BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, JULY 15, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME TEMPERATURE REACHES 90 DEGREES TODAY WHICH IS LIKELY THE BEGINNING OF A SECOND JULY HEAT WAVE OPPRESSIVE HUMIDITY CONTINUES WITH DEW POINTS LOW 70'S Temperatures have reached 90 degrees early this afternoon as we likely start the second heat wave of the month. This was day number two of a heat wave in much of the local area. Very humid air continues to prevail with dew points around 70 degrees. Today's Observations: 7 A.M. Weather: Thin scattered cirrus, few altocumulus and altocumulus castellanus NW-NE, few altocumulus lenticularis E-S, few altocumulus castellanus SSE Temperature: 78F; Dew Point: 72F; Wind: NNW at 5 kts. Sea-level pressure: 30.21 ins. Hg, rising slightly Visibility: 20 miles, hazy 6-hr min. temp: 72F BHO SA 1155 250 –SCT 20 230/78/72/3305/021/ FEW AC/ACC NNW-NNE FEW ACSL E-S FEW ACC SSE HAZY ALQDS/ 8/081 53002 10078 20072 10 A.M. Weather: Scattered cumulus, moderate cumulus, few towering cumulus, vicinity of station N-NE, thin scattered cirrus, thin broken cirrus Temperature: 85F; Dew Point: 69F; Wind: NW at 5 kts. Sea-level pressure: 30.19 ins. Hg, falling slightly Visibility: 30 miles, 20 miles NE-SE, hazy BHO SA 1455 35 SCT 250 –SCT 300 –BKN 30 225/85/69/3105/019/ CU BLDG ALQDS FEW TCU VC N-NE MDT CU ALQDS VSBY NE-SE 20 HAZY ALQDS/ 8/201 58005 1 P.M. Weather: Scattered cumulus, moderate cumulus, few towering cumulus, dense cirrus SW-overhead-NE Temperature: 89F; Dew Point: 69F; Wind: NW at 8 kts, Wind: Direction variable WSW-N Sea-level pressure: 30.16 ins. Hg, falling Visibility: 40 miles, except 45 miles WNW 6-hr max. temp: 90F BHO SA 1755 50 SCT 220 SCT 250 SCT 40 215/89/69/3208/016/ FEW TCU MDT CU ALQDS DNS CI SW-OVHD-NE WND 25V35/ 8/202 57010 10090 20078 WEATHER SUMMARY FOR SUNDAY, JULY 14, 2013 TEMPERATURE (DEGREES F) MAX.....89 NORMAL.....81 MIN.....71 NORMAL.....63 MEAN....80 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.....................+8 TOTAL DEPARTURE FOR THE MONTH....................+57 [+3.9 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................16 W AT 12:49 P.M. AERO.....................16 W AT 12:49 P.M. ASOS.....................16 W AT 12:49 P.M. DAVIS....................15 W AT 12:49 P.M. RMY 16 FASTEST MILE FOR YESTERDAY..................10 W AT 3:33 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...............12 W AT 12:37 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............11 W AT 12:50 P.M. AVERAGE WIND SPEED AND DIRECTION...........5.3 W ASOS....................4.9 DAVIS...................4.9 W [260 deg.] *last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE............-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.01 DEPARTURE............-0.65 ASOS..............1.00 TOTAL PRECIPITATION FOR THE YEAR..........33.21 DEPARTURE............+4.58 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/.../.. 18 NE AERO 20 MPH NE RMY 20 TSTM 7/9 72/63/68/-4/0.01/.../.. 14 ENE AERO 14 MPH ENE RMY 14 7/10 84/65/75/+3/T/.../.. 32 S AERO 36 MPH S RMY 35 7/11 79/69/74/+2/0.62/.../.. 23 W AERO 23 MPH W RMY N/A TSTM 7/12 70/62/66/-6/0.00/.../.. 29 NE AERO 29 MPH NE RMY 30 7/13 75/62/69/-3/0.08/.../.. 21 ENE AERO 20 MPH ENE RMY N/A 7/14 89/71/80/+8/0.00/.../.. 16 W AERO 16 NOG W RNT 16 7/15 morning low temp: 72F; the normal low is now 63F DAILY RECORDS FOR JULY 2013 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 15 HIGH 94F IN 1995 LOW 50F IN 1929, 1930 PRECIP 1.64 INS IN 1896 WIND 71 MPH WNW IN 2002 RECORDS FOR JULY 16 HIGH 94F IN 1968, 1980, 1983, 1999 LOW 50F IN 1889, 1903 PRECIP 0.89 INS IN 1919 WIND 48e MPH SW 1944 TODAY'S REPORT PREPARED BY: Robert Skilling, Marc Douglas, Mark Medlinskas