BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 26, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
CLEAR, BEAUTIFUL SPRING DAY ON SUMMIT
MID AFTERNOON CLOUDS
 
Today was a gorgeous spring day here on the summit with mostly
clear skies. Temperatures quickly rose into the mid 50s after
starting the morning off with a low of 44F. However, with winds
coming from the east and off the water, temperatures were unable
to reach 60, with a high of 58F. Diurnal cumulus clouds began popping
by early afternoon and have since developed into moderate cumulus
by mid afternoon with the aid of our prevalent easterly wind.
 
Visibility has been fair today despite a persistent haze that has
remained throughout the day. Grand Monadnock out to the NW was just
barely visible.
 
The average monthly temperature continues to remain about a degree
above normal, and is expected to remain this way through the end
of the month.
 
Today's observations:
 
7 A.M.
Weather: Clear, with few altocumulus cumulogenitus distant NE-SE,
lone cirrus uncinus distant E, light distant haze
Temperature: 49F; Dew Point: 32F; Wind: ENE at 13 kts,
Wind: Direction variable N-E
Sea-level pressure: 30.38 ins. Hg, rising then more slowly
Visibility: 60 miles, light distant haze
6-hour min. temp: 44F
BHO SA 1155 CLR 60 287/49/32/0613/038/ FEW ACCU DSNT NE-SE LONE
CI DSNT E LGT DSNT HZ WND 36V09/ 8/061 51024 10049 20044
 
10 A.M. 
Weather: Clear, with few faint thin cirrus distant all quadrants,
few faint altocumulus standing lenticularis distant NNW-N, light
distant haze
Temperature: 56F; Dew Point: 35F; Wind: ENE at 9 kts,
Wind: Direction variable NE-ESE
Sea-level pressure: 30.41 ins. Hg, rising then more slowly 
Visibility: 60 miles, light distant haze
BHO SA 1455 CLR 60 298/56/35/0709/041/ FEW FAINT THN CI DSNT ALQDS
FEW FAINT ACSL DSNT NNW-N LGT DSNT HZ WND 04V11/ 8/041 51011
 
1 P.M. 
Weather: Scattered cumulus, few moderate cumulus SE-SW-NW and overhead,
cumulus band distant offshore NE-E, light distant haze
Temperature: 52F; Dew Point: 38F; Wind: NE at 12 kts,
Wind: Direction variable NNE-E
Sea-level pressure: 30.37 ins. Hg, falling  
Visibility: 60 miles, light distant haze
6-hour max. temp: 58F
BHO SA 1755 50 SCT 286/52/38/0512/037/ FEW MDT CU SE-SW-NW AND OVD CU
BAND DSNT OFFSHR NE-E LGT DSNT HZ WND 02V09/ 8/200 58012 10058 20049
 
 
WEATHER SUMMARY FOR THURSDAY, APRIL 25
 
TEMPERATURE (DEGREES F)
MAX.....64     NORMAL.....60
MIN.....44     NORMAL.....41                         
MEAN....54     NORMAL.....50             
 
DEPARTURE FROM 30-YEAR NORMAL....................+4
TOTAL DEPARTURE FOR THE MONTH...................+30 [+1.0 DEGREES/DAY]
 
HEATING DEGREE DAYS 
TOTAL HEATING UNITS FOR YESTERDAY............11   DEPARTURE..........-4
TOTAL HEATING UNITS FOR THE MONTH...........452   DEPARTURE.........-31
TOTAL HEATING UNITS FOR THE SEASON.........5472   DEPARTURE........-494
TOTAL HEATING UNITS LAST SEASON TO DATE....4626   DIFFERENCE.......+846
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...............38 W   AT  5:07 A.M. 
                   AERO....................32 W   AT  5:07 A.M. 
                   ASOS....................36 WNW AT  5:12 A.M.
                   DAVIS...................38 W   AT  5:08 A.M.  RMY: N/A
THE FASTEST MILE FOR YESTERDAY.............27 S   AT 12:05 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..............28 S   AT 12:07 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.............28 SSW AT  N/A 
AVERAGE WIND SPEED AND DIRECTION.........12.4 W      
                   ASOS..................11.9
                   DAVIS.................11.6 W [269 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..........2.29  DEPARTURE...........-1.59
                         ASOS..............2.23
TOTAL PRECIPITATION FOR THE YEAR..........16.38  DEPARTURE...........-1.50
                         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.............Trace   DEPARTURE............-2.9
TOTAL SNOWFALL FOR THE SEASON.............99.0   DEPARTURE...........+36.4
 
PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
 
4/1  61/31/46/+5/0.34/0.0/458/60     40 W   AERO 44 MPH WNW RMY 46  TSTM
4/2  40/27/34/-7/T/T/460/60          45 W   AERO 42 MPH W   RMY 47
4/3  45/27/36/-6/0.00/0.0/755/98     44 W   AERO 43 MPH W   RMY 47
4/4  55/26/41/-1/0.00/0.0/719/93     30 WSW AERO 27 MPH WSW RMY 31
4/5  59/36/48/+5/0.00/0.0/403/52     33 NNW AERO 28 MPH NNW RMY 38
4/6  47/30/39/-4/0.00/0.0/747/96     38 NW  AERO 35 MPH NW  RMY 40 
4/7  52/31/42/-1/0.00/0.0/391/50     51 S   AERO 46 MPH S   RMY 50
4/8  65/43/54/+10/T/0.0/494/63       29 SSW AERO 22 MPH SSW RMY N/A
4/9  72/44/58/+14/T/0.0/456/58       35 WNW AERO 35 MPH WNW RMY 39  TSTM
4/10 64/43/54/+9/0.13/0.0/426/54     23 SE  AERO 20 MPH SE  RMY 25
4/11 52/40/46/+1/0.09/0.0/063/08     18 ENE AERO 14 MPH ENE RMY N/A
4/12 40/34/37/-8/0.58/T/000/00       38 E   AERO 32 MPH E   RMY 41
4/13 52/34/43/-3/0.04/0.0/128/16     31 NNE AERO 27 MPH NNE RMY 21
4/14 52/36/44/-2/0.00/0.0/216/27     31 WNW AERO 27 MPH WNW RMY 32
4/15 55/35/45/-2/0.00/0.0/514/64     21 ESE AERO 15 MPH S   RMY N/A
4/16 62/38/50/+3/T/0.0/540/67        44 S   AERO 40 MPH S   RMY 45
4/17 67/48/58/+11/T/0.0/769/95       29 SSW AERO 25 MPH SSW RMY N/A
4/18 65/43/54/+6/0.00/0.0/503/62     30 S   AERO 25 MPH S   RMY N/A
4/19 72/50/61/+13/0.07/0.0/195/24    47 SSW AERO 48 MPH SSW RMY 50
4/20 62/39/51/+2/0.48/0.0/147/18     43 SSW AERO 41 MPH SSW RMY N/A
4/21 53/31/42/-7/0.00/0.0/819/100    31 WNW AERO 25 MPH WNW RMY N/A
4/22 49/35/42/-7/0.00/0.0/.../..     32 E   AERO 28 MPH E   RMY 33
4/23 40/38/39/-11/0.50/0.0./000/00   35 NNE AERO 30 MPH NNE RMY 35
4/24 72/40/56/+6/0.01/0.0/.../..     36 SSW AERO 33 MPH SSW RMY N/A
4/25 64/44/54/+4/0.05/0.0/.../..     38 W   AERO 32 MPH W   RMY N/A
 
4/26  morning low temp: 44F; the normal low is now 42F
 
DAILY RECORDS FOR APRIL 2013
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR APRIL 26
HIGH 88 IN 2009
LOW 23 IN 1919
PRECIP 1.64 IN. IN 1931
SNOWFALL 1.0 IN. IN 2000
PEAK GUST 53 MPH SSW IN 1996
 
RECORDS FOR APRIL 27
HIGH 93 IN 1990
LOW 28 IN 1919
PRECIP 1.89 IN 1979
SNOWFALL 2.7 IN. IN 1993
PEAK GUST 65e MPH N IN 1941
 
TODAY'S REPORT PREPARED BY: George Tabeek