BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 13, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
OVERCAST SKIES AND HIGH HUMIDITY PROCEED COLD FRONT

Today's skies were filled with stratocumulus and cumulus
clouds threatening rain, but no precipitation was recorded
by 1:00PM EST.  Humidity sharply increased this morning to
60-70% from 20-30% yesterday.

Winds shifted yesterday afternoon from the northeast to
the south. Temperatures were again above normal reaching a 
max of 73F by 1:00PM EST.  


Today's Observations:

7 A.M.
Weather: Few cumulus E, broken stratocumulus
Temperature: 60F; Dew Point: 51F; Wind: estimated SSW at 6 kts
Wind: Light and variable
Sea-level pressure: 29.96 ins. Hg, falling, then rising
Visibility: 35 miles, except 40 miles NNE-ENE, hazy
6-hr Max temp: 60F 
6-hr Min temp: 52F
24-hr precip: 0.00 in.
BHO SA 1155 E33 BKN 35 147/60/51/E2106/996/ FEW CU E VSBY NNE-ENE 40 
HAZY  WND LGT AND VRB/ 8/500 55004 10060 20052

10 A.M.
Weather: Scattered cumulus, overcast stratocumulus
Temperature: 67F; Dew Point: 56F; Wind: SSW at 8 kts
Sea-level pressure: 29.92 ins. Hg, falling, then more slowly
Visibility: 35 miles, hazy
BHO SA 1455 5 SCT E9 OVC 35 132/67/56/2008/992/ HAZY/ 8/5// 56015

1 P.M.
Weather: Broken cumulus, broken stratocumulus
Temperature: 73F; Dew Point: 60F; Wind: SSW at 12G21 kts
Sea-level pressure: 29.83 ins. Hg, falling, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 73F 
6-hr Min temp: 60F
BHO SA 1755 E30 BKN 38 BKN 30 103/73/60/2012G21/983/ HAZY/ 8/5// 
56029 10073 20060

SUMMARY FOR THURSDAY, MAY 12, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....75   NORMAL.....65
MIN.....54   NORMAL.....47 
MEAN....65   NORMAL.....56

DEPARTURE FROM 30-YEAR NORMAL..........................+9
TOTAL DEPARTURE FOR THE MONTH.........................-41 [-3.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE.........-10
TOTAL HEATING UNITS FOR THE MONTH.............168   DEPARTURE.........+35
TOTAL HEATING UNITS FOR THE SEASON...........5160   DEPARTURE.......-1007
TOTAL HEATING UNITS LAST SEASON TO DATE......6324   DIFFERENCE......-1164   

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................23 NNE AT  2:29 A.M.     
                   ASOS........................22 NNE AT  2:30 A.M.  
                   DAVIS.......................22 SSW AT 11:25 P.M.  RMY 23
FASTEST MILE FOR YESTERDAY.....................17 SSW AT 11:18 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE..................17 SSW AT 11:59 P.M
MAXIMUM 2-MINUTE DAVIS AVERAGE.................17 SSW AT 11:17 P.M.  
AVERAGE WIND SPEED AND DIRECTION...............11.0 NE
                   ASOS........................10.9
                   DAVIS.......................10.0 E [080 Deg.]
 

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..........1.67  DEPARTURE......+0.20
                         ASOS..............1.59
TOTAL PRECIPITATION FOR THE YEAR..........18.61  DEPARTURE......-1.41 
                         ASOS.............18.59

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)  
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........0.0
TOTAL SNOWFALL FOR THE MONTH..............TRACE  DEPARTURE........0.0
TOTAL SNOWFALL FOR THE SEASON..............57.5  DEPARTURE.......-5.7

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/ AERO/RMY GUST
AERO: Aerovane wind recording system 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

5/1 52/39/46/-7/0.08/T/000/00               21 S   AERO 22 SE  RMY 20
5/2 50/41/46/-7/0.31/0.0/000/00             20 NE  AERO 21 NE  RMY 18
5/3 48/43/46/-7/0.16/0.0/000/00             16 E   AERO 16 E   RMY 17 
5/4 48/41/45/-9/0.53/0.0/000/00             33 NE  AERO 35 NE  RMY 34
5/5 44/41/43/-11/0.30/0.0/000/00            39 NNE AERO 41 NNE RMY 39
5/6 54/43/49/-5/0.13/0.0/.../..             28 ENE AERO 29 N   RMY 26
5/7 51/43/47/-8/.../0.0/.../..              25 NE  AERO 25 NE  RMY 23
5/8 60/46/53/-2/.../0.0/.../..              47 W   AERO 53 W   RMY 49         
5/9 65/43/54/-1/0.00/0.0/.../..             40 W   AERO 44 W   RMY 40
5/10 69/40/55/0/0.00/0.0/.../..             22 W   AERO 25 WNW RMY 22
5/11 76/50/63/0.00/0.0/.../..               22 WNW AERO 23 WNW*RMY 22
5/12 75/54/65/0.00/0.0/.../..               23 NNE AERO 25 S   RMY 23

5/13 low temp since midnight is 52F; normal low now 47F

* Last of several occurrences
     
DAILY RECORDS FOR MAY 2016

5/1/16: DAILY RECORD SNOWFALL OF A TRACE,
TIES PREVIOUS RECORDS SET IN 1905, 1917, 1921, and 1995

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated): 

RECORDS FOR MAY 13
HIGH 85F IN 1947
LOW 35F IN 1914, 2005
PRECIP 2.39 INCHES IN 2006
PEAK GUST 49 MPH NNW IN 1965

RECORDS FOR MAY 14
HIGH 85F IN 1961
LOW 33F IN 1895
PRECIP 1.93 INCHES IN 2006
PEAK GUST 53 MPH S IN 2009

TODAY'S REPORT PREPARED BY: Cece Borries-Strigle