FPCN39 CWLW 011411
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 PST MONDAY 1 MARCH 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      45    5     550  15     90    8    1050  22
KAMLOOPS     KEL      20    4     600   4     86    8    1900   8
OKANAGAN     KEL      11    3     550   1     86    8    1900   8
CASTLEGAR    SPOK     24    4     850   6     60    7    1150  12
CRANBROOK    SPOK      9    2     950   8     80    6    2550  16
REVELSTOKE   KEL      10    1     500   1     16    3     600   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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW   9   SW  20   W   35
CRANBROOK             W   15   W   37

TODAY'S VENTING: POOR THIS MORNING EXCEPT FAIR OVER THE FRASER CANYON
RISING TO GOOD EVERYWHERE THIS AFTERNOON. REVELSTOKE REMAINING POOR.

VENTING FOR TUESDAY: 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.     26    1    1550   7    100    5    3950  13
PR. GEORGE   P.G.     19    0     800   8     69    4    1600   9
SMITHERS     P.G.     10    0     650   1     46    4    1250   6
WELLS GRAY   P.G.     20   -3    1500   8    100    5    4000  13
FT NLSN      F.N.      9  -13     400   0      9  -18     400   0
FT STJOHN    F.N.     10   -4    1350   5     40   -2    1550  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            S   19   SW  24
SMITHERS              S   19   SW  24

TODAY'S VENTING: POOR THIS MORNING RISING TO FAIR TO GOOD THIS
AFTERNOON. EXCEPT REMAINING POOR AT FORT NELSON.

VENTING FOR TUESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     18    6     150  10     80    8     850  15
FRASER VLY   QUIL     17    6     150   8     40    7     250  12
SRN VRISL    QUIL     14    6     100   5     50    8     350  14
CNTRL VRISL  QUIL     14    6     100   5     80    9    1100  16
NRN VRISL    HRDY     38    5     500  12     90    7    1100  18
TERRACE      ANT      10    1     250   4     60    5    1100  10
STEWART      ANT       9   -2     200   3     25    5    1500  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 MONDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    W   41   W   48   W   43
PORT HARDY   W   37   W   41   SW  35
SANDSPIT     W   50   W   43   SW  28

TODAY'S VENTING: POOR THIS MORNING EXCEPT FAIR OVER NORTHERN
VANCOUVER ISLAND. VALUES RISING TO FAIR TO GOOD OVER MOST AREAS THIS
AFTERNOON. EXCEPT REMAINING POOR AT STEWART.

VENTING FOR TUESDAY: GOOD


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


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