AIR QUALITY WEATHER SUMMARY
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
931 AM EDT FRI JUL 03 2009
 

***The following information provided is general weather forecast
information as it relates to expected areas of degraded air
quality, but is not intended to supersede site-specific forecasts
or local alerts and advisories. This especially applies to the
proximity of wildfires where localized weather conditions are
often extreme and very erratic.***


...NORTHEAST...

LOW PRESSURE OVER QUEBEC WILL PROGRESS EASTWARD DURING THE DAY
SATURDAY AND BRING A TRAILING SURFACE TROUGH THROUGH NEW ENGLAND. 
NORTHERN AREAS SHOULD SEE MOSTLY CLOUDY SKIES AND SCATTERED
SHOWERS AND THUNDERSTORMS... WHILE SOUTHERN AREAS CAN ANTICIPATE
PARTLY CLOUDY SKIES AND AT MOST AN ISOLATED SHOWER.  EXPECT HIGHS
IN THE 60S AT HIGHER ELEVATIONS AND OVER NORTHWESTERN NEW ENGLAND
WITH 70S TO LOW 80S ELSEWHERE.  BY AFTERNOON WINDS SHOULD BE FROM
THE WEST... AT 5 TO 15 MPH OVER NORTHERN NEW ENGLAND AND 10 TO 20
MPH ELSEWHERE.  VENTILATION INDICES ARE FORECAST TO BE IN THE
MARGINAL TO FAIR RANGE OVER EASTERN MAINE... WITH GOOD VALUES OVER
THE REST OF THE NORTHEAST.

...MID ATLANTIC...

EXPECT PARTLY CLOUDY SKIES WHILE A WEAKENING SURFACE TROUGH
APPROACHING FROM THE OHIO VALLEY MAY SUPPORT SCATTERED LATE DAY
SHOWERS.  HIGHS SHOULD RANGE FROM THE MID 70S TO LOW 80S NORTH AND
UPPER 80S TO LOW 90S SOUTH.  WINDS ARE FORECAST TO AVERAGE FROM
THE WEST AT 5 TO 15 MPH.  VENTILATION INDICES ARE LIKELY TO BE
GOOD.

...MID-UPPER MISSISSIPPI VALLEY THROUGH THE OHIO VALLEY...

LOW PRESSURE TRACKING EAST-SOUTHEAST FROM THE CENTRAL PLAINS WILL
SUPPORT CLOUDY SKIES AND AN ORGANIZED AREA OF RAIN AND EMBEDDED
THUNDER ACROSS THE NORTH-CENTRAL MISSISSIPPI VALLEY INTO THE LOWER
OHIO VALLEY.  VERY WEAK HIGH PRESSURE WILL YIELD PARTLY CLOUDY
SKIES AND ONLY SCATTERED OR ISOLATED SHOWERS FROM THE UPPER
MISSISSIPPI VALLEY INTO THE UPPER OHIO VALLEY.  OVER NORTHERN
AREAS WINDS SHOULD BE LIGHT AND VARIABLE BECOMING FROM THE
NORTH-NORTHEAST AT 5 TO 10 MPH... WITH VARIABLE WINDS AT LESS THAN
10 MPH SOUTHEASTWARD INTO THE MID-UPPER OHIO VALLEY AS WELL.  FLOW
AROUND EASTERN PLAINS LOW PRESSURE WILL SUPPORT WINDS FROM THE
EAST.. SOUTHEAST.. OR SOUTH AT 5 TO 15 MPH OVER THE MID
MISSISSIPPI VALLEY AND LOWER OHIO VALLEY.  MOST LOCATIONS SHOULD
SEE HIGHS IN THE 70S WITH LOW TO MID 80S POSSIBLE OVER EXTREME
SOUTHERN AREAS.  SOME POCKETS OF POOR TO MARGINAL/FAIR VENTILATION
INDICES ARE POSSIBLE FROM THE UPPER MISSISSIPPI VALLEY INTO THE
MID OHIO VALLEY... WITH GOOD VALUES FARTHER EAST AND SOUTHWEST.

...TENNESSEE VALLEY/SOUTHERN APPALACHIANS...

HIGH PRESSURE CENTERED OVER THE SOUTHERN APPALACHIANS WILL
GRADUALLY GIVE WAY TO A WARM FRONT APPROACHING THE REGION FROM THE
SOUTH.  EXPECT INCREASING CLOUDS THOUGH MOST SCATTERED SHOWER
ACTIVITY SHOULD REMAIN JUST NORTH OF THE REGION.  HIGHS WILL BE IN
THE 80S OVER EASTERN TENNESSEE AND SOUTHERN APPALACHIANS WITH LOW
90S FARTHER WEST.  ANTICIPATE WINDS FROM THE SOUTHWEST AT 5 TO 15
MPH... WITH GOOD VENTILATION INDICES ACROSS THE REGION.

