Sunday, May 7, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 7, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY MORNING SKIES TURN PARTLY SUNNY,
HIGH CLOUDS MOVE IN BY AFTERNOON

Cloudy conditions began clearing early this morning to
make for scattered cumulus by 7:00AM EST.  Skies remained
partly cloudy for the remainder of the morning.  High
clouds were spotted at the 10:00AM observation and were
scattered by 1:00PM as cumulus became few.

Winds have been out of the south and south-southwest today
with gusts consistently 30 MPH or more.  Temperatures had
risen to 62F by 1:00PM from a morning low of 50F which are
fairly normal levels for the time of year.  With drying
conditions, dew points decreased to the low 40s.

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: Scattered cumulus
Temperature: 53F; Dew Point: 44F; Wind: SSW at 16G25 kts,
Peak Wind: 26 kts (30 MPH) S at 6:46AM EST
Sea-level pressure: 29.62 ins. Hg, rising unsteadily
Visibility: 70 miles
6-hr Max temp: 53F
6-hr Min temp: 50F
24-hr precip: 0.21 ins.
BHO SA 1155 18 SCT 70 031/53/44/2016G26/962/ PK WND 1926/46/
8/100 52026 MANUAL 70021 ASOS 70022 10053 20050

10 A.M.
Weather: Scattered cumulus, few cirrus in all directions
Temperature: 60F; Dew Point: 43F; Wind: S at 17G25 kts
Sea-level pressure: 29.65 ins. Hg, rising then steady
Visibility: 70 miles
BHO SA 1455 34 SCT 70 040/60/43/1817G25/965/ FEW CI ALQDS/ 8/101
51009

1 P.M.
Weather: Few cumulus in all directions, scattered cirrostratus
Temperature: 62F; Dew Point: 40F; Wind: S at 19G26 kts,
Peak Wind: 26 kts (30 MPH) S at 12:04PM EST
Sea-level pressure: 29.65 ins. Hg, falling slightly
Visibility: 70 miles
6-hr Max temp: 62F
6-hr Min temp: 52F
BHO SA 1755 250 SCT 70 042/62/40/1819G26/965/ FEW CU ALQDS PK WND
1926/04/ 8/106 53002 10062 20052

SUMMARY FOR SATURDAY, MAY 6, 2017

TEMPERATURE (DEGREES F)
MAX…..65   NORMAL…..64
MIN…..50   NORMAL…..45
MEAN….58   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL…………………….+4
TOTAL DEPARTURE FOR THE MONTH…………………….-8 [-1.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………7   DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH…………..77   DEPARTURE……….+6
TOTAL HEATING UNITS FOR THE SEASON………..5410   DEPARTURE……..-696
TOTAL HEATING UNITS LAST SEASON TO DATE……5107   DIFFERENCE…….+303

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….46 SSE AT 6:53 A.M.
AERO……………………48 SSE AT 6:53 A.M.
ASOS……………………45 SSE AT 6:52 A.M.
DAVIS…………………..46  S  AT 6:53 A.M. RMY 49
FASTEST MILE FOR YESTERDAY…………………35 SSE AT 6:53 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………33 SSE AT 6:53 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..34 SSE AT 6:53 A.M.
AVERAGE WIND SPEED AND DIRECTION………….16.3 SSE
ASOS………………….16.2
DAVIS…………………13.9  S [180 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.21  DEPARTURE……+0.09
ASOS…………..0.22
TOTAL PRECIPITATION FOR THE MONTH……….1.22  DEPARTURE……+0.48
ASOS…………..1.27
TOTAL PRECIPITATION FOR THE YEAR……….22.03  DEPARTURE……+2.74
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  65/50/58/+4/…./…/..               46 SSE AERO 48 SSE RMY 49

5/7  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 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

RECORDS FOR MAY 8
HIGH 89F IN 2000
LOW 29F IN 1956
PRECIP 1.48 INCHES IN 1886
SNOWFALL TRACE IN 1898, 1947
PEAK GUST 68e MPH NNW IN 1943

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle