FPCN39 CWLW 171400
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 MONDAY 17 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      16    5     450   5     90   14    2400  10
KAMLOOPS     KEL      13    7     600   2    100   16    2500   6
OKANAGAN     KEL       9    4     500   0     85   14    2550   7
CASTLEGAR    SPOK     28    8    1050   8     88   13    3200   9
CRANBROOK    SPOK     10    9     950  14    100   13    3950  14
REVELSTOKE   KEL       9    5     550   0     89   13    2350   9

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  19   SW  48
CRANBROOK             SW  13   SW  37

TODAY'S VENTING: GOOD THIS AFTERNOON

VENTING FOR TUESDAY: 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.      9    4     950   8    100   13    3750   8
PR. GEORGE   P.G.      9    7     700   8    100   13    2850   8
SMITHERS     P.G.      9    7     500   6    100   12    2600   1
WELLS GRAY   P.G.     63    5    2400   5     90   13    3500   8
FT NLSN      F.N.      9    5     400   4     80   11    3400   4
FT STJOHN    F.N.     31    4    1000   8     85   12    3600   9

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

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  11   SW  11
SMITHERS              VR   5   VR  11

TODAY'S VENTING: GOOD THIS AFTERNOON

VENTING FOR TUESDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     30   10     550  18     90   12    1350  17
FRASER VLY   QUIL     30    9     500  18     90   12    1400  17
SRN VRISL    QUIL     30   10     650   3     90   13    1400  14
CNTRL VRISL  QUIL     30    9     550   3     85   15    1300  13
NRN VRISL    HRDY     11    8     350   1     75   13    1800   7
TERRACE      ANT      50   10    1200   5     87   15    2600   6
STEWART      ANT      31   10     600   4     85   15    2000   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SE  15   S   28   SW  44
PORT HARDY   NW  22   N   17   NE  20
SANDSPIT     NW  22   NW  20   NW  15

TODAY'S VENTING: GOOD THIS AFTERNOON.

VENTING FOR TUESDAY: FAIR TO GOOD.


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

END/JEM
$$$$^^