Wednesday, May 25, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 25, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

EARLY MORNING FOG BURNS OFF TO CLEAR SKIES AND 80F TEMPS
BY EARLY AFTERNOON

An additional 0.01 inches of precipitation was measured at 7:00AM EST
this morning from yesterday’s drizzle.  Fog encompassing the hill
blocked visibility to only 1/4 mile.  By 10:00AM, visibility
increased to 25 miles and was very hazy in the distance.

Temperatures warmed very quickly this morning from 56F to 83F by
1:00PM, 14F above the normal maximum temp. of 69F.  Few cirrus
were spotted at 10:00AM, but the sky had completely cleared by
the 1:00PM observation.

Today’s Observations:

7 A.M.
Weather: Fog
Temperature: 56F; Dew Point: 56F; Wind: estimated SW at 5 kts,
Wind: Light and variable
Sea-level pressure: 30.03 ins. Hg, rising steadily
Visibility: 1/8 mile
6-hr Max temp: 56F
6-hr Min temp: 51F
24-hr precip: 0.02 in.
BHO SA 1155 W3 X 1/8F 170/56/56/E2205/003/ WND L/V/ 8//// 52006
ASOS 70001 MANUAL 70002 10056 20051

10 A.M.
Weather: Few cirrus NW
Temperature: 71F; Dew Point: 56F; Wind: estimated SSW 6 kts,
Wind: Light and variable
Sea-level pressure: 30.03 ins. Hg, falling, then more slowly
Visibility: 25 miles, hazy
BHO SA 1455 CLR 25 168/71/56/E2006/003/ FEW CI NW HAZY WND L/V/
8/001 56002

1 P.M.
Weather: Sky clear
Temperature: 83F; Dew Point: 54F; Wind: estimated SW at 6 kts,
Wind: Light and variable
Sea-level pressure: 29.99 ins. Hg, falling, then more quickly
Visibility: 20 miles, hazy
6-hr Max temp: 83F
6-hr Min temp: 56F
BHO SA 1755 CLR 20 157/83/54/E2306/999/ SKC WND L/V/ 8/000 58011
10083 20056

SUMMARY FOR TUESDAY, MAY 24, 2016

TEMPERATURE (DEGREES F)
MAX…..56   NORMAL…..69
MIN…..50   NORMAL…..50
MEAN….53   NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL……………………..-6
TOTAL DEPARTURE FOR THE MONTH…………………….-36 [-1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..12   DEPARTURE……….+5
TOTAL HEATING UNITS FOR THE MONTH………….250   DEPARTURE………+22
TOTAL HEATING UNITS FOR THE SEASON………..5242   DEPARTURE…….-1021
TOTAL HEATING UNITS LAST SEASON TO DATE……6401   DIFFERENCE……-1159

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….30 ENE AT  3:00 A.M.
ASOS……………………31 ENE AT  3:00 A.M.
DAVIS…………………..27 NE  AT  3:00 A.M. RMY 29
FASTEST MILE FOR YESTERDAY…………………20 ENE AT  2:55 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………22 ENE AT  3:03 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20 ENE AT  2:57 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.8 NE
ASOS…………………..9.7
DAVIS………………….8.5 NNE [030 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.02  DEPARTURE……-0.13
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….2.26  DEPARTURE……-0.79
ASOS…………..2.09
TOTAL PRECIPITATION FOR THE YEAR……….19.20  DEPARTURE……-2.40
ASOS………….19.51

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 56/50/53/-6/…/0.0/…/..             30 ENE AERO 31 ENE RMY 29

5/25 low temp since midnight is 51F; normal low now 51F

* Last of several occurrences

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 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)

RECORDS FOR MAY 26
HIGH 94F IN 2010  (RECORD FOR MAY)
LOW 37F IN 1972,2013
PRECIP 1.73 INS IN 2003
SNOWFALL TRACE IN 1967 (Fell as ice pellets in nor’easter)
PEAK GUST 62 MPH NE IN 1967

TODAY’S REPORT PREPARED BY: Cece Borries-Strigle