Alert archive / Puerto Rico / Flash Flood Warnings in 2021

Flash Flood Warning 12, NWS JSJ

September 3, 2021

NWS JSJ issued this flash flood warning at Sep 3, 2021, 4:32 PM CDT. It was in force for 103 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 3, 2021, 4:32 PM CDT (21:32 UTC)
Expired: Sep 3, 2021, 6:15 PM CDT
In force: 103 min
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 76 km from the middle of the area, began a volume at 21:31 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Sep 3, 4:40 PM CDT	FLOOD	Arecibo, PR	EMERGENCY MANAGERS REPORTED TWO LINES OF ROAD 2 NEAR FONDO SEGURO DEL ESTADO FLOODED.
Sep 3, 4:40 PM CDT	FLASH FLOOD	Arecibo, PR	EMERGENCY MANAGERS REPORTED CANO SANTIAGO OUT OF ITS BANKS, 3 HOUSES WERE EVACUATED AT PARCELAS OLMOS.
Sep 3, 4:40 PM CDT	FLASH FLOOD	Arecibo, PR	EMERGENCY MANAGERS REPORTED ROAD 129 IMPASSABLE NEAR CESCO.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The text

As transmitted.

247 
WGCA52 TJSJ 032132
FFWSJU
PRC013-065-032315-
/O.NEW.TJSJ.FF.W.0012.210903T2132Z-210903T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
532 PM AST Fri Sep 3 2021

The National Weather Service in San Juan has issued a

* Flash Flood Warning for...
  Arecibo in Puerto Rico...
  Hatillo in Puerto Rico...

* Until 715 PM AST.

* At 532 PM AST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. The expected rainfall rate is 1 inch in 1 hour. 
  Additional rainfall amounts of 1 to 2 inches are possible in the 
  warned area. Flash flooding is already occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Arecibo, Hatillo, Camuy, Bajadero, Rafael Capo, Rafael Gonzalez, 
  La Alianza, Animas, Corcovado, Sabana Hoyos and Carrizales.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Move to higher ground now. Act quickly to protect your life.

&&

LAT...LON 1849 6684 1849 6680 1847 6671 1849 6667
      1849 6658 1848 6659 1847 6659 1847 6658
      1840 6659 1834 6659 1832 6671 1835 6673
      1833 6676 1832 6677 1832 6683 1839 6681
      1841 6682 1847 6683 1848 6683

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1 INCH IN 1 HOUR

$$

TW

1 follow-up statement

142 
WGCA72 TJSJ 032310
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
710 PM AST Fri Sep 3 2021

PRC013-065-032320-
/O.EXP.TJSJ.FF.W.0012.000000T0000Z-210903T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Arecibo PR-Hatillo PR-
710 PM AST Fri Sep 3 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 715 PM AST THIS EVENING FOR 
ARECIBO AND HATILLO...

The heavy rain has ended. However, standing water still remains on 
the roadways. Flooding is no longer expected to pose a threat. 
Please continue to heed remaining road closures.

LAT...LON 1849 6684 1849 6680 1847 6671 1849 6667
      1849 6658 1848 6659 1847 6659 1847 6658
      1840 6659 1834 6659 1832 6671 1835 6673
      1833 6676 1832 6677 1832 6683 1839 6681
      1841 6682 1847 6683 1848 6683

$$

TW

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
Sep 3, 1:28 PM CDT	Areal Flood Advisory	JSJ	115 min
Sep 3, 2:48 PM CDT	Areal Flood Advisory	JSJ	104 min
Sep 3, 3:24 PM CDT	Areal Flood Advisory	JSJ	58 min

Nearby

Flash Flood Warnings in Puerto Rico, 2021 Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; radar from the NEXRAD Level II archive.