BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, SEPTEMBER 24, 2011 ALL TIMES ARE IN EASTERN STANDARD TIME 1.05 INCHES OF RAIN RECORDED; VERY WARM CONDITIONS CONTINUE Rain which began yesterday afternoon and became heavy at times overnight has provided 1.05 inches of precipitation. Temperatures are continuing to run well above normal. The morning low of 68F is actually what the average high should be for the date. The high has reached the mid 70s this afternoon, with a very humid feel to the air. Dew point temperatures have been near 70F. It is very likely that today's low of 68F will set a new record high minimum temperature for the date. The current record is 64F set in 1984. With more warm overnight temperatures expected in the next few days, the possibility exists for additional new record high minimum temperatures being set. Today's observations: 7 A.M. Weather: Sky partially obscurred by fog/stratus, broken stratus, overcast stratocumulus, few lower stratus fractus all quadrants, stratus fractus occasionally drifting over summit, thin fog/haze all quadrants Temperature: 69F, Dew point: 68F; Wind: S at 10 kts Sea-level pressure: 30.02 inches Hg, rising Visibility: 20 miles, variable 1/2 mile to 30 miles, ENE 1/2 mile, WNW 30 miles, thin fog/haze all quadrants 24-hour precip: 1.05 inches 6-hour min: 68F BHO SA 1155 –X E3 BKN 30 OVC 20V 165/69/68/1810/002/ F1 FEW LWR STFRA ALQDS STFRA OCNLY DRFTG OVR SMT THN FG/HZ ALQDS VSBY 1/2V30 VSBY ENE 1/2 WNW 30/ 8/8// 53014 MANUAL 70105 ASOS 70104 10069 20068 10 A.M. Weather: Light drizzle, broken stratocumulus, overcast stratocumulus, few stratus fractus all quadrants, breaks in overcast NNE and distant ESE-S and WSW, sun occasionally visible, distant haze, precipitation very light and intermittent Temperature: 72F, Dew Point: 70F; Wind: S at 9 kt Sea-level pressure: 30.06 inches Hg, rising Visibility: 30 miles, light drizzle and distant haze 3-hour precip: Trace BHO SA 1455 E10 BKN 20 OVC 30L- 180/72/70/1709/006/ FEW STFRA ALQDS BINOVC NNE AND DSNT ESE-S AND WSW SUN OCNLY VSBL DSNT HZ PCPN VRY LGT AND INTMT/ 8/5// 51015 MANUAL 6000/ 1 P.M. Weather: Scattered stratocumulus, broken stratocumulus cumulogenitus, broken stratocumulus, broken altocumulus, broken cirrus, cirrus layer partly thin, distant haze Temperature: 76F, Dew Point: 71F; Wind: SW at 6 kts, Wind: Direction variable SSW-W Sea-level pressure: 30.03 inches Hg, falling Visibility: 40 miles, WNW 45 miles, mountain in cloud 45 miles WNW, distant haze 6-hour rainfall: Trace 6-hour max: 76F BHO SA 1755 20 SCT E25 BKN 40 BKN 100 BKN 250 BKN 40 171/76/71/2306/003/ CI LYR PRTLY THN VSBY WNW 45 MTN INCLD 45 WNW DSNT HZ WND 20V27/ 8/841 58009 MANUAL 6000/ 10076 20069 WEATHER SUMMARY FOR FRIDAY, SEPTEMBER 23 TEMPERATURE (DEGREES F) MAX.....73 NORMAL.....69 MIN.....66 NORMAL.....51 MEAN....70 NORMAL.....60 DEPARTURE FROM 30-YEAR NORMAL....................+10 TOTAL DEPARTURE FOR THE MONTH....................