FPCN39 CWLW 221400
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 PDT SATURDAY 22 MAY 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      74   17    1400   8    100   26    2600  15
KAMLOOPS     KEL      50   15    1300   4     65   24    2550   5
OKANAGAN     KEL      49   12     850  10     65   23    2550   5
CASTLEGAR    SPOK     34   14     900   7     65   24    2500   5
CRANBROOK    SPOK     42   13    1350   9    100   22    3950   8
REVELSTOKE   KEL      53   13    1100   8    100   23    3450   7

*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   NW   9   NW  15
CRANBROOK             VR   5   NW  19

TODAY'S VENTING: BECOMING GOOD THIS AFTERNOON.

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.     65    9    1600  15     70   17    2150  10
PR. GEORGE   P.G.     65   11    1600  15     70   16    2100  10
SMITHERS     P.G.     11    9     700   1     70   14    1700  14
WELLS GRAY   P.G.     70    8    1700  15    100   17    4000  26
FT NLSN      F.N.     22   10     650   6    100   17    3400  17
FT STJOHN    F.N.    100   13    2750  20    100   17    3700  20

*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   50
SMITHERS              SW  41   W   50

TODAY'S VENTING: BECOMING GOOD BY THIS AFTERNOON.

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     36   13     550   7     50   18    1100   6
FRASER VLY   QUIL     41   14     600   7     50   22    1150   6
SRN VRISL    QUIL     30   12     400   6     50   18    1150   6
CNTRL VRISL  QUIL     37   14     600   6     50   21    1100   6
NRN VRISL    HRDY     22   12     350   4     47   15     900   5
TERRACE      ANT      40    9     550  12     50   14    1100  10
STEWART      ANT      40    9     550  12     50   14    1100  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 SATURDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   N   13   NW  26
PORT HARDY   S   15   SW  22   W   33
SANDSPIT     S   67   SW  67   SW  85

TODAY'S VENTING: FAIR.

VENTING FOR SUNDAY: FAIR.




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


END/JDG
$$$$^^