Spot Forecast
Issued by NWS San Diego, CA

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Spot Forecast for Grass Valley...Forest Service
National Weather Service San Diego CA
506 AM PDT Tue Apr 23 2024

Forecast is based on ignition time of 0900 PDT on April 24.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...
A robust marine layer will deepen and approach or reach Crestline
and Twin Peaks area. It will continue generally cool with high
humidity. Light showers are possible within the marine layer downhill,
but not on the ridge. The incident site should have occasional fog.
Wetting rains are not anticipated. Breezy onshore winds will be
strongest late Wednesday and again Friday afternoon and Friday night.

.WEDNESDAY...

Sky/weather.........Partly cloudy (35-45 percent) then becoming
                    mostly sunny (5-15 percent) then becoming
                    partly cloudy (40-50 percent).
Max temperature.....Around 54.
Min humidity........53 percent.
Eye level winds.....South winds 7 to 11 mph. Gusts up to 13 mph
                    increasing to 18 mph late in the afternoon.
Wind (20 ft)........
 Slope/valley.......South winds 10 to 15 mph. Gusts up to 18 mph
                    increasing to 25 mph late in the afternoon.
 Ridgetop...........South 15 to 20 mph.
CWR.................2 percent.
Mixing height.......2200 ft AGL.
Transport winds.....South 15 to 24 mph.

TIME (PDT)      9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........38  38  7   7   7   14  14  14  43
Weather cov.....
Weather type....
Tstm cov........
Temp............47  49  50  51  53  54  54  52  49
RH..............57  54  53  54  56  59  61  64  67
20 FT wind dir..S   S   S   S   S   S   S   S   S
20 FT wind spd..10  12  12  13  13  14  15  15  15
20 FT wind gust.18  18  18  20  21  22  22  23  25
Eye lvl wnd dir.S   S   S   S   S   S   S   S   S
Eye lvl wnd spd.7   8   8   9   9   10  11  11  11
Eye lvl wnd gst.13  13  13  14  15  16  16  17  18
Ridge wind dir..S   S   S   S   S   S   S   S   SW
Ridge wind spd..15  15  15  20  20  20  20  20  20
CWR.............0   0   0   0   0   0   0   0   0

.WEDNESDAY NIGHT...

Sky/weather.........Partly cloudy (50-60 percent).
Min temperature.....Around 39.
Max humidity........94 percent.
Eye level winds.....South winds 9 to 11 mph with gusts to around 16
                    mph.
Wind (20 ft)........
 Slope/valley.......South winds 13 to 15 mph with gusts to around
                    23 mph.
 Ridgetop...........South 15 to 20 mph.
CWR.................6 percent.
Mixing height.......700 ft AGL.
Transport winds.....South 18 to 24 mph.

TIME (PDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........43  43  43  43  43  63  63  63  63  63  63  60
Weather cov.....
Weather type....
Tstm cov........
Temp............47  45  43  42  41  41  40  40  40  40  40  40
RH..............72  78  83  88  91  94  94  93  91  90  90  94
20 FT wind dir..S   S   S   S   S   S   S   S   S   S   S   S
20 FT wind spd..15  15  15  14  14  13  14  14  15  15  15  14
20 FT wind gust.25  23  22  22  21  21  21  22  22  22  22  22
Eye lvl wnd dir.S   S   S   S   S   S   S   S   S   S   S   S
Eye lvl wnd spd.11  11  11  10  10  9   10  10  11  11  11  11
Eye lvl wnd gst.18  17  16  16  15  15  15  16  16  16  16  16
Ridge wind dir..S   S   S   S   S   S   S   S   S   S   S   S
Ridge wind spd..20  20  20  20  20  15  20  20  20  20  20  20
CWR.............0   0   0   0   0   10  10  10  10  10  10  10

.THURSDAY...

Sky/weather.........Partly cloudy (50-60 percent).
Max temperature.....Around 48.
Min humidity........79 percent.
Eye level winds.....South winds 8 to 11 mph with gusts to around 16
                    mph.
Wind (20 ft)........
 Slope/valley.......South winds 11 to 14 mph with gusts to around
                    22 mph.
 Ridgetop...........South 15 to 20 mph increasing to around 25 mph
                    late in the afternoon.
CWR.................6 percent.
Mixing height.......2100 ft AGL.
Transport winds.....South 15 to 21 mph.

