Alert archive / Puerto Rico / Flash Flood Warnings in 2021

Flash Flood Warning 15, NWS JSJ

October 16, 2021

NWS JSJ issued this flash flood warning at Oct 16, 2021, 1:06 PM CDT. It was in force for 75 min. 6 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: Oct 16, 2021, 1:06 PM CDT (18:06 UTC)
Expired: Oct 16, 2021, 2:21 PM CDT
In force: 75 min
Issued by: NWS JSJ
Area: Storm-based polygon
Flood severity: None

The radar

The San Juan radar (TJUA), 32 km from the middle of the area, began a volume at 18:07 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 16, 1:20 PM CDT	FLOOD	San Juan, PR	FLOODING REPORTED ALONG CALLE 34 IN TERRAZAS DE CUPEY.
Oct 16, 1:20 PM CDT	FLOOD	San Juan, PR	FLOODING REPORTED ALONG CALLE SAN GERNARO IN THE URBANIZATION OF SAGRADO CORAZON.
Oct 16, 1:20 PM CDT	FLOOD	San Juan, PR	SMALL STREAM IN THE URBANIZATION OF VILLA NEVARES WENT OUT OF ITS BANKS, FLOODING CALLE 5.
Oct 16, 1:20 PM CDT	FLASH FLOOD	San Juan, PR	FLOODING REPORTED ALONG AVE DE DIEGO BELOW THE BRIDGE OF EXPRESSO 22, TRAPPING ONE PERSON.
Oct 16, 1:30 PM CDT	FLASH FLOOD	San Juan, PR	TWO PEOPLE TRAPPED INSIDE A VEHICLE IN CALLE 5 INTERSECTION WITH CALLE 16SE IN URBANIZATION CAPPARA TERRACE DUE TO FLOODING FROM A SMALL STREAM GOING OUT OF ITS BANKS.
Oct 16, 1:56 PM CDT	FLASH FLOOD	San Juan, PR	A VEHICLE WITH PEOPLE INSIDE WAS TRAPPED IN EXPRESSO LAS AMERICAS, EXIT 5B, IN THE DIRECTION FROM CAGUAS TO SAN JUAN.

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

The text

As transmitted.

771 
WGCA52 TJSJ 161806
FFWSJU
PRC127-162115-
/O.NEW.TJSJ.FF.W.0015.211016T1806Z-211016T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Juan PR
206 PM AST Sat Oct 16 2021

The National Weather Service in San Juan has issued a

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

* Until 515 PM AST.

* At 206 PM AST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 1 to 2 inches in 1 
  hours. 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 1844 6608 1843 6604 1847 6613 1847 6612
      1845 6604 1843 6603 1840 6599 1838 6600
      1837 6603 1830 6605 1830 6608 1834 6610
      1836 6609 1843 6611 1844 6609

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 2 HOURS

$$

CAM

1 follow-up statement

536 
WGCA72 TJSJ 161921
FFSSJU

Flash Flood Statement
National Weather Service San Juan PR
321 PM AST Sat Oct 16 2021

PRC127-161931-
/O.CAN.TJSJ.FF.W.0015.000000T0000Z-211016T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Juan PR-
321 PM AST Sat Oct 16 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SAN JUAN...

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

LAT...LON 1844 6608 1843 6604 1847 6613 1847 6612
      1845 6604 1843 6603 1840 6599 1838 6600
      1837 6603 1830 6605 1830 6608 1834 6610
      1836 6609 1843 6611 1844 6609

$$

ICP

The office that day

Everything else NWS JSJ issued on the same UTC day.

Issued	Product	Office	Lasted
Oct 16, 12:44 PM CDT	Areal Flood Advisory	JSJ	3 hr
Oct 16, 1:21 PM CDT	Areal Flood Advisory	JSJ	2 hr
Oct 16, 1:47 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; local storm reports from the same archive; radar from the NEXRAD Level II archive.