BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, AUGUST 23, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED Today's observations: 8 A.M. EDT Weather: Thin scattered cirrus, few distant stratocumulus and stratus distant offshore Temperature: 63F, Dew point: 58F, Wind: S at 8 kts Sea-level pressure: 30.38 inches Hg, rising Visibility: 60 miles 6-hourly minimum temperature: 60F 24-hourly rainfall: 0.00 inches BHO SA 1155 250 –SCT 60 287/63/58/1908/038/ FEW SC DSNT SE STRA LYR DSNT OFFSHR ESE-S WND LGT/ 8/501 51007 10063 20060 11 A.M. EDT Weather: Thin scattered cirrus, few cumulus distant ESE-SSW Temperature: 73F, Dew point: 54F, Wind: SSW at 6 kts, Sea-level pressure: 30.35 inches Hg, falling Visibility: 70 miles BHO SA 1455 250 –SCT 70 279/73/54/2006/035/ FEW CU DSNT ESE-SSW WND LGT/ 8/101 58008 2 P.M. EDT Weather: Thin broken cirrus, cumulus distant SE-W and NW Temperature: 79F, Dew point: 49F, Wind: SSE at 8 kts, Wind: light and variable Sea-level pressure: 30.29 inches Hg, falling Visibility: 75 miles 6-hourly max. temp. 79F BHO SA 1755 250 –BKN 75 258/79/49/1608/029/ CU DSNT SE-W FEW CU NW WND LGT AND VRB/ 8/101 58021 10079 20063 WEATHER SUMMARY FOR FRIDAY, AUGUST 22 TEMPERATURE (DEGREES F) MAX.....82 NORMAL.....78 MIN.....60 NORMAL.....60 MEAN....71 NORMAL.....69 DEPARTURE FROM 30-YEAR NORMAL.............+2 TOTAL DEPARTURE FOR THE MONTH............-41 [-2.1 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............20 S AT 8:45 P.M. * AEROVANE.............18 S AT 8:07 P.M. ASOS.................20 S AT 8:37 P.M. DAVIS................20 SSE AT 8:06 P.M. FASTEST MILE FOR YESTERDAY..............14 S AT 8:45 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........15 SSW AT 5:14 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........14 S AT 10:59 P.M. AVERAGE..............8.3 S ASOS.................7.8 DAVIS................7.3 S [186 deg] * Last of several occurrences. 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..........4.50 DEPARTURE......+1.67 ASOS..............4.55 TOTAL PRECIPITATION FOR THE YEAR..........35.43 DEPARTURE......+3.19 ASOS.............37.98 # # Includes erroneous ASOS precipitation data on 2/13/08. PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 8/1 85/66/76/+4/0.00/719/83 16 WSW 8/2 80/65/73/+1/0.80/346/40 21 NW TSTM 8/3 81/61/71/-1/0.56/422/49 52 NW Aero 55 MPH NW TSTM 8/4 79/60/70/-2/0.01/731/85 25 WNW 8/5 72/63/68/-4/T/377/44 21 NE 8/6 64/60/62/-10/0.55/000/00 31 ESE 8/7 72/61/67/-4/0.41/009/01 21 SW TSTM 8/8 77/59/68/-3/0.47/442/52 23 ENE TSTM 8/9 78/59/69/-2/0.00/534/63 16 SSE 8/10 80/61/71/0/0.08/474/56 24 ESE TSTM 8/11 67/61/64/-7/0.06/025/03 25 E 8/12 72/58/65/-6/0.18/134/16 21 NNW TSTM 8/13 79/59/69/-2/0.00/778/93 18 WSW 8/14 78/63/71/+1/T/334/40 21 NNW 8/15 79/62/71/+1/1.32/125/15 18 SSW TSTM 8/16 79/61/70/0/0.01/647/78 23 WSW 8/17 80/59/70/0/0.00/787/95 28 WSW 8/18 85/64/75/+5/0.00/759/92 28 SSW 8/19 78/54/66/-4/0.05/576/70 29 WNW TSTM 8/20 72/50/61/-8/0/812/99 28 WNW 8/21 78/55/67/-2/0/801/98 16 WNW 8/22 82/60/71/+2/0/.../.. 20 S 8/23 morning low temp. of 60F; our normal low is now 60F NEW DAILY RECORDS FOR AUGUST 8/3 - PEAK GUST OF 52 MPH FROM THE NW IS NEW RECORD FOR THE DATE; PREVIOUS RECORD 41 MPH NE IN 1964 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 23 HIGH 88F IN 1918, 1947, 1949, 1996 LOW 45F IN 1923 PRECIP 1.37 INCHES IN 1955 PEAK GUST 60e MPH NW 1940 RECORDS FOR AUGUST 24 HIGH 92F IN 1947 LOW 43F IN 1971 PRECIP 1.92 INCHES IN 1897 PEAK GUST 54 MPH W 1986 TODAY'S REPORT PREPARED By: Mike Iacono