BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, MAY 28, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME WARMING UP; HIGH CLOUDS ON THE INCREASE After a chilly Memorial Day weekend, temperatures are finally warming back up above normal. With a low of 55F and a high in the mid 70s, the average daily temperature looks to finish close to 5 degrees above the 30-year normal for the date. Clouds have been increasing today from the SW. Cirrus and cirrostratus clouds are filling most of the sky this afternoon. The cirrostratus has been evidenced by a halo that has been visible around the sun for much of the day. Winds have been quite low today, especially in contrast to the windy conditions over the holiday weekend. With the anticipation of hot temperatures later this week, below are the current records at Blue Hill: May 30 93F in 1929 May 31 92F in 1944, 1987 June 1 90F in 1937 Today's observations: 7 A.M. Weather: Scattered cirrostratus, scattered thin cirrus, few altocumulus lenticularis SSE, cirrostratus SSE-W invading the sky, inversion present, smoke layer along horizon all quadrants, dark smoke layer along horizon NNW-NNE Temperature: 61F; Dew Point: 42F; Wind: E at 5 kts. Wind: Light and variable Sea-level pressure: 30.24 ins. Hg, rising Visibility: 70 miles, NW 80 miles above inversion 6-hr min. temp: 55F BHO SA 1155 200 SCT 250 –SCT 70 240/61/42/0805/024/ FEW ACSL SSE CS SSE-W INVADING INVSN PRSNT K LYR ALG HRZN ALQDS DRK K LYR ALG HRZN NNW-NNE VSBY NW 80 ABV INVSN WND LGT AND VRB/ 8/045 51014 10061 20055 10 A.M. Weather: Broken cirrostratus, broken cirrus, lone altocumulus lenticularis distant S, halo, thin smoke layer distant NNW-NNE, light distant haze Temperature: 68F; Dew Point: 42F; Wind: SE at 5 kts, Wind: Light and variable Sea-level pressure: 30.25 ins. Hg, rising slightly Visibility: 70 miles, light distant haze BHO SA 1455 E200 BKN 250 BKN 70 243/68/42/1305/025/ LONE ACSL DSNT S HALO THN K LYR DSNT NNW-NNE LGT DSNT HZ WND LGT AND VRB/ 8/047 52003 1 P.M. Weather: Broken cirrostratus, broken cirrus, few small cumulus distant SE-SSE and distant SW, cirrocumulus extending SE-overhead, partial halo, light distant haze Temperature: 73F; Dew Point: 42F; Wind: WSW at 5 kts, Wind: Light and variable Sea-level pressure: 30.22 ins. Hg, falling Visibility: 65 miles, light distant haze 6-hour max temp: 74F BHO SA 1755 E200 BKN 250 BKN 65 233/73/42/2405/022/ FEW SML CU DSNT SE-SSE AND DSNT SW CC XTNDNG SE-OVHD PARTIAL HALO LGT DSNT HZ WND LGT AND VRB/ 8/109 58010 10074 20061 WEATHER SUMMARY FOR MONDAY, MAY 27, 2013 TEMPERATURE (DEGREES F) MAX.....70 NORMAL.....69 MIN.....41 NORMAL.....51 MEAN....56 NORMAL.....60 DEPARTURE FROM 30-YEAR NORMAL....................-4 TOTAL DEPARTURE FOR THE MONTH...................+23 [+0.7 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............9 DEPARTURE..........+3 TOTAL HEATING UNITS FOR THE MONTH...........211 DEPARTURE.........-35 TOTAL HEATING UNITS FOR THE SEASON.........5733 DEPARTURE........-548 TOTAL HEATING UNITS LAST SEASON TO DATE....4888 DIFFERENCE.......