FPCN39 CWLW 151430
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 SUNDAY 15 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       9   11     550   12   100   13    1350  20
KAMLOOPS     KEL       9    7     500   0     68   11    1400  11
OKANAGAN     KEL       9    9     500   0     34   13    1100   5
CASTLEGAR    SPOK      9    5     650   5     28   11     800   8
CRANBROOK    SPOK      9    7     950   6     60   12    2200  10
REVELSTOKE   KEL       9    5     450   0      9    7     500   0

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

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   15   W   31
CRANBROOK             W    9   W   31

TODAY'S VENTING: FAIR TO GOOD

VENTING FOR MONDAY: 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.     10    5     950  12    100    8    2500  15
PR. GEORGE   P.G.     21    5     800  12     99    8    1500  20
SMITHERS     P.G.      9    2     500   2     20    6     700   7
WELLS GRAY   P.G.     48    5    1300  15    100    9    2600  20
FT NLSN      F.N.      9   -3     400   6      9    0     400   6
FT STJOHN    F.N.     10    3     700   6     20    5     900   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   22   W   31
SMITHERS              W   17   W   31

TODAY'S VENTING: GOOD IN THE SOUTH AND POOR IN THE NORTH.


VENTING FOR MONDAY: FAIR TO POOR




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     67   11     650  14     93   13    1150  14
FRASER VLY   QUIL     66   11     600  14     92   13    1100  14
SRN VRISL    QUIL     49   11     550   9     83   13    1000  12
CNTRL VRISL  QUIL      9    8      50   3     36   10     350   9
NRN VRISL    HRDY     28   10     500   4     45   12     950   5
TERRACE      ANT       9    5     200  12     84    7    1050  14
STEWART      ANT      18    7     250   4     18    7     250   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 SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   20   W   26   W   33
PORT HARDY   W   19   W   20   W   24
SANDSPIT     W   26   W   24   SW  26

TODAY'S VENTING: FAIR TO GOOD.

VENTING FOR MONDAY: FAIR.




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


END/MWSO