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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 26, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM FRONT FOLLOWS LOW PRESSURE BRINGING SE WINDS

Rain, drizzle, and fog continued today as the low
pressure system tracked north.  Precip. measured at
7:00AM EST this morning was 1.02 in.  An additional
0.30 in. had fallen by 1:00PM making the storm total
now 1.56 in.

Winds have been lighter today, barely reaching 10 kts 
this afternoon.  A warm front passed before noon, and
direction changed to SE.  Temperatures had warmed to
58F by 1:00PM.


Today's Observations:

7 A.M.
Weather: Light drizzle, sky obscurement due to fog
Temperature: 49F; Dew Point: 49F; Wind: ENE at 12 kts
Sea-level pressure: 29.90 ins. Hg, falling then rising
Visibility: 1/16 miles
6-hr Max temp: 50F
6-hr Min temp: 47F
24-hr precip: 1.16 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 W2 X 1/16L-F 124/49/49/0612/990/ 8//// 55002
MANUAL 70116 ASOS 70121 10050 20047

10 A.M.
Weather: Drizzle, sky obscurement due to fog
Temperature: 52F; Dew Point: 52F; Wind: ENE at 7 kts
Sea-level pressure: 29.87 ins. Hg, falling, then more slowly
Visibility: 1/8 mile
3-hr precip: 0.06 in.
3-hr snowfall: 0.0 in.
BHO SA 1455 W3 X 1/8LF 116/52/52/0607/987/ 8//// 58008
MANUAL 6006/ ASOS 60008

1 P.M.
Weather: Light rain, fog, partial undercast conditions in 
all directions, overcast stratus 
Temperature: 58F; Dew Point: 58F; Wind: SE at 7 kts
Sea-level pressure: 29.86 ins. Hg, steady then falling
Visibility: 1 1/2 miles
6-hr Max temp: 58F
6-hr Min temp: 49F
6-hr precip: 0.30 in.
6-hr snowfall: 0.0 in.
BHO SA 1755 E7 OVC 1 1/2R-F 111/58/58/1407/986/ 
PARTIAL UNDERCAST CND ALQDS/ 8/6// 58005 MANUAL 6030/
ASOS 60027 10058 20049
  

SUMMARY FOR TUESDAY, APRIL 25, 2017
 
TEMPERATURE (DEGREES F)
MAX.....49   NORMAL.....60
MIN.....42   NORMAL.....41
MEAN....46   NORMAL.....50

DEPARTURE FROM 30-YEAR NORMAL.........................-4
TOTAL DEPARTURE FOR THE MONTH........................+90 [+3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............19   DEPARTURE..........+4
TOTAL HEATING UNITS FOR THE MONTH.............400   DEPARTURE.........-83
TOTAL HEATING UNITS FOR THE SEASON...........5302   DEPARTURE........-664
TOTAL HEATING UNITS LAST SEASON TO DATE......4905   DIFFERENCE.......+397

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................35 NE  AT 12:55 P.M.
                   AERO........................36 NE  AT 12:55 P.M.
                   ASOS........................35 NE  AT 12:55 P.M.
                   DAVIS.......................33 ENE AT 12:54 P.M. RMY 35
FASTEST MILE FOR YESTERDAY.....................24 NE  AT  3:55 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................23 ENE AT  4:23 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................22 ENE AT  1:45 P.M.
AVERAGE WIND SPEED AND DIRECTION.............16.0 NE
                   ASOS......................16.3
                   DAVIS.....................13.9 ENE [070 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....1.16  DEPARTURE......+1.03
                         ASOS..............1.21
TOTAL PRECIPITATION FOR THE MONTH..........6.20  DEPARTURE......+2.32
                         ASOS..............6.30
TOTAL PRECIPITATION FOR THE YEAR..........20.32  DEPARTURE......+2.44
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE........0.0
TOTAL SNOWFALL FOR THE MONTH................2.7  DEPARTURE.......-0.2
TOTAL SNOWFALL FOR THE SEASON..............66.4  DEPARTURE.......+3.8


PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
M:    Missing data

4/1  35/31/33/-8/2.21/2.7/000/00           40 ENE AERO 41 ENE RMY 41
4/2  53/30/42/+1/0.00/0.0/552/72           32 NW  AERO 33 NW  RMY 34
4/3  60/35/48/+6/0.00/0.0/685/89           21 W*  AERO 20 NW  RMY N/A
4/4  42/35/39/-3/0.78/0.0/000/00           41 ESE AERO 43 ESE RMY 42
4/5  41/35/38/-5/0.00/0.0/000/00           21 NNW AERO 20 NNW RMY N/A
4/6  55/35/45/+2/1.27/0.0/000/00           35 SSE AERO 37 S   RMY 37  TSTM
4/7  53/38/46/+3/0.00/0.0/226/29           43 SSW AERO 47 SSW RMY 48
4/8  50/34/42/-2/0.00/0.0/666/85           37 WNW AERO 40 WNW RMY 39
4/9  65/34/50/+6/0.00/0.0/716/91           23 W   AERO 23 W   RMY N/A
4/10 77/45/61/+16/0.00/0.0/560/71          37 S   AERO 37 S   RMY 39
4/11 85/50/68/+23/0.00/0.0/642/81          28 S   AERO 28 S   RMY 30
4/12 68/47/58/+13/0.01/0.0/382/48          26 WNW AERO 28 WNW RMY N/A
4/13 58/39/49/+3/0.00/0.0/567/71           28 WNW AERO 31 NW  RMY 30 
4/14 62/40/51/+5/0.00/0.0/801/100          22 NNW AERO 22 NNW RMY 24
4/15 68/40/54/+7/0.01/0.0/675/84           40 SSW AERO 45 SSW RMY 45
4/16 86/55/71/+24/T/0.0/758/94             38 W*  AERO 39 SW  RMY 42
4/17 75/48/62/+15/0.00/0.0/405/50          37 W   AERO 37 W   RMY 43
4/18 52/35/44/-4/0.00/0.0/779/96           25 ENE AERO 23 ENE RMY 25
4/19 54/34/44/-4/0.06/0.0/431/53           31 S   AERO 33 S   RMY 34
4/20 58/42/50/+1/0.05/0.0/270/33           25 SSW AERO 24 SSW RMY 23
4/21 45/42/44/-5/0.50/0.0/000/00           26 ESE AERO 29 ESE RMY 28
4/22 44/40/42/-7/0.14/0.0/.../..           22 NE  AERO 22 NNE RMY 20
4/23 65/37/51/+1/0.00/0.0/.../..           28 S   AERO 26 S   RMY 28
4/24 69/42/56/+6/0.00/0.0/.../..           23 SSW*AERO 22 SSW*RMY N/A
4/25 49/42/46/-4/..../0.0/.../..           35 NE  AERO 36 NE  RMY 35

4/26 Low temp since midnight is 47F; normal low is now 42F


DAILY RECORDS FOR APRIL 2017

4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF 85F,
         BREAKS PREVIOUS RECORD OF 78F SET IN 1945

4/11/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F,
         TIES WITH PREVIOUS RECORD SET IN 1955


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: Cecilia Borries-Strigle