BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTSELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MADAILY DISCUSSION AND CLIMATE SUMMARYFRIDAY, AUGUST 23, 2013ALL TIMES ARE IN EASTERN STANDARD TIMEEARLY MORNING COLD FRONT PASSAGE USHERS IN DRIER, COOLER AIR MASSA cold front moved through the area early this morning, switching thewind direction from SW to NW (check out member content at bluehill.orgfor more info). A cooler and drier air mass is invading the regionas a result. The dew point temperature has fallen into the upper 50sthis afternoon, down from the upper 60's of this morning prior to thefrontal passage. The high temperature has only reached the upper 70stoday.Only a rumble of thunder was observed yesterday ahead of the front. Noprecipitation fell on the summit in association with the front. Therelative dry streak continues as a result.Today's Observations:7 A.M. Weather: Scattered altocumulus (3 levels), scattered dense cirrus, brokenthin cirrus, lower altocumulus and a few altocumulus castellanus distantE-S, few altocumulus lenticularis all quadrants, thin smoke layer distantall quadrants, hazyTemperature: 69F; Dew Point: 61F; Wind: NNW at 11G21 kts,Wind: Direction variable WNW-NSea-level pressure: 29.92 ins. Hg, risingVisibility: 45 miles, hazy6-hr min. temp: 67FBHO SA 1155 100 SCT 140 SCT 180 SCT 220 SCT 250 BKN 45132/69/61/3311G21/992 LWR AC AND FEW ACC DSNT E-S FEW ACSL ALQDS THN KLYR DSNT ALQDS HAZY WND 29V36/ 8/082 52024 10069 2006710 A.M. Weather: Scattered cumulus, scattered stratocumulus, scattered altocumulus(2 levels), broken cirrostratus, broken cirrus, few cumulus all quadrants,few stratocumulus lenticularis W-NW, few altocumulus castellanus distantESE-SSE, partial halo, distant haze, thin smoke layer distant S-W-NNETemperature: 72F; Dew Point: 60F; Wind: NNW at 7 kts,Wind: Direction variable WNW-NNESea-level pressure: 29.97 ins. Hg, risingVisibility: 55 miles, distant hazeBHO SA 1455 30 SCT 50 SCT 120 SCT 140 SCT 200 BKN 250 BKN 55149/72/60/3407/997/ FEW CU ALQDS FEW SCSL W-NW FEW ACC DSNT ESE-SSEPARTIAL HALO DSNT HZ THN K LYR DSNT S-W-NNE WND 30V02/ 8/187 530171 P.M.Weather: Scattered cumulus, scattered altocumulus (2 levels), scattereddense cirrus, broken thin cirrus, cumulus and moderate cumulus mostlyS-W-NW, few altocumulus lenticularis ESE-SSE, distant hazeTemperature: 76F; Dew Point: 59F; Wind: ENE at 7 kts,Wind: Direction variable NE-ESESea-level pressure: 29.97 30.12 ins. Hg, rising slightlyVisibility: 65 miles, distant haze6-hr max. temp: 78FBHO SA 1755 40 SCT 100 SCT 120 SCT 220 SCT 250 BKN 65 150/76/59/0707/997CU AND MDT CU MSTLY S-W-NE FEW ACSL DSNT ESE-SSE DSNT HZ WND 04V11/ 8/24253001 10078 20069 WEATHER SUMMARY FOR THURSDAY, AUGUST 22, 2013TEMPERATURE (DEGREES F)MAX.....84 NORMAL.....79MIN.....67 NORMAL.....61MEAN....76 NORMAL.....70 DEPARTURE FROM 30-YEAR NORMAL.......................+6TOTAL DEPARTURE FOR THE MONTH......................-28 [-1.5 DEGREES/DAY]COOLING DEGREE DAYS (SEASON JAN TO DEC)TOTAL COOLING UNITS FOR YESTERDAY.............11 DEPARTURE.........