FPCN39 CWLW 141330
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 SATURDAY 14 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      13   11     600   1     27   14     700   4
KAMLOOPS     KEL       9    5     400   3     22   13     750   4
OKANAGAN     KEL      11    7     500   1     22   13     750   4
CASTLEGAR    SPOK     32    9     850   8     44   14     950   9
CRANBROOK    SPOK      9    6     950  15     40   12    1300  10
REVELSTOKE   KEL       9    4     450   1     10    6     500   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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  11   W   22
CRANBROOK             W    9   W   31

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR SUNDAY: 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.     21    5    1050  12     54    9    1600   7
PR. GEORGE   P.G.     19    4     850   7     25    7     950   7
SMITHERS     P.G.     16    4     750   3     27    7     900   5
WELLS GRAY   P.G.     10    5    1000  12     54    7    1700   7
FT NLSN      F.N.     15  -10     500   5     54   -3     800  10
FT STJOHN    F.N.     15   -3     780   5     67    4    1500  15

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            SW  28   W   33
SMITHERS              SW  31   SW  33

TODAY'S VENTING: POOR TO FAIR EXCEPT GOOD THIS AFTERNOON IN THE BC
PEACE.

VENTING FOR SUNDAY: FAIR TO GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     45   11     800   7     50   13     850   8
FRASER VLY   QUIL     42   10     650   7     50   13     850   8
SRN VRISL    QUIL     15    9     300   2     50   13     850   6
CNTRL VRISL  QUIL     20    9     300   4     50   12     800   6
NRN VRISL    HRDY      9    9       0   2     30   11     500   5
TERRACE      ANT      11    5     250  31     11    6     250  31
STEWART      ANT       9    7       0  13      9    6       0  13

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

FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    S   15   S   22   SW  31
PORT HARDY   S   39   SW  37   SW  33
SANDSPIT     SW  28   SW  33   SW  44

TODAY'S VENTING: POOR TO FAIR.

VENTING FOR SUNDAY: GOOD.




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


END/JDG