TIME (PDT)      9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........60  60  46  46  46  46  46  46  53
Weather cov.....
Weather type....
Tstm cov........
Temp............41  42  43  44  46  46  47  46  46
RH..............87  85  83  82  80  79  79  81  83
20 FT wind dir..S   S   S   S   S   S   S   S   S
20 FT wind spd..12  12  12  12  13  13  14  14  14
20 FT wind gust.18  18  18  20  20  20  21  22  22
Eye lvl wnd dir.S   S   S   S   S   S   S   S   S
Eye lvl wnd spd.9   8   9   9   9   9   10  10  11
Eye lvl wnd gst.13  13  13  14  14  15  15  16  16
Ridge wind dir..S   S   S   S   S   S   S   S   S
Ridge wind spd..15  15  15  15  20  20  20  20  25
CWR.............10  10  0   0   0   0   0   0   0

.THURSDAY NIGHT...

Sky/weather.........Partly cloudy (50-60 percent) then becoming
                    mostly cloudy (75-85 percent).
Min temperature.....Around 41.
Max humidity........92 percent.
Eye level winds.....South winds 5 to 11 mph. Gusts up to 15 mph.
Wind (20 ft)........
 Slope/valley.......South winds 8 to 14 mph. Gusts up to 21 mph.
 Ridgetop...........South 15 to 20 mph decreasing to 5 to 10 mph
                    overnight.
CWR.................5 percent.
Mixing height.......700 ft AGL.
Transport winds.....South 12 to 21 mph decreasing to 7 to 10 mph
                    overnight.

TIME (PDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........53  53  53  53  53  86  86  86  86  86  86  74
Weather cov.....
Weather type....
Tstm cov........
Temp............45  43  42  42  41  41  41  41  41  41  40  41
RH..............85  88  90  91  92  91  92  91  91  91  90  88
20 FT wind dir..S   S   S   S   S   S   S   S   S   S   S   S
20 FT wind spd..14  14  12  12  12  9   9   9   8   8   8   8
20 FT wind gust.22  21  20  20  18  16  15  15  14  14  13  13
Eye lvl wnd dir.S   S   S   S   S   S   S   S   S   S   S   S
Eye lvl wnd spd.11  10  9   9   8   7   6   6   6   6   6   5
Eye lvl wnd gst.16  15  15  14  13  12  11  11  10  10  9   9
Ridge wind dir..S   S   S   S   S   S   S   S   S   S   S   S
Ridge wind spd..20  20  20  15  15  15  10  10  10  10  5   5
CWR.............0   0   0   0   0   10  10  10  10  10  10  M

.FRIDAY...

Sky/weather.........Mostly cloudy (70-80 percent) then becoming
                    partly cloudy (45-55 percent).
Max temperature.....Around 53.
Min humidity........65 percent.
Eye level winds.....Southwest winds 5 to 9 mph. Gusts up to 14 mph
                    late in the afternoon.
Wind (20 ft)........
 Slope/valley.......Southwest winds 8 to 13 mph. Gusts up to 20 mph
                    late in the afternoon.
 Ridgetop...........Southwest 5 to 10 mph increasing to 15 to 20
                    mph late in the morning.
CWR.................8.
Mixing height.......3900 ft AGL.
Transport winds.....Southwest 7 to 16 mph increasing to 18 to 20
                    mph late in the afternoon.

TIME (PDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........74  74  74  74  74  48  48  48  48  48  48  55
Weather cov.....
Weather type....
Tstm cov........
Temp............41  41  42  44  46  48  50  51  52  51  50  49
RH..............86  83  79  76  72  69  67  66  65  66  68  71
20 FT wind dir..S   S   SW  SW  SW  S   S   S   SW  SW  SW  SW
20 FT wind spd..8   8   8   8   8   9   9   9   12  12  12  13
20 FT wind gust.13  13  14  14  14  15  15  15  18  18  18  20
Eye lvl wnd dir.S   S   SW  SW  SW  S   S   S   SW  SW  SW  SW
Eye lvl wnd spd.5   5   6   6   6   7   7   7   8   8   8   9
Eye lvl wnd gst.9   9   10  10  10  11  11  11  13  13  13  15
Ridge wind dir..S   SW  SW  SW  S   S   S   SW  SW  SW  SW  SW
Ridge wind spd..5   5   5   10  10  15  15  15  20  20  20  20
CWR.............M   M   M   M   M   M   M   M   M   M   M   M

$$
Forecaster...MIGUEL MILLER
Requested by...Brian Grant
Type of request...PRESCRIBED
.TAG 2411532.0/SGX
.DELDT 04/23/24
.FormatterVersion 2.0.0
.EMAIL brian.grant3@usda.gov
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