Alert archive / Puerto Rico / Flash Flood Warnings in 2021

Flash Flood Warning 11, NWS JSJ

August 4, 2021

NWS JSJ issued this flash flood warning at Aug 4, 2021, 12:18 PM CDT. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 4, 2021, 12:18 PM CDT (17:18 UTC)
Expired: Aug 4, 2021, 3:15 PM CDT
In force: 3 hr
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 30 km from the middle of the area, began a volume at 17:17 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.

982 
WGCA52 TJSJ 041718
FFWSJU
PRC127-041815-
/O.NEW.TJSJ.FF.W.0011.210804T1718Z-210804T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
118 PM AST Wed Aug 4 2021

The National Weather Service in San Juan has issued a

* Flash Flood Warning for...
  San Juan in Puerto Rico...

* Until 215 PM AST.

* At 118 PM AST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 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.

&&

LAT...LON 1841 6610 1844 6604 1842 6602 1838 6600
      1838 6601 1838 6602 1838 6603 1837 6603
      1836 6603 1834 6608 1837 6609 1838 6609
      1838 6610

FLASH FLOOD...RADAR INDICATED

$$

DSR

3 follow-up statements

595 
WGCA52 TJSJ 041806
FFWSJU
PRC127-041915-
/O.EXT.TJSJ.FF.W.0011.000000T0000Z-210804T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
206 PM AST Wed Aug 4 2021

The National Weather Service in San Juan has extended the

* Flash Flood Warning for...
  San Juan in Puerto Rico...

* Until 315 PM AST.

* At 206 PM AST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing.

  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.

&&

LAT...LON 1841 6610 1844 6604 1842 6602 1838 6600
      1838 6601 1838 6602 1838 6603 1837 6603
      1836 6603 1834 6608 1837 6609 1838 6609
      1838 6610

FLASH FLOOD...RADAR INDICATED

$$

GL

070 
WGCA52 TJSJ 041909
FFWSJU
PRC127-042015-
/O.EXT.TJSJ.FF.W.0011.000000T0000Z-210804T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
309 PM AST Wed Aug 4 2021

The National Weather Service in San Juan has extended the

* Flash Flood Warning for...
  San Juan in Puerto Rico...

* Until 415 PM AST.

* At 309 PM AST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 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.

&&

LAT...LON 1841 6610 1844 6604 1842 6602 1838 6600
      1838 6601 1838 6602 1838 6603 1837 6603
      1836 6603 1834 6608 1837 6609 1838 6609
      1838 6610

FLASH FLOOD...RADAR INDICATED

$$

CRS

675 
WGCA72 TJSJ 042010
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
410 PM AST Wed Aug 4 2021

PRC127-042020-
/O.EXP.TJSJ.FF.W.0011.000000T0000Z-210804T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan PR-
410 PM AST Wed Aug 4 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 415 PM AST THIS AFTERNOON FOR 
SAN JUAN...

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

LAT...LON 1841 6610 1844 6604 1842 6602 1838 6600
      1838 6601 1838 6602 1838 6603 1837 6603
      1836 6603 1834 6608 1837 6609 1838 6609
      1838 6610

$$

CRS

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
Aug 4, 11:29 AM CDT	Areal Flood Advisory	JSJ	2 hr
Aug 4, 12:25 PM CDT	Areal Flood Advisory	JSJ	5 hr
Aug 4, 1:14 PM CDT	Special Weather Statement	JSJ	31 min
Aug 4, 1:43 PM CDT	Special Weather Statement	JSJ	32 min
Aug 4, 2:01 PM CDT	Areal Flood Advisory	JSJ	3 hr
Aug 4, 2:07 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.