FPCN39 CWLW 131436
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 13 MARCH 1998 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      16   10     650   2     37   15    1300   3
KAMLOOPS     KEL      19   10     900   2     35   14    1350   3
OKANAGAN     KEL      15    9     750   2     35   14    1350   3
CASTLEGAR    SPOK     18    8     800   3     22   12     950   3
CRANBROOK    SPOK      9    6     950   8     33   12    1250   8
REVELSTOKE   KEL       9    5     500   1     17    9     850   2

*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   SW  20   SW  37
CRANBROOK             VR   5   SW  24

TODAY'S VENTING: FAIR TO POOR

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.     52    7    1250  18     55    9    1650   7
PR. GEORGE   P.G.     19    5     850   7     41    8    1100   9
SMITHERS     P.G.      9    3     500   1     19    6     800   4
WELLS GRAY   P.G.      9    6    1000  18    100   10    2050  16
FT NLSN      F.N.     97   -5    1150  22    100    0    1300  23
FT STJOHN    F.N.     94    0    1350  23     96    2    1400  23

*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            W   31   SW  43
SMITHERS              SW  20   SW  43

TODAY'S VENTING: GOOD EXCEPT POOR IN THE NORTHWEST.

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL      9   11     100   6     19   14     250   6
FRASER VLY   QUIL      9   11      50   6     49   15     450  13
SRN VRISL    QUIL      9   11     150   0     39   13     500  10
CNTRL VRISL  QUIL      9   10      50   0     39   11     150  10
NRN VRISL    HRDY      9    9       0   2     42   12     450  10
TERRACE      ANT      10    4     250  14     10    5     250  14
STEWART      ANT       9    6       0   1      9    5       0   1

*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    SW  11   SW  26   SW  37
PORT HARDY   S   24   S   35   SW  48
SANDSPIT     S   39   S   41   S   37

TODAY'S VENTING: FAIR TO POOR

VENTING FOR SATURDAY: FAIR

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


END/