FPCN39 CWLW 291400
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 29 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      18   14     750   2    100   21    3200  11
KAMLOOPS     KEL      23   14     800   3    100   19    3350  11
OKANAGAN     KEL      14   11     700   2    100   20    3350  11
CASTLEGAR    SPOK     19   13     750   4     66   20    2450   4
CRANBROOK    SPOK     10   11     950  16    100   15    2250  16
REVELSTOKE   KEL      13   11     750   2    100   19    3450  11

*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    N   13   N   28   N   35
CRANBROOK             E   11   E   22

TODAY'S VENTING: BECOMING GOOD BY THE EARLY AFTERNOON.

VENTING FOR SUNDAY: 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.     50    9    1450   4    100   14    3950  14
PR. GEORGE   P.G.     54    8    1500  15    100   15    3700  15
SMITHERS     P.G.     54    8    1000   5     56   15    1600   5
WELLS GRAY   P.G.     50    4    1000   8    100   17    4000  14
FT NLSN      F.N.     95   13    1150  10    100   17    3400  15
FT STJOHN    F.N.     94   10    1200  11    100   16    3700  15

*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            VR   5   VR   5
SMITHERS              VR   5   VR   5

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     44   14     550   9     86   19    1700   8
FRASER VLY   QUIL     45   14     500   9     89   20    1800   8
SRN VRISL    QUIL      9   13     500   0     77   19    1600   7
CNTRL VRISL  QUIL      9   14     500   0     81   20    1750   7
NRN VRISL    HRDY     72   10     500  10    100   13    1200  12
TERRACE      ANT      35    7     650   7     99   13    3200   6
STEWART      ANT      19    8     250   4     66   13    1650   5

*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    NW  22   N   24   N   28
PORT HARDY   NW  24   N   19   N   33
SANDSPIT     SW  22   S   30   SW  31

TODAY'S VENTING: GOOD

VENTING FOR SUNDAY: GOOD


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


END/LM
$$$$^^