Alert archive / Puerto Rico / Areal Flood Advisories in 2021

Areal Flood Advisory 321, NWS JSJ

September 21, 2021

NWS JSJ issued this areal flood advisory at Sep 21, 2021, 5:39 PM CDT. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Sep 21, 2021, 5:39 PM CDT (22:39 UTC)
Expired
Sep 21, 2021, 8:45 PM CDT
In force
3 hr
Issued by
NWS JSJ
Area
Storm-based polygon

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS JSJ wrote its last area forecast discussion before this areal flood advisory went out at Sep 21, 3:27 PM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, Sep 21, 3:27 PM CDT, 2 hours 12 minutes before
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Hazardous weather outlook, Sep 21, 4:06 AM CDT, 13 hours 33 minutes before
Hazardous Weather Outlook...CORRECTED
National Weather Service San Juan PR
506 AM AST Tue Sep 21 2021

AMZ710>745-PRZ001>013-220845-
San Juan and Vicinity-Northeast-Southeast-Eastern Interior-
North Central-Central Interior-Ponce and Vicinity-Northwest-
Western Interior-Mayaguez and Vicinity-Southwest-Culebra-Vieques-
The nearshore and off shore Atlantic and Caribbean Coastal Waters-
506 AM AST Tue Sep 21 2021

This Hazardous Weather Outlook is for Puerto Rico and the adjacent
Atlantic Coastal Waters.

.Day One...Today and Tonight

.Thunderstorms...There is a chance of thunderstorms with heavy
rainfall and brief gusty winds across portions of the area today.

.Flooding...Heavy rains could lead to urban and small stream
flooding as well as ponding of water on roads and in poor drainage
areas.

.Waves...Choppy/Rough seas up to 7 feet expected across the offshore
Atlantic waters.

.Rip Currents...There is a high risk of rip currents for some beaches
across north central Puerto Rico. Elsewhere, there is a moderate risk
of rip currents for north and east facing beaches in Puerto Rico,
including Vieques and Culebra.

.Heat...Maximum heat indices between 100 and 106 degrees possible in
urban and coastal areas of Puerto Rico this afternoon.

.Days Two through Seven...Wednesday through Monday

Afternoon thunderstorm activity expected at least through Monday and
therefore there will remain a slight threat for urban and small stream
flooding mainly over western PR. The slightly elevated heat threat is
expected to continue over the forecast area with maximum heat index
values in the low to mid 100s at least through Monday. A moderate risk
of rip currents will remain for most of the northern and eastern
local beaches through the weekend.

.Spotter information statement...

Spotter activation is not anticipated. Please relay any information
about winds, waves, and rip currents to the National Weather Service
in San Juan while following all local and state guidelines.

AMZ715-725-VIZ001-002-220845-
St. Thomas St. John adjacent Islands-St Croix-
Nearshore Atlantic and adjacent Caribbean Coastal Waters-
506 AM AST Tue Sep 21 2021

This Hazardous Weather Outlook is for the U.S. Virgin Islands and the
adjacent Coastal Waters.

.Day One...Today and Tonight

.Thunderstorms...There is a chance of thunderstorms with heavy
rainfall and brief gusty winds across the local islands today.

.Flooding...Heavy rains could lead to urban and small stream
flooding as well as ponding of water on roads and in poor drainage
areas.

.Rip Currents...There is a moderate risk of rip currents for
northern and eastern local beaches in St. Croix as well as western
beaches in St.Thomas today.

.Heat...Maximum heat indices in the low 100s possible across the
eastern tip of St. John this afternoon.

.Days Two through Seven...Wednesday through Monday

The slightly elevated heat threat is expected to continue over the
forecast area with maximum heat index values in the low 100s at least
through Saturday. All local beaches will have a low risk of rip
currents on Wednesday, but will become moderate on Thursday through
the weekend.

.Spotter information statement...

Spotter activation is not anticipated. Please relay any information
about winds, waves, and rip currents to the National Weather Service
in San Juan while following all local and state guidelines.

The office that day

Everything else NWS JSJ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 21, 2:56 AM CDTRip Current StatementJSJ38 hr
Sep 21, 2:04 PM CDTAreal Flood AdvisoryJSJ3 hr
Sep 21, 3:07 PM CDTAreal Flood AdvisoryJSJ113 min
Sep 21, 3:35 PM CDTAreal Flood AdvisoryJSJ3 hr
Sep 21, 5:17 PM CDTAreal Flood AdvisoryJSJ58 min
Sep 21, 5:31 PM CDTAreal Flood AdvisoryJSJ3 hr
Sep 21, 6:20 PM CDTAreal Flood AdvisoryJSJ115 min

Nearby

Areal Flood Advisories in Puerto Rico, 2021Every areal flood advisory 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.