FNUS73 KDTX 121340
FWSDTX

SPOT FORECAST FOR PORT CRESCENT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
940 AM EDT TUE MAY 12 2009

IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

DISCUSSION...CHALLENGING FORECAST FOR THE BURN SITE FOR TODAY AS A
LAKE BREEZE MAY MOVE ONSHORE BY EARLY AFTERNOON...CAUSING A WIND SHIFT
AND AN INCREASE IN RELATIVE HUMIDITY. HIGH RESOLUTION MODELS DEPICT THE
LAKE BREEZE MOVING IN AROUND 1-2 PM...CAUSING WINDS TO SHIFT FROM LIGHT SOUTHWEST
TO NORTHEAST. THE HIGH TEMPERATURE AND MINIMUM RELATIVE HUMIDIY FOR THE DAY
WILL LIKELY OCCUR RIGHT BEFORE THE LAKE BREEZE ARRIVES...WITH TEMPERATURES
DROPPING AND HUMIDITY RECOVERING AFTER THAT TIME.

THERE IS SOME UNCERTAINTY ABOUT BOTH THE TIMING AND THE INLAND EXTENT OF THE
LAKE BREEZE. HIGH PRESSURE IS OVERHEAD THIS MORNING AND WILL GRADUALLY BUILD
TO THE EAST THIS AFTERNOON. THE LIGHT WINDS PROVIDED BY HIGH PRESSURE
OVERHEAD AND THE LARGE TEMPERATURE DIFFERENCE OVER THE LAND AND WATER...WILL
TEND TO SUPPORT LAKE BREEZES.

OTHERWISE MOISTURE WILL SURGE NORTH INTO THE REGION OVERNIGHT AND THROUGH THE
DAY ON WEDNESDAY. THIS WILL LEAD TO HIGHER RELATIVE HUMIIDITIES AND A CHANCE OF
THUNDERSTORMS ON WEDNESDAY.

PLEASE CALL WITH ANY QUESTIONS TODAY.

$$

.TODAY...

SKY/WEATHER.........BECOMING MOSTLY SUNNY (20-30 PERCENT).
MAX TEMPERATURE.....AROUND 58 BY 1 PM...THEN FALLING TO AROUND 51
                    BY LATE AFTERNOON.
MIN HUMIDITY........AROUND 34 PERCENT BY 1 PM...THEN RISING TO 55-60 PERCENT
                    BY LATE AFTERNOON.
WIND (20 FT)........LIGHT AND VARIABLE UNTIL 11 AM...BECOMING SOUTHWEST
                    3-6 MPH...POSSIBLY SHIFTING TO NORTHEAST AT 5 TO 8 MPH
                    AFTER 1 PM.
TRANSPORT WINDS.....SOUTH AROUND 5 MPH.
MIXING HEIGHT.......INCREASING TO 8000 FT AGL BY 1 PM...DECREASING TO 3000
                    FT AGL BY LATE AFTERNOON.
VENTILATION RATE....EXCELLENT (MAX...600).

.TONIGHT...

MIN TEMPERATURE.....39-44.
MAX HUMIDITY........80 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 5 TO 10 MPH.
VENTILATION RATE....POOR (MIN...100).

$$
FORECASTER...CLARK
REQUESTED BY...RNADY MCKENZIE
TYPE OF REQUEST...PRESCRIBED
.TAG 20090512.PORTC.01/DTX