BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, SEPTEMBER 30, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME DENSE FOG DISSIPATES EARLY THIS MORNING HIGH THIN CLOUDS INCREASE, BRIGHT SUNSHINE CONTINUES HIGH TEMPERATURES SLIGHTLY BELOW AVERAGE LARGE DARK SMOKE PLUME SEEN TO ENE BY NOON Like yesterday there was dense fog this morning which quickly dissipated leaving us with a beautiful sunny last day of September. Temperatures rose to mid 60's or just slightly below the normal. A large building fire broke in Quincy Center late this morning and the black smoke could still be seen early this afteroon to the ENE. Visibility was reduced to about 10 miles in that direction while the mountains of southern New Hampshire could be seen 60 to 70 miles to the northwest with just some light distant haze. A list of record high early October temperatures is shown here in anticipation of some possible near record warmth later this week. RECORD FOR OCTOBER 2 HIGH 85F IN 1968 RECORD FOR OCTOBER 3 HIGH 82F IN 1922 RECORD FOR OCTOBER 4 HIGH 84F IN 2007 RECORD FOR OCTOBER 5 HIGH 86F IN 2007 Today's Observations: 7 A.M. Weather: Obscurement with heavy fog Temperature: 51F; Dew Point: 51F; Wind: MNE at 2 kts. (estimated) Wind: Light Sea-level pressure: 30.12 ins. Hg, rising slightly Visibility: 1/8 mile, dense fog, occasionally higher 6-hour min. temp: 51F BHO SA 1155 W3 X 1/8F 199/51/51/E0302/012/ VSBY OCNL HIER HVY DEW/CONDENSATION WND LGT/ 8//// 51004 10053 20051 10 A.M. Weather: Scattered stratocumulus, scattered cirrus (SE-S), lower stratus/thin fog along horizon SW-NE-NNE Temperature: 61F; Dew Point: 51F; Wind: NW at 2 kts, (estimated) Wind: Light Sea-level pressure: 30.09 ins. Hg, falling then more slowly Visibility: 15 miles, except 12 miles W-NNE light fog, 25 miles SE-S, light distant haze BHO SA 1455 15 SCT 250 SCT 15 190/61/51/E3102/009/ LWR STRA AND THN F ALG HRZN SW-NW-NNE VSBY W-NNE 12 SE-S 25 DSNT HZ WND LGT/ 8/501 56009 1 P.M. Weather: Few stratocumulus all quadrants except stratocumulus band extending E-S, mostly high thin clouds, (2 layers), cirrus, scattered and broken Temperature: 64F; Dew Point: 46F; Wind: NE at 6 kts, Wind: Light Sea-level pressure: 30.05 ins. Hg, decreasing then more slowly Visibility: 60 miles, except building fire 6 miles northeast by east, large dark smoke plume drifting very slowly S-SW, visibility ENE, 10 miles, E 25 miles, NW 70 miles, light distant haze 6-hour max. temp: 64F BHO SA 1755 250 –SCT 300 –BKN 60 177/64/46/0506/005/ FEW SC ALQDS XCPT SC BND MSTLY DSNT E-S BLDG FIRE 6 MI NE X E LGE DRK K PLUME ENE DRFTG VRY SLOWLY S-SW VSBY ENE 10 E 25 NW 70 LGT DSNT HZ WND LGT/ 8/501 56013 10064 20051 WEATHER SUMMARY FOR SUNDAY, SEPTEMBER 29, 2013 TEMPERATURE (DEGREES F) MAX.....65 NORMAL.....67 MIN.....50 NORMAL.....49 MEAN....58 NORMAL.....58 DEPARTURE FROM 30-YEAR NORMAL......................0 TOTAL DEPARTURE FOR THE MONTH....................-25 [-1.1 DEGREE/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY..............0 DEPARTURE.........-1 TOTAL COOLING UNITS FOR THE MONTH.............56 DEPARTURE.........-3 TOTAL COOLING UNITS FOR THE SEASON...........696 DEPARTURE.......+100 TOTAL COOLING UNITS LAST SEASON TO DATE......765 DIFFERENCE.......-69 HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............7 DEPARTURE.........-3 TOTAL HEATING UNITS FOR THE MONTH............128 DEPARTURE........