Wednesday, June 24, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JUNE 24, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

SEVERE STORMS SPARE GREAT BLUE HILL, STRIKE
THROUGHOUT THE REGION

Tornado warnings were issued both on the North Shore
and south toward the Rhode Island border, while the summit
of Great Blue Hill was largely spared. Gusty winds and a
couple brief showers came throughout the day, while storms
developed in other areas. Only 0.01 inches of new rain was
reported at the station, bringing our annual precipitation
deficit to 3.28 inches below normal.

Drier air worked in overnight after the passing cold front,
bringing an overnight minimum of 62F. Northwesterly winds
have brought much improved visibility as well, with visibility
topping 70 miles this morning.
Today’s Observations:

7 A.M.
Weather: Clear, few cumulus distant WSW-N, few cirrostratus
distant ESE-SSW
Temperature: 69F; Dew Point: 58F; Wind: NW at 12G20 kts
Sea-level pressure: 29.93 ins. Hg, increasing, then more slowly
Visibility: 70 miles
6-hr Max temp: 69F
6-hr Min temp: 62F
24-hr precip: 0.01 inches
BHO SA 1155 CLR 70 135/69/58/3112G20/993/ FEW CU DSNT WSW-N
FEW CS DSNT ESE-SSW/ 8/108 51024 MANUAL 70001 10069 20062

10 A.M.
Weather: Scattered cumulus
Temperature: 75F; Dew Point: 58F; Wind: WNW at 11G18 kts
Sea-level pressure: 29.95 ins. Hg, increasing, then more slowly
Visibility: 70 miles
BHO SA 1455 40 SCT 70 143/75/58/2911G18/995/ 8/100 51008

SUMMARY FOR TUESDAY, JUNE 23, 2015

TEMPERATURE (DEGREES F)
MAX…..85   NORMAL…..77
MIN…..67   NORMAL…..59
MEAN….76   NORMAL…..68

DEPARTURE FROM 30-YEAR NORMAL……………………+8
TOTAL DEPARTURE FOR THE MONTH…………………..-19 [-1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0  DEPARTURE………..-1
TOTAL HEATING UNITS FOR THE MONTH…………..87  DEPARTURE……….+20
TOTAL HEATING UNITS FOR THE SEASON………..6491  DEPARTURE………+121
TOTAL HEATING UNITS LAST SEASON TO DATE……6422  DIFFERENCE………+69

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..11   DEPARTURE……….+7
TOTAL COOLING UNITS FOR THE MONTH…………..71   DEPARTURE……….+3
TOTAL COOLING UNITS FOR THE SEASON…………120   DEPARTURE………+28
TOTAL COOLING UNITS LAST SEASON TO DATE……..68   DIFFERENCE……..+52

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….36 S    AT   9:38 A.M.
ASOS……………………41 S    AT   9:38 A.M.
DAVIS…………………..37 S    AT   9:23 A.M. RMY 38
FASTEST MILE FOR YESTERDAY…………………28 SSW  AT  10:30 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………26 SSW  AT  10:44 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..25 SSW  AT  10:44 A.M.
AVERAGE WIND SPEED AND DIRECTION………….14.5 SSW
ASOS………………….14.4
DAVIS…………………13.1 SSW [207 deg.] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.01   DEPARTURE….-0.10
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..3.38   DEPARTURE….-0.12
ASOS……………3.39
TOTAL PRECIPITATION FOR THE YEAR………. 22.75   DEPARTURE….-3.28
ASOS……………N/A ***

*** ASOS annual totals not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

6/1  48/46/47/-15/0.69/000/00              32 NE  RMY 34
6/2  47/44/46/-16/…./000/00              28 NNE RMY 28
6/3  59/44/52/-10/0.00/172/19              16 ESE RMY 16
6/4  63/46/55/-8/0.00/445/49               17 E   RMY 16
6/5  70/49/60/-3/T/500/55                  17 NNE RMY 17
6/6  65/52/59/-4/0.06/382/42               26 ENE RMY 27
6/7  73/49/61/-3/0.00/884/97               28 S   RMY 29
6/8  73/50/62/-2/T/310/34                  41 SSW RMY 48
6/9  76/61/69/+4/0.03/228/25               29 SSW RMY 32
6/10 82/57/70/+5/0.00/840/92               24 WSW RMY N/A
6/11 85/61/73/+8/0.00/594/65               29 SSW RMY 32
6/12 86/65/76/+11/…./522/57              26 S   RMY 29
6/13 83/67/75/+10/T/586/64                 24 N   RMY 27
6/14 75/61/68/+2/0.00/641/70               21 SSE RMY 21
6/15 61/52/57/-9/…./000/00               25 SE  RMY 26
6/16 73/56/65/-1/…./009/01               18 NW  RMY N/A
6/17 70/57/64/-3/0.00/…/..               28 NE  RMY 28
6/18 76/54/65/-2/0.00/…/..               22 S   RMY 26
6/19 84/60/72/+5/T/…/..                  24 SSW RMY 22
6/20 75/56/66/-2/…./…/..               23 SSE RMY N/A
6/21 76/60/68/0/…./…/..                26 S   RMY 29
6/22 83/63/73/+5/0.00/…/..               20 WNW RMY 19
6/23 85/67/76/+8/0.01/…/..               36 S   RMY 38

6/24 low since midnight is 62F; normal low is now 60F

DAILY RECORDS FOR JUNE 2015

6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F
surpasses previous record of 51F in 2004

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

RECORDS FOR JUNE 24
HIGH 91F IN 1914,1976,2013
LOW 40F IN 1932
PRECIP 2.80 INS IN 1929
PEAK GUST 54 MPH WNW IN 2010

RECORDS FOR JUNE 25
HIGH 93F IN 1943,1980, 2005
LOW 47F IN 1903
PRECIP 1.38 INS IN 2012
PEAK GUST 51 MPH W IN 1960

TODAY’S REPORT PREPARED BY: Brian Fitzgerald