SDG&E Weather Briefing

Friday, May 17, 2019

Safety Talking Point

TEAMWORK

  • A job well done is a great feeling.  Taking pride in the work you do and truly being your brother’s/sister’s keeper will produce safe and efficient results.  Thinking ahead, anticipating the unexpected, and doing the right thing when nobody is looking will create a safety culture where everyone goes home safely every day.  Make safety a habit – make it part of your routine from the start of your day to your tailgate and until the job is finished.

Executive Summary

  • No significant changes have been made to the forecast since this morning's issuance
  • Mostly dry, but remaining cool today and tomorrow
  • Increasing ridgetop and desert slope winds Saturday, peaking Sunday morning with gusts above 50 mph in the usual wind-prone areas
  • Rainfall will spread into the region Sunday morning with off and on showers possible into early Monday 
  • Dry Monday afternoon, but the next storm arrives Tuesday into Wednesday with additional rainfall and mountain winds

Forecast Discussion

Patchy cloud cover will be here to stay through the afternoon as the last remnants of yesterday's storm activity continue to fade.  By tomorrow, we'll begin the transition to our second in the line-up of storms with increasing winds across the mountains and high clouds filtering across the service territory through the afternoon.  However, the rain is expected to hold off until Sunday morning.  The first traces of precipitation may start as early as sunrise, but the rain will become a bit heavier between mid-morning and early afternoon as a cold front sweeps from northwest to southeast across our service territory.  Mountain winds will reach their peak strength on Sunday morning with gusts in excess of 50 mph across the usual wind-prone ridges and desert slopes, and, though we don't expect impactful coastal conditions, a noticeable breeze is likely west of the mountains through early afternoon.  A few showers may linger, especially across the mountains, into Sunday night.

Monday will feature some sunshine through the clouds, but the dry stretch will be short-lived as the next storm bears down upon us mid-week.  While the timing of the start of the rainfall is still being worked out by our forecast models, it's likely that we will be seeing soggy conditions arise at some point during the day Tuesday and linger through at least Wednesday morning.  Like our last storm and the one to come this weekend, this system will also feature windy conditions across our mountain ridges and desert slopes, but is currently not anticipated to have too much of an impact on coastal areas.  

Dry conditions are currently forecast to return for the latter half of Wednesday and continue into the start of Memorial Day Weekend.  However, at the risk of sounding like a broken record, more storm activity cannot be ruled out for the end of the month into the first few days of June.


Fire Discussion

The Fire Potential Index will remain Normal through the next seven days. Our abundant grass crop has seen significant curing below 3,000 ft., however, additional rainfall in the forecast could lead to a short-lived second green-up. Live fuel moistures are reaching their peak, with several species of chaparral in full bloom. Those live fuel moistures will begin a slow decline as we enter warmer, drier months, though it’s expected to be many weeks before the live fuels will be dry enough to carry fire. Continued rainfall and moisture from coastal flow will moderate the drying of the fuels, so our first Elevated FPI is still weeks away. 

Today's Fire Potential Index (FPI)

ME RA EA NE OC NC BC CM
Normal

4

Normal

4

Normal

6

Normal

6

Normal

7

Normal

7

Normal

7

Normal

7

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

7-Day FPI Outlook

  Fri
5/17
Sat
5/18
Sun
5/19
Mon
5/20
Tue
5/21
Wed
5/22
Thu
5/23
ME Normal

4

Normal

6

Normal

4

Normal

5

Normal

5

Normal

4

Normal

5

RA Normal

4

Normal

6

Normal

4

Normal

5

Normal

5

Normal

4

Normal

5

EA Normal

6

Normal

7

Normal

5

Normal

6

Normal

6

Normal

5

Normal

6

NE Normal

6

Normal

7

Normal

5

Normal

6

Normal

6

Normal

5

Normal

6

OC Normal

7

Normal

7

Normal

6

Normal

6

Normal

7

Normal

6

Normal

7

NC Normal

7

Normal

7

Normal

6

Normal

6

Normal

7

Normal

6

Normal

7

BC Normal

7

Normal

7

Normal

6

Normal

6

Normal

7

Normal

6

Normal

7

CM Normal

7

Normal

7

Normal

6

Normal

6

Normal

7

Normal

6

Normal

7

Forecast Weather Legend

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

Latest 7-Day Forecast

Fri
5/17
Sat
5/18
Sun
5/19
Mon
5/20
Tue
5/21
Wed
5/22
Thu
5/23
EXPECTED WEATHER CONDITIONS
Partly Cloudy
Partly Cloudy
Rainy
Partly Cloudy
Cloudy
Rainy
Partly Cloudy
BEACHES
57/68 56/69 58/67 56/66 56/67 57/68 56/70
MESAS
58/68 58/69 60/67 58/67 57/65 58/68 57/71
MIRAMAR
55/70 54/71 57/68 55/68 55/67 55/68 55/72
INLAND ORANGE COUNTY
49/68 49/70 53/65 50/67 50/65 52/66 51/71
INLAND VALLEY
56/68 55/71 58/65 56/66 55/64 56/67 56/69
FOOTHILLS
50/68 49/71 52/64 50/65 49/63 51/66 50/70
MOUNTAINS
40/51 40/59 44/47 39/49 41/49 46/51 41/57
DESERTS
53/80 57/85 58/74 52/77 57/76 59/79 56/85
BACKCOUNTRY WINDS
23 23 34 27 24 41 31
CHANCE OF PRECIPITATION
5% 0% 85% 20% 35% 55% 10%

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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