BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, AUGUST 10, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME UNUSUAL AUGUST WEATHER BRINGS COOL TEMPERATURES AND RAIN SHOWERS.... A low pressure system moved through the region this morning bringing abnormally cool conditions throughout the entire morning and even into the early afternoon. The maximum temperature for the day was 63 degrees registered at 12:00 A.M. EDT, and at 1:53 P.M. it had fallen to 56 degrees. Rainfall was measured to be 0.14 in. High pressure is expected to build this evening allowing for a sunnier and warmer weekend. Today's observations: 7 A.M. Weather: Overcast stratus, light rain Temperature: 62F, Dew point: 55F, Wind: SSE at 5 kts Sea-level pressure: 29.96 inches Hg, rising Visibility: 40 miles 6-hour min temp: 61 deg. F 24-hour precip: Trace BHO SA 1155 E90 OVC 40R- 146/62/55/1505/996/ DRK K LYR NNW-NNE VSBY DCRSNG SW-NW/ 8/02/ 53008 MANUAL 6000/ 10062 20061 10 A.M. Weather: Scattered stratus fractus, overcast stratus, light rain Temperature: 59F, Dew point: 54F, Wind: SE at 5 kts Sea-level pressure: 29.99 inches Hg, rising Visibility: 10 miles, fog 3-hour precip: 0.08 in. BHO SA 1455 40 –SCT E70 OVC 10R- 156/59/54/1306/999/ STFRA THN FG 8/72/ 51010 ASOS 60008 MANUAL 6008/ 1 P.M. Weather: Overcast stratus, few small cumulus NW-NE, light rain Temperature: 56F, Dew point: 52F, Wind: ESE at 6 kts Sea-level pressure: 29.97 inches Hg, and falling Visibility: 20 miles 6-hour max. temp: 62 deg. F 6-hour precip: 0.14 in. BHO SA 1755 20 –SCT E70 OVC 20R- 150/56/52/1206/997/ FEW SM CU NW-NE WND GRDLY BACKING VSBY INCRSNG W-NNW/ 8/12/ 57006 ASOS 60012 MANUAL 6014/ 10062 20056 WEATHER SUMMARY FOR THURSDAY, AUGUST 9 TEMPERATURE (DEGREES F) MAX.....75 NORMAL.....80 MIN.....60 NORMAL.....62 MEAN....68 NORMAL.....71 DEPARTURE FROM 30-YEAR NORMAL.........-3 TOTAL DEPARTURE FOR THE MONTH........+34 (+3.6 DEGREES/DAY) PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..............32 NW AT 12:55 A.M. * AEROVANE...............30 NW AT 2:13 A.M. ASOS...................N/A # DAVIS..................32 WNW AT 12:30 A.M. FASTEST MILE FOR YESTERDAY................24 NW AT 12:31 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A # MAXIMUM 2-MINUTE DAVIS AVERAGE............24 NW AT 12:31 A.M. AVERAGE WIND SPEED AND DIRECTION..........8.8 NE ASOS...................N/A # DAVIS..................9.0 N [002 deg.] * last of several occurrences... # ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN THAT DATA WILL RESUME PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.....-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.27 DEPARTURE.....-0.86 ASOS..............0.25 TOTAL PRECIPITATION FOR THE YEAR..........30.63 DEPARTURE.....+0.09 ASOS FOR YEAR..........29.92 PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 8/1 84/67/76/+4/0/782/94 20 NNE 8/2 92/68/80/+8/0/823/95 21 S 8/3 92/70/81/+9/0/760/88 28 SSW 8/4 89/71/80/+8/0/827/96 29 WSW 8/5 80/62/71/-1/0/.../.. 23 SSE 8/6 77/61/69/-3/0.05/129/15 36 SSE Aero 34 MPH SSE TSTM 8/7 82/67/75/+4/0.12/.../.. 15 SSE 8/8 88/70/79/+8/0.10/.../.. 36 S 8/9 75/60/68/-3/0/.../.. 32 NW 8/10 morning low temp. 61 deg; normal low now 62 deg. NEW DAILY RECORDS FOR AUGUST 2007: None to date DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 10 HIGH 101F IN 1949 [STATION RECORD MAXIMUM - Tied with 8/2/1975] LOW 49F IN 1964 PRE 2.27 INS IN 1952 PEAK GUST 88e MPH S IN 1976 RECORDS FOR AUGUST 11 HIGH 97F IN 1944 LOW 49F IN 1972 PRECIP 3.13 INCHES IN 1990 PEAK GUST 44 MPH SW IN 1971 TODAY'S REPORT PREPARED By: Eli Melaas