FPCN39 CWLW 201400
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 20 JULY 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   23     700   0    100   31    3200   3
KAMLOOPS     KEL       9   21     700   0    100   30    3350   3
OKANAGAN     KEL       9   20     650   0    100   29    3350   3
CASTLEGAR    SPOK     19   19     850   3    100   29    3500   6
CRANBROOK    SPOK      9   18     950   0    100   26    3950   7
REVELSTOKE   KEL       9   18     550   0    100   26    3450   4

*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   SW  11   SW  13
CRANBROOK             VR   5   W   13

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.     10   17     950  15    100   24    3950  13
PR. GEORGE   P.G.     40   18    1000  12    100   22    3700  13
SMITHERS     P.G.     16   17     600   7     80   22    1500  11
WELLS GRAY   P.G.     15   17     950  12    100   24    4000  13
FT NLSN      F.N.     81   21    1150  15    100   27    3400  17
FT STJOHN    F.N.     77   18    1200  21    100   23    3700  19

*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   9   SW   9
SMITHERS              W    9   VR   9

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     11   17     550   1     16   21     600   1
FRASER VLY   QUIL     12   19     550   1     57   26    2000   3
SRN VRISL    QUIL     10   16     450   0     11   21     600   0
CNTRL VRISL  QUIL     11   19     550   0     29   25     950   2
NRN VRISL    HRDY     24   14     550   3     32   17     700   4
TERRACE      ANT      75   17    1550   7     83   22    2250   6
STEWART      ANT      62   17    1200   6     83   22    1950   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   S   13   SW  24
PORT HARDY   VR   5   VR   5   VR   5
SANDSPIT     NW  15   N   17   N   24

TODAY'S VENTING: FAIR TO POOR IN THE SOUTH. GOOD IN THE NORTH.


VENTING FOR WEDNESDAY: POOR


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

END/GF
$$$$^^