BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 28, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

THUNDERSTORMS MISS THE SUMMIT ONCE AGAIN, TRACE OF 
RAIN YESTERDAY AFTERNOON, HEAT AND HUMIDITY SOAR TODAY 

Three strong but isolated thunderstorms visible from the
observatory tower yesterday afternoon trudged slowly to the
E; however, only a trace of rain fell from one storm that skimmed
the city. Another day without measurable precipitation has
added to the monthly and annual deficit, which stand at
-0.43 inches and -3.13 inches respectively.

Fog this morning slowly burned off to reveal hot and humid
conditions. By the 1:00 PM EST observation scattered cumulus
had begun growing rapidly with moderate and towering cumulus 
in all directions. Temperatures had risen a maximum of 89F
by 1:00 PM EST as well.

 
Today's Observations:
 
7 A.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 71F; Dew Point: 68F; Wind: WSW at 7 kts
Sea-level pressure: 30.01 ins. Hg, rising, then falling, but higher
Visibility: 9 miles, thin fog in all directions 
6-hr Max temp: 71F
6-hr Min temp: 68F
24-hr precip: Trace
BHO SA 1155 E3 BKN 130 BKN 9 163/71/68/2407/001/ 
THN FG ALQDS/ 8/530 50002 10071 20068

10 A.M.
Weather: Scattered stratocumulus
Temperature: 80F; Dew Point 70F; Wind: estimated WSW at 3 kts
Wind Speed and Direction: Light and Variable
Sea-level pressure: 30.00 ins. Hg, falling, then more slowly
Visibility: 20 miles, hazy 
BHO SA 1455 20 SCT 20 158/80/70/E2403/000/ 
HAZY WND LGT AND VRB/ 8/500 56005 

1 P.M.
Weather: Scattered cumulus, scattered cirrus,
moderate and towering cumulus in all directions
Temperature: 89F; Dew Point: 68F; Wind: estimated N at 3 kts,
Wind Speed: Light
Sea-level pressure: 29.97 ins. Hg, falling, then more quickly
Visibility: 20 miles, hazy  
6-hr Max temp: 89F  
6-hr Min temp: 71F  
BHO SA 1755 60 SCT 250 SCT 20 148/89/68/E3503/997/ 
MDT CU AND TCU ALQDS HAZY WND LGT/ 8/201 58010 10089 20071


SUMMARY FOR MONDAY, JULY 27, 2015 
  
TEMPERATURE (DEGREES F)
MAX.....84   NORMAL.....81
MIN.....67   NORMAL.....63
MEAN....76   NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL........................+4
TOTAL DEPARTURE FOR THE MONTH.......................+16 [+0.4 DEGREES/DAY]
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............11   DEPARTURE..........+3
TOTAL COOLING UNITS FOR THE MONTH.............197   DEPARTURE..........+4
TOTAL COOLING UNITS FOR THE SEASON............335   DEPARTURE.........+13
TOTAL COOLING UNITS LAST SEASON TO DATE.......315   DIFFERENCE........+20
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................24  S   AT 11:14 A.M.    
                   ASOS........................25  S   AT 11:02 A.M. 
                   DAVIS.......................25  S   AT 11:14 A.M. RMY N/A 
FASTEST MILE FOR YESTERDAY.....................20  S   AT 11:13 A.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE..................21  SSW AT 11:16 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................19  S   AT 11:16 A.M.  
AVERAGE WIND SPEED AND DIRECTION...............11.8 S 
                   ASOS........................12.1
                   DAVIS.......................10.1 S [186 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...........2.99  DEPARTURE.....-0.43
                         ASOS...............3.01
TOTAL PRECIPITATION FOR THE YEAR...........27.26  DEPARTURE.....-3.13
                        ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings
 

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/1  80/63/72/+2/0.59/466/51               30 SSE RMY 33  TSTM
7/2  78/60/69/-1/0.00/721/79               23 WNW RMY N/A
7/3  79/58/69/-2/0.00/867/95               17 SSW RMY 17 
7/4  74/61/68/-3/T/109/12                  16 S   RMY N/A
7/5  82/58/70/-1/0.00/865/95               20 WSW RMY 20  
7/6  85/64/75/+4/0.00/755/83               20 S   RMY 21
7/7  84/65/75/+4/0.02/445/49               35 S   RMY 40
7/8  87/68/78/+6/T/372/41                  23 NE  RMY N/A
7/9  73/61/67/-5/..../390/43               24 NE  RMY 25
7/10 80/59/70/-2/..../535/59               18 W   RMY N/A TSTM
7/11 84/61/73/+1/0.00/868/96               21 NW  RMY 19
7/12 88/67/78/+6/0.00/813/90               20 W   RMY 17
7/13 82/66/74/+2/0.00/424/47               21 E   RMY 20
7/14 81/64/73/+1/..../396/44               25 S   RMY 27 
7/15 84/61/73/+1/..../.../..               24 ENE RMY 26
7/16 72/56/64/-8/0.00/.../..               25 NNE RMY 24 
7/17 79/56/68/-4/0.00/.../..               21 S   RMY N/A 
7/18 76/63/70/-2/0.16/.../..               29 SSW RMY 30  TSTM
7/19 89/68/79/+7/0.01/.../..               25 SSW RMY 27
7/20 90/73/82/+10/0.00/.../..              24 W   RMY 26
7/21 87/70/79/+7/T/.../..                  24 W   RMY 25
7/22 82/64/73/+1/T/.../..                  24 WNW RMY 26
7/23 81/62/72/+0/0.00/.../..               22 W   RMY 23
7/24 80/60/70/-2/T/.../..                  23 N   RMY 25
7/25 71/59/65/-7/0.00/.../..               20 ENE RMY N/A  
7/26 78/59/69/-3/T/.../..                  24 SSE RMY 25  TSTM
7/27 84/67/76/+4/T/.../..                  24 S   RMY N/A TSTM

7/28 low since midnight is 68F; normal low is now 63F
 
DAILY RECORDS FOR JULY 2015

7/10- NEW RECORD DAILY PRECIPITATION PENDING OF X.XX in 2015
surpasses previous record of 1.68 in. in 1933
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated): 

RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006

RECORDS FOR JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941

TODAY'S REPORT PREPARED BY: Brian Fitzgerald