BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, SEPTEMBER 27, 2012 ALL TIMES ARE IN EASTERN STANDARD TIME 27TH ANNIVERSARY DATA OF HURRICANE GLORIA SUNNY, MILD AND MUCH DRIER TODAY AS DEW POINTS HAVE FALLEN INTO THE MID-40'S Today is September 27th and the 27th anniversary of Hurricane Gloria which was the last hurricane to bring hurricane force wind gusts with a peak of 100 MPH in 1985. The mostly cloudy weather and humid warm weather of yesterday has given way to plenty of bright sunshine and much lower humidity. Dew points were in the lower 60's yesterday but have fallen to the mid-40's early this afternoon. Visibility has risen to 60 to 70 miles with just some distant haze. Today's observations: 7 A.M. Weather: Scattered altocumulus, few altocumulus castellanus overhead, broken cirrus/dense cirrus, mostly clear and clearing W-NE except for patch of stratocumulus forming WSW-NNW, dense cirrus layer NE-SE-SW is receding, thn smoke layer along/above horizon NW and E-SSE, heavy dew on wood, grassy, metal surfaces, thin fog Temperature: 60F; Dew Point: 59F; Wind: NNW at 9 kts, Wind: Direction gradually veering, Wind: Direction variable WNW-N Sea-level pressure: 30.12 ins. Hg, rising then more rapidly Visibility: 15 miles, thin fog all quadrants 6-hour min. temp: 59F 24-hour precip: trace BHO SA 1155 95 SCT 150 SCT E220 BKN 15 199/60/59/3309/012/ MSTLY CLR SKY AND CLRG W-NE XCPT PTCH SC FRMG AND XTNG WSW-NNW FEW NE-E FEW ACC OVHD DNS CI LYR RCDNG NE-SE-SW THN F ALQDS THN K LYR ALG/ABV HRZN NW AND E-SSE HVY DEW WOOD/GRASSY/METAL SFCS WND GRDLY VEERING WND 30V01/ 8/582 53026 10062 20059 10 A.M. Weather: Scattered dense cirrus (layer SE-SW), lone patch of altocumulus lenticularis SSW, cumulus forming distant ESE-S-WSW, few stratocumulus distant SSW-WSW Temperature: 65F; Dew Point: 48F; Wind: NW at 9 kts, Sea-level pressure: 30.18 ins. Hg, rising Visibility: 55 miles, except 70 miles NW, light distant haze BHO SA 1455 220 SCT 55 220/65/48/3209/018/ CU FRMG DSNT ESE-S-WSW FEW SC DSNT SSW-WSW SML LONE PTCH ACSL SSW DNS CI LYR SE-SW VSBY NW 70 LGT DSNT HZ WND 27V36/ 8/842 51021 1 P.M. Weather: Scattered cumulus and stratocumulus cumulogenitus Temperature: 68F; Dew Point: 45F; Wind: NW at 8 kts, Wind: Direction variable W to N Sea-level pressure: 30.15 ins. Hg, falling, then more slowly Visibility: 60 miles, 70 miles NW, distant haze 6-hour max. temp: 69F BHO SA 1755 45 SCT 220 SCT 60 210/68/45/3108/015/ CU/SCCU ALQDS DNS CI LYR DSNT SE-SSE VSBY NW 70 WND 27V01/ 8/102 56010 10069 20060 WEATHER SUMMARY FOR WEDNESDAY, SEPTEMBER 26 TEMPERATURE (DEGREES F) MAX.....70 NORMAL.....68 MIN.....57 NORMAL.....51 MEAN....64 NORMAL.....59 DEPARTURE FROM 30-YEAR NORMAL.....................+5 TOTAL DEPARTURE FOR THE MONTH....................+17 [+0.5 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............1 DEPARTURE........-6 TOTAL HEATING UNITS FOR THE MONTH............64 DEPARTURE.......