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Atlantic Hurricane Season 2018 Storm Names

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National Weather Service Today's Weather Impact Levels

National Weather Service Five Day Forecast for: San Juan, Puerto Rico  

Updated: 10:56 pm AST Sep 20, 2018 

Hazardous Weather Outlook
 

Overnight

Overnight: Isolated showers.  Partly cloudy, with a low around 78. East southeast wind around 10 mph.  Chance of precipitation is 20%.
Isolated
Showers
Friday

Friday: Sunny, with a high near 91. East wind 9 to 13 mph.
Sunny

Friday
Night
Friday Night: Scattered showers.  Partly cloudy, with a low around 78. East northeast wind 9 to 11 mph.  Chance of precipitation is 40%.
Scattered
Showers
Saturday

Saturday: Scattered showers, mainly before 1pm.  Mostly sunny, with a high near 89. East wind 8 to 11 mph.  Chance of precipitation is 40%.
Scattered
Showers
Saturday
Night
Saturday Night: Isolated showers.  Partly cloudy, with a low around 78. East northeast wind 7 to 10 mph.  Chance of precipitation is 20%.
Isolated
Showers
Sunday

Sunday: Scattered showers, with thunderstorms also possible after 1pm.  Mostly sunny, with a high near 90. East wind 8 to 13 mph.  Chance of precipitation is 30%.
Scattered
Showers
Sunday
Night
Sunday Night: Partly cloudy, with a low around 78. East wind around 9 mph.
Partly Cloudy

Monday

Monday: Scattered showers, mainly after 1pm.  Mostly sunny, with a high near 91. East wind 9 to 13 mph.  Chance of precipitation is 40%.
Sunny then
Scattered
Showers
Monday
Night
Monday Night: Scattered showers.  Partly cloudy, with a low around 78. East wind 9 to 11 mph.  Chance of precipitation is 30%.
Scattered
Showers
Lo 78 °FHi 91 °FLo 78 °FHi 89 °FLo 78 °FHi 90 °FLo 78 °FHi 91 °FLo 78 °F

National Weather Service Forecast Details

 

 

INVEST 99L

 

Forecasting Models

 

INVEST 97L

 

 

 

Forecasting Models

 

Caribbean Sea Satellite

 

GRLevel3 Radar

  [10/10
GRLevel3 radar from NWS station TJUA

 

NWS San Juan TJUA Doppler Radar

 

Weather Summary for Puerto Rico

084
AWCA82 TJSJ 202017
RWSPR

Weather Summary for Puerto Rico
National Weather Service San Juan PR
417 PM AST Thu Sep 20 2018

A weak tropical wave left shower activity across the southwest,
and southeast quadrant of Puerto Rico early this morning. Then,
skies turned hazy as a dense Saharan Air Layer moved through the
region. A few short fuse rains were detected with the Doppler
Radar but in general no shower activity was observed over land
today. High temperatures were in the low and mid 90s along the
coastal areas and in the mid 80s along the mountain areas. The
wind was mainly from the east-southeast at 15 to 20 knots with sea
breeze variations.

Satellite imagery and model guidance are indicating dry and dusty
conditions through at least Friday. This air mass combined with a
mid to upper level ridge will limit shower activity and will
result in hazy skies through at least the end of the work-week.
Short life rainfall activity should not be ruled out mainly over
west PR Friday afternoon.

Seas will range between 4 and 6 feet with east southeast winds at
15 to 20 knots mainly across the Atlantic Offshore waters,
Caribbean waters and Mona Passage. Therefore, small boat
operators should exercise caution across these waters. Elsewhere
seas and winds are forecast to slowly return between 2 and 5 feet
and around 15 knots, respectively.

$$

This product is issued around 5 AM and 5 PM each day and weather
conditions may change between issuances. Please verify the status
of any Watches...Warnings or Advisories mentioned in this product.

NWS SJU Office Area Forecast Discussion

 

 

Tropical Weather Outlook

 

 

 

 

Satellite Imagery

alt

Select a map type to view:

 

Long-wave Infrared Imagery for Atlantic Ocean (GOES16)

Courtesy of College of Dupage

 

Global Tropics Hazards and Benefits Outlook (Click image for more details)

 

Saharan Air Layer

 

Wind Shear Tendency

 

Sea Surface Temperatures

 

Sea Surface Temperatures Anomalies

 

MJO Forecast

 

 


 


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