FPCN39 CWLW 271334
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 27 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      24    6     500   5    100   10    3200  18
KAMLOOPS     KEL      20    5     550   5    100    9    3350  18
OKANAGAN     KEL      16    4     500   5    100    9    3350  18
CASTLEGAR    SPOK     96    4    1200  22    100    8    2400  27
CRANBROOK    SPOK    100    2    1650  30    100    6    3950  29
REVELSTOKE   KEL      11    3     500   5    100    7    3450  18

*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   W   13   W   19
CRANBROOK             W    9   W   20

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.     91    0    2100  12    100    5    3950  12
PR. GEORGE   P.G.     10    0     700  11    100    5    3700  12
SMITHERS     P.G.     12    0     650   2    100    5    3500  10
WELLS GRAY   P.G.    100    0    4000  12    100    6    4000  12
FT NLSN      F.N.      9    1     400  20    100    5    3500  25
FT STJOHN    F.N.     11    1     700  29    100    5    3700  21

*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   19   W   24
SMITHERS              W   15   W   24


TODAY'S VENTING: GOOD.

VENTING FOR SATURDAY: GOOD.




COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     70    6     900  11    100    9    3000  14
FRASER VLY   QUIL    100    7    1550  13    100   10    3000  14
SRN VRISL    QUIL     89    7    1250  11    100   11    3000  15
CNTRL VRISL  QUIL     29    5     300   8    100    9    3450  13
NRN VRISL    HRDY     24    3     300   6    100    6    3250   9
TERRACE      ANT      45    2     900   6    100    5    3000   7
STEWART      ANT      31    3     500   5    100    5    3200   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    SW   9   SW  11   SW  15
PORT HARDY   W   17   W   20   W   22
SANDSPIT     NW  19   NW  19   NW  19


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/JDG