FNUS73 KFGF 211326
FWSFGF

SPOT FORECAST FOR PRAIRIE SMOKE DUNES SNA...MN DNR
NATIONAL WEATHER SERVICE GRAND FORKS ND
826 AM CDT FRI MAY 21 2010

FORECAST IS BASED ON IGNITION TIME OF 1200 CDT ON MAY 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
WARM AND PARTLY SUNNY WEATHER IS EXPECTED TODAY. A WEAK PRESSURE
GRADIENT DUE TO UPPER MIDWEST HIGH PRESSURE IS A CAUSE FOR
CONCERN. THE WINDS WILL BE VERY LIGHT AND VARIABLE THIS
MORNING...BUT COULD IMPROVE A BIT BY BURN TIME. WHILE A LIGHT
SOUTHEASTERLY WIND IS THE BEST BET NEAR BURN TIME...CANNOT RULE
OUT SOME VARIABILITY IF THE WINDS REMAIN TOO LIGHT. THE SPEED
SHOULD IMPROVE AND THE DIRECTION BECOME MORE RELIABLE BY 2 PM AS
THE MIXING INCREASES. THE GOOD MIXING HEIGHTS WILL HELP DRAW DOWN
DRY AIR FROM ALOFT...SO THE MINIMUM RH SHOULD GET DOWN TO NEAR 30
PERCENT.

.TODAY...

SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....76-81.
MIN HUMIDITY........27-32 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 8 MPH EARLY IN
                    THE MORNING.
MIXING HEIGHT.......300 FT AGL INCREASING TO 9300-10100 FT AGL.
MIXING WINDS........SOUTH 6 TO 9 MPH.

TIME (CDT)      11A 12P 1PM 2PM 3PM 4PM 5PM 6PM
SKY (%).........43  43  43  43  43  42  43  43
WEATHER COV.....
WEATHER TYPE....
TEMP............69  71  74  76  77  78  78  78
RH..............51  42  37  36  34  33  32  33
20 FT WIND DIR..S   S   S   S   S   S   S   S
20 FT WIND SPD..5   5   5   5   6   6   6   7
20 FT WIND GUST.10  10  10  10  10  10  10  10

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY BECOMING MOSTLY CLOUDY.
MIN TEMPERATURE.....52-57.
MAX HUMIDITY........78-83 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 5 TO 10 MPH.
MIXING HEIGHT.......8900 FT AGL DECREASING TO 300 FT AGL.
MIXING WINDS........SOUTH 9 TO 17 MPH INCREASING TO 25 TO 33 MPH
                    LATE IN THE EVENING...THEN BECOMING SOUTHEAST
                    10 TO 18 MPH AFTER MIDNIGHT.

TIME (CDT)      7 PM   9 PM   11 PM  1 AM   3 AM   5 AM
SKY (%).........44     48     52     57     60     63
WEATHER COV.....
WEATHER TYPE....NONE   NONE   NONE   NONE   NONE   NONE
TEMP............77     72     65     61     57     55
RH..............35     39     54     64     70     77
20 FT WIND......S 7    SE 7   SE 7   SE 7   SE 7   SE 8
20 FT WIND GUST.10     10     10     10     10     15

.SATURDAY...

SKY/WEATHER.........PARTLY SUNNY. CHANCE OF SHOWERS AND
                    THUNDERSTORMS.
MAX TEMPERATURE.....78-83.
MIN HUMIDITY........45-50 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 16 TO 21 MPH WITH GUSTS TO
                    AROUND 30 MPH. GUSTY AND ERRATIC WINDS EXPECTED
                    NEAR THUNDERSTORMS.
MIXING HEIGHT.......300 FT AGL INCREASING TO 5200-6000 FT AGL.
MIXING WINDS........SOUTHEAST 13 TO 20 MPH INCREASING TO SOUTH 36
                    TO 44 MPH.

TIME (CDT)      7 AM      10 AM     1 PM      4 PM
SKY (%).........64        64        63        61
WEATHER COV.....CHANCE    CHANCE    CHANCE    CHANCE
WEATHER TYPE....TSTORM    TSTORM    TSTORM    TSTORM
TEMP............54        66        77        81
RH..............83        66        51        49
20 FT WIND......SE 10G15  SE 15G25  SE 19G30  SE 18G30

$$
FORECASTER...EWENS
REQUESTED BY...ERIK ANTHONISEN
TYPE OF REQUEST...PRESCRIBED
.TAG 20100521.PRAIR.01/FGF