-23 TOTAL HEATING UNITS FOR THE SEASON...........64 DEPARTURE.......-48 TOTAL HEATING UNITS LAST SEASON TO DATE......75 DIFFERENCE......-11 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............31 S AT 9:08 A.M. AERO..................32 S AT 9:08 A.M. ASOS..................32 S AT 9:08 A.M. DAVIS.................30 S AT 9:07 A.M. RMY 32 THE FASTEST MILE FOR YESTERDAY...........24 S AT 9:16 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE............23 S AT 9:15 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........23 S AT 9:15 A.M. AVERAGE WIND SPEED AND DIRECTION.......15.4 SSW ASOS................14.7 DAVIS...............14.5 SSW [200 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..........2.28 DEPARTURE...........-1.19 ASOS..............2.30 TOTAL PRECIPITATION FOR THE YEAR..........27.63 DEPARTURE..........-10.86 ASOS.............27.56 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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 9/1 75/60/68/0/0.00/637/81 27 ENE AERO 25 MPH ENE RMY 23 9/2 80/60/70/+2/0.00/455/58 21 ENE AERO 20 MPH ENE RMY 20 9/3 76/57/67/0/0.00/485/62 20 SE AERO 20 MPH S RMY 21 9/4 72/62/67/0/0.40/000/00 25 S AERO 23 MPH S RMY N/A 9/5 79/64/72/+5/0.31/171/22 33 SSW AERO 35 MPH SSW RMY 33 9/6 77/62/70/+3/0.00/279/36 20 SSW AERO 20 MPH SSW RMY 19 9/7 85/66/76/+10/0.00/463/60 22 SSW AERO 20 MPH SSW RMY N/A TSTM 9/8 81/62/72/+6/0.38/453/59 45 S AERO 45 MPH S RMY 45 9/9 72/58/65/-1/0.02/283/37 25 WNW AERO 23 MPH WNW RMY N/A 9/10 66/50/58/-7/0.00/313/41 33 NW AERO 32 MPH NW RMY 34 9/11 71/47/59/-6/0.00/714/94 23 NW AERO 21 MPH WNW RMY N/A 9/12 77/53/65/0/0.00/719/95 20 S AERO 18 MPH S RMY 18 9/13 81/59/70/+6/0.00/731/97 21 S AERO 18 MPH S RMY 19 9/14 81/59/70/+6/0.00/706/94 25 S AERO 23 MPH S RMY 23 9/15 72/54/63/-1/0.07/441/59 28 NW AERO 27 MPH WNW RMY 27 9/16 70/49/60/-3/0.00/731/98 23 W AERO 20 MPH W RMY 21 9/17 74/51/63/0/0.00/698/94 20 S AERO 17 MPH S RMY N/A 9/18 74/58/66/+4/0.13/044/06 60 S AERO 62 MPH S RMY 63 9/19 70/53/62/0/0.90/472/64 55 S AERO 56 MPH S RMY N/A 9/20 63/50/57/-5/0.00/539/87 24 NE AERO 21 MPH NE RMY 21 9/21 63/48/56/-5/0.01/241/33 18 E AERO 16 MPH E RMY 16 9/22 70/55/63/+2/0.04/306/42 28 S AERO 25 MPH S RMY 27 9/23 69/50/60/0/0.02/653/90 27 WNW AERO 24 MPH WNW RMY 27 9/24 66/45/56/-4/0.00/694/96 23 WSW AERO 21 MPH WSW RMY 22 9/25 72/48/60/0/0.00/691/96 35 SSW AERP 35 MPH SW RMY 36 9/26 70/57/64/+5/T/050/07 31 S AERO 32 MPH S RMY 32 9/27 morning low temp: 59F; the normal low is now 50F DAILY RECORDS FOR SEPTEMBER 2012 9/19 - NEW RECORD PEAK WIND GUST OF 55 MPH S; surpasses previous record of 49 MPH NE IN 1972 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 27 HIGH 84F IN 1998 LOW 32F IN 1947 PRECIP 2.26 INCHES IN 1962 PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA) RECORDS FOR SEPTEMBER 28 HIGH 82F IN 1959 LOW 33F IN 1897,1947 PRECIP 2.46 INCHES IN 2004 PEAK GUST 69 MPH NE IN 1962 TODAY'S REPORT PREPARED BY: Robert Skilling