FPCN39 CWLW 051408
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 MARCH 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      55    5    2000  15     80    7    2300  10
KAMLOOPS     KEL      14    1     500   3     87    6    2050   8
OKANAGAN     KEL      15    2     550   3     87    6    2050   8
CASTLEGAR    SPOK     59    3    1000  13     86    6    1450  13
CRANBROOK    SPOK     20    0    1150   5    100    4    3950  10
REVELSTOKE   KEL      12    1     550   3     17    3     600   5

*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    VR   5   VR   5   VR   5
CRANBROOK             W   11   W   19

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

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.     15    0    1000   3     35    3    1500   5
PR. GEORGE   P.G.     17   -3     850   5     45    2    1500   5
SMITHERS     P.G.     16   -2     800   3     45    1    1450   5
WELLS GRAY   P.G.     17   -3    1000   3     30    3    1400   5
FT NLSN      F.N.     30  -14     650   8     42  -12     850   8
FT STJOHN    F.N.     51  -12    1350   8     64   -8    1650   8

*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            VR   5   SW  15
SMITHERS              SW  19   SW  15

TODAY'S VENTING: FAIR

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     78    6    1200   9    100   10    3100  10
FRASER VLY   QUIL     40    5     600   7    100    8    1900  11
SRN VRISL    QUIL     60    6     850   8    100    9    2050  10
CNTRL VRISL  QUIL     65    6     950   9    100   10    2600  10
NRN VRISL    HRDY     49    4     400  12     99    6    1750  10
TERRACE      ANT      10    1     250  14    100    3    1700  17
STEWART      ANT      10    0     250   2     60    3    1750   6

*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    VR   5   SW  11   S   24
PORT HARDY   S   15   S   19   S   20
SANDSPIT     S   39   S   41   SW  33

TODAY'S VENTING: GOOD

VENTING FOR SATURDAY: GOOD

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

END/WJW