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 THURSDAY 17 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      12   21     250   6     86   27    1050  11
KAMLOOPS     KEL      46   22     600   9     87   26    1500  10
OKANAGAN     KEL      57   21     800  10     86   27    1650  11
CASTLEGAR    SPOK     41   19     900   9     90   27    2200   8
CRANBROOK    SPOK     20   20    1100   7    100   27    3950   9
REVELSTOKE   KEL      19   18     450   5     80   26    1700  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   SW  11   SW  13
CRANBROOK             VR   5   W   13

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.     81   17    1950  11    100   25    3950   8
PR. GEORGE   P.G.     50   17    1050  14    100   23    3700  10
SMITHERS     P.G.     12   14     700   2     67   20    1450   9
WELLS GRAY   P.G.     11   19     960   8    100   25    4000   8
FT NLSN      F.N.      9   15     400   4     89   25    1550   4
FT STJOHN    F.N.     19   19     750  15    100   24    2400  13

*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            VR   5   S   17
SMITHERS              S    9   S   17

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     17   17     200   5     70   21    1550   8
FRASER VLY   QUIL     16   16     350   5     84   22    1650   8
SRN VRISL    QUIL     21   16     300   5     65   21    1450   5
CNTRL VRISL  QUIL     17   16     350   5     78   22    1600   7
NRN VRISL    HRDY     29   13     350   7     56   16     850   7
TERRACE      ANT     100   15    1650  26    100   19    2200  26
STEWART      ANT      98   14     900  18    100   19    1950  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S   17   S   24
PORT HARDY   S   17   S   30   S   37
SANDSPIT     S   30   S   37   S   41

TODAY'S VENTING: GOOD.

VENTING FOR FRIDAY:  GOOD.

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

END/JEM
$$$$^^