659
FNUS73 KAPX 300923
FWSAPX

Spot Forecast for Curtis Pines Savannah...USFS
National Weather Service Gaylord MI
523 AM EDT Thu May 30 2024

Forecast is based on ignition time of 1100 EDT on May 30.
If conditions become unrepresentative... contact the National Weather
Service.

Please contact our office at (989)732-9306, if you have questions
or concerns with this forecast.

.DISCUSSION...High pressure of Canadian will remain over the region today,
accompanied by a very dry airmass. Afternoon RH values will approach
critical levels, but winds will be light. A northerly wind direction
is favored initially, but winds will trend easterly this afternoon
as a lake breeze develops off Lake Huron. The lake breeze arrival will
also result in cooler temperatures and rising RH values.

.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
Max temperature.....Around 68.
Min humidity........27 percent.
20-foot winds.......Light winds becoming northeast around 5 mph in
                    the afternoon, then shifting to the east late
                    in the afternoon.
Transport winds.....North 8 to 13 mph.
Mixing height.......4100-6000 ft AGL.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.
Ventilation index...Good to excellent (357.0-714.0).

TIME (EDT)      11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........2   3   3   3   3   2   3
Weather cov.....
Weather type....
Tstm cov........
Temp............61  63  65  67  67  68  66
RH..............41  35  30  28  28  27  29
20 ft wind dir..N   NE  NE  NE  E   E   E
20 ft wind spd..5   6   6   6   6   6   6
20 ft wind gust.12  13  13  13  14  14  14
Mix hgt (kft)...4.1 5.6 5.7 5.8 6.0 5.3 4.4
Haines index....5   5   5   5   5   5   5
Transp wind dir.N   N   N   N   N   N   NE
Transp wind spd.13  13  10  8   8   8   8
Vrate kt-ft.....522 714 587 467 480 428 357
Ventrate Cat....GD  EXL GD  GD  GD  GD  GD

.TONIGHT...

Sky/weather.........Clear (0-10 percent).
Min temperature.....Around 40.
Max humidity........82 percent.
20-foot winds.......Southeast winds around 5 mph early in the
                    evening becoming light.
Transport winds.....Southeast 5 to 8 mph shifting to the southwest
                    5 to 9 mph overnight.
Mixing height.......2400-3400 ft AGL decreasing to 300-1000 ft AGL
                    early in the evening.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.
Ventilation index...Poor to fair (13.0-236.0).

TIME (EDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........4   4   2   3   2   2   3   3   3   2   1   2
Weather cov.....
Weather type....
Tstm cov........
Temp............65  63  58  54  51  49  47  47  44  43  42  41
RH..............30  31  39  48  56  58  65  63  70  76  79  82
20 ft wind dir..SE  SE  SE  S   S   S   SW  SW  SW  SW  SW  SW
20 ft wind spd..6   6   6   2   2   2   2   2   2   2   2   2
20 ft wind gust.12  12  12  7   7   7   5   5   5   6   6   6
Mix hgt (kft)...3.4 2.4 1.0 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Haines index....5   5   5   5   5   5   5   5   5   5   5   5
Transp wind dir.E   SE  SE  SE  S   S   S   S   S   SW  S   SW
Transp wind spd.7   7   8   6   6   5   6   5   6   8   9   9
Vrate kt-ft.....236 163 82  18  18  15  18  13  18  25  29  27
Ventrate Cat....FR  FR  PR  PR  PR  PR  PR  PR  PR  PR  PR  PR

.FRIDAY...

Sky/weather.........Sunny (5-15 percent).
Max temperature.....Around 77.
Min humidity........25 percent.
20-foot winds.......Light winds becoming southwest 5 to 6 mph late
                    in the morning.
Transport winds.....Southwest 9 to 13 mph.
Mixing height.......300-1700 ft AGL increasing to 5100-5400 ft AGL.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.
Ventilation index...Poor to good (29.0-483.0) increasing to good
                    (548.0) late in the afternoon.

TIME (EDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Sky (%).........2      3      9      12     14     15
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Temp............43     49     62     70     75     77
RH..............81     74     51     38     30     25
20 ft wind dir..SW     SW     SW     SW     SW     SW
20 ft wind spd..5      5      6      8      8      8
20 ft wind gust.8      8      12     14     14     14
Mix hgt (ft)....300    500    1700   4000   4800   5400
Haines index....5      5      5      5      5      5
Transport wind..SW 9   SW 10  SW 12  SW 12  SW 12  SW 13
Vrate kt-ft.....29     47     177    395    483    590
Ventrate Cat....POOR   POOR   FAIR   GOOD   GOOD   GOOD

$$
Forecaster...PBB
Requested by...Corey K. Smith
Type of request...PRESCRIBED
.TAG 2415300.1/APX
.DELDT 05/30/24
.FormatterVersion 2.0.0
.EMAIL corey.smith@usda.gov