FPCN39 CWLW 161402
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 TUESDAY 16 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       9    4     600   0     59    7    2500   5
KAMLOOPS     KEL      12    3     650   1    100    7    3300  11
OKANAGAN     KEL      12    3     650   1    100    7    3300  11
CASTLEGAR    SPOK     25    3     800   5    100    6    3300  11
CRANBROOK    SPOK     18    1     950   1     90    5    2850  11
REVELSTOKE   KEL       9    1     550   0     21    4    1100   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   15   W   19
CRANBROOK             W   15   W   33

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: 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.    100    0    2500  10    100    5    3650  10
PR. GEORGE   P.G.    100    0    1900   6    100    4    3300  10
SMITHERS     P.G.      9   -2     600   4    100    4    3000   8
WELLS GRAY   P.G.      9   -2     800   2    100    5    3200  10
FT NLSN      F.N.      9    0     500   0     90    6    2400   6
FT STJOHN    F.N.    100    0    1600  25    100    3    3200  10

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

FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   19   W   24
SMITHERS              SW  19   SW  24

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     35    6     900  15    100   10    3100   5
FRASER VLY   QUIL     25    6     850   5    100    9    3050   8
SRN VRISL    QUIL     15    7     500   5    100   11    3000   5
CNTRL VRISL  QUIL     15    5     500   5    100   10    3050   5
NRN VRISL    HRDY     14    4     500   4     89    7    1750   5
TERRACE      ANT       9    1     200   8     87    4    1850   8
STEWART      ANT       9    1     200   8     55    4     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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW   9   W   13   W   19
PORT HARDY   S   11   S   15   S   17
SANDSPIT     S   20   S   22   S   24

TODAY'S VENTING: GOOD

VENTING FOR WEDNESDAY: GOOD

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


END/WJW