Thursday, May 23, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MAY 23, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A DRY DAY WITH DECREASING PRESSURE AND
INCREASING AFTERNOON WINDS….

Today we observed decreasing visibility throughout
the day, with 70 miles this morning and 40 miles
this afternoon due to haze. Mostly cloudy skies
were seen in conjunction with a pressure fall of
5 mb between this morning and afternoon. Wind has
remained southwesterly, gradually increasing in
intensity. The peak gust so far today is 36 mph,
occurring shortly before the 1 P.M. observation.
The high so far today is 67F, a degree below the
daily normal maximum of 68F. the low since midnight
is 48F, 2 degrees below the normal minimum of 50F.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus
Temperature: 55F; Dew Point: 44F; Wind: SSW at 14G22 kts
Sea-level pressure: 30.21 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 55F
6-hr Min temp: 48F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E70 BKN 70 231/55/44/2014G22/021/ 8/070
58008 10055 20048

10 A.M.
Weather: Overcast stratus
Temperature: 60F; Dew Point: 49F; Wind: S at 14G22 kts
Sea-level pressure: 30.16 ins. Hg, falling, then more rapidly
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E50 OVC 70 215/60/49/1814G22/016/ 8/7// 58016

1 P.M.
Weather: Broken stratocumulus
Temperature: 66F; Dew Point: 44F; Wind: SW at 19G31 kts,
Peak wind: 36 MPH (31 kts) SW at 12:37 P.M.
Sea-level pressure: 30.06 ins. Hg, falling rapidly
Visibility: 40 miles, distant haze
6-hr Max temp: 67F
6-hr Min temp: 55F
6-hr Precip: 0.00 ins.
BHO SA 1755 E50 BKN 40 178/66/44/2219G31/006/ DSNT HZ ALQDS
PK WND 2231/37/ 8/800 58037 10067 20055

SUMMARY FOR WEDNESDAY, MAY 22, 2019

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..68
MIN…..49   NORMAL…..50
MEAN….59   NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL…………………….0
TOTAL DEPARTURE FOR THE MONTH…………………..-54 [-2.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………6   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE MONTH………….259   DEPARTURE……..+49
TOTAL HEATING UNITS FOR THE SEASON………..6160   DEPARTURE……..-88
TOTAL HEATING UNITS LAST SEASON TO DATE……5822   DIFFERENCE……+338

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH……………4   DEPARTURE………-8
TOTAL COOLING UNITS FOR THE SEASON…………..4   DEPARTURE………37
TOTAL COOLING UNITS LAST SEASON TO DATE……..37   DEPARTURE……..-33

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..32 NNW AT 5:55 A.M.
AERO…………………….29 NW  AT 3:53 A.M.
ASOS…………………….35 NW  AT 5:56 A.M.
DAVIS……………………34 W   AT 6:27 A.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….23 NNW AT 6:34 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….22 NW  AT 6:29 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 WNW AT 6:29 A.M.
AVERAGE WIND SPEED AND DIRECTION……………12.0 NW
ASOS……………………12.0
DAVIS…………………..11.9 W [278 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.00  DEPARTURE…….+0.25
ASOS…………..2.82
TOTAL PRECIPITATION FOR THE YEAR……….24.18  DEPARTURE…….+2.88
ASOS………….24.03

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/…./…/…/..           23 S   AERO 23 S    RMY 22
05/04 54/46/50/-4/…./…/…/..           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 Low temp since midnight is 48F; normal low is 50F

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

RECORDS FOR MAY 23
HIGH 92F IN 1964,1992
LOW 38F IN 1976
PRECIP 0.97 INS IN 1979
PEAK GUST 49e MPH W IN 1945

RECORDS FOR MAY 24
HIGH 92F IN 1964
LOW 35F IN 1956
PRECIP 2.13 INS IN 1951
PEAK GUST 54 MPH NNE IN 2005

TODAY’S REPORT PREPARED BY: Benjamin Turner