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 TUESDAY 29 JUNE 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   15     190  20    100   20    2150  11
KAMLOOPS     KEL       9   13     350   5    100   20    2250  11
OKANAGAN     KEL       9   12     350   5    100   20    2250  11
CASTLEGAR    SPOK      9   14     500   7     64   18    1450  12
CRANBROOK    SPOK      9   11     940   5     93   18    2150  12
REVELSTOKE   KEL       9   12     450   5     64   16    1450   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   W   26
CRANBROOK             W   11   W   22

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.      9   10    1000   5    100   16    3950  16
PR. GEORGE   P.G.      9   11     700   6    100   15    2300  12
SMITHERS     P.G.      9    9     550   6     60   14    1400  12
WELLS GRAY   P.G.      9    9    1000   5    100   16    4000  16
FT NLSN      F.N.      9   11     400   8    100   21    1950  12
FT STJOHN    F.N.      9   13     700  12     93   18    1950  12

*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            SW  19   W   33
SMITHERS              SW  24   SW  33

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      9   13     100   6     83   17    1150  11
FRASER VLY   QUIL      9   13      80   5     82   17    1100  11
SRN VRISL    QUIL      9   12      40   5     73   17    1050   9
CNTRL VRISL  QUIL      9   13      50   7     82   18    1250   9
NRN VRISL    HRDY      9   12      40   5     74   15     800  12
TERRACE      ANT       9    9     240  10    100   15    2300  24
STEWART      ANT       9   10      20   9    100   15    1800  23

*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  17   SW  22   W   31
PORT HARDY   S   26   SW  26   W   35
SANDSPIT     SW  22   SW  31   SW  43

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/ret
$$$$^^