Monday, May 27, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MAY 27, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WARM AND SUNNY WITH GOOD VISIBILITY ATOP
GREAT BLUE HILL….

Today we observed fair weather and a good visibility of
70 miles throughout the day. Winds were light, but shifted
from NW-NE as the day went on. Air has remained relatively
dry, with the humidity staying around 50%. A distant fog
was observed offshore during the 1 P.M. observation. The
high so far today is 74F, 5 degrees above the daily normal
maximum of 69F. The low since midnight is 60F, nine degrees
below the normal minimum of 51F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus, few altocumulus
Temperature: 66F; Dew Point: 51F; Wind: NNW at 10G14 kts
Sea-level pressure: 29.91 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 66F
6-hr Min temp: 60F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 300 SCT 70 128/66/51/3410G14/991/ FEW
AC ALQDS/ 8/087 51022 10066 20060

10 A.M.
Weather: Scattered cirrostratus, few altocumulus
Temperature: 74F; Dew Point: 52F; Wind: E at 6 kts,
Wind: Light
Sea-level pressure: 29.91 ins. Hg, rising, then falling
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 75 127/74/52/1006/991/ FEW AC
ALQDS WND LGT/ 8/085 58001

1 P.M.
Weather: Scattered cirrus, few cumulus, distant fog
offshore
Temperature: 73F; Dew Point: 53F; Wind: NE at 5 kts,
Wind: Light
Sea-level pressure: 29.89 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 74F
6-hr Min temp: 66F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 70 122/73/53/0605/989/ FEW CU ALQDS
DSNT FG OFFSHR WND LGT/ 8/102 56005 10074 20066

SUMMARY FOR SUNDAY, MAY 26, 2019

TEMPERATURE (DEGREES F)
MAX…..85   NORMAL…..69
MIN…..49   NORMAL…..51
MEAN….67   NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL……………………+7
TOTAL DEPARTURE FOR THE MONTH…………………..-48 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-6
TOTAL HEATING UNITS FOR THE MONTH………….277   DEPARTURE……..+36
TOTAL HEATING UNITS FOR THE SEASON………..6178   DEPARTURE……..-97
TOTAL HEATING UNITS LAST SEASON TO DATE……5825   DIFFERENCE……+353

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE………+1
TOTAL COOLING UNITS FOR THE MONTH……………6   DEPARTURE………-9
TOTAL COOLING UNITS FOR THE SEASON…………..6   DEPARTURE……..-11
TOTAL COOLING UNITS LAST SEASON TO DATE……..52   DEPARTURE……..-46

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..40 W    AT  3:42 P.M.
AERO…………………….38 W    AT  4:42 P.M.
ASOS…………………….41 W    AT  3:42 P.M.
DAVIS……………………42 WSW  AT  3:41 P.M.  RMY 39
FASTEST MILE FOR YESTERDAY………………….31 W    AT  3:42 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….29 W    AT  3:43 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………31 WSW  AT  2:26 P.M.
AVERAGE WIND SPEED AND DIRECTION……………14.6 W
ASOS……………………14.5
DAVIS…………………..14.7 SW [233 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.74  DEPARTURE…….+0.38
ASOS…………..3.56
TOTAL PRECIPITATION FOR THE YEAR……….24.92  DEPARTURE…….+3.01
ASOS………….24.71

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

05/01 57/40/49/-4/0.00/0.0/…/..           21 S   AERO 21 SSE  RMY 21
05/02 45/41/43/-10/0.02/0.0/…/..          21 NE  AERO 21 SSW  RMY 20
05/03 60/43/52/-1/…./0.0/…/..           23 S   AERO 23 S    RMY 22
05/04 54/46/50/-4/…./0.0/…/..           14 ENE AERO 14 ENE  RMY 17
05/05 52/44/48/-6/0.00/0.0/…/..           18 NE  AERO 20 NE   RMY N/A
05/06 58/44/51/-3/…./0.0/…/..           25 NE  AERO 26 ENE  RMY 24
05/07 72/41/57/+2/0.12/0.0/…/..           30 S   AERO 29 S    RMY 30
05/08 67/48/58/+3/0.00/0.0/…/..           20 NE  AERO 20 NE   RMY 19
05/09 60/43/52/-3/0.00/0.0/…/..           21 SE  AERO 21 E    RMY 22
05/10 61/46/54/-1/0.16/0.0/…/..           35 S   AERO 37 S    RMY 37
05/11 68/50/59/+3/…./…/…/..           26 NW  AERO M  M    RMY N/A
05/12 50/36/43/-13/0.68/…/…/..          30 ENE AERO M  M    RMY N/A
05/13 52/38/45/-11/…./…/…/..          35 E   AERO M  M    RMY 34
05/14 44/38/41/-16/…./…/…/..          26 NNE AERO M  M    RMY 25
05/15 58/40/49/-8/…./…/…/..           28 NW  AERO M  M    RMY 28
05/16 68/46/57/0/…./…/…/..            17 NW  AERO M  M    RMY 19
05/17 64/49/57/0/…./…/…/..    22 WNW AERO 21 WNW  RMY 25
05/18 72/49/61/+3/…./…/…/..           26 SSE AERO 25 SSE  RMY 29
05/19 69/50/60/+2/…./…/…/..           39 S   AERO 43 SSE  RMY 42
05/20 85/52/69/11/…./…/…/..    35 SW  AERO 40 SW   RMY 39
05/21 69/52/61/+2/0.00/…/…/..           40 NW  AERO 46 NW   RMY 45
05/22 68/49/59/0/0.00/…/…/..            32 NNW AERO 29 NW   RMY N/A
05/23 68/48/58/-1/…./…/…/..    36 SSW AERO 37 SSW  RMY 40
05/24 68/47/58/-1/…./…/…/..    47 NW  AERO 47 NW   RMY 51
05/25 75/47/61/+1/…./…/…/..     M  M   AERO 35 SSW  RMY 39
05/26 85/49/67/+7/…./0.0/…/..           40 W   AERO 38 W    RMY 39

05/27 Low temp since midnight is 60F; normal low is 51F

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

RECORDS FOR MAY 27
HIGH 92F IN 1914
LOW 36F IN 1915
PRECIP 1.40 INS IN 1898
PEAK GUST 55 S IN 1956

RECORDS FOR MAY 28
HIGH 92F IN 2016
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946

TODAY’S REPORT PREPARED BY: Benjamin Turner