FPCN39 CWLW 031400
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 3 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      25   18     850   2    100   26    2700   8
KAMLOOPS     KEL      25   17     950   3    100   26    3350   9
OKANAGAN     KEL      16   14     700   2    100   24    2650   8
CASTLEGAR    SPOK     63   15    1350   9     98   22    2400   9
CRANBROOK    SPOK     57   14    1550  10     93   18    2500   9
REVELSTOKE   KEL      18   15     850   2    100   23    2650   8

*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    NW  13   NW  24   NW  33
CRANBROOK             VR   5   NW  24

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.     62   14    1800   8    100   20    3950  15
PR. GEORGE   P.G.     50   14    1300   8    100   19    3700  16
SMITHERS     P.G.     10   12     700   1     57   16    1750   5
WELLS GRAY   P.G.     62   14    1800   8    100   20    4000  15
FT NLSN      F.N.     10   14     450   2     93   18    2150   9
FT STJOHN    F.N.    100   16    2900  13    100   20    3700  14

*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            W   35   W   44
SMITHERS              W   37   W   44

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     48   13     750   7     80   18    1000  12
FRASER VLY   QUIL     15   13     750   7    100   20    1300  13
SRN VRISL    QUIL     42   14     800   5     73   18     950  10
CNTRL VRISL  QUIL     56   15     800   8     97   21    1450  11
NRN VRISL    HRDY     28   11     500   4     52   15    1050   5
TERRACE      ANT     100   12    1300  18    100   15    1650  18
STEWART      ANT      97   12    1000  16    100   15    1350  16

*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    W   22   NW  31   NW  33
PORT HARDY   NW  15   NW  31   W   44
SANDSPIT     W   20   W   41   W   57

TODAY'S VENTING: GOOD EXCEPT FAIR NORTHERN 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/RET
$$$$^^