+28 [+1.0 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..............18 SE AT 9:35 P.M. * AEROVANE...............28 SE AT 9:35 P.M. ASOS...................20 SSE AT 8:51 P.M. DAVIS..................20 ESE AT 9:34 P.M. RMY N/A THE FASTEST MILE FOR YESTERDAY............14 ESE AT 8:49 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE.............14 SSE AT 9:12 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE............14 ESE AT 8:54 P.M. AVERAGE WIND SPEED AND DIRECTION.........6.7 ESE ASOS..................6.5 DAVIS.................6.4 SSE [157] deg. *last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.05 DEPARTURE.........+0.91 ASOS..............1.04 TOTAL PRECIPITATION FOR THE MONTH..........4.65 DEPARTURE.........+1.50 ASOS..............4.54 TOTAL PRECIPITATION FOR THE YEAR..........42.69 DEPARTURE.........+6.07 ASOS..............43.10** **ASOS data is in error due to system failure on 1/12-13 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2011 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant 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 76/58/67/0/0.00/441/56 17 NE AERO 22 MPH RMY 17 MPH 9/2 71/57/64/-2/0.00/708/90 15 NE AERO 20 MPH RMY N/A 9/3 83/57/70/+4/0.00/619/79 21 SSW AERO 27 MPH RMY 22 MPH 9/4 81/65/73/+7/0.00/266/34 34 S AERO 35 MPH RMY 31 MPH 9/5 83/65/74/+9/0.00/467/60 37 S AERO 44 MPH RMY 40 MPH 9/6 70/56/63/-2/1.10/000/00 36 NNW AERO 45 MPH NNW RMY 40 MPH 9/7 60/56/58/-7/0.62/000/00 29 NE AERO 32 MPH NE RMY 28 MPH 9/8 60/56/58/-7/1.51/000/00 29 ENE AERO 31 MPH ENE RMY 27 MPH 9/9 76/58/67/+3/0.00/506/66 18 NNW AERO 26 MPH NNW RMY 21 MPH 9/10 72/56/64/0/0.00/718/94 18 NNE AERO 25 MPH N RMY 22 MPH 9/11 74/54/64/0/0.00/632/83 18 S AERO 25 MPH S RMY 21 MPH 9/12 80/57/69/+6/0.00/668/88 20 SW AERO 27 MPH SSW RMY 22 MPH 9/13 81/63/72/+9/0.00/627/83 27 S AERO 32 MPH S RMY 26 MPH 9/14 83/65/74/+11/0.02/429/57 24 WSW AERO 31 MPH S RMY 26 MPH TSTM 9/15 80/49/65/+3/0.04/180/24 38 WNW AERO 47 MPH WNW RMY 42 MPH TSTM 9/16 62/43/53/-9/0.00/703/94 28 WNW AERO 35 MPH WNW RMY 27 MPH 9/17 62/43/53/-9/0.00/551/74 17 NNE AERO 24 MPH NNE RMY 18 MPH 9/18 64/49/57/-4/0.00/349/47 25 NE AERO 31 MPH NE RMY 25 MPH 9/19 64/46/55/-6/0.00/658/89 17 SSE AERO 24 MPH SE RMY 21 MPH 9/20 63/52/58/-3/0.14/000/00 23 S AERO 31 MPH S RMY 25 MPH 9/21 77/56/67/+7/0.01/617/84 18 S AERO 24 MPH S RMY 20 MPH 9/22 72/63/68/+8/0.16/.../.. 17 S AERO 24 MPH S RMY 19 MPH 9/23 73/66/70/+10/..../000/00 18 SE AERO 28 MPH SE RMY N/A 9/24 our morning low temp: 68F; the normal low is now 50F DAILY RECORDS FOR SEPTEMBER 2011 9/8 - RECORD DAILY PRECIPITATION OF 1.51 inches; surpasses the previous record of 0.79 inch set in 2004 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 24 HIGH 87F IN 1959 LOW 33F IN 1885,1950,1963 PRECIP 1.19 INCHES IN 1955 PEAK GUST 54e MPH SW IN 1940 RECORDS FOR SEPTEMBER 25 HIGH 87F IN 1970 LOW 31F IN 1950 PRECIP 2.68 INCHES IN 1961 PEAK GUST 63 MPH SSW IN 1991 TODAY'S REPORT PREPARED BY: Sean Fankhauser