700
FNUS75 KREV 140522
FWSREV

Spot Forecast for Big...BLM
National Weather Service Reno NV
1022 PM PDT Sun Jul 13 2025

Forecast is based on forecast start time of 0600 PDT on July 14.
If conditions become unrepresentative...contact the National
Weather Service in Reno.

...HEAT ADVISORY IN EFFECT UNTIL 11 AM PDT WEDNESDAY...

.DISCUSSION...

* Hot temperatures continue through Tuesday with terrain driven
  winds through the morning hours then southeasterly to west
  winds in the afternoon.

* Dry weather with poor overnight recoveries continues through
  Tuesday. However, storm chances have increased to 10-20% in
  the afternoon.

* Temperatures start a slight cool down to seasonal by Wednesday,
  at the same time enhanced afternoon winds return.


.MONDAY...

Sky/Weather.........Sunny then becoming mostly cloudy. Slight
                    chance of showers and thunderstorms late in the
                    afternoon.
Temperature.........58-62 at forecast start...Max 83-88.
RH..................30-33% at forecast start...Min 9-13%.
20-Foot Winds.......West winds 5-10 mph shifting to the southeast
late in the morning, then increasing to 9-14 mph
with gusts up to 20 mph early in the afternoon
decreasing to the west 5-9 mph late in the
                    afternoon. Gusty and erratic winds expected
                    near thunderstorms in the afternoon.
Chc Wetting Rain....5-10% in the afternoon.
Chance of thunder...10-20% in the afternoon.
Mixing Height.......200-500 ft agl then 11100-12100 ft agl in the
                    late morning and afternoon.
Transport Winds.....West 10-15 mph shifting to the south in the
                    late morning and afternoon.
Ventilation.........Poor to fair in the morning increasing to very
good to excellent in the afternoon.

TIME (PDT)      6 AM      9 AM      NOON      3 PM
Sky (%).........8         8         3         68
Weather cov.....                              S CHC
Weather type....NONE      NONE      NONE      RNSHWR
Tstm cov........                              S CHC
CWR.............0         0         10        10
Chc of thdr (%).0         0         10        20
Temp............60        71        80        83
RH..............31        21        16        13
20 FT wind......W 8G15    SE 9G15   SE 14G20  W 7G10
Eye level wind..W 5G9     SE 5G9    SE 8G12   W 4G6
Mx ht msl (kft).0.1       3.6       11        12
Transport wind..W 10      S 10      S 15      SW 10
Vrate kt-ft/1K..0         32        119       99
Ventrate Cat....POOR      FAIR      EXNT      VYGD

.MONDAY NIGHT...

Sky/Weather.........Mostly cloudy then becoming clear.
Temperature.........Min 56-61.
RH..................Max 32-37%.
20-Foot Winds.......West winds 9-14 mph with gusts to 20 mph becoming
southwest 5-10 mph with gusts to 15 mph
                    overnight. Gusty and erratic winds expected
                    near thunderstorms early in the evening.
Chc Wetting Rain....5-10% in the evening.
Chance of thunder...5-10% early in the evening.
Mixing Height.......7700-7900 ft agl early in the evening.
Transport Winds.....West 10-15 mph.
Ventilation.........Very good decreasing to poor late in the evening.

TIME (PDT)      5 PM      8 PM      11 PM     2 AM
Sky (%).........69        18        5         7
Weather cov.....S CHC
Weather type....RNSHWR    NONE      NONE      NONE
Tstm cov........S CHC
CWR.............10        10        0         0
Chc of thdr (%).10        0         0         0
Temp............85        70        63        60
RH..............15        29        35        30
20 FT wind......NW 14G20  W 12G15   W 10G15   SW 9G15
Eye level wind..NW 8G12   W 7G9     W 6G9     SW 5G9
Mx ht msl (kft).7.8       0.1       0.1       0.1
Transport wind..W 15      W 10      W 10      SW 10
Vrate kt-ft/1K..78        0         0         0
Ventrate Cat....VYGD      POOR      POOR      POOR

.TUESDAY...

Sky/Weather.........Sunny then becoming partly cloudy.
Temperature.........Max 78-83.
RH..................Min 10-14%.
20-Foot Winds.......Southwest winds 5-10 mph shifting to the north
                    in the late morning, then shifting to the
                    northwest late in the afternoon.
Chc Wetting Rain....0% increasing to 10% in the afternoon.
Chance of thunder...0% increasing to 10% in the afternoon.
Mixing Height.......200-500 ft agl then 11200-12200 ft agl in the
                    afternoon.
Transport Winds.....Southwest around 10 mph early in the morning
                    becoming light, then becoming southwest 10-15
                    mph in the afternoon.
Ventilation.........Poor to good in the morning increasing to
excellent in the afternoon.

TIME (PDT)      5 AM      8 AM      11 AM     2 PM
Sky (%).........4         4         18        38
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
CWR.............0         0         10        10
Chc of thdr (%).0         0         10        10
Temp............58        65        75        78
RH..............34        23        17        14
20 FT wind......SW 9G15   W 7G10    N 8G10    NW 10G15
Eye level wind..SW 5G9    W 4G6     N 5G6     NW 6G9
Mx ht msl (kft).0.1       0.1       6.8       13
Transport wind..SW 10     SW 5      SW 10     W 15
Vrate kt-ft/1K..0         0         61        154
Ventrate Cat....POOR      POOR      GOOD      EXNT

$$
Forecaster...Crespo
Requested by...NV-SFC
Type of request...WILDFIRE
.TAG 2517949.0/REV
.DELDT 07/14/25
.FormatterVersion 2.0.0
.EMAIL sbiddle@blm.gov