Friday, May 24, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MAY 24, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERNIGHT THUNDERSTORM WITH RISING PRESSURE AND STRONG WINDS….

0.27 inches of rain had fallen in the early morning hours due
to a passing overnight thunderstorm. Pressure was increasing
throughout the day and began to increase more rapidly as the
day progressed. Winds continued to increase, however became
calmer between the 10 A.M. and 1 P.M. observation. The peak
gust so far today is 47 miles per hour reported the by the
420C. The high so far today is 68F, 0 degree below the daily
normal maximum of 68F. The low since midnight is 56F, six
degrees above the normal minimum of 50F.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus
Temperature: 61F; Dew Point: 52F; Wind: S at 18G30 kts
Peak wind: 36 MPH (31 kts) S at 6:04 A.M.
Sea-level pressure: 29.68 ins. Hg, rising, then more rapidly
Visibility: 45 miles
6-hr Max temp: 68F
6-hr Min temp: 58F
24-hr Precip: 0.27 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 50 SCT 45 051/61/52/2918G30/968/ FEW CS ALQDS
PK WND 2931/04/ 8/500 53007 70027 10068 20057

10 A.M.
Weather: Scattered cumulus
Temperature: 66F; Dew Point: 50F; Wind: NW at 21G33 kts
Peak wind: 47 MPH (41 kts) NW at 9:58 A.M.
Sea-level pressure: 29.70 ins. Hg, rising, then more rapidly
Visibility: 50 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 50 BKN 50 060/66/50/3221G33/970/ PK WND 3241/58/
8/100 53009

1 P.M.
Weather: Broken cumulus
Temperature: 67F; Dew Point: 49F; Wind: NW at 15G35 kts,
Peak wind: 40 MPH (35 kts) NW at 12:47 P.M.
Sea-level pressure: 29.78 ins. Hg, rising, then more rapidly
Visibility: 75 miles
6-hr Max temp: 68F
6-hr Min temp: 63F
6-hr Precip: 0.00 ins.
BHO SA 1755 55 BKN 75 089/67/49/3215G35/978/ PK WND 3235/47/
8/100 53029 10068 20063

SUMMARY FOR THURSDAY, MAY 23, 2019

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..68
MIN…..48   NORMAL…..50
MEAN….58   NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL…………………….0
TOTAL DEPARTURE FOR THE MONTH…………………..-54 [-2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………7   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE MONTH………….266   DEPARTURE……..+44
TOTAL HEATING UNITS FOR THE SEASON………..6167   DEPARTURE……..-89
TOTAL HEATING UNITS LAST SEASON TO DATE……5822   DIFFERENCE……+345

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH……………4   DEPARTURE………-10
TOTAL COOLING UNITS FOR THE SEASON…………..4   DEPARTURE………39
TOTAL COOLING UNITS LAST SEASON TO DATE……..37   DEPARTURE……..-35

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..36 SSW AT 12:37 P.M.
AERO…………………….37 SSW  AT 12:32 P.M.
ASOS…………………….37 SSW  AT 12:41 P.M.
DAVIS……………………42 S  AT 12:37 P.M.  RMY 40
FASTEST MILE FOR YESTERDAY………………….30 SSW AT 12:32 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….30 SSW AT 12:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………33 S AT 12:38 P.M.
AVERAGE WIND SPEED AND DIRECTION……………17.0 S
ASOS……………………17.2
DAVIS…………………..17.1 S [183 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.27  DEPARTURE…….-0.15
ASOS…………..0.27
TOTAL PRECIPITATION FOR THE MONTH……….3.00  DEPARTURE…….+0.10
ASOS…………..3.07
TOTAL PRECIPITATION FOR THE YEAR……….24.45  DEPARTURE…….+3.00
ASOS………….24.28

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 68/48/58/-1/…/…/…/.. 36 SSW AERO 37 SSW  RMY 40

05/24 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 24
HIGH 92F IN 1964
LOW 35F IN 1956
PRECIP 2.13 INS IN 1951
PEAK GUST 54 MPH NNE IN 2005

RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962

TODAY’S REPORT PREPARED BY: Nicholas Rousseau