FPCN39 CWLW 021340
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 2 JULY 1998 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      13   18     550   1    100   32    3200   12
KAMLOOPS     KEL      11   21     550   1    100   30    3350   9
OKANAGAN     KEL      11   20     550   1    100   30    3350   9
CASTLEGAR    SPOK     22   22     800   4    100   29    3500   7
CRANBROOK    SPOK      9   18     950   3    100   27    3950   6
REVELSTOKE   KEL      10   19     550   1     86   27    1800   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   VR   5   VR   5
CRANBROOK             VR   5   E    9

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1700 m         28 C
SPOKANE          900 m         26 C

TODAY'S VENTING: GOOD
VENTING FOR FRIDAY: GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY: GENERALLY 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   17     950   7    100   22    3950   7
PR. GEORGE   P.G.     19   17     900   5     85   23    2400   6
SMITHERS     P.G.     15   18     850   2     78   22    2400   4
WELLS GRAY   P.G.     54   18    1800   7    100   24    4000   7
FT NLSN      F.N.      9   16     400  13     87   24    1600  11
FT STJOHN    F.N.      9   16     700  13     85   22    1900  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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            E   17   E   19
SMITHERS              NE  17   E   19

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1300 m         21 C
FT. NELSON       800 m         21 C

TODAY'S VENTING: GOOD
VENTING FOR FRIDAY: GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY: GENERALLY GOOD


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     33   18     750   4     51   24    1350   4
FRASER VLY   QUIL     33   18     700   4     53   26    1500   4
SRN VRISL    QUIL      9   16     650   0     29   22     950   5
CNTRL VRISL  QUIL      9   19     750   0     49   28    1650   5
NRN VRISL    HRDY     17   14     300   3     53   17     800   5
TERRACE      ANT      36   19     450  12     84   24    1350  11
STEWART      ANT      22   18     250   6     64   24     800   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 THURSDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    VR   5   VR   5   VR   5
PORT HARDY   NW  24   NW  22   NW  19
SANDSPIT     N   33   N   28   N   28

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       600 m         28 C
PORT HARDY       750 m         26 C
ANNETTE          300 m         25 C

TODAY'S VENTING: FAIR SOUTH COAST AND GOOD NORTH COAST
VENTING FOR FRIDAY: FAIR
VENTING OUTLOOK SATURDAY THRU MONDAY: GENERALLY FAIR


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


END/MWSO/TAL