FPCN39 CWLW 131400
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 13 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   20     200   6     73   30    2500  18
KAMLOOPS     KEL       9   20     350   5     88   29    3350   4
OKANAGAN     KEL       9   18     350   6     68   28    2200   4
CASTLEGAR    KEL       9   16     500   6     58   29    1100  10
CRANBROOK    KEL       9   18    1000   5    100   28    3950  15
REVELSTOKE   KEL       9   15     500   6     53   24    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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    W    9   W   17   W   20
CRANBROOK             W   13   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   13    1000   5    100   26    3950  22
PR. GEORGE   P.G.      9   13     700   5    100   23    3700  21
SMITHERS     P.G.      9   11     550   5    100   21    2350  16
WELLS GRAY   P.G.      9   12    1050   5    100   26    4000  22
FT NLSN      F.N.      9   14     400   5    100   20    1300  23
FT STJOHN    F.N.      9   15     700   5    100   23    3700  27

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE           NW   11   N   13
SMITHERS              N   24   N   13

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   15     100   5     94   20     750  22
FRASER VLY   QUIL      9   15      80   5    100   24     900  22
SRN VRISL    QUIL      9   15      50   5     69   21     800  11
CNTRL VRISL  QUIL     25   18      50  12     82   23     850  14
NRN VRISL    HRDY      9   14      50   5    100   15    1100  18
TERRACE      ANT       9   13     250   5     62   17    2650   3
STEWART      ANT       9   12      50   5     46   17    1850   2

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   24   W   31   W   41
PORT HARDY   NW  41   NW  46   NW  48
SANDSPIT     NW  41   N   44   N   57

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/mwso
$$$$^^