...SOUTHEAST/FLORIDA...

A STATIONARY FRONT OVER SOUTHERN ALABAMA/GEORGIA WILL LIFT
NORTHWARD AS A WARM FRONT DURING THE DAY SATURDAY.  SKIES SHOULD
BE PARTLY CLOUDY WITH SCATTERED SHOWERS AND THUNDERSTORMS
PRIMARILY CONFINED TO FLORIDA.  EXPECT HIGHS IN THE MID TO UPPER
90S OVER THE SOUTHEAST... LOW TO UPPER 90S OVER CENTRAL AND
NORTHERN FLORIDA... AND UPPER 80S OVER SOUTHERN FLORIDA.  WINDS
SHOULD BE FROM THE WEST AT LESS THAN 10 MPH OVER THE SOUTHEAST...
FROM THE SOUTHWEST AT 5 TO 10 MPH ALONG THE NORTHERN TWO THIRDS OF
THE FLORIDA GULF COAST... AND LIGHT AND VARIABLE ALONG THE
SOUTHERN GULF COAST.  MEANWHILE WINDS SHOULD BE FROM THE
SOUTH-SOUTHEAST AT 5 TO 10 MPH ALONG THE EASTERN FLORIDA COAST. 
VENTILATION INDICES MAY REACH FAIR TO MARGINAL LEVELS OVER EXTREME
SOUTHERN FLORIDA BUT THEY SHOULD BE GOOD ELSEWHERE.

...SOUTH-CENTRAL PLAINS TO CENTRAL GULF COAST...

PARTLY CLOUDY AND HOT WEATHER WILL PREVAIL OVER THE REGION WHICH
WILL BE TO THE SOUTHWEST OF A WARM FRONT LIFTING THROUGH THE
PLAINS AND SOUTH-CENTRAL MISSISSIPPI VALLEY.  A COLD FRONT DIPPING
INTO THE SOUTH-CENTRAL PLAINS LATE IN THE DAY MAY BE ACCOMPANIED
BY SCATTERED SHOWERS AND THUNDERSTORMS.  EXPECT HIGHS IN THE UPPER
90S TO LOW 100S... WITH WINDS GENERALLY FROM THE SOUTHWEST AT 10
TO 15 MPH.  VENTILATION INDICES WILL BE GOOD.

...SOUTHERN ROCKIES...

EXPECT PARTLY CLOUDY SKIES WITH SCATTERED SHOWERS AND
THUNDERSTORMS DEVELOPING IN THE AFTERNOON AS A SURFACE TROUGH
DEVELOPS FROM CENTRAL NEW MEXICO NORTHWARD.  HIGHS WILL RANGE FROM
THE 60S AND 70S AT HIGHER ELEVATIONS TO 80S AND LOW 90S AT LOWER
ELEVATIONS.  BY AFTERNOON EXPECT WINDS TO FLOW FROM THE EAST OR
SOUTHEAST AT 5 TO 15 MPH TO THE EAST OF THE EVOLVING TROUGH... AND
FROM THE NORTH OR WEST AT 5 TO 10 MPH TO THE WEST OF THE TROUGH. 
ANTICIPATE VENTILATION INDICES IN THE GOOD TO FAIR RANGE.  

...SOUTHWEST/INTERIOR CALIFORNIA...

SKIES WILL BE MOSTLY SUNNY THROUGH THE DAY EXCEPT FOR ISOLATED
LATE DAY SHOWERS AND THUNDERSTORMS OVER FAVORED TERRAIN OF CENTRAL
AND EASTERN ARIZONA.  EXPECT HIGHS IN THE UPPER 90S TO LOW 100S
OVER INTERIOR CALIFORNIA AND WITHIN THE 105 TO 110 RANGE OVER THE
DESERT SOUTHWEST.  HIGHER ELEVATIONS OF ARIZONA SHOULD SEE HIGHS
IN THE 70S OR 80S.  WINDS SHOULD RANGE BETWEEN THE SOUTH..
SOUTHWEST.. AND WEST AT 5 TO 15 MPH.  VENTILATION INDICES WILL
LIKELY BE GOOD ASIDE FROM POCKETS OF FAIR VALUES OVER CENTRAL
ARIZONA.

RAUSCH