BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, OCTOBER 23, 2012 ALL TIMES ARE IN EASTERN STANDARD TIME CLOUDS GRADUALLY OVERTAKING THE SKY TODAY; CONTINUED WARM Mid and high level clouds have gradually been overtaking the sky today as a disturbance slides just south and west of our area. Temperatures today are continuing the recent warm trend, likely averaging several degrees above the 30-year normal by the end of the day. The month of October is now running about 2 degrees above normal. Conditions have become fairly calm this afternoon with light winds of less than 10 mph generally from the WNW. The month remains dry with only 39% of our normal rainfall to date. The rainfall deficit for the year has grown to over 12 inches. Today's observations: 7 A.M. Weather: Broken dense cirrus, broken cirrus, few altocumulus and altocumulus lenticularis distant SSW-N, dense cirrus SW-NW-NE-E, higher cirrus layer partly thin, inversion present, thin smoke layer distant all quadrants, distant haze Temperature: 48; Dew Point: 41F; Wind: NW at 15 kts. Sea-level pressure: 30.08 ins. Hg, rising Visibility: 65 miles, distant haze 6-hour min. temp: 46F BHO SA 1155 E220 BKN 250 BKN 65 185/48/41/3115/008/ FEW AC/ACSL DSNT SSW-N DNS CI SW-NW-NE-E HIER CI LYR PRTLY THN INVSN PRSNT THN K LYR DSNT ALQDS DSNT HZ/ 8/042 53014 10049 20046 10 A.M. Weather: Scattered altocumulus, scattered cirrostratus, scattered dense cirrus, broken thin cirrus, altocumulus and altocumulus lenticularis distant SW-WNW, mostly clear sky ESE-SSE, thin smoke layer distant NW-E, distant haze Temperature: 58F; Dew Point: 41F; Wind: NW at 13GG20 kts, Wind: Direction variable W to N Sea-level pressure: 30.10 ins. Hg, rising Visibility: 65 miles, distant haze BHO SA 1455 100 SCT 200 SCT 220 SCT 250 –BKN 65 193/58/41/3213G20/010/ AC/ACSL DSNT SW-WNW MSTLY CLR SKY ESE-SSE THN K LYR DSNT NW-E DSNT HZ WND 27V36/ 8/047 50008 1 P.M. Weather: Scattered altocumulus, scattered altostratus, broken cirrostratus, broken dense cirrus, broken thin cirrus, few lower altocumulus lenticularis distant SSW-NW, higher altocumulus NE-E and distant SSE-NW, partial halo, distant haze, rain shower distant SSW-W moving SE Temperature: 63F; Dew Point: 42F; Wind: WNW at 5 kts, Wind: Light and variable Sea-level pressure: 30.06 ins. Hg, falling Visibility: 65 miles, distant haze BHO SA 1755 100 SCT 180 SCT E200 BKN 220 BKN 250 BKN 65 180/63/42/3005/006/ FEW LWR ACSL DSNT SSW-NW HIER AC NE-E AND DSNT SSE-NW PARTIAL HALO DSNT HZ SHRA DSNT SSW-W MOVG SE WND LGT AND VRB/ 8/077 58013 10063 20048 WEATHER SUMMARY FOR MONDAY, OCTOBER 22 TEMPERATURE (DEGREES F) MAX.....65 NORMAL.....58 MIN.....46 NORMAL.....41 MEAN....56 NORMAL.....49 DEPARTURE FROM 30-YEAR NORMAL.....................+7 TOTAL DEPARTURE FOR THE MONTH....................+46 [+1.9 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............9 DEPARTURE........-7 TOTAL HEATING UNITS FOR THE MONTH...........217 DEPARTURE.......