BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, JULY 28, 2012 ALL TIMES ARE IN EASTERN STANDARD TIME MOSTLY SUNNY THIS MORNING WITH ADVANCING CLOUDS THIS AFTERNOON... SHOWERS AND THUNDERSTORMS OVER WESTERN NEW ENGLAND... An onshore flow from the NE has remained persistent since Friday morning resulting in one of the cooler days this month yesterday with a high temperature of only 73 deg F. Thin fog was observed early this morning and a dense fog bank remained over the harbor to the NE all morning. From the morning low of 65, the temperature has again only climbed to the middle 70s as of early afternoon. Only a trace of rainfall was observed on Friday during a few brief periods of very light showers and light drizzle. An extensive area of showers and thunderstorms is developing this afternoon over western New England and eastern New York. Some of the cumulonimbus and cumulus congestus are becoming visible from the summit as of 2 PM EDT. Today's observations: 7 A.M. Weather: Scattered altocumulus, scattered cirrus, few stratus NNE-NE, few higher altocumulus, thin fog all quadrants, hazy Temperature: 68F; Dew Point: 65F; Wind: E at 3 kts, Wind: Light Sea-level pressure: 30.00 ins. Hg, increasing then steady Visibility: 7 miles, 5 miles N-E 24-hour precip: Trace 6-hour min. temp: 66F BHO SA 1155 120 SCT 220 SCT 7 158/68/65/0803/000/ FEW ST NNE-NE FEW HIR AC VSBY N-E 5 THN F ALQDS WND LGT/ 8/671 51010 10068 20066 10 A.M. Weather: Scattered altocumulus, scattered dense cirrus, scattered cirrus, few cumulus forming W-NNE and E-SSE, fog bank offshore NE, hazy Temperature: 75F; Dew Point: 64F; Wind: NE at 6 kts, Wind: Light and variable Sea-level pressure: 30.01 ins. Hg, increasing Visibility: 20 miles, 7 miles NNE-NE, 35 miles S BHO SA 1455 120 SCT 180 SCT 250 SCT 20 161/75/64/0506/001/ FEW CU FRMNG W-NNE AND E-SSE FG BNK OFFSHORE NE VSBY NNE-NE 7 S 35 HAZY WND LGT AND VRB/ 8/131 53003 1 P.M. Weather: Scattered cumulus, scattered altocumulus, scattered cirrus, few cumulus congestus distant NW, few lower altocumulus WNW-NW, cumulonimbus anvil distant W, hazy Temperature: 77F; Dew Point: 66F; Wind: NE at 10 kts, Wind: Direction variable NNE-E Sea-level pressure: 29.97 ins. Hg, falling Visibility: 25 miles, 12 miles NE, 35 miles S, hazy 6-hour max temp: 78F BHO SA 1755 25 SCT 150 SCT 250 SCT 25 150/77/66/0610/997/ FEW CU CONGESTUS DSNT NW FEW LWR AC WNW-NW CB ANVIL DSNT W VSBY NE 12 S 35 HAZY WND 03V09/ 8/131 57011 10078 20068 WEATHER SUMMARY FOR FRIDAY, JULY 27 TEMPERATURE (DEGREES F) MAX.....73 NORMAL.....81 MIN.....66 NORMAL.....63 MEAN....70 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL......................-2 TOTAL DEPARTURE FOR THE MONTH.....................+92 [+3.2 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............21 WSW AT 12:30 A.M. * AERO..................24 WSW AT 12:01 A.M. ASOS..................24 W AT 12:00 A.M. DAVIS.................N/A RMY N/A THE FASTEST MILE FOR YESTERDAY...........16 WSW AT 12:12 A.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............16 W AT 1:04 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........16 WSW AT 12:01 A.M. AVERAGE WIND SPEED AND DIRECTION........7.4 NE ASOS.................6.0 DAVIS................6.4 N [008 deg] * Last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...Trace DEPARTURE...........-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.95 DEPARTURE...........-1.47 ASOS..............1.94 TOTAL PRECIPITATION FOR THE YEAR..........19.64 DEPARTURE..........-10.75 ASOS.............19.56 PRELIMINARY CLIMATE SUMMARY FOR JULY 2012 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 89/67/78/+8/0.01/676/74 33 WSW AERO 32 MPH WSW RMY 34 TSTM 7/2 84/66/75/+5/T/644/71 23 W AERO 22 MPH W RMY 23 7/3 85/63/74/+3/0.00/787/86 23 W AERO 21 MPH W RMY 20 7/4 85/66/76/+5/0.37/480/53 20 W AERO 20 MPH W RMY 23 TSTM 7/5 81/68/75/+4/0.00/729/80 23 NW AERO 23 MPH NW RMY 22 7/6 86/64/75/+4/0.00/753/83 18 SSW AERO 18 MPH SSW RMY 19 7/7 81/69/75/+4/T/224/25 23 W AERO 23 MPH W RMY 24 7/8 87/66/77/+5/0.00/814/90 23 W AERO 23 MPH W RMY 25 7/9 82/61/72/0/0.00/738/85 22 W AERO 21 MPH W RMY 23 7/10 83/61/72/0/0.00/852/98 18 W AERO 18 MPH W RMY 18 7/11 84/64/74/+2/0.00/768/88 21 W AERO 21 MPH W RMY 23 7/12 89/64/77/+5/0.00/875/97 25 SSW AERO 25 MPH SSW RMY 26 7/13 89/66/78/+6/0.00/604/67 28 S AERO 27 MPH S RMY 29 7/14 90/69/80/+8/0.00/521/58 24 W AERO 22 MPH W RMY 23 7/15 91/68/80/+8/T/539/60 18 SW AERO 18 MPH SSW RMY 20 7/16 91/70/81/+9/T/771/86 23 NW AERO 23 MPH NW RMY 24 7/17 95/71/83/+11/0.00/831/93 33 SSW AERO 33 MPH SSW RMY 35 7/18 91/69/80/+8/1.45/312/36 40 NE AERO 39 MPH NE RMY 41 TSTM 7/19 81/63/72/0/0.00/516/60 21 NNW AERO 18 MPH NNW RMY 18 7/20 70/61/66/-6/0.00/60/7 18 E AERO 18 MPH E RMY 19 7/21 77/58/68/-4/0.00/834/97 20 ENE AERO 20 MPH SSE RMY 19 7/22 84/59/72/0/0.00/834/98 24 S AERO 24 MPH S RMY 27 7/23 84/63/74/+2/0.02/354/40 27 SSW AERO 29 MPH SSW RMY 29 7/24 88/65/77/+5/0.09/477/54 43 NW AERO 46 MPH NW RMY 46 TSTM 7/25 82/59/71/-1/0.00/798/94 30 NW AERO 31 MPH WNW RMY 31 7/26 82/67/75/+3/T/.../.. 23 WSW AERO 23 MPH SW RMY 25 7/27 73/66/70/-2/T/.../.. 21 WSW AERO 24 MPH WSW RMY N/A 7/28 morning low temp: 65F; the normal low is now 63F DAILY RECORDS FOR JULY 2012 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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 RECORDS FOR JULY 29 HIGH 97F IN 1949 LOW 53F IN 1888,1914 PRECIP 1.53 INCHES IN 1901 PEAK GUST 40e MPH E IN 1941 TODAY'S REPORT PREPARED BY: Mike Iacono/Peter Volpe