FPCN39 CWLW 051429
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PST FRIDAY 5 FEBRUARY 1999 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      40    4     550  16     80    5     550  25
KAMLOOPS     KEL      35    2     500  12     65    4     700  20
OKANAGAN     KEL      12    2     500   2     60    6    1150  15
CASTLEGAR    SPOK      9    1     500   5     48    3     900  12
CRANBROOK    SPOK      9   -3     950   4     22    0    1000  12
REVELSTOKE   KEL      11    2     550   2     18    3     650   4

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    S   15   S   39   SW  94
CRANBROOK             SW  24   SW  69

TODAY'S VENTING: POOR RISING TO FAIR AT CASTELGAR AND GOOD OVER THE
OKANAGAN. EXCEPT FAIR OVER KAMLOOPS AND THE FRASER CANYON AREA THIS
MORNING RISING TO GOOD THIS AFTERNOON.

VENTING FOR SATURDAY: FAIR

CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.    100    0    1350  20    100    2    2450  30
PR. GEORGE   P.G.     10    0     700  15    100    2    1300  25
SMITHERS     P.G.     17   -1     600   9     21    0     650   9
WELLS GRAY   P.G.     30   -5    1200  20    100    2    2550  40
FT NLSN      F.N.      9  -21     400   1     30  -17     700  10
FT STJOHN    F.N.     25  -13    1000  12     63  -10    1100  19

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   83   S  122
SMITHERS              S   57   SW 122

TODAY'S VENTING: POOR RISING TO FAIR AT FORT ST JOHN AND GOOD AT
WELLS GRAY AND PRINCE GEORGE. REMAINING GOOD THROUGHOUT AT
WILLIAMS LAKE AND REMAINING POOR AT SMITHERS AND FORT NELSON.

VENTING FOR SATURDAY: FAIR

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL    100    7    1150  30    100    8    1400  40
FRASER VLY   QUIL     80    5     600  25    100    6     800  35
SRN VRISL    QUIL     85    7     950  30    100    9    1500  35
CNTRL VRISL  QUIL    100    6     700  30    100    8    1250  36
NRN VRISL    HRDY     70    5     700  20    100    7    1200  30
TERRACE      ANT       9   -1     200  12     20    0     200  20
STEWART      ANT      30   -3     200  15     50    0     200  25

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   78   S  102   SW 115
PORT HARDY   SW  54   SW  65   SW  67
SANDSPIT     W   52   W   44   SW  44

TODAY'S VENTING: GOOD MOST AREAS. EXCEPT POOR AT TERRACE AND POOR
RISING TO FAIR THIS AFTERNOON AT STEWART.

VENTING FOR SATURDAY: FAIR

VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.


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