Alert archive / Puerto Rico / Flash Flood Warnings in 2023

Flash Flood Warning 21, NWS JSJ

May 21, 2023

NWS JSJ issued this flash flood warning at May 21, 2023, 10:48 PM CDT. It was in force for 3 hr. 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: May 21, 2023, 10:48 PM CDT (03:48 UTC)
Expired: May 22, 2023, 1:54 AM CDT
In force: 3 hr
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 61 km from the middle of the area, began a volume at 03:47 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
May 21, 11:00 PM CDT	HEAVY RAIN 2.45	5 Ne Marueno, PR	MESONET STATION PCEP4 5.2 NE MARUENO.

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

The text

As transmitted.

241 
WGCA52 TJSJ 220348
FFWSJU
PRC111-113-220700-
/O.NEW.TJSJ.FF.W.0021.230522T0348Z-230522T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
1148 PM AST Sun May 21 2023

The National Weather Service in San Juan has issued a

* Flash Flood Warning for...
  Penuelas County in Puerto Rico...
  Ponce County in Puerto Rico...

* Until 300 AM AST.

* At 1148 PM AST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 4 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 1811 6673 1813 6672 1813 6668 1815 6667
      1816 6665 1815 6663 1817 6659 1815 6655
      1813 6657 1800 6653 1797 6654 1796 6661
      1798 6664 1797 6667 1800 6674 1798 6676
      1813 6677

FLASH FLOOD...RADAR INDICATED

$$

CVB

2 follow-up statements

010 
WGCA72 TJSJ 220613
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
213 AM AST Mon May 22 2023

PRC111-113-220700-
/O.CON.TJSJ.FF.W.0021.000000T0000Z-230522T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Penuelas PR-Ponce PR-
213 AM AST Mon May 22 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 3 AM AST EARLY THIS 
MORNING FOR PENUELAS AND PONCE COUNTIES...

At 213 AM AST, Doppler radar indicated that heavy rain has decreased 
across the warned area. Between 4 and 6 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.

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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 1811 6673 1813 6672 1813 6668 1815 6667
      1816 6665 1815 6663 1817 6659 1815 6655
      1813 6657 1800 6653 1797 6654 1796 6661
      1798 6664 1797 6667 1800 6674 1798 6676
      1813 6677

FLASH FLOOD...RADAR INDICATED

$$

CVB

740 
WGCA72 TJSJ 220654
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
254 AM AST Mon May 22 2023

PRC111-113-220704-
/O.CAN.TJSJ.FF.W.0021.000000T0000Z-230522T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Penuelas PR-Ponce PR-
254 AM AST Mon May 22 2023

...FLASH FLOOD WARNING FOR PENUELAS AND PONCE HAS BEEN REPLACED WITH 
A FLOOD ADVISORY...

Light to moderate rain continues along with excessive runoff. 

LAT...LON 1811 6673 1813 6672 1813 6668 1815 6667
      1816 6665 1815 6663 1817 6659 1815 6655
      1813 6657 1800 6653 1797 6654 1796 6661
      1798 6664 1797 6667 1800 6674 1798 6676
      1813 6677

$$

CVB

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
May 21, 9:02 PM CDT	Areal Flood Advisory	JSJ	5 hr
May 21, 10:36 PM CDT	Areal Flood Advisory	JSJ	3 hr
May 21, 11:41 PM CDT	Areal Flood Advisory	JSJ	5 hr
May 22, 12:14 AM CDT	Flash Flood Warning	JSJ	5 hr
May 22, 12:26 AM CDT	Flash Flood Warning	JSJ	4 hr
May 22, 12:52 AM CDT	Areal Flood Advisory	JSJ	4 hr
May 22, 1:54 AM CDT	Areal Flood Advisory	JSJ	111 min
May 22, 2:02 AM CDT	Areal Flood Advisory	JSJ	3 hr
May 22, 4:54 AM CDT	Areal Flood Advisory	JSJ	3 hr
May 22, 12:42 PM CDT	Special Marine Warning	JSJ	48 min
May 22, 1:04 PM CDT	Special Weather Statement	JSJ	26 min
May 22, 3:14 PM CDT	Special Weather Statement	JSJ	46 min
May 22, 4:16 PM CDT	Special Marine Warning	JSJ	59 min

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.