BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, AUGUST 19, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME SUNNY AND DRY CONDITIONS TODAY DESPITE CONSIDERABLE HIGH CLOUDINESS This morning was sunny and seasonable with a temperature of 64. The bright sunshine has allowed the temperature to warm to about 79 degrees this afternoon. We should see a high around the low 80s. The day will finish near normal or even slightly below. It will continue our pattern of normal to slightly below for the month of August. Today’s dew points are in the mid 50s with a drying trend since this morning. The dry conditions appear to be in all layers of the atmosphere, noticeable by the cloud patterns. We have mostly sunny conditions with most of the visible clouds being cirrus. The common cumulus clouds are few and far between. There is a visible haze and visibility has been around 25-30 miles. Haze and cirrus clouds are most likely due to the warmer temps and humidity that is moving in for tomorrow. It should break our streak of below to near normal temperatures. Tomorrow could be the first above normal day for August! An interesting note is that we have not had a significant precipitation day since August 9th. The month has had an overall dry pattern and we are only 0.06 inch above normal. Most of all the rain we received came only on one day. Today's Observations: 7 A.M. Weather: Thin scattered cirrus, thin broken cirrus, few patches altocumulus W-N Temperature: 64F; Dew Point: 59F; Wind: W at 8 kts Sea-level pressure: 30.06. ins. Hg, falling slightly Visibility: 20 miles, except 25 miles WNW, hazy all quadrants 6-hr min. temp: 58F 24-hr precip: Trace BHO SA 1155 250 –SCT 300 –BKN 20 179/64/59/2808/006/ PTCHS AC W-N VSBY WNW 25 HAZY ALQDS/ 8/041 58002 10064 20058 10 A.M. Weather: Scattered cirrocumulus,cirrocumulus lenticularis, thin broken cirrus (2 levels), layer of dense cirrus distant WNW-NNE Temperature: 76F; Dew Point: 62F; Wind: W at 6 kts Sea-level pressure: 30.04 ins. Hg, fallling slightly Visibility: 30 miles, hazy BHO SA 1455 220 SCT 250 –BKN 300 –BKN 30 172/76/62/2706/004/ CC/FEW CCSL OVHD-E-S-W LWR DNS CI LYR XTDNG WNW-NNE HAZY/ 8/009 58007 1 P.M. Weather: Broken dense cirrostratus, overcast cirrostratus, few small cumulus mostly distant W-N, few thin spots in overcast overhead-E-ESE Temperature: 81F; Dew Point: 59F; Wind: W at 5 kts, Sea-level pressure: 30.01 ins. Hg, falling then more rapidly Visibility: 30 miles, hazy 6-hr max. temp: 81F BHO SA 1755 E220 BKN 250 OVC 30 162/81/59/2705/001/ FEW SML CU MSTLY DSNT W-N FEW THN SPTS IOVC OVHD-E-ESE/ 8/107 58010 10081 20064 WEATHER SUMMARY FOR SUNDAY, AUGUST 18, 2013 TEMPERATURE (DEGREES F) MAX.....80 NORMAL.....79 MIN.....62 NORMAL.....62 MEAN....71 NORMAL.....71 DEPARTURE FROM 30-YEAR NORMAL........................0 TOTAL DEPARTURE FOR THE MONTH......................-45 [-2.7 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY.............6 DEPARTURE..........0 TOTAL COOLING UNITS FOR THE MONTH............74 DEPARTURE........-47 TOTAL COOLING UNITS FOR THE SEASON..........557 DEPARTURE........+85 TOTAL COOLING UNITS LAST SEASON TO DATE.....633 DIFFERENCE.......-76 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................16 SSW AT 6:22 P.M. * AERO.....................16 SSW AT 6:17 P.M. ASOS.....................16 SSW AT 6:27 P.M. DAVIS....................15 S AT 6-7 P.M. RMY 18 FASTEST MILE FOR YESTERDAY..................13 SSW AT 7:22 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...............13 SSW AT 7:25 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............12 SSW AT 7-8 P.M. AVERAGE WIND SPEED AND DIRECTION...........7.1 SSW ASOS....................6.6 DAVIS...................6.5 SW [220] * last of several occurrences... 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..........2.55 DEPARTURE............+0.06 ASOS..............2.60 TOTAL PRECIPITATION FOR THE YEAR..........37.84 DEPARTURE............+4.36 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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 8/1 81/62/72/0/0.01/503/58 25 S AERO 26 MPH S RMY 27 8/2 81/62/72/0/0.23/518/60 26 W AERO 26 MPH W RMY 28 8/3 77/63/70/-2/T/276/32 22 WSW AERO 23 MPH WSW RMY 23 8/4 79/58/69/-3/T/645/75 25 WNW AERO 21 MPH WNW RMY 26 8/5 75/54/65/-7/0.00/858/100 26 WNW AERO 25 MPH WNW RMY 27 8/6 78/56/67/-5/0.00/846/99 17 ESE AERO 15 MPH S RMY 16 8/7 80/59/70/-2/0.00/759/89 21 S AERO 21 MPH S RMY N/A 8/8 79/62/71/-1/0.08/153/18 25 S AERO 25 MPH S RMY N/A 8/9 73/70/72/0/2.21/000/00 37 S AERO 39 MPH S RMY 40 8/10 81/61/71/-1/0.00/795/94 30 WNW AERO 31 MPH WNW RMY 31 8/11 78/58/68/-3/0.00/835/99 18 W AERO 18 MPH W RMY 21 8/12 81/62/72/+1/0.00/656/78 18 W AERO 17 MPH WSW RMY 19 8/13 73/64/69/-2/0.02/193/23 16 SSE AERO 15 MPH SSE RMY N/A 8/14 73/57/65/-6/0.00/819/98 35 W AERO 35 MPH W RMY 35 8/15 75/53/64/-7/0.00/.../.. 23 W AERO 23 MPH W RMY 24 8/16 77/57/67/-4/0.00/.../.. 20 W AERO 19 MPH W RMY 21 8/17 77/59/68/-3/0.00/.../.. 18 W AERO 18 MPH W RMY N/A 8/18 80/62/71/0/T/.../.. 16 SSW AERO 17 MPH SSW RMY 18 8/19 morning low temp: 58F; the normal low is now 62F DAILY RECORDS FOR AUGUST 2013 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 19 HIGH 90F IN 1906, 1966, 2002 LOW 48F IN 1958 PRECIP 7.02 INCHES IN 1955 [DIANE - RECORD FOR MONTH] PEAK GUST 78 MPH ENE IN 1991 – HURRICANE BOB RECORDS FOR AUGUST 20 HIGH 93F IN 1937 LOW 48F IN 1896, 1905, 1949 PRECIP 2.71 INCHES IN 1970 PEAK GUST 47 MPH W IN 1983 TODAY'S REPORT PREPARED BY: Robert Skilling and Kevin Pecora