SDG&E Weather Briefing

Friday, December 13, 2019

Safety Talking Point

Make a plan for the new year. Your poinsettia’s pooped and the gifts are all gone. Now what? It’s a great time to reset for the new year — but don’t go dashing through your to-do list too fast or you might not stick to your plan. Lay out realistic, sustainable steps for the months ahead. For example, start a daily walking routine and sign up for your local Heart Walk before you set your sights on that marathon!

Executive Summary

  • Changes since this morning’s issuance: Updated FPI table and details on next week’s potential rain
  • Warm and sunny today, becoming cloudy late this afternoon
  • Cooler temperatures and a slight chance for light rain/drizzle Saturday/Sunday
  • Breezy westerly winds this weekend, especially over mountain ridges and desert slopes
  • Weak to locally moderate Santa Ana winds early next week with minimal impacts
  • Potential for rain late Wednesday into Thursday – see forecast discussion for more information
  • The FPI will be Normal in all districts through the foreseeable future

Forecast Discussion

Temperatures today will be a little warmer than yesterday with plenty of sunshine, at least until the clouds roll in during the late afternoon/early evening. Tonight through the weekend, increased onshore flow will bring cooler temperatures and a slight chance for light rain or drizzle. While both days have potential for some dampness, it looks like Sunday will clear up in the afternoon. Valleys and foothills could accumulate up to a quarter inch over the weekend, with higher mountain locations receiving a little less. Coastal areas will have something more like drippy fog, with maybe a couple hundredths of an inch. Expect breezy conditions this weekend as well, particularly over the mountain ridges and desert slopes, which may see localized gusts up to 60 mph. Areas west of the mountains could potentially experience wind gusts of 20-25 mph. 

On Monday, winds will turn easterly, bringing in much drier air than we’ll experience over the weekend, but it won’t be much warmer. This is looking to be a weak to locally moderate Santa Ana, though we won’t see a significant change in fire potential due to higher fuel moistures and saturated ground conditions. 

***Update*** Our next chance for rain comes late Wednesday into Thursday, though there is still quite a bit of model discrepancy. At this time, it does not look like this would be an impactful event. 

Fire Discussion

Recent rainfall and periods of sunshine have initiated a new grass crop, helping reduce overall fire potential. Though we will continue to have periods of Santa Ana winds, greener grass and higher fuel moistures will keep the FPI in Normal for the foreseeable future. 

Today's Fire Potential Index (FPI)

ME RA EA NE OC NC BC CM
Normal

10

Normal

10

Normal

10

Normal

10

Normal

8

Normal

8

Normal

8

Normal

8

< 12 | Normal 12 - 14 | Elevated 15 - 17 | Extreme

7-Day FPI Outlook

  Fri
12/13
Sat
12/14
Sun
12/15
Mon
12/16
Tue
12/17
Wed
12/18
Thu
12/19
ME Normal

10

Normal

7

Normal

7

Normal

10

Normal

11

Normal

11

Normal

10

RA Normal

10

Normal

7

Normal

7

Normal

10

Normal

11

Normal

11

Normal

10

EA Normal

10

Normal

7

Normal

8

Normal

10

Normal

11

Normal

11

Normal

10

NE Normal

10

Normal

7

Normal

8

Normal

10

Normal

11

Normal

11

Normal

10

OC Normal

8

Normal

7

Normal

8

Normal

10

Normal

11

Normal

11

Normal

10

NC Normal

8

Normal

7

Normal

8

Normal

10

Normal

11

Normal

11

Normal

10

BC Normal

8

Normal

7

Normal

8

Normal

10

Normal

11

Normal

11

Normal

10

CM Normal

8

Normal

7

Normal

8

Normal

10

Normal

11

Normal

11

Normal

10

Forecast Weather Legend

< 12 | Normal 12 - 14 | Elevated 15 - 17 | Extreme

Latest 7-Day Forecast

Fri
12/13
Sat
12/14
Sun
12/15
Mon
12/16
Tue
12/17
Wed
12/18
Thu
12/19
EXPECTED WEATHER CONDITIONS
sunny
cloudy
partly cloudy
sunny
sunny
partly cloudy
cloudy
BEACHES
53/69 54/64 51/65 47/67 50/67 53/65 53/65
MESAS
53/73 51/64 47/66 45/67 46/67 48/66 49/65
MIRAMAR
51/74 51/65 46/67 44/68 45/69 46/66 48/65
INLAND ORANGE COUNTY
52/70 52/66 48/62 44/65 45/66 46/66 46/64
INLAND VALLEY
49/76 49/64 46/65 44/68 44/68 45/66 46/65
FOOTHILLS
44/73 42/62 38/62 36/64 38/65 39/63 39/62
MOUNTAINS
46/66 36/54 36/45 35/46 37/45 37/48 39/47
DESERTS
47/73 52/74 47/68 41/65 40/64 40/64 42/65
BACKCOUNTRY WINDS
15 22 23 27 33 19 12
CHANCE OF PRECIPITATION
0% 20% 15% 0% 0% 40% 50%

Forecast Weather Legend

High Heat (above 95F) Illness Prevention measures are mandated by Safety Standard G 8366: Pre-shift meeting to review preventive, cool down, and communication measures; Shade & 1 quart of cool water per hour per crew member required. Supervisors to observe for employee heat illnesses, or use a buddy system or regular communication with sole employees. Shading indicates Heat Illness Prevention (heat wave at or above 80F) measures are mandated by Safety Standard G 8366: Shade & 1 quart of cool water per hour per crew member required. Supervisors to observe for employee heat illinesses.
Shading Indicates low temperatures in this region are expected to be at 40 degrees Fahrenheit or lower Shading Indicates low temperatures in this region are expected to be at 32 degrees Fahrenheit or lower

Tide Report

LA JOLLA, SCRIPPS PIER, CALIFORNIA

Almanac

SAN DIEGO, CALIFORNIA

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