Monday, September 15, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 15, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

MERCURY DIPS TO 43F OVERNIGHT, WHILE SUNDAY
MAXES OUT AT 66F

After a chilly morning of only 43F, temperatures
have increased into the low to mid 60s by mid morning
with low cumulus and stratocumulus building at times.
Today’s normal morning low is 55F.

By the 1:00 PM EST observation a maximum of 65F had
been reached with a single broken layer of stratocumulus
at approximately 4,400 feet. Visibility was good at
75 miles in all directions.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus fibratus, few stratocumulus
distant in all directions
Temperature: 51; Dew Point: 44F; Wind: NNE at 8 kts
Sea-level pressure: 30.24 ins. Hg, rising then more slowly
Visibility: 50 miles, light distant haze
6-hr max temp: 51F
6-hr min temp: 43F
24-hr precip: 0.00 in.
BHO SA 1155 250 SCT 50 242/51/44/0308/024/ FEW SC DSNT ALQDS
LGT DSNT HZ ALQDS/ 8/501 50005 10051 20043

10 A.M.
Weather: Scattered cirrus fibratus, few cumulus in
all directions, few altocumulus distant distant NW-ENE
Temperature: 62F; Dew Point: 43F; Wind: estimated NNW at 4 kts
Wind Speed: Light
Sea-level pressure: 30.23 ins. Hg, steady then falling
Visibility: 70 miles
BHO SA 1455 250 SCT 70 238/62/43/E3304/023/ FEW CU ALQDS FEW AC
DSNT NW-ENE WND LGT/ 8/131 58004

1 P.M.
Weather: Broken stratocumulus
Temperature: 63F; Dew Point: 46F; Wind: estimated SW at 4 kts
Wind Speed: Light
Sea-level pressure: 30.18 ins. Hg, falling, then more quickly
Visibility: 75 miles
6-hr max temp: 65
6-hr min temp: 51
BHO SA 1755 E44 BKN 75 220/63/46/E2104/018/ WND LGT/ 8/400 58018
10065 20051

WEATHER SUMMARY FOR SUNDAY, SEPTEMBER 14, 2014

TEMPERATURE (DEGREES F)
MAX…..66    NORMAL…..72
MIN…..47    NORMAL…..55
MEAN….57    NORMAL…..64

DEPARTURE FROM 30-YEAR NORMAL…………………….-7
TOTAL DEPARTURE FOR THE MONTH……………………+54 [+3.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE………..-2
TOTAL COOLING UNITS FOR THE MONTH………….86   DEPARTURE……….+45
TOTAL COOLING UNITS FOR THE SEASON………..565   DEPARTURE……….-13
TOTAL COOLING UNITS LAST SEASON TO DATE……694   DIFFERENCE……..-129

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………8  DEPARTURE……….+5
TOTAL HEATING UNITS FOR THE MONTH…………..17  DEPARTURE………-11
TOTAL HEATING UNITS FOR THE SEASON………….19  DEPARTURE………-34
TOTAL HEATING UNITS LAST SEASON TO DATE……..41  DIFFERENCE……..-22

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………25 NW  AT  8:17 A.M. *
ASOS…………………..27 NW  AT  5:49 A.M.
DAVIS………………….22 NW  AT  5:49 A.M. RMY 24
FASTEST MILE FOR YESTERDAY………………..18 NW  AT  8:15 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..17 NW  AT  9:23 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….16 WNW AT  9:24 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.3 NW
ASOS…………………..9.2
DAVIS………………….N/A
* last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……….-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.20  DEPARTURE……….-1.55
ASOS…………..0.18
TOTAL PRECIPITATION FOR THE YEAR……….31.38  DEPARTURE……….-5.39
ASOS………….31.61

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1  88/69/79/+11/0.00/710/90             16 W   RMY 19
9/2  91/70/81/+13/0.00/495/63             24 S   RMY 27 TSTM
9/3  83/67/75/+8/0.00/681/87              24 NW  RMY 27
9/4  86/61/74/+7/0.00/758/97              20 SW  RMY 22
9/5  89/66/78/+11/0.00/731/94             25 SSW RMY 29
9/6  90/67/79/+12/T/481/62                33 SSW RMY 36 TSTM
9/7  77/62/70/+4/0.03/687/89              26 NW  RMY N/A
9/8  74/57/66/+0/0.00/601/78              25 ENE RMY 25
9/9  71/59/65/-1/0.00/384/50              23 ENE RMY 23
9/10 71/58/65/0/0.00/…/..               20 NE  RMY 20
9/11 78/60/69/+4/0.00/…/..               31 SW  RMY 35
9/12 72/51/62/-3/0.00/…/..              25 NNW RMY 22
9/13 67/50/59/-5/0.17/…/..              23 E   RMY 24
9/14 66/47/57/-7/0.00/…/..              25 NW  RMY 24

9/15  morning low temp: 43F since midnight; normal low now 55F

DAILY RECORDS FOR SEPTEMBER 2014:
None so far.

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

RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New England on 9/15/1904 passing east of BHO and bringing a storm total of 4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW, WSW IN 1944 (In the wake of Great Atlantic Hurricane)

RECORDS FOR SEPTEMBER 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999

TODAY’S REPORT PREPARED BY: Brian Fitzgerald