-50 TOTAL HEATING UNITS FOR THE SEASON..........316 DEPARTURE.......-93 TOTAL HEATING UNITS LAST SEASON TO DATE.....226 DIFFERENCE......+90 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............37 WNW AT 10:00 A.M. AERO..................35 WNW AT 9:53 A.M. ASOS..................35 WNW AT 10:00 A.M. DAVIS.................36 WNW AT 10:00 A.M. RMY 36 THE FASTEST MILE FOR YESTERDAY...........26 WNW AT 9:36 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE............24 WNW AT 9:36 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........22 WNW AT 10:03 A.M. AVERAGE WIND SPEED AND DIRECTION.......15.2 W ASOS................15.0 DAVIS...............13.3 W [278 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE...........-0.16 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.29 DEPARTURE...........-2.00 ASOS..............1.23 TOTAL PRECIPITATION FOR THE YEAR..........29.91 DEPARTURE..........-12.46 ASOS.............29.78 PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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 10/1 66/47/57/0/T/429/61 36 W AERO 35 MPH WSW RMY 36 10/2 69/53/61/+4/0.12/098/14 18 W AERO 16 MPH W RNT 16 10/3 62/58/60/+4/0.02/000/00 20 NE AERO 18 MPH NE RMY 18 10/4 61/58/60/+4/0.08/000/00 17 NNE AERO 14 MPH NE RMY 14 10/5 75/57/66/+10/0.00/623/90 20 SW AERO 19 MPH SW RMY 21 10/6 77/48/63/+8/0.20/269/39 36 SSW AERO 37 MPH SSW RMY 36 TSTM 10/7 57/44/51/-4/0.15/185/27 21 WNW AERO 18 MPH WNW RMY 19 10/8 55/40/48/-6/0.00/328/48 17 WNW AERO 15 MPH WNW RMY N/A 10/9 56/49/53/-1/T/000/00 27 E AERO 25 MPH ENE RMY 25 10/10 60/47/54/0/0.22/000/00 36 WNW AERO 36 MPH WNW RMY 31 10/11 58/41/50/-3/0.00/668/99 35 WNW AERO 33 MPH WNW RMY 34 10/12 51/34/43/-10/0.04/296/44 32 WNW AERO 30 MPH NW RMY 30 10/13 52/29/41/-12/0.00/582/87 22 SSW AERO 20 MPH WNW RMY N/A 10/14 66/43/55/+3/0.09/167/25 40 SW AERO 39 MPH SW RMY 39 10/15 73/58/66/+14/0.03/279/42 43 SSW AERO 43 MPH SSW RMY 43 10/16 61/40/51/0/0.03/522/79 38 WNW AERO 36 MPH WNW RMY 38 10/17 60/35/48/-3/0.00/612/93 22 NW AERO 18 MPH NW RMY N/A 10/18 66/46/56/+5/0.00/.../.. 25 ESE AERO 23 MPH ESE RMY 25 10/19 66/51/59/+9/0.20/007/01 39 SSE AERO 38 MPH SSE RMY 39 10/20 73/53/63/+13/0.11/377/58 33 SSW AERO 32 MPH SSW RMY 34 TSTM 10/21 63/45/54/+4/0.00/564/87 36 WNW AERO 32 MPH WNW RMY 34 10/22 65/46/56/+7/0.00/.../.. 37 WNW AERO 35 MPH WNW RMY 36 10/23 morning low temp: 46F; the normal low is now 40F DAILY RECORDS FOR OCTOBER 2012 10/13 - NEW DAILY RECORD LOW MINIMUM TEMPERATURE OF 29F; surpasses previous record of 30F set in 1934, 1936, 1988 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 23 HIGH 82F IN 1947 LOW 24F IN 1969 PRECIP 2.18 INCHES IN 1956 SNOWFALL 3.0 INCHES IN 1891 PEAK GUST 78e MPH NW IN 1941 RECORDS FOR OCTOBER 24 HIGH 79F IN 1963 LOW 22F IN 1969 PRECIP 2.96 INCHES IN 1890 SNOWFALL 1.8 INCHES IN 1960 PEAK GUST 70 MPH SE IN 1959 TODAY'S REPORT PREPARED BY: Sean Fankhauser