BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JULY 27, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME WARM WEATHER RETURNS Dense fog reduced visibility to zero at times early this morning on the summit. By 8AM however, the fog began to burn off quickly, leaving partly cloudy skies as cumulus clouds developed throughout the day, along with some cirrus clouds. After two days of cool, rainy weather, with the temperature never breaking 70F, the high temperature so far today is 81F, equal to the average for the date. Winds have become more westerly and southwesterly today, bringing the warmer air in. No wind gusts greater than 20mph have been observed so far today and the average wind speed since 7AM this morning has only been about 5-8mph. An additional 0.22 inches of rain fell after 7AM yesterday morning, and our monthly rainfall deficit is now under a third of an inch. BHO Greatest Number of 90-Degree Days per Month, (1885-2013) 1) 14 in July 1952 2) 13 in August 2002 3) 10 in August 1944 10 in July 1949 10 in July 1963 10 in July 2010 10 in July 2013 (through 7/26) 8) 9 in July 1911 9 in August 1928 10) 8 in August 1949 8 in July 1963 8 in July 1988 Today's Observations: 7 A.M. Weather: Sky obscured by dense fog, stratus drifting over summit Temperature: 64F; Dew Point: 64F; Wind: SW at 7 kts Sea-level pressure: 30.08 ins. Hg, rising then rising more slowly Visibility: 1/16 mile, dense fog 24-hr precip: 0.22 inch 6-hr min. temp: 60F BHO SA 1155 W2 X 1/16F 185/64/64/2307/008/ STRA DRFTNG OVR SMT/ 8//// 51016 MANUAL 70022 ASOS 70021 10064 20060 10 A.M. Weather: Scattered cirrus, few cumulus and cumulus fractus all quadrants, altostratus layer (with altocumulus) distant SW-WNW Temperature: 74F; Dew Point: 66F; Wind: WSW 6 kts, Wind: Direction variable SSW-W Sea-level pressure: 30.09 ins. Hg, rising then falling Visibility: 35 miles, distant haze BHO SA 1455 250 SCT 35 188/74/66/2406/009/ FEW CU AND CUFRA ALQDS AS/AC LYR DSNT SW-WNW DSNT HZ WND 20V27/ 8/171 50003 1 P.M. Weather: Scattered cumulus, scattered cirrus, dense cirrus distant S-NNW Temperature: 80F; Dew Point: 63F; Wind: SW at 6 kts, Wind: Direction variable SSW-W Sea-level pressure: 30.06 ins. Hg, falling then falling more rapidly Visibility: 50 miles, light distant haze 6-hr max. temp: 81F BHO SA 1755 35 SCT 250 SCT 50 180/80/63/2306/006/ DNS CI DSNT S-NNW LGT DSNT HZ WND 21V27/ 8/101 58008 10081 20064 WEATHER SUMMARY FOR FRIDAY, JULY 26, 2013 TEMPERATURE (DEGREES F) MAX.....67 NORMAL.....81 MIN.....59 NORMAL.....63 MEAN....63 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.....................-9 TOTAL DEPARTURE FOR THE MONTH....................+113 [+4.1 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................23 NNW AT 10:54 A.M. AERO.....................23 N AT 8:43 A.M. ASOS.....................25 N AT 2:39 A.M. DAVIS....................24 N AT 2:39 A.M. RMY 23 FASTEST MILE FOR YESTERDAY..................18 NW AT 3:27 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...............17 NW AT 3:29 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............17 NW AT 3:07 P.M. AVERAGE WIND SPEED AND DIRECTION..........11.3 N ASOS...................11.2 DAVIS...................9.8 NNW [328 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.22 DEPARTURE............