY POINT TEMPS/POPS...
SJU 79 83 73 83 / 80 70 30 30
STT 80 80 79 80 / 80 60 30 30
&&
.SJU WATCHES/WARNINGS/ADVISORIES...
PR...FLASH FLOOD WATCH THROUGH SUNDAY EVENING FOR CENTRAL INTERIOR-
CULEBRA-EASTERN INTERIOR-NORTH CENTRAL-NORTHEAST-SAN JUAN
AND VICINITY-SOUTHEAST-VIEQUES.
VI...FLASH FLOOD WATCH THROUGH SUNDAY EVENING FOR ST CROIX-ST.
THOMAS/ST. JOHN/ADJACENT ISLANDS.
COASTAL WATERS...
&&
15/10/71Hazardous weather outlook, Dec 1, 4:55 AM AST, 12 hours 50 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN JUAN PR 455 AM AST SAT DEC 1 2012 AMZ710>745-PRZ001>013-020900- SAN JUAN AND VICINITY-NORTHEAST-SOUTHEAST-EASTERN INTERIOR- NORTH CENTRAL-CENTRAL INTERIOR-PONCE AND VICINITY-NORTHWEST- WESTERN INTERIOR-MAYAGUEZ AND VICINITY-SOUTHWEST-CULEBRA-VIEQUES- THE NEARSHORE AND OFF SHORE ATLANTIC AND CARIBBEAN COASTAL WATERS- 455 AM AST SAT DEC 1 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PUERTO RICO AND THE ADJACENT ATLANTIC COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SURFACE TROUGH WILL DEVELOP ACROSS THE LOCAL ISLANDS...ENHANCING THE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS THIS AFTERNOON. URBAN FLOODING LIKELY. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY AS THE AFOREMENTIONED TROUGH BECOMES BETTER ORGANIZED...EXPECT SHOWERS AND THUNDERSTORMS TO BECOME MORE FREQUENT AND HEAVIER ESPECIALLY ACROSS NORTHEAST PUERTO RICO ON SUNDAY. THREE TO SIX INCHES OF RAIN ARE LIKELY OVER NORTHEAST PUERTO RICO THROUGH SUNDAY WHICH COULD RESULT IN FLOODING. .SPOTTER INFORMATION STATEMENT...SPOTTER ACTIVATION WILL NOT BE NEEDED THIS MORNING. AMZ715-725-VIZ001-002-020900- ST. THOMAS ST. JOHN ADJACENT ISLANDS-ST CROIX- NEARSHORE ATLANTIC AND ADJACENT CARIBBEAN COASTAL WATERS- 455 AM AST SAT DEC 1 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE U.S. VIRGIN ISLANDS AND THE ADJACENT COASTAL WATERS. .DAY ONE...TODAY AND TONIGHT SURFACE TROUGH WILL DEVELOP ACROSS THE LOCAL ISLANDS...ENHANCING THE DEVELOPMENT OF SHOWERS AND THUNDERSTORMS THIS AFTERNOON. URBAN FLOODING LIKELY. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY AS THE AFOREMENTIONED TROUGH BECOMES BETTER ORGANIZED...EXPECT SHOWERS AND THUNDERSTORMS TO BECOME MORE FREQUENT AND HEAVIER ON SUNDAY. THREE TO SIX INCHES OF RAIN ARE LIKELY OVER THE LOCAL ISLANDS THROUGH SUNDAY WHICH COULD RESULT IN FLOODING. .SPOTTER INFORMATION STATEMENT...SPOTTER ACTIVATION WILL NOT BE NEEDED THIS MORNING.
In the hours before
Local storm report, Dec 1, 5:45 PM AST, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN JUAN PR
545 PM AST SAT DEC 01 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0541 PM FLOOD MAYAGUEZ 18.20N 67.14W
12/01/2012 MAYAGUEZ PR PUBLIC
URBAN FLOODING WAS REPORTED IN DOWNTOWN MAYAGUEZ.
&&
FCASTROThe radar
The national radar mosaic for the moment the first event began.
Event by event
1 flood. Local standard time, as filed.
What these are
- Flood
- Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Drought in Texas, December 1 to 31, 2012
- Drought in Texas, December 1 to 31, 2012
- Drought in Oklahoma, December 1 to 31, 2012
- Flooding and High Wind in California, December 1 to 2, 2012
- Winter Storm and Heavy Snow in Montana, December 1 to 2, 2012
- Drought in Texas, December 1 to 31, 2012
- Drought in Oklahoma, December 1 to 31, 2012
- High Wind in Nevada, December 1 to 2, 2012
- Drought in New Mexico, December 1 to 31, 2012
- Drought in Nebraska, December 1 to 31, 2012
- Drought in Arkansas, December 1 to 31, 2012
- Drought in Missouri, December 1 to 31, 2012
More
Every storm in Puerto Rico in 2012Every state in 2012This day in weather historyWarnings in Puerto Rico, December 2012
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 421317.