FPCN39 CWLW 281400
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 WEDNESDAY 28 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   SPOK     51   24     750   9     91   30    3150   9
KAMLOOPS     SPOK     40   21     750   9     87   31    1600   9
OKANAGAN     SPOK      9   23     350   9     91   33    1950   9
CASTLEGAR    SPOK     29   22     750   9     74   30    2050   9
CRANBROOK    SPOK      9   21     950  12     95   31    3900  12
REVELSTOKE   SPOK      9   17     450   9     73   23    1170   9

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    SW  13   SW  30   W   54
CRANBROOK             W   19   W   48

TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: 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.    100   16    1800  24    100   17    2050  26
PR. GEORGE   P.G.     35   15     850  17     63   16    1100  17
SMITHERS     P.G.      9   13     500   5     17   15     500   5
WELLS GRAY   P.G.      9   14     320   3    100   17    2150  26
FT NLSN      F.N.      9   12     400   0     48   12     400   0
FT STJOHN    F.N.     54   16    1500   7     76   18    1950   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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   46   W   74
SMITHERS              SW  43   W   74

TODAY'S VENTING: GOOD EXCEPT POOR IN THE SMITHERS AREA.

VENTING FOR THURSDAY: FAIR


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     21   19     700   2     35   25    1000   3
FRASER VLY   QUIL     21   19     700   2     45   27    1250   4
SRN VRISL    QUIL      9   17     500   0     37   23     850   1
CNTRL VRISL  QUIL      9   20     750   0     29   26    1100   2
NRN VRISL    HRDY     11   14     350   1     33   17     550   1
TERRACE      ANT      78   14    1050  13     92   17    1550  11
STEWART      ANT      57   14     650  10     86   17    1200  11

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

FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  13   SW  30   SW  50
PORT HARDY   SW  24   SW  43   SW  57
SANDSPIT     W   24   W   39   W   56

TODAY'S VENTING: FAIR EXCEPT GOOD ALONG THE NORTH COAST.

VENTING FOR THURSDAY: FAIR

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

END/JEM
$$$$^^