+0.08 ASOS..............0.21 TOTAL PRECIPITATION FOR THE MONTH..........2.96 DEPARTURE............-0.31 ASOS..............2.92 TOTAL PRECIPITATION FOR THE YEAR..........35.16 DEPARTURE............+4.92 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR JULY 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust RMY: RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 7/1 82/69/76/+6/0.05/247/27 29 S AERO 31 MPH SSW RMY 32 7/2 82/61/72/+2/T/100/11 23 SSW AERO 23 MPH SSW RMY 25 7/3 87/62/75/+4/T/556/61 28 SW AERO 30 MPH SW RMY 30 7/4 90/71/81/+10/0.00/811/89 25 WSW AERO 26 MPH SW RMY 28 7/5 92/73/83/+12/0.00/874/96 24 W AERO 25 MPH WSW RMY 25 7/6 90/73/82/+11/0.00/836/92 25 WNW AERO 25 MPH WNW RMY 26 7/7 91/72/82/+11/0.21/508/56 38 SSW AERO 43 MPH SSW RMY 44 TSTM 7/8 82/64/73/+1/0.04/617/68 18 NE AERO 20 MPH NE RMY 20 TSTM 7/9 72/63/68/-4/0.01/054/06 14 ENE AERO 14 MPH ENE RMY 14 7/10 84/65/75/+3/T/335/37 32 S AERO 36 MPH S RMY 35 7/11 79/69/74/+2/0.62/009/01 23 W AERO 23 MPH W RMY N/A TSTM 7/12 70/62/66/-6/0.00/162/18 29 NE AERO 29 MPH NE RMY 30 7/13 75/62/69/-3/0.08/009/01 21 ENE AERO 20 MPH ENE RMY N/A 7/14 89/71/80/+8/0.00/477/53 16 W AERO 16 MPH W RMY 16 7/15 91/72/82/+10/0.00/665/74 17 NW AERO 16 MPH NW RMY 18 7/16 91/71/81/+9/0.00/843/94 18 NNW AERO 16 MPH NNW RMY 16 7/17 93/74/84/+12/0.00/841/94 22 SW AERO 23 MPH SW RMY 25 7/18 90/75/83/+11/0.00/724/81 20 S AERO 21 MPH S RMY 22 7/19 95/76/86/+14/0.00/723/81 36 WSW AERO 38 MPH WSW RMY 38 7/20 93/72/82/+10/0.00/570/64 29 W AERO 30 MPH W RMY 31 TSTM 7/21 82/68/75/+3/0.00/568/64 16 NE AERO 16 MPH NE RMY 17 7/22 80/67/74/+2/T/514/58 17 NE AERO 17 MPH NE RMY 19 TSTM 7/23 82/68/75/+3/0.82/159/18 35 WSW AERO 36 MPH WSW RMY 39 7/24 84/64/74/+2/0.00/.../.. 23 N AERO 23 MPH N RMY 23 7/25 64/57/61/-11/..../000/00 24 NNE AERO 24 MPH NNE RMY 25 7/26 67/59/63/-9/..../000/00 23 NNW AERO 23 MPH N RMY 23 7/27 morning low temp: 60F; the normal low is now 63F DAILY RECORDS FOR JULY 2013 7/14 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F; ties previous record of 71F set in 1997 7/15 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F; surpasses previous record of 70F set in 1901, 1934, 1995 7/16 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F; ties previous record of 71F set in 1901, 1958, 1968 7/17 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F; ties previous record of 74F set in 1900 7/18 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F; surpasses previous record of 73F set in 1900, 1999 7/19 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F; surpasses previous record of 72F set in 1949, 1991, 2005 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 27 HIGH 95F IN 1949, 1963 LOW 50F IN 1920, 2001 PRE 4.01 INS IN 1979 WIND 47 MPH ENE IN 1984 RECORDS FOR JULY 28 HIGH 97F IN 1931 LOW 49F IN 1903 PRECIP 3.32 INCHES IN 1911 PEAK GUST 62 MPH SW IN 2006 TODAY'S REPORT PREPARED BY: Jonathan O'Brien and William Wilson