BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JULY 19, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME HOT, HOT, HOT, HUMID AND HAZY; TEMPERATURE RECORDS TIED OR SET FOR AN IMPRESSIVE 6 CONSECUTIVE DAYS Today is certainly the hottest day of the year thus far. So far today, the temperature has reached 95F, and will likely equal or surpass the current daily record high of 96F set in 1977 and 1991. Just for comparison, the all-time record high at Blue Hill is 101F set in 1949 and 1975. The day started very warm with a low temperature of only 76F. A new record high minimum temperature will likely be set with such a warm morning low, with the previous record for today being 72F set in 1949, 1991, and 2005. Just for comparison, the all-time record high minimum temperature is 79F. Today will mark the 6th consecutive day in which a record high minimum temperature has been tied or a new one set. An impressive streak to say the least, and certainly a very rare occurrence. Conditions are quite humid once again, with dew point temperatures in the lower 70s. This is producing heat index values over 100F this afternoon, and providing for very hazy conditions. Winds have been rather brisk from the SW-WSW, especially this afternoon. Gusts are frequently reaching 25-30 mph. Today's Observations: 7 A.M. Weather: Scattered dense cirrus, broken thin cirrus, thin smoke layer along horizon and aloft all quadrants, hazy Temperature: 80F; Dew Point: 73F; Wind: WSW at 10 kts. Sea-level pressure: 29.92 ins. Hg, falling slightly Visibility: 20 miles, hazy 6-hr min. temp: 76F BHO SA 1155 220 SCT 250 –BKN 20 131/80/73/2410/992/ THN K LYR ALG HRZN AND ALF ALQDS HAZY/ 8/002 56003 10080 20076 10 A.M. Weather: Scattered dense cirrus, scattered thin cirrus, broken thin cirrus, few altocumulus distant NNW-NNE, dense cirrus WNW-N-ESE, hazy Temperature: 90F; Dew Point: 72F; Wind: SW at 11G19 kts, Wind: Direction variable SSW-W Sea-level pressure: 29.90 ins. Hg, falling Visibility: 30 miles, hazy Heat Index: 98F BHO SA 1455 220 SCT 250 –SCT 300 –BKN 30 124/90/72/2311G19/990/ FEW AC DSNT NNW-NNE DNS CI WNW-N-ESE HAZY WND 20V26 HEAT INDEX 98/ 8/072 58007 1 P.M. Weather: Scattered thin cirrus, few small cumulus and cumulus fractus forming all quadrants, cirrus N-ESE and overhead, hazy Temperature: 94F; Dew Point: 72F; Wind: WSW at 18G26 kts, Wind: Peak wind of 26 kts. from the WSW at 12:49 P.M. EST Wind: Direction variable SSW-W Sea-level pressure: 29.83 ins. Hg, falling Visibility: 30 miles, hazy 6-hr max. temp: 95F Heat Index: 102F BHO SA 1755 250 –SCT 30 102/94/72/2418G26/983/ FEW SML CU/CUFRA FRMG ALQDS CI N-ESE AND OVHD HAZY PK WND 2426/49 WND 21V28 HEAT INDEX 102/ 8/101 58022 10095 20080 WEATHER SUMMARY FOR THURSDAY, JULY 18, 2013 TEMPERATURE (DEGREES F) MAX.....90 NORMAL.....81 MIN.....75 NORMAL.....63 MEAN....83 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.....................+11 TOTAL DEPARTURE FOR THE MONTH.....................+99 [+5.3 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................20 S AT 6:34 P.M. * AERO.....................21 S AT 6:35 P.M. ASOS.....................22 S AT 6:38 P.M. DAVIS....................21 S AT 6-7 P.M. RMY 22 FASTEST MILE FOR YESTERDAY..................15 SSE AT 6:36 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...............15 S AT 6:37 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............14 S AT 6-7 P.M. AVERAGE WIND SPEED AND DIRECTION...........9.6 S ASOS....................9.2 DAVIS...................8.9 SSW [199 deg.] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE............-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.01 DEPARTURE............-1.19 ASOS..............1.00 TOTAL PRECIPITATION FOR THE YEAR..........33.21 DEPARTURE............+4.04 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR JULY 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 7/1 82/69/76/+6/0.05/247/27 29 S AERO 31 MPH SSW RMY 32 7/2 82/61/72/+2/T/100/11 23 SSW AERO 23 MPH SSW RMY 25 7/3 87/62/75/+4/T/556/61 28 SW AERO 30 MPH SW RMY 30 7/4 90/71/81/+10/0.00/811/89 25 WSW AERO 26 MPH SW RMY 28 7/5 92/73/83/+12/0.00/874/96 24 W AERO 25 MPH WSW RMY 25 7/6 90/73/82/+11/0.00/836/92 25 WNW AERO 25 MPH WNW RMY 26 7/7 91/72/82/+11/0.21/508/56 38 SSW AERO 43 MPH SSW RMY 44 TSTM 7/8 82/64/73/+1/0.04/617/68 18 NE AERO 20 MPH NE RMY 20 TSTM 7/9 72/63/68/-4/0.01/054/06 14 ENE AERO 14 MPH ENE RMY 14 7/10 84/65/75/+3/T/335/37 32 S AERO 36 MPH S RMY 35 7/11 79/69/74/+2/0.62/009/01 23 W AERO 23 MPH W RMY N/A TSTM 7/12 70/62/66/-6/0.00/162/18 29 NE AERO 29 MPH NE RMY 30 7/13 75/62/69/-3/0.08/009/01 21 ENE AERO 20 MPH ENE RMY N/A 7/14 89/71/80/+8/0.00/477/53 16 W AERO 16 MPH W RMY 16 7/15 91/72/82/+10/0.00/665/74 17 NW AERO 16 MPH NW RMY 18 7/16 91/71/81/+9/0.00/843/94 18 NNW AERO 16 MPH NNW RMY 16 7/17 93/74/84/+12/0.00/.../.. 22 SW AERO 23 MPH SW RMY 25 7/18 90/75/83/+11/0.00/.../.. 20 S AERO 21 MPH S RMY 22 7/19 morning low temp: 76F; the normal low is now 63F DAILY RECORDS FOR JULY 2013 7/14 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F; ties previous record of 71F set in 1997 7/15 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F; surpasses previous record of 70F set in 1901, 1934, 1995 7/16 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F; ties previous record of 71F set in 1901, 1958, 1968 7/17 - TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F; ties previous record of 74F set in 1900 7/18 - NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F; surpasses previous record of 73F set in 1900 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 19 HIGH 96F IN 1977, 1991 LOW 50F IN 1890 PRECIP 1.10 INS IN 1951 WIND 63 MPH SSW IN 1982 RECORDS FOR JULY 20 HIGH 99F IN 1991 LOW 47F IN 1890 PRECIP 1.64 INS IN 1938 WIND 56e MPH SSW IN 1943 TODAY'S REPORT PREPARED BY: Sean Fankhauser