+845 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...............33 WNW AT 10:31 A.M. AERO....................33 WNW AT 10:31 A.M. ASOS....................35 WNW AT 10:31 A.M. DAVIS...................34 WNW AT 10:31 A.M. RMY: 36 FASTEST MILE FOR YESTERDAY.................24 WNW AT 10:23 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE..............22 NW AT 10:40 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.............21 WNW AT 10:24 A.M. AVERAGE WIND SPEED AND DIRECTION.........12.7 W ASOS..................13.2 DAVIS.................11.2 W [277 deg] 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..........2.54 DEPARTURE...........-0.97 TOTAL ASOS PRECIPITATION FOR MONTH.........2.46 TOTAL PRECIPITATION FOR THE YEAR..........18.92 DEPARTURE...........-3.14 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........0.0 DEPARTURE.............0.0 TOTAL SNOWFALL FOR THE MONTH...............0.0 DEPARTURE.............0.0 TOTAL SNOWFALL FOR THE SEASON.............99.0 DEPARTURE...........+36.3 PRELIMINARY CLIMATE SUMMARY FOR MAY 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 5/1 67/45/56/+3/0.00/845/100 18 E AERO 16 MPH E RMY 17 5/2 75/43/59/+6/T/669/79 29 NE AERO 26 MPH NE RMY 29 5/3 54/42/48/-5/0.00/706/83 24 NE AERO 25 MPH NE RMY 28 5/4 55/40/48/-6/0.00/843/99 21 NE AERO 23 MPH NE RMY 23 5/5 58/37/48/-6/0.00/752/88 17 ENE AERO 17 MPH ENE RMY 20 5/6 66/40/53/-1/0.00/600/70 17 S AERO 18 MPH S RMY 20 5/7 77/50/64/+9/0.00/807/94 21 S AERO 23 MPH S RMY 25 5/8 71/55/63/+8/0.42/112/13 31 SSE AERO 35 MPH SSE RMY 35 TSTM 5/9 66/56/61/+6/0.41/078/09 16 NE AERO 16 MPH NE RMY 18 TSTM 5/10 79/54/67/+12/T/333/63 18 S AERO 21 MPH S RMY N/A 5/11 70/56/63/+7/0.06/026/03 43 SSW AERO 44 MPH SSW RMY 46 5/12 71/47/59/+3/0.05/339/39 30 W AERO 32 MPH W RMY 32 5/13 60/41/51/-5/0.00/821/94 25 WSW AERO 28 MPH WSW RMY 30 5/14 58/38/48/-9/T/385/44 22 W AERO 24 MPH W RMY 25 5/15 65/41/53/-4/0.02/456/52 35 S AERO 38 MPH S RMY 40 5/16 80/51/66/+9/0.00/844/96 40 W AERO 45 MPH W RMY 42 5/17 69/50/60/+3/0.00/872/99 24 NW AERO 28 MPH NW RMY 27 5/18 73/47/60/+2/0.00/689/78 21 SE AERO 24 MPH SE RMY 24 5/19 71/50/61/+3/0.11/407/46 21 S AERO 23 MPH S RMY 24 5/20 81/54/68/+10/0.01/496/56 21 S AERO 21 MPH S RMY N/A 5/21 81/49/65/+6/0.14/506/57 29 NE AERO 31 MPH NE RMY 32 TSTM 5/22 66/48/57/-3/0.04/009/01 27 WNW AERO 25 MPH WNW RMY N/A 5/23 74/53/64/+5/0.09/036/04 35 S AERO 39 MPH S RMY 40 5/24 68/49/59/0/0.57/000/00 33 S AERO 35 MPH S RMY N/A 5/25 50/39/45/-15/0.59/000/00 32 NW AERO 35 MPH NW RMY 32 5/26 58/37/48/-12/0.03/.../.. 44 NW AERO 44 MPH NW RMY 45 5/27 70/41/56/-4/0.00/.../.. 33 WNW AERO 33 MPH WNW RMY 36 5/28 morning low temp: 55F; the normal low is now 51F DAILY RECORDS FOR MAY 2013 5/26- TIED DAILY RECORD MINIMUM TEMPERATURE OF 37F; record of 37F set in 1972. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 28 HIGH 90F IN 1929 LOW 39F IN 1917 PRECIP 2.48 INS 1906 PEAK GUST 51e MPH NE IN 1946 RECORDS FOR MAY 29 HIGH 93F IN 1919 LOW 35F IN 1902 PRECIP 1.63 INS 1990 PEAK GUST 55e MPH NNW IN 1943, WNW IN 1945 TODAY'S REPORT PREPARED BY: Sean Fankhauser