Saturday, May 6, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MAY 6, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

0.94 INS. OF RAIN UP TO 1:00 P.M. EST

0.94 ins. of rain fell from yesterday up to the 1:00 P.M. EST observation today.
It rained at a light to moderate pace all morning, but rain stopped shortly before
1:00 P.M. Blue Hill has now had 0.62 more ins. of rain than normal for the month,
and 2.65 more ins. of precipitation than normal for the year. of Stratus clouds
covered the sky with some cumulus fractus earlier in the morning. The temperature
warmed from around 50 last night to the low 60s at the 7:00 A.M. observation,
which is where it remained for the rest of the day. Winds around 7:00 A.M. were
very blustery. The peak gust measured so far was 46 MPH out of the SSE at 6:53 A.M.
Winds slowed down in the late morning and afternoon, but remained out of the SSE.
Visibility was poor due to the rain and distant fog in the area. The best
visibility of the day was 30 miles at 1:00 P.M. EST.

PRELIMINARY STATS FOR APRIL 2017

TEMPERATURE, Deg. F
Avg. Max. 60.6 [+4.9] Avg. Min. 41.3 [+3.6] Mean      51.0 [+4.3] 24-hour corrected mean: 50.1
Max. for month: 86F on 16th
Min. for month: 30F on 2nd

HEATING DEGREE DAYS
Total heating units: 431 [-120] Total for the season: 5333 [-702] Total for last season: 4992

COOLING DEGREE DAYS
Total cooling units: 20 [+18] Total for the season: 20 [+18] Total for last season: 3

PRECIPITATION, Inches
Total: 6.69 [+2.14] Greatest in 24 hrs: 2.21 in. on 1st

SNOWFALL, Inches
Total: 2.7 [-0.3] Greatest in 24 hrs: 2.7 in. on 1st

WIND, mph
Avg. uncorrected wind speed: 12.4
Avg. corrected wind speed: 12.8
Prevailing wind direction: S at 10%
Peak gust and direction: 43 SSW on 7th and 43 WNW on 29TH

SUNSHINE:
Campbell-Stokes card minutes: 11,358 minutes of possible 23,250 or 49%
Astronomical total minutes: 11,797 minutes of possible 24,126 or 49%

BHO Warmest April 24-Hour Mean Temperature, deg F (1885-2017):

1) 51.5 in 2010
2) 51.0 in 1976
3) 50.1 in 2017
4) 49.9 in 2012
5) 49.4 in 1945
6) 49.0 in 1994
7) 48.9 in 2005
48.9 in 2009

Today’s Observations:

7 A.M.
Weather: Light rain showers starting and stopping, few cumulus fractus in
all directions, overcast stratus
Temperature: 61F; Dew Point: 61F; Wind: SSE at 29G40 kts,
Peak Wind: 40 kts (46 MPH) SSE at 6:53 A.M. EST
Sea-level pressure: 29.49 ins. Hg, falling, then more quickly
Visibility: 25 miles, distant fog in all directions
6-hr Max temp: 61F
6-hr Min temp: 50F
24-hr precip: 0.75 ins.
BHO SA 1155 E8 OVC 25RW- 998/61/61/1529G40/949/ FEW CUFRA ALQDS DSNT FG
ALQDS PK WND 1540/53/ 8/7// 58024 MANUAL 70075 ASOS 70078 10061 20050

10 A.M.
Weather: Rain, overcast stratus
Temperature: 61F; Dew Point: 61F; Wind: SSE at 17G24 kts
Sea-level pressure: 29.54 ins. Hg, falling, then rising
3-hr precip: 0.09 ins.
Visibility: 2 1/2 miles
BHO SA 1455 E8 OVC 2 1/2R 005/61/61/1617G24/954/ 8/6// 51007 MANUAL 60009
ASOS 60004

