Tuesday, June 7, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JUNE 7, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

EARLY MORNING ALTOCUMULUS CASTELLANUS A HARBINGER OF THUNDERSTORMS
LATER IN THE DAY SHOWED INSTABILITY IN MID ATMOSPHERIC LAYERS
SOME BUILDING CUMULUS CLOUDS TODAY BEFORE SOME EXPECTED SHOWERS
AND THUNDERSTORMS LATER IN THE AFTERNOON

There was a display of rather classic looking altocumulus castellanus
early this morning and again later in the morning just before the
rather rapid formation of towering cumulus.  Temperatures continue
above normal with the early morning low of 63F running some 8 deg.
above the average minimum temperature for this date.

Today’s Observations:

7 A.M.
Weather: Scattered stratus fractus, scattered altocumulus
castellanus, (2 levels)
Temperature: 69F; Dew Point: 61F; Wind: SSW at 8 kts
Sea-level pressure: 29.56 ins. Hg, falling then more slowly
Visibility: 20 miles, hazy
6-hr Max temp: 69F
6-hr Min temp: 63F
24-hr precip: 0.00
BHO SA 1155 12 SCT 70 SCT 95 SCT 20 009/69/61/2108/956/ SCT STFRA
ACC SW AND NNW-NNE HAZY/ 8/680 56008 10069 20063

10 A.M.
Weather: Scattered altocumulus castellanus, few lenticularis,
few cumulus WSW-NNW and few cumulus E-ESE, broken cirrus/cirrostratus
E-S invading
Temperature: 78F; Dew Point: 63F; Wind: S at 10 kts,
Wind: Direction variable SSW-WNW
Sea-level pressure: 29.49 ins. Hg, falling then more rapidly
Visibility: 30 miles, except NE 20 miles
BHO SA 1455 70 SCT 100 SCT 220 BKN 30 988/78/63/1910/949/
FEW CU FRMG DSNT WSW-WNW AND E-ESE ACC ALQDS CI/CS LYR E-S
INVADING VSBY NE 20 HAZY ALQDS WND 15V22/ 8/186 58021

1 P.M.
Weather: Scattered small cumulonimbus, few moderate cumulus,
scattered altocumulus formed by spreading out of cumulonimbus,
broken dense cirrus
Temperature: 80F; Dew Point: 66F; Wind: S at 11 kts.
Sea-level pressure: 29.44 ins. Hg, falling then more rapidly
Visibility: 25 miles
6-hr Max temp: 81F
6-hr Min temp: 69F
BHO SA 1755 45 SCT 95 SCT E220 BKN 25 971/80/66/1911/944/
SML CB/SHRA 12 N-NE MOVG ENE FEW TCU DNS CI NE-SE VSBY LWR
NNE-NE HAZY/ 8/362 58017 10081 20069

SUMMARY FOR MONDAY JUNE 6, 2016

TEMPERATURE (DEGREES F)
MAX…..80   NORMAL…..72
MIN…..63   NORMAL…..54
MEAN….72   NORMAL…..63

DEPARTURE FROM 30-YEAR NORMAL…………………….+9
TOTAL DEPARTURE FOR THE MONTH……………………+20 [+3.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH……………8   DEPARTURE………-18
TOTAL HEATING UNITS FOR THE SEASON………..5256   DEPARTURE…….-1073
TOTAL HEATING UNITS LAST SEASON TO DATE……6475   DIFFERENCE……-1219

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………7   DEPARTURE……….+5
TOTAL COOLING UNITS FOR THE MONTH…………..13   DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE SEASON………….61   DEPARTURE………+26
TOTAL COOLING UNITS LAST SEASON TO DATE……..49   DIFFERENCE……..+12

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….26 W   AT 12:58 P.M.
ASOS……………………27 W   AT 12:58 P.M.
DAVIS…………………..25 WSW AT  2:19 P.M. RMY 27
FASTEST MILE FOR YESTERDAY…………………19 W   AT  2:59 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 W   AT  3:01 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18 WSW AT  2:59 P.M. .
AVERAGE WIND SPEED AND DIRECTION………….11.7 W
ASOS………………….11.4
DAVIS…………………10.5 SW [230 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.76  DEPARTURE……-0.24
ASOS…………..0.78
TOTAL PRECIPITATION FOR THE YEAR……….20.83  DEPARTURE……-2.83
ASOS………….21.22

PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

6/1 71/54/63/+1/0.00/…/..                 26 NE  AERO 30 NE  RMY N/A
6/2 68/54/61/-1/0.00/…/..                 21 NE  AERO 22 NE  RMY 21
6/3 70/57/64/+2/T/…/..                    16 SSW AERO 17 SSW RMY 16
6/4 81/61/71/+8/0.00/…/..                 18 S   AERO 21 S   RMY 20
6/5 67/60/64/+1/0.76/000/00                 32 SSE AERO 36 SSE RMY 34
6/6 80/63/72/+9/0.00/…/..                 26 W   AERO 28 W   RMY 27

6/7 low temp since midnight is 63F; normal low now 55F

* Last of several occurrences

DAILY RECORDS FOR JUNE 2016
None so far

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

RECORDS FOR JUNE 7
HIGH 93F IN 1999
LOW 40F IN 1932
PRECIP 4.01 INS IN 2006
PEAK GUST 58 MPH NE IN 1982

RECORDS FOR JUNE 8
HIGH 94F IN 1984
LOW 37F IN 1932
PRECIP 1.53 INS IN 1947
PEAK GUST 86e MPH WNW IN 1946 [Record for month]

TODAY’S REPORT PREPARED BY: Robert Skilling/Cece Borries-Strigle