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August 2009
North Country Monthly Climate Summary

TEMPERATURE SUMMARY...

THE TREND OF BELOW NORMAL TEMPERATURES DURING THE FIRST TWO MONTHS OF SUMMER WAS BROKEN IN AUGUST WITH ABOVE AVERAGE READINGS ACROSS THE NORTH COUNTRY. ON AVERAGE TEMPERATURE READINGS RAN .5 F TO 2 F DEGREES ABOVE AVERAGE WITH THE WARMEST ANOMALIES ACROSS THE CHAMPLAIN VALLEY AND CENTRAL VERMONT. SUMMER FINALLY ARRIVED IN THE MIDDLE PART OF AUGUST WITH WELL ABOVE AVERAGE READINGS FROM THE 10-25TH. MOST LOCATIONS ALSO HIT THE 90 DEGREE MARK ON THE 17 & 18TH FOR THE FIRST TIME THIS YEAR. AFTER THE 25TH, COOLER AIR ARRIVED AND TEMPERATUES FINISHED UP THE MONTH BELOW AVERAGE WITH THE COLDEST READINGS OF THE MONTH ON THE 27 & 28TH.

TEMPERATURE STATISTICS ACROSS THE NORTH COUNTRY FOR THE MONTH OF August...

  Burlington Montpelier Massena Saint Johnsbury
Avg. Temp 69.8 66.9 67.9 67.3
Departure +1.6 +1.8 +0.6 +0.5
Highest 90 ON 18,17 89 ON 18 91 ON 17 90 ON 18
Lowest 46 ON 28,27 47 ON 13,06 42 ON 28,27 41 ON 28

BELOW ARE DAILY TEMPERATURE GRAPHS FOR THE MONTH OF MAY FOR EACH BURLINGTON, MONTPELIER, MASSENA, AND SAINT JOHNSBURY.

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PRECIPITATION SUMMARY...

AUGUST WAS A VERY VARIABLE MONTH FOR PRECIPITATION ACROSS THE NORTH COUNTRY WITH SOME LOCATIONS ABOVE AVERAGE, OTHERS NEAR NORMAL AND SOME AREAS BELOW AVERAGE. THE MONTHLY RAIN GAUGE TOTALS IMAGE BELOW SHOWS THE PRECIPITATION VARIABILITY ACROSS THE REGION. THE HIGHEST RAINFALL AMOUNTS WERE LOCATED ACROSS THE ADIRONDACKS OF NEW YORK WITH 6.11" OF RAIN AT TUPPER LAKE. ANOTHER LOCAL MAXIMUM WAS IN SOUTHERN VERMONT ACROSS RUTLAND AND WINDSOR COUNTY WITH SOME OF THE HIGHER READINGS AT RUTLAND COOP WITH 7.71" AND LUDLOW WITH 7.83". THE NORTHERN GREEN MOUNTIANS ALSO HAD A LOCAL MAXIMUM WITH MOUNT MANSFIELD REPORTING 6.04" FOR THE MONTH. THE LOWER ELEVATION VALLEYS OF VERMONT HAD BELOW AVERAGE RAINFALL WITH BURLINGTON, MONTPELIER, AND SAINT JOHNSBURY ALL RUNNING 1.5" TO 2.0" BELOW AVERAGE FOR THE MONTH. RAINFALL AMOUNTS ACROSS THE SAINT LAWRENCE VALLEY AND THE HIGHER TERRAIN OF NORTHEAST KINGOM WERE NEAR NORMAL. AT BURLINGTON EVEN WITH A MONTHLY RAINFALL DEFICIT OF -1.67" THE YEARLY TOTAL IS 23.82", WHICH IS +.97 ABOVE THE YEARLY NORMAL.

PRECIPITATION STATISTICS ACROSS THE NORTH COUNTRY FOR THE MONTH OF August...

  Burlington Montpelier Massena Saint Johnsbury
Monthly Total " 2.34 2.08 3.64 2.35
Departure -1.67 -1.93 +0.13 -1.86
Greatest 24hr 0.86 ON 2-3 0.85 ON 28-29 1.13 ON 20-21 0.81 ON 12
SNOW/SLEET
Monthly Total " 0 0 0 0
Departure 0 0 0 0
Greatest 24hr 0 0 0 0

BURLINGTON FORECAST AREA ACCUMULATED MONTHLY RAIN GAUGE PRECIPITATION (IN INCHES) FOR THE MONTH OF August.

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MONTHLY WEATHER PATTERNS AND GLOBAL CLIMATE DRIVERS...

THE WEATHER PATTERN OF AUGUST WAS MUCH DIFFERENT THEN THE PREVIOUS TWO SUMMER MONTHS. THE MEAN 500MB CUT-OFF LOW THAT WAS OVER THE REGION RETROGRADED TO THE CENTRAL PLAINS. STRONG ANOMALOUS 500MB RIDGES CENTERS WERE LOCATED OVER THE WESTERN SEABOARD AND ACROSS THE ATLANTIC OCEAN. THIS ALLOWED THE BURMUDA HIGH TO SHIFT WEST ALONG THE EASTERN SEABOARD AND ADVECT WARM SOUTHERLY FLOW INTO THE REGION. THE SENSIBLE WEATHER THAT RESULTED WAS WARM AND MUGGY CONDITIONS...ESPECIALLY DURING THE MIDDLE PART OF THE MONTH. TOWARDS THE END OF THE MONTH THE BURMUDA HIGH RETREATED SOUTH AS COOL CONTINENTAL POLAR AIR BUILT INTO THE REGION FROM HUDSON BAY.

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THE CLIMATE PREDICTION CENTER IS FORECASTING EQUAL CHANCES FOR RAINFALL AND TEMPERATURE ACROSS NEW YORK...WITH A SLIGHTLY HIGHER PROBABILITY FOR ABOVE AVERAGE TEMPERATURES ACROSS CENTRAL AND NORTHERN VERMONT. WITH THIS FORECAST THE MONTH OF SEPTEMBER HAS A BETTER CHANCE TO BE WARMER THEN COLDER. RAINFALL TRENDS LOOK TO BE NEAR AVERAGE FOR THE MONTH OF SEPTEMBER.

EL NINO CONTINUES TO GAIN STRENGTH OUT IN THE TROPICAL PACIFIC OCEAN. THE OFFICIAL FORECAST HAS EL NINO STRENGTHENING THROUGH THE FALL AND LASTING THROUGH THE WINTER MONTHS INTO EARLY 2010.

CLIMATE PREDICTION CENTER SEPTEMBER 2009 PRECIPITATION OUTLOOK...

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CLIMATE PREDICITION CENTER SEPTEMBER 2009 TEMPERATURE OUTLOOK...

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Figure 1: Burlington Monthly Temperature Trend
Figure 2: Montpelier Monthly Temperature Trend
Figure 3: Massena Monthly Temperature Trend
Figure 4: Saint Johnsbury Temperature Trend
Figure 5: Monthly Precipitation Map
Figure 6: 500MB Geopotential Height Anomalies
Figure 7: Climate Prediction Center Precipitation Outlook
Figure 8: Climate Prediction Center Temperature Outlook