BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, JULY 11, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME MORNING THUNDERSTORM BRINGS A QUARTER INCH OF RAIN TEMPERATURES IN THE 70'S WITH DEW POINTS IN LOW 70'S AS VERY HUMID AIR MASS CONTINUES IN PLACE The total rainfall for the morning rain with thunder reached 0.23 inch, not more than moderate intensity for a time. The air mass continues very humid today with dew points right around the lower 70's. Today's Observations: 7 A.M. Weather: Sky obscured by dense fog, stratus drifting over summit, very light drizzle Temperature: 75F; Dew Point: 73F; Wind: WSW at 6 kts. Sea-level pressure: 29.83 ins. Hg, rising then falling slightly Visibility: 4 miles in thin fog 6-hr min. temp: 71F 6 hr precip: none 24-hr precip: trace BHO SA 1155 80 SCT E130 BKN 250 OVC 4F 101/75/73/2406/983/ FEW STRA DSSPTNG AC LYRS INVADING CIG LWR/DRK SW-W CI/THN SPTS IOVC/SML BINOVC NE-SE VSBY ENE 6/ 8/651/ 50004 10075 20071 10 A.M. Weather: Overcast nimbostratus, ceiling higher SW-NW, dark sky E-S, thunderstorm began 9:19 A.M. EST ended at 9:45 A.M. EST, few stratus fractus below summits east, few stratocumulus to the SW thru NW Temperature: 70F; Dew Point: 68F; Wind: WSW at 4 kts. Sea-level pressure: 29.86 ins. Hg, rising then more slowly Visibility: 6 miles, light rain and fog, visibility SW-NW 8 miles 3-hr precip: 0.22 inch BHO SA 1455 E95 OVC 6R-F 113/70/68/2504/986/ TB19E45 MOVD E DRK E-S HIER CIG SW-NW FEW STFRA BLO SMTS E FEW SC SW-NW VSBY SW-NW 8/ 8/52/ 51012 MANUAL 6022/ ASOS 60021 1 P.M. Weather: Scattered altocumulus, altocumulus castellanus, overcast dense cirrus, small cumulonibus distant WNW, moderate cumulus, few towering cumulus, cumulus building distant W-N, line stratocumulus with moderate cumuloform tps extending E-SSw, dense cirrus overcast, sun dimly visible, hazy Temperature: 77F; Dew Point: 71F; Wind: SSW at 7 kts Sea-level pressure: 29.85 ins. Hg, falling slightly Visibility: 25 miles, hazy 6-hour max. temp: 77F 6-hour precip: 0.23 in. BHO SA 1755 90 SCT E200 OVC 25 109/77/71/2007/985/ SML CB DSNT WNW MOVG SLWLY E MDT CU/FEW TCU/CU BLDG DSNT W-N LINE SC MDT CUFRM TOPS XTDNG DSNT E-SSW DNS CI OVC SUN DMLY VSB HAZY/ 8/382 58004 MANUAL 6024/ ASOS 60024 10077 20069 WEATHER SUMMARY FOR WEDNESDAY, JULY 10, 2013 TEMPERATURE (DEGREES F) MAX.....84 NORMAL.....81 MIN.....65 NORMAL.....63 MEAN....75 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.....................+3 TOTAL DEPARTURE FOR THE MONTH....................+56 [+5.4 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................32 S AT 3:43 P.M. AERO.....................36 S AT 4:03 P.M. ASOS.....................36 S AT 3:43 P.M. DAVIS....................33 S AT 3:43 P.M. RMY 35 FASTEST MILE FOR YESTERDAY..................26 S AT 4:03 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...............26 S AT 4:03 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............26 S AT 4:04 P.M. AVERAGE WIND SPEED AND DIRECTION..........11.7 S ASOS...................11.4 DAVIS..................10.4 S [170 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....Trace DEPARTURE............-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.31 DEPARTURE............-0.81 ASOS..............0.30 TOTAL PRECIPITATION FOR THE YEAR..........32.51 DEPARTURE............+4.42 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 morning low temp: 69F; 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 11 HIGH 98F IN 1911 LOW 49F IN 1890 PRECIP 1.87 INS IN 1959 WIND 53 MPH NW IN 1988 RECORDS FOR JULY 12 HIGH 97F IN 1943 LOW 48F IN 1945 PRECIP 1.43 INS IN 1975 WIND 48e MPH SSW IN 1944 TODAY'S REPORT PREPARED BY: Robert Skilling/Marc Douglas