Monday, May 15, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MAY 15, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
SKIES BEGIN TO CLEAR IN AFTERNOON AFTER RAINY MORNING
Light rain and drizzle continued on and off this morning
through the 10:00AM EST observation. The precip. total
for the storm measured 1.92 in. by 1:00PM today. The
monthly total through 7:00AM today was 3.08 in, which is
1.37 in. above the monthly normal. Skies began to clear
once the rain had ended, and visibility improved to 70 miles
by the afternoon.
Today’s Observations:
7 A.M.
Weather: Broken stratocumulus, overcast stratus
Temperature: 46F; Dew Point: 43F; Wind: NW at 15G20 kts
Sea-level pressure: 29.48 ins. Hg, rising, then more quickly
Visibility: 20 miles, except 40 miles NNE to SSE, distant fog N-S
6-hr Max temp: 46F
6-hr Min temp: 43F
24-hr precip: 0.45 in.
BHO SA 1155 E15 BKN 37 OVC 20 984/46/43/3115G20/948/ VSBY NNE-SSE 40
DSNT FG N-S/ 8/6// 53014 MANUAL 70045 ASOS 70048 10046 20043
10 A.M.
Weather: Light drizzle, broken stratus fractus, overcast nimbostratus
Temperature: 47F; Dew Point: 47F; Wind: WNW at 9G16 kts
Sea-level pressure: 29.53 ins. Hg, rising unsteadily
Visibility: 20 miles
3-hr precip: 0.07 in.
BHO SA 1455 E24 BKN 46 OVC 20L- 000/47/47/3009G16/953/
STFRA DRFTG BLO SMT E-NW/ 8/7// 51016 MANUAL 6007/ ASOS 60007
1 P.M.
Weather: Broken stratocumulus, broken stratus
Temperature: 56F; Dew Point: 47F; Wind: NW at 10G20 kts,
Peak wind: 26 kts (30 MPH) NW at 12:37PM EST
Sea-level pressure: 29.55 ins. Hg, rising unsteadily
Visibility: 70 miles
6-hr Max temp: 57F
6-hr Min temp: 45F
6-hr precip: 0.07 in.
BHO SA 1755 E28 BKN 39 BKN 70 007/56/47/3210G20/955/ PK WND 3226/37/
8/600 53007 MANUAL 6007/ ASOS 60007 10057 20045
SUMMARY FOR SUNDAY, MAY 14, 2017
TEMPERATURE (DEGREES F)
MAX…..47 NORMAL…..66
MIN…..43 NORMAL…..47
MEAN….45 NORMAL…..57
DEPARTURE FROM 30-YEAR NORMAL……………………-12
TOTAL DEPARTURE FOR THE MONTH……………………-62 [-4.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..20 DEPARTURE………+11
TOTAL HEATING UNITS FOR THE MONTH………….206 DEPARTURE………+55
TOTAL HEATING UNITS FOR THE SEASON………..5539 DEPARTURE……..-647
TOTAL HEATING UNITS LAST SEASON TO DATE……5162 DIFFERENCE…….+377
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….33 NNE AT 7:48 A.M.
AERO……………………36 N AT 12:02 P.M.
ASOS……………………36 NNE AT 7:15 A.M.
DAVIS…………………..33 NNW AT 1:42 P.M. RMY 36
FASTEST MILE FOR YESTERDAY…………………26 N AT 11:48 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………26 N AT 11:49 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..25 N AT 11:49 A.M.
AVERAGE WIND SPEED AND DIRECTION………….15.2 NNE
ASOS………………….15.2
DAVIS…………………14.0 N [350 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.45 DEPARTURE……+0.33
ASOS…………..0.48
TOTAL PRECIPITATION FOR THE MONTH……….3.08 DEPARTURE……+1.37
ASOS…………..3.15
TOTAL PRECIPITATION FOR THE YEAR……….23.89 DEPARTURE……+3.63
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
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/-1/0.00/…/.. 23 S AERO 23 S RMY 24
5/5 51/44/48/-6/0.73/…/.. 28 E AERO 28 E RMY N/A
5/6 65/50/58/+4/0.23/…/.. 46 SSE AERO 48 SSE RMY 49
5/7 63/47/55/0/T/…/.. 35 S AERO 38 S RMY 39
5/8 54/38/46/-9/T/…/.. 29 WSW AERO 29 WSW RMY 32
5/9 53/36/45/-10/T/…/.. 20 ESE AERO 17 ESE RMY 19
5/10 57/42/50/-5/0.00/…/.. 17 NNE AERO 16 NW RMY N/A
5/11 58/45/52/-4/0.00/…/.. 23 NE* AERO 23 NE RMY 23
5/12 57/41/49/-7/0.01/…/.. 21 NE AERO 20 NE RMY 19
5/13 57/41/49/-7/…./…/.. 24 ENE AERO 24 E RMY N/A
5/14 47/43/45/-12/…./…/.. 33 NNE AERO 36 N RMY 36
5/15 Low temp since midnight is 43F; normal low is now 48F
DAILY RECORDS FOR MAY
None so far.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR MAY 15
HIGH 93F IN 1900
LOW 36F IN 1947,1985
PRECIP 1.63 INCHES IN 1978
PEAK GUST 53e MPH NE IN 1978, W 2002
RECORDS FOR MAY 16
HIGH 90F IN 1951
LOW 30F IN 1936
PRECIP 2.63 INCHES IN 1954
PEAK GUST 56e MPH NW IN 1952
TODAY’S REPORT PREPARED BY: Nick Rousseau and Cecilia Borries-Strigle
