FPCN39 CWLW 101500 AAA
REVISED SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR
INCLUDING THE NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE
OF ENVIRONMENT CANADA AT 7.58 AM PDT THURSDAY 10 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   13     200   0    100   18    3200  10

KAMLOOPS     KEL       9   12     350   0    100   17    3350  10

OKANAGAN     KEL       9   12     350   0    100   17    3350  10

CASTLEGAR    SPOK     17   13     900   2    100   17    2200  14

CRANBROOK    SPOK      9   10     950  16    100   15    3950  14

REVELSTOKE   KEL       9   11     450   0    100   15    3450  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   W   17   W   26
CRANBROOK             SW  13   SW  35

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: 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.    100   10    3950  11    100   16    3950  11

PR. GEORGE   P.G.     32    9    1200   5    100   16    3700   9

SMITHERS     P.G.     25    9    1000   4    100   17    3500   8

WELLS GRAY   P.G.     45    5     1850  8    100   16    4000  11

FT NLSN      F.N.     22   14     550   7     75   20    1200  12

FT STJOHN    F.N.      9    9     700  15     65   17    1200  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NW   9   N   15
SMITHERS              W   15   NW  15

TODAY'S VENTING: GOOD

VENTING FOR FRIDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     49   14    1350   4     51   17    1450   4

FRASER VLY   QUIL     49   13    1350   4     51   17    1450   4

SRN VRISL    QUIL     43   13    1350   3     45   18    1450   3

CNTRL VRISL  QUIL     44   14    1350   3     45   18    1450   3

NRN VRISL    HRDY     63   12    1100   7     68   15    1300   6

TERRACE      ANT      83   12    1300  11     76   16    1550   8

STEWART      ANT      61   13    1250   5     63   16    1350   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   W    9   NW   9
PORT HARDY   VR   5   SE  13   E   15
SANDSPIT     VR   5   SE  17   E   17

TODAY'S VENTING: GOOD EXCEPT ONLY FAIR SOUTHERN VANCOUVER ISLAND.

VENTING FOR FRIDAY: GOOD

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

END/PJS
$$$$^^