FNUS73 KDTX 131258
FWSDTX

SPOT FORECAST FOR PETERSBURG...MI DNR
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
858 AM EDT WED APR 13 2011

FORECAST IS BASED ON IGNITION TIME OF 1200 EDT ON APRIL 13.

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

.DISCUSSION...
HIGH PRESSURE WILL BRING LIGHTER WINDS ACROSS THE AREA TODAY...WITH
CONDITIONS REMAINING SEASONABLY WARM AND VERY DRY. MIN RH VALUES WILL
FALL TO 25 PERCENT OR LESS INLAND...AND NEAR TO 30 PERCENT OR HIGHER
CLOSER TO THE LAKESHORES. THE LAKE BREEZE SHOULD SHIFT WINDS ONSHORE
ALONG THE LAKE HURON AND LAKE ST CLAIR SHORELINES THIS
AFTERNOON...BUT IT APPEARS THERE SHOULD BE ENOUGH OF A NORTH-
NORTHWEST WIND COMPONENT NEAR LAKE ERIE TO EITHER PREVENT THE LAKE
BREEZE ENTIRELY...OR ALLOW WINDS TO BECOME VARIABLE AS THE PRESSURE
GRADIENT TRIES TO FIGHT THE LAKE BREEZE OFF. A COLD FRONT WILL DROP
ACROSS LOWER MICHIGAN TONIGHT AND THURSDAY. THIS WILL BRING HIGHER
RH...COOLER TEMPERATURES...AND AN INCREASE IN NORTH WIND.

.TODAY...

SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT).
MAX TEMPERATURE.....AROUND 61.
MIN HUMIDITY........25 PERCENT.
WIND (20 FT)........NORTH WINDS 5 TO 10 MPH.
TRANSPORT WINDS.....NORTH 7 TO 12 MPH.
MIXING HEIGHT.......1800 FT AGL...INCREASING TO 4700 FT AGL.
VENTILATION RATE....GOOD (MAX...400).

TIME (EDT)      12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM
SKY (%).........32  45  51  52  53  54  51  47
WEATHER COV.....
WEATHER TYPE....
TEMP............52  55  58  59  60  60  59  57
RH..............33  28  25  25  25  26  28  31
20 FT WIND DIR..N   N   N   N   N   N   N   N
20 FT WIND SPD..7   7   7   7   7   7   7   6
20 FT WIND GUST.10  15  15  15  15  15  10  10
MIX HGT (KFT)...2.7 3.7 4.5 4.7 4.7 4.7 4.7 4.7
VRATE (KT-FT)...300 400 400 400 400 400 400 400

$$
FORECASTER...CLARK/GURNEY
REQUESTED BY...LEE OSTERLAND
TYPE OF REQUEST...PRESCRIBED
.TAG 20110413.PETER.01/DTX