Alert archive / Puerto Rico / Flash Flood Warnings in 2021

Flash Flood Warning 16, NWS JSJ

October 18, 2021

NWS JSJ issued this flash flood warning at Oct 18, 2021, 5:12 PM CDT. It was in force for 78 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 18, 2021, 5:12 PM CDT (22:12 UTC)
Expired: Oct 18, 2021, 6:30 PM CDT
In force: 78 min
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 41 km from the middle of the area, began a volume at 22:11 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.

The text

As transmitted.

702 
WGCA52 TJSJ 182212
FFWSJU
PRC149-182330-
/O.NEW.TJSJ.FF.W.0016.211018T2212Z-211018T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
612 PM AST Mon Oct 18 2021

The National Weather Service in San Juan has issued a

* Flash Flood Warning for...
  Villalba in Puerto Rico...

* Until 730 PM AST.

* At 612 PM AST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts up to 1 inch are possible 
  in the warned area. Flash flooding is ongoing or expected to begin 
  shortly, mainly near communities along Rio Descalabrado and Rio 
  Jacaguas. Mudslides have been reported across these areas, and 
  will remain possible near areas of steep terrain.

  HAZARD...Flash flooding caused by thunderstorms and excessive
           runoff from previous rains.

  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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 1817 6643 1816 6643 1814 6642 1812 6643
      1810 6642 1809 6643 1808 6643 1808 6644
      1808 6646 1809 6648 1810 6650 1808 6651
      1809 6652 1811 6653 1812 6652 1813 6653
      1815 6652 1816 6650 1817 6648 1818 6647

FLASH FLOOD...RADAR INDICATED

$$

ICP

1 follow-up statement

933 
WGCA72 TJSJ 182326
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
726 PM AST Mon Oct 18 2021

PRC149-182336-
/O.EXP.TJSJ.FF.W.0016.000000T0000Z-211018T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Villalba PR-
726 PM AST Mon Oct 18 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 730 PM AST THIS EVENING FOR 
VILLALBA...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. However, excessive runoff continue 
to affect rivers and streams. Therefore, a Flood Advisory remains in 
effect until 8 PM AST. Please continue to heed remaining road 
closures.

LAT...LON 1817 6643 1816 6643 1814 6642 1812 6643
      1810 6642 1809 6643 1808 6643 1808 6644
      1808 6646 1809 6648 1810 6650 1808 6651
      1809 6652 1811 6653 1812 6652 1813 6653
      1815 6652 1816 6650 1817 6648 1818 6647

$$

ICP

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
Oct 18, 11:16 AM CDT	Areal Flood Advisory	JSJ	3 hr
Oct 18, 11:57 AM CDT	Areal Flood Advisory	JSJ	4 hr
Oct 18, 12:47 PM CDT	Areal Flood Advisory	JSJ	3 hr
Oct 18, 12:55 PM CDT	Areal Flood Advisory	JSJ	3 hr
Oct 18, 1:25 PM CDT	Areal Flood Advisory	JSJ	3 hr
Oct 18, 1:54 PM CDT	Areal Flood Advisory	JSJ	111 min
Oct 18, 4:04 PM CDT	Areal Flood Advisory	JSJ	3 hr

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; radar from the NEXRAD Level II archive.