Alert archive / Puerto Rico / Flash Flood Warnings in 2023

Flash Flood Warning 49, NWS JSJ

October 21, 2023

NWS JSJ issued this flash flood warning at Oct 21, 2023, 3:09 PM CDT. It was in force for 45 min. 1 report 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: Oct 21, 2023, 3:09 PM CDT (20:09 UTC)
Expired: Oct 21, 2023, 3:54 PM CDT
In force: 45 min
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 27 km from the middle of the area, began a volume at 20:11 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.

What was reported inside it

Time	Report	Where	Remark
Oct 21, 3:13 PM CDT	FLASH FLOOD	3 W Trujillo Alto, PR	Emergency managers reported PR-199, in front of Galeria Paseos in San Juan is impassable. No people trapped.

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

The text

As transmitted.

539 
WGCA52 TJSJ 212009
FFWSJU
PRC061-127-212200-
/O.NEW.TJSJ.FF.W.0049.231021T2009Z-231021T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
409 PM AST Sat Oct 21 2023

The National Weather Service in San Juan has issued a

* Flash Flood Warning for...
  Guaynabo and San Juan

* Until 600 PM AST.

* At 409 PM AST, Doppler radar indicated heavy rain across the 
  warned area. Between 1 and 2 inches of rain have fallen. 
  Additional rainfall amounts up to 2 inches are possible in the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by heavy rain.

  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 1831 6614 1832 6614 1833 6614 1834 6613
      1836 6614 1838 6613 1838 6612 1839 6612
      1841 6612 1843 6606 1839 6600 1838 6601
      1838 6603 1837 6603 1832 6604 1831 6607
      1830 6613

FLASH FLOOD...RADAR INDICATED

$$

OMS

1 follow-up statement

621 
WGCA72 TJSJ 212054
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
454 PM AST Sat Oct 21 2023

PRC061-127-212104-
/O.CAN.TJSJ.FF.W.0049.000000T0000Z-231021T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Guaynabo PR-San Juan PR-
454 PM AST Sat Oct 21 2023

...FLASH FLOOD WARNING IS CANCELLED FOR GUAYNABO AND SAN JUAN 
COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 1831 6614 1832 6614 1833 6614 1834 6613
      1836 6614 1838 6613 1838 6612 1839 6612
      1841 6612 1843 6606 1839 6600 1838 6601
      1838 6603 1837 6603 1832 6604 1831 6607
      1830 6613

$$

OMS

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
Oct 21, 1:17 PM CDT	Areal Flood Advisory	JSJ	2 hr
Oct 21, 2:20 PM CDT	Areal Flood Advisory	JSJ	85 min
Oct 21, 3:49 PM CDT	Areal Flood Advisory	JSJ	68 min
Oct 21, 4:55 PM CDT	Areal Flood Warning	JSJ	3 hr

Nearby

Flash Flood Warnings in Puerto Rico, 2023 Every flash flood warning in 2023

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.