Tuesday, May 24, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MAY 24, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

THICK FOG AND LIGHT DRIZZLE PERSIST THROUGHOUT MORNING
AND EARLY AFTERNOON

Precipitation from early morning thunderstorms totaled
0.10 in. at 7:00am EST.  Light drizzle continued throughout
the day, adding 0.01 in. at the 10:00am EST observation.

Thick fog reduced visibility to 1/4 mile at 10:00am EST, but
started lifting in the afternoon.  Temperatures only rose to
53F by 1:00PM EST, 16F below normal.

Today’s Observations:

7 A.M.
Weather: Light drizzle, fog
Temperature: 51F; Dew Point: 50F; Wind: NE at 12G16 kts,
Sea-level pressure: 29.91 ins. Hg, rising, then more slowly
Visibility: 1 mile
6-hr Max temp: 57F
6-hr Min temp: 50F
24-hr precip: 0.10 in.
BHO SA 1155 W3 X 1 L-F 128/51/50/0412G16/991/ 8//// 51007
ASOS 60008 70008 MANUAL 70010 10057 20050

10 A.M.
Weather: Light drizzle, fog
Temperature: 52F; Dew Point: 51F; Wind: NE 10G18 kts,
Sea-level pressure: 29.91 ins. Hg, falling then rising
Visibility: 1/4 mile
3-hr precip: 0.01 in.
BHO SA 1455 W2 X 1/4 L-F 130/52/51/0410G18/991/ 8//// 53002
ASOS 60001 MANUAL 60001

1 P.M.
Weather: Light drizzle, fog
Temperature: 53F; Dew Point: 51F; Wind: NE at 8G16 kts
Sea-level pressure: 29.92 ins. Hg, rising, then falling
Visibility: 3 miles
6-hr Max temp: 53F
6-hr Min temp: 50F
6-hr precip: 0.01 in.
BHO SA 1755 W4 X 3 L-F 132/53/51/0508G16/992/ 8//// 50002
ASOS 60001 MANUAL 60001 10053 20050

SUMMARY FOR MONDAY, MAY 23, 2016

TEMPERATURE (DEGREES F)
MAX…..74   NORMAL…..68
MIN…..51   NORMAL…..50
MEAN….63   NORMAL…..59

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

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………2   DEPARTURE……….-6
TOTAL HEATING UNITS FOR THE MONTH………….238   DEPARTURE………+16
TOTAL HEATING UNITS FOR THE SEASON………..5230   DEPARTURE…….-1026
TOTAL HEATING UNITS LAST SEASON TO DATE……6401   DIFFERENCE……-1171

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….22 ENE AT  1:24 P.M.
ASOS……………………23 ENE AT  1:10 P.M.
DAVIS…………………..22 NE  AT  1:24 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………15 ENE AT  3:04 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 ENE AT  1:26 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 NE  AT  1:25 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..7.5 ESE
ASOS…………………..7.7
DAVIS………………….6.8 NE [050 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.10  DEPARTURE……-0.15
ASOS…………..0.08
TOTAL PRECIPITATION FOR THE MONTH……….2.24  DEPARTURE……-0.66
ASOS…………..2.11
TOTAL PRECIPITATION FOR THE YEAR……….19.08  DEPARTURE……-2.27
ASOS………….19.11

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE MONTH…………..TRACE  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE SEASON…………..57.5  DEPARTURE…….-5.7

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

5/1 52/39/46/-7/0.08/T/000/00               21 S   AERO 22 SE  RMY 20
5/2 50/41/46/-7/0.31/0.0/000/00             20 NE  AERO 21 NE  RMY 18
5/3 48/43/46/-7/0.16/0.0/000/00             16 E   AERO 16 E   RMY 17
5/4 48/41/45/-9/0.53/0.0/000/00             33 NE  AERO 35 NE  RMY 34
5/5 44/41/43/-11/0.30/0.0/000/00            39 NNE AERO 41 NNE RMY 39
5/6 54/43/49/-5/0.13/0.0/360/42             28 ENE AERO 29 N   RMY 26
5/7 51/43/47/-8/…/0.0/000/00              25 NE  AERO 25 NE  RMY 23
5/8 60/46/53/-2/…/0.0/284/33              47 W   AERO 53 W   RMY 49
5/9 65/43/54/-1/0.00/0.0/743/86             40 W   AERO 44 W   RMY 40
5/10 69/40/55/0/0.00/0.0/806/93             22 W   AERO 25 WNW RMY 22
5/11 76/50/63/+7/0.00/0.0/808/93            22 WNW AERO 23 WNW*RMY 22
5/12 75/54/65/+9/0.00/0.0/819/94            23 NNE AERO 25 S   RMY 23
5/13 74/52/63/+7/0.21/0.0/079/09            27 S   AERO 27 S   RMY 26
5/14 78/54/66/+9/0.00/0.0/656/75            35 SSW*AERO 40 SSW RMY 37
5/15 60/41/51/-6/0.00/0.0/588/67            50 W   AERO 54 W   RMY 49
5/16 58/38/48/-9/0.00/0.0/800/91            45 W*  AERO 51 WNW RMY 49
5/17 69/47/58/+1/0.00/0.0/344/39            32 W   AERO 38 W   RMY 38
5/18 64/48/56/-2/0.00/0.0/804/91            24 NE  AERO 26 NNW RMY N/A
5/19 66/49/58/0/0.26/0.0/…/..             23 WNW AERO 26 WNW RMY 25
5/20 73/46/60/+2/0.00/0.0/…/..            20 SSE AERO 22 SSE RMY 21
5/21 74/53/64/+5/0.00/0.0/…/..            21 S   AERO 23 S   RMY 21
5/22 64/53/59/0/T/0.0/…/..                26 ENE AERO 29 ENE RMY 26
5/23 74/51/63/+4/T/0.0/…/..               22 ENE AERO 31 ENE RMY N/A

5/24 low temp since midnight is 50F; normal low now 50F

* Last of several occurrences
* All sunshine data corrected to astronomical minutes.

DAILY RECORDS FOR MAY 2016

5/1/16: DAILY RECORD SNOWFALL OF A TRACE,
TIES PREVIOUS RECORDS SET IN 1905, 1917, 1921, and 1995

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 MAY 25
HIGH 91F IN 2007
LOW 37F IN 1967
PRECIP 3.73 INS IN 1967
PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY)

TODAY’S REPORT PREPARED BY: Cece Borries-Strigle