BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 23, 2015 
ALL TIMES ARE IN EASTERN STANDARD TIME

SEVERE THUNDERSTORM WATCH IN EFFECT, POSSIBLE
STRONG STORMS THIS AFTERNOON

Conditions have been ripe for severe weather, with the first
line of showers and storms moving through the region late
this morning. Showers began at the observatory at 11:03 AM EST,
lasting very briefly and leaving just a trace of new rain. Stronger
showers and storms moved north of the city, with a tornado warning
issued for North Shore Massachusetts. 

By the 1:00 PM EST observation sunshine was plentiful- possibly
adding a key ingredient for thunderstorm development later
in the day. Winds had gusted to a peak of 36 MPH so far for 
the day, with a maximum temperature of 81F. 


Today's Observations:
 
7 A.M.
Weather: Scattered altocumulus, broken altocumulus,
broken cirrocumulus, showers distant SW-WSW and NW
Temperature: 72F; Dew Point: 64F; Wind: S at 9 kts
Sea-level pressure: 29.93 ins. Hg, decreasing, then more quickly
Visibility: 20 miles, except 15 miles SW-WSW, thin fog and showers
6-hr Max temp: 72F
6-hr Min temp: 67F
BHO SA 1155 140 SCT E180 BKN 250 BKN 20 134/72/64/1809/993/ 
SHWRS DSNT SW-WSW AND NW VSBY SW-WSW 15 MI THN FG ALQDS/ 
8/059 58014 10072 20067 

10 A.M.
Weather: Scattered altocumulus, broken cirrostratus,
few altocumulus castellanus in all directions
Temperature: 80F; Dew Point: 70F; Wind: S at 18G24 kts
Peak Wind: 31 kts S @ 9:38 AM EST
Sea-level pressure: 29.81 ins. Hg, falling, then more quickly
Visibility: 15 miles, hazy
BHO SA 1455 140 SCT E200 BKN 15 096/80/70/1818G24/981/ 
FEW ACC ALQDS HAZY PK WND 1831/38/ 8/086 58038

1 P.M.
Weather: Scattered altocumulus, broken cirrocumulus, few cumulus
distant WNW-NE
Temperature: 81F; Dew Point: 70F; Wind: S at 15G20 kts
Sea-level pressure: 29.77 ins. Hg, falling, then more slowly
Visibility: 15 miles, hazy
6-hr Max temp: 81F
6-hr Min temp: 71F
6-hr precip: Trace
BHO SA 1755 38 SCT E140 BKN 15 082/81/70/1915G20/977/ 
FEW CU DSNT WNW-NE HAZY/ 8/139 55014 MANUAL 6000/ 10081 20071


SUMMARY FOR MONDAY, JUNE 22, 2015 
  
TEMPERATURE (DEGREES F)
MAX.....83   NORMAL.....77
MIN.....63   NORMAL.....59
MEAN....73   NORMAL.....68
 
DEPARTURE FROM 30-YEAR NORMAL........................+5 
TOTAL DEPARTURE FOR THE MONTH.......................-27 [-1.4 DEGREES/DAY]
 
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0  DEPARTURE...........-1
TOTAL HEATING UNITS FOR THE MONTH..............87  DEPARTURE..........+21 
TOTAL HEATING UNITS FOR THE SEASON...........6491  DEPARTURE.........+122
TOTAL HEATING UNITS LAST SEASON TO DATE......6422  DIFFERENCE.........+69
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............8   DEPARTURE..........+4
TOTAL COOLING UNITS FOR THE MONTH..............60   DEPARTURE..........-4
TOTAL COOLING UNITS FOR THE SEASON............109   DEPARTURE.........+21
TOTAL COOLING UNITS LAST SEASON TO DATE........64   DIFFERENCE........+45
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................20 WNW  AT   4:06 P.M. *                 
                   ASOS........................21 NW   AT   2:08 P.M.
                   DAVIS.......................20 WNW  AT   4:06 P.M. RMY 19
FASTEST MILE FOR YESTERDAY.....................15 NW   AT   4:38 P.M.         
MAXIMUM 2-MINUTE ASOS AVERAGE..................15 NW   AT   4:40 P.M.                
MAXIMUM 2-MINUTE DAVIS AVERAGE.................15 WNW  AT   4:07 P.M.          
AVERAGE WIND SPEED AND DIRECTION..............7.6 WNW
                   ASOS.......................8.4
                   DAVIS......................6.5 WNW [291 deg.] 
* Last of several occurrences...
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00   DEPARTURE....-0.12
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........3.37   DEPARTURE....-0.02 
                         ASOS...............3.39
TOTAL PRECIPITATION FOR THE YEAR.......... 22.74   DEPARTURE....-3.18
                         ASOS...............N/A ***

*** ASOS annual totals not available due to erroneous readings
 
PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

6/1  48/46/47/-15/0.69/000/00              32 NE  RMY 34
6/2  47/44/46/-16/..../000/00              28 NNE RMY 28
6/3  59/44/52/-10/0.00/172/19              16 ESE RMY 16
6/4  63/46/55/-8/0.00/445/49               17 E   RMY 16
6/5  70/49/60/-3/T/500/55                  17 NNE RMY 17
6/6  65/52/59/-4/0.06/382/42               26 ENE RMY 27
6/7  73/49/61/-3/0.00/884/97               28 S   RMY 29
6/8  73/50/62/-2/T/310/34                  41 SSW RMY 48
6/9  76/61/69/+4/0.03/228/25               29 SSW RMY 32  
6/10 82/57/70/+5/0.00/840/92               24 WSW RMY N/A  
6/11 85/61/73/+8/0.00/594/65               29 SSW RMY 32
6/12 86/65/76/+11/..../522/57              26 S   RMY 29 
6/13 83/67/75/+10/T/586/64                 24 N   RMY 27
6/14 75/61/68/+2/0.00/641/70               21 SSE RMY 21
6/15 61/52/57/-9/..../000/00               25 SE  RMY 26
6/16 73/56/65/-1/..../009/01               18 NW  RMY N/A 
6/17 70/57/64/-3/0.00/.../..               28 NE  RMY 28
6/18 76/54/65/-2/0.00/.../..               22 S   RMY 26
6/19 84/60/72/+5/T/.../..                  24 SSW RMY 22
6/20 75/56/66/-2/..../.../..               23 SSE RMY N/A
6/21 76/60/68/0/..../.../..                26 S   RMY 29
6/22 83/63/73/+5/0.00/.../..               20 WNW RMY 19

6/23 low since midnight is 67F; normal low is now 59F
 
DAILY RECORDS FOR JUNE 2015

6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F
surpasses previous record of 51F in 2004
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated): 

RECORDS FOR JUNE 23
HIGH 93F IN 1888
LOW 45F IN 1885
PRECIP 0.70 INS IN 2006
PEAK GUST 63 MPH SE IN 1972 (AGNES)

RECORDS FOR JUNE 24
HIGH 91F IN 1914,1976,2013
LOW 40F IN 1932
PRECIP 2.80 INS IN 1929
PEAK GUST 54 MPH WNW IN 2010

TODAY'S REPORT PREPARED BY: Brian Fitzgerald