+6TOTAL COOLING UNITS FOR THE MONTH............111 DEPARTURE........-33TOTAL COOLING UNITS FOR THE SEASON...........594 DEPARTURE........+99TOTAL COOLING UNITS LAST SEASON TO DATE......651 DIFFERENCE.......-57PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................22 SW AT 5:33 P.M. AERO.....................22 SSW AT 7:31 P.M. * ASOS.....................23 SSW AT 7:40 P.M. DAVIS....................22 SSW AT 6:21 P.M. RMY: N/AFASTEST MILE FOR YESTERDAY..................17 SSW AT 7:31 P.M. *MAXIMUM 2-MINUTE ASOS AVERAGE...............17 SSW AT 7:49 P.M.MAXIMUM 2-MINUTE DAVIS AVERAGE..............17 SSW AT 7:08 P.M.AVERAGE WIND SPEED AND DIRECTION..........11.6 SW ASOS...................11.2 DAVIS..................10.6 SW [220]* last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.00 DEPARTURE............-0.12 ASOS..............0.00TOTAL PRECIPITATION FOR THE MONTH..........2.55 DEPARTURE............-0.45 ASOS..............2.60TOTAL PRECIPITATION FOR THE YEAR..........37.84 DEPARTURE............+3.85 ASOS..............N/A**ASOS malfunctioned during storm on 2/8-9, leading to erroneous totalsPRELIMINARY CLIMATE SUMMARY FOR AUGUST 2013 CALENDAR DAY DATADATA REPORTED:DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUSTAERO: Aerovane wind recording system gustRMY: 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 finalized8/1 81/62/72/0/0.01/503/58 25 S AERO 26 MPH S RMY 278/2 81/62/72/0/0.23/518/60 26 W AERO 26 MPH W RMY 288/3 77/63/70/-2/T/276/32 22 WSW AERO 23 MPH WSW RMY 238/4 79/58/69/-3/T/645/75 25 WNW AERO 21 MPH WNW RMY 268/5 75/54/65/-7/0.00/858/100 26 WNW AERO 25 MPH WNW RMY 278/6 78/56/67/-5/0.00/846/99 17 ESE AERO 15 MPH S RMY 168/7 80/59/70/-2/0.00/759/89 21 S AERO 21 MPH S RMY N/A8/8 79/62/71/-1/0.08/153/18 25 S AERO 25 MPH S RMY N/A8/9 73/70/72/0/2.21/000/00 37 S AERO 39 MPH S RMY 408/10 81/61/71/-1/0.00/795/94 30 WNW AERO 31 MPH WNW RMY 318/11 78/58/68/-3/0.00/835/99 18 W AERO 18 MPH W RMY 218/12 81/62/72/+1/0.00/656/78 18 W AERO 17 MPH WSW RMY 198/13 73/64/69/-2/0.02/193/23 16 SSE AERO 15 MPH SSE RMY N/A8/14 73/57/65/-6/0.00/819/98 35 W AERO 35 MPH W RMY 358/15 75/53/64/-7/0.00/800/96 23 W AERO 23 MPH W RMY 248/16 77/57/67/-4/0.00/740/89 20 W AERO 19 MPH W RMY 218/17 77/59/68/-3/0.00/770/93 18 W AERO 18 MPH W RMY N/A8/18 80/62/71/0/T/231/28 16 SSW AERO 17 MPH SSW RMY 188/19 82/58/70/0/T/494/60 17 W AERO 18 MPH W RMY 208/20 85/64/75/+5/0.00/772/94 17 NW AERO 18 MPH NW RMY N/A8/21 87/65/76/+6/0.00/802/98 18 WSW AERO 18 MPH WSW RMY 188/22 84/67/76/+6/0.00/.../.. 22 SW AERO 22 MPH SSW RMY N/A8/23 morning low temp: 67F; the normal low is now 61F DAILY RECORDS FOR AUGUST 2013None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, andwind records back to 1940 (e = estimated):RECORDS FOR AUGUST 23HIGH 88F IN 1918, 1947, 1949, 1996LOW 45F IN 1923PRECIP 2.09 INCHES IN 2010PEAK GUST 60e MPH NW IN 1940RECORDS FOR AUGUST 24HIGH 92F IN 1947LOW 43F IN 1971PRECIP 2.40 INCHES IN 2010 PEAK GUST 54 MPH W IN 1986TODAY'S REPORT PREPARED BY: Sean Fankhauser