+19 TOTAL HEATING UNITS FOR THE SEASON...........140 DEPARTURE.........+6 TOTAL HEATING UNITS LAST SEASON TO DATE.......88 DIFFERENCE.......+52 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................15 ESE AT 8:06 P.M. * AERO.......................15 ESE AT 7:53 P.M. * ASOS.......................15 ESE AT 8:06 P.M. DAVIS......................15 ESE AT 7:42 P.M. RMY 15 FASTEST MILE FOR YESTERDAY....................12 ESE AT 8:14 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.................13 ESE AT 8:08 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE................12 E AT 8:01 P.M. AVERAGE WIND SPEED AND DIRECTION.............6.5 ASOS......................6.7 DAVIS.....................6.0 E (080 degrees] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.............-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........3.91 DEPARTURE.............+0.00 ASOS..............4.04 TOTAL PRECIPITATION FOR THE YEAR..........41.92 DEPARTURE.............+2.99 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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 9/1 76/67/72/+4/2.32/008/01 33 S AERO 39 MPH S RMY 38 TSTM 9/2 79/67/73/+5/0.43/056/07 30 SSE AERO 33 MPH SSE RMY N/A TSTM 9/3 79/61/70/+3/0.00/219/28 28 S AERO 29 MPH S RMY 30 TSTM 9/4 78/57/68/+1/0.00/733/94 24 W AERO 25 MPH W RMY 25 9/5 66/51/59/-8/0.08/179/23 20 NNE AERO 20 MPH NNE RMY 21 9/6 68/46/57/-10/0.00/751/97 18 WSW AERO 17 MPH WSW RMY N/A 9/7 78/51/65/-1/0.00/594/77 20 WSW AERO 21 MPH WSW RMY 21 9/8 74/50/62/-4/0.00/646/84 31 NW AERO 33 MPH NW RMY 32 9/9 69/47/58/-8/T/529/69 23 SW AERO 23 MPH SSW RMY N/A 9/10 73/56/65/0/0.03/007/01 30 S AERO 32 MPH S RMY 33 9/11 93/68/81/+16/0.00/654/86 25 SW AERO 27 MPH SW RMY N/A 9/12 85/66/76/+11/0.47/455/60 32 S AERO 33 MPH S RMY 34 TSTM 9/13 79/58/69/+5/0.17/242/32 24 NNW AERO 25 MPH NNW RMY 23 9/14 67/52/60/-4/0.00/361/48 21 NW AERO 21 MPH NW RMY 21 9/15 70/48/59/-5/0.00/547/73 17 WSW AERO 18 MPH WSW RMY 20 9/16 66/46/56/-7/0.02/179/24 29 NNW AERO 31 MPH NNW RMY 30 9/17 60/40/50/-13/0.00/722/97 27 NNE AERO 27 MPH NNE RMY 26 9/18 73/47/60/-2/0.00/726/98 18 W AERO 18 MPH WSW RMY 20 9/19 78/51/65/+3/0.00/731/99 17 WSW AERO 16 MPH WSW RMY 18 9/20 78/54/66/+4/0.00/706/96 18 SSW AERO 18 MPH SSW RMY 23 9/21 74/57/66/+4/T/512/70 35 S AERO 40 MPH S RMY N/A 9/22 70/49/60/-1/0.39/365/50 38 S AERO 39 MPH S RMY 42 9/23 63/43/53/-7/0.00/711/98 25 NW AERO 26 MPH NW RMY 28 9/24 65/40/53/-7/0.00/702/97 22 ENE AERO 22 MPH ENE RMY 23 9/25 64/45/55/-5/0.00/512/71 18 N AERO 18 MPH N RMY 19 9/26 63/52/58/-1/0.00/.../.. 16 ENE AERO 14 MPH ENE RMY 16 9/27 64/52/58/-1/0.00/.../.. 21 NE AERO 20 MPH NE RMY 20 9/28 70/52/61/+3/0.00/.../.. 16 NNE AERO 15 MPH NNE RMY 15 9/29 65/50/58/0/0.00/.../.. 15 ESE AERO 15 MPH ESE RMY 15 9/30 our morning low temp: 51F; the normal low is now 49F DAILY RECORDS FOR SEPTEMBER 2013 9/1 - NEW DAILY RECORD MAXIMUM PRECIPITATION OF 2.32 INCHES; surpasses previous record of 1.60 inches set in 1927 9/11 - TIED DAILY RECORD MAXIMUM HIGH TEMPERATURE OF 93F; ties record of 93F set in 1983 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 30 HIGH 84F IN 1986 LOW 31F IN 1992 PRECIP 1.93 INCHES IN 1946 PEAK GUST 58 MPH SSE IN 1999 RECORDS FOR OCTOBER 1 HIGH 85F IN 1927 LOW 30F IN 1992 PRECIP 1.44 INCHES IN 1984 PEAK GUST 68e MPH SSE IN 1977 TODAY'S REPORT PREPARED BY: Robert Skilling