1 P.M.
Weather: Overcast stratus
Temperature: 60F; Dew Point: 59F; Wind: SSE at 16G23 kts
Sea-level pressure: 29.49 ins. Hg, falling, then more slowly
Visibility: 30 miles, distant fog in all directions
6-hr Max temp: 63F
6-hr Min temp: 58F
6-hr precip: 0.19 ins
BHO SA 1755 E19 OVC 30 998/60/59/1616G23/949/ DSNT FG ALQDS/ 8/6// 56007
MANUAL 60019 ASOS 60021 10063 20058

SUMMARY FOR FRIDAY, MAY 5, 2017

TEMPERATURE (DEGREES F)
MAX…..51   NORMAL…..63
MIN…..44   NORMAL…..45
MEAN….48   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL…………………….-6
TOTAL DEPARTURE FOR THE MONTH……………………-12 [-2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..17   DEPARTURE……….+5
TOTAL HEATING UNITS FOR THE MONTH…………..70   DEPARTURE………+10
TOTAL HEATING UNITS FOR THE SEASON………..5403   DEPARTURE……..-692
TOTAL HEATING UNITS LAST SEASON TO DATE……5091   DIFFERENCE…….+312

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 E AT 3:57 P.M.
AERO……………………28 E AT 5:51 P.M.
ASOS……………………28 E AT 5:53 P.M.
DAVIS…………………..25 E AT 3:57 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………22 E AT 5:51 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 E AT 5:53 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20 E AT 5:53 P.M.
AVERAGE WIND SPEED AND DIRECTION………….10.7 E
ASOS………………….11.2
DAVIS………………….8.9 ESE [115 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.75  DEPARTURE……+0.62
ASOS…………..0.78
TOTAL PRECIPITATION FOR THE MONTH……….1.01  DEPARTURE……+0.39
ASOS…………..1.02
TOTAL PRECIPITATION FOR THE YEAR……….21.82  DEPARTURE……+2.65
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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 58/41/50/+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/-7/0.14/0.0/000/00           22 NE  AERO 22 NNE RMY 20
4/23 65/37/51/+1/0.00/0.0/809/98           28 S   AERO 26 S   RMY 28
4/24 69/42/56/+6/0.00/0.0/562/68           23 SSW*AERO 22 SSW*RMY N/A
4/25 49/42/46/-4/0.97/0.0/000/00           35 NE  AERO 36 NE  RMY 35
4/26 60/47/54/+3/0.63/0.0/000/00           29 ENE AERO 28 ENE RMY N/A
4/27 66/50/58/+7/T/0.0/134/16              20 S   AERO 20 S   RMY N/A
4/28 81/56/69/+17/0.02/0.0/453/54          25 W   AERO 23 W   RMY 26
4/29 83/60/72/+20/0.00/0.0/294/35          43 WNW AERO 46 WNW RMY 47
4/30 60/43/52/0/0.04/T/430/51              25 E   AERO 25 WNW RMY N/A

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

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
M:    Missing data

5/1  50/43/47/-6/T/…/..                  21 N   AERO 18 N   RMY 22
5/2  65/42/54/+1/0.26/…/..               41 W   AERO 44 W   RMY 43
5/3  52/42/53/0/0.00/…/..                37 WNW*AERO 39 WNW RMY 40
5/4  65/40/53/-1/…/…/..                23 S   AERO 23 S   RMY 24
5/5  51/44/48/-6/…/…/..                28 E   AERO 28 E   RMY N/A

5/6  Low temp since midnight is 50F; normal low is now 45F

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

RECORDS FOR MAY 6
HIGH 90F IN 1930
LOW 29F IN 1891
PRECIP 1.04 INCHES IN 1890
SNOWFALL TRACE IN 1917,1996
PEAK GUST 65 MPH SSE IN 1989

RECORDS FOR MAY 7
HIGH 93F IN 1930
LOW 33F IN 1970
PRECIP 1.19 INCHES IN 2005
SNOWFALL TRACE IN 1967
PEAK GUST 66e MPH WNW IN 1940

TODAY’S REPORT PREPARED BY: Lizzy Suzedell