Sunday, September 28, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 28, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

RECORD HIGH TEMPERATURES OCCURRING; TIED YESTERDAY
AND SURPASSED TODAY AS READINGS RISE INTO THE 80’S
MODERATE DROUGHT NOW IN PLACE AT BLUE HILL,
SEPTEMBER APPEARS LIKELY TO ENTER THE RECORD BOOK

The maximum temperature of 84F yesterday equaled the
record for September 27 set in 1998.
Today’s record high temperature of 82F in 1959 was
being equaled by noon and being surpassed this
afternoon.

Blue Hill, along with much of South Shore Massachusetts,
Rhode Island and coastal Connecticut are now in moderate
drought, according to the National Drought Mitigation Center,
whose Drought Monitor is available through their website.

Like yesterday, completely clear skies were observed through this morning
with no clouds visible in any direction at either the
7:00 AM or 10:00 AM EST observations. Hazy conditions have lowered
the visibility from the 50 to 60 miles of yesterday to 30 to 45 miles
so far today.

HERE AT BLUE HILL…
Only 0.26 inches of precipitation has been recorded for
the month of September with only a few days left in the month.
The driest September on record of 0.45 inches, back in 1914, may
be in jeopardy depending on what rain may fall through next
Tuesday. The monthly precipitation deficit is now down to -3.36
inches, along with an annual deficit that is now -7.20 inches.
Like August, September has been another very sunny month with
the percentage of possible sunshine up close to 70%.

Today’s Observations:

7 A.M.
Weather: Sky Clear, SKC
Temperature: 67F; Dew Point: 59F; Wind: WSW at 6 kts,
Sea-level pressure: 30.17 ins. Hg, rising slightly
Visibility: 20 miles, thin fog below dissipating inversion,
hazy, visibility 45 miles WNW above inversion
6-hr max temp: 67F
6-hr min temp: 63F
24-hr precip: 0.00
BHO SA 1155 CLR 25 218/67/59/2406/017/ SKC THN F/HAZY ALQDS
AND INVSN DSSPTNG HAZY VSBY WNW 45 ABV INVSN/ 8/000 53004
10067 20063

10 A.M.
Weather: Sky Clear, SKC
Temperature: 78F; Dew Point: 59F; Wind: WSW at 7 kts
Sea-level pressure: 30.14 ins. Hg, falling then more quickly
Visibility: 30 miles, except WNW 45 miles, hazy all quadrants
BHO SA 1455 CLR 30 205/78/59/2407/014/ SKC VSBY WNW 45 HAZY
ALQDS/ 8/000 58013

1 P.M.
Weather:  Clear, cirrus/cirrus layer distant SW-NW
Temperature: 85F; Dew Point: 60F; Wind: W at 8 kts,
Wind Direction: Variable SSW-WNW
Sea-level pressure: 30.07 ins. Hg, falling then more quickly
Visibility: 35 miles, except 45 miles WNW, hazy
BHO SA 1755 CLR 35 184/85/60/2608/007/ CI/CI LYR DSNT SW-NW
VSBY WNW 45 HAZY ALQDS WND 21V29/ 8/005 58021 10085 20067
6-hr max temp: 85F
6-hr min temp: 67F
6-hr precip: none

WEATHER SUMMARY FOR SATURDAY, SEPTEMBER 27, 2014

TEMPERATURE (DEGREES F)
MAX…..84    NORMAL…..67
MIN…..58    NORMAL…..50
MEAN….71    NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL……………………+12
TOTAL DEPARTURE FOR THE MONTH……………………+43 [+1.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..6   DEPARTURE………..+5
TOTAL COOLING UNITS FOR THE MONTH………….98   DEPARTURE……….+40
TOTAL COOLING UNITS FOR THE SEASON………..577   DEPARTURE……….-18
TOTAL COOLING UNITS LAST SEASON TO DATE……696   DIFFERENCE……..-119

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0  DEPARTURE……….-7
TOTAL HEATING UNITS FOR THE MONTH…………..89  DEPARTURE……….-5
TOTAL HEATING UNITS FOR THE SEASON………….91  DEPARTURE………-28
TOTAL HEATING UNITS LAST SEASON TO DATE…….128 DIFFERENCE………-37

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………17 NNW AT  3:06 A,N,
ASOS…………………..17 N   AT  3:06 A.M.
DAVIS………………….15 NNW AT  3:06 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………..12 NNW AT  3:32 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..14 NNW AT  4:07 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….12 NNW AT  3:32 A.M.
AVERAGE WIND SPEED AND DIRECTION………….7.3 NNW
ASOS………………….7.4
DAVIS…………………6.3 NW (310 degrees)
* last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……….-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.26  DEPARTURE……….-3.36
ASOS…………..0.23
TOTAL PRECIPITATION FOR THE YEAR……….31.44  DEPARTURE……….-7.20
ASOS………….31.66

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 71/58/65/0/0.00/329/43               20 NE  RMY 20
9/11 78/60/69/+4/0.00/099/13              31 SW  RMY 35
9/12 72/51/62/-3/0.00/735/97              25 NNW RMY 22
9/13 67/50/59/-5/0.17/159/21              23 E   RMY 24
9/14 66/47/57/-7/0.00/685/91              25 NW  RMY 24
9/15 67/43/55/-9/0.00/698/93              17 W   RMY 18
9/16 66/52/59/-4/T/030/04                 16 SW  RMY 16
9/17 72/50/61/-2/0.00/722/98              16 NW  RMY 17
9/18 74/52/63/+1/0.00/578/78              21 N   RMY 23
9/19 56/43/50/-12/0.00/702/95             21 NE  RMY 23
9/20 71/45/58/-4/T/515/70                 29 S   RMY 30
9/21 80/61/71/+10/0.06/176/24             26 SSE RMY 27
9/22 72/48/60/-1/0.00/701/96              33 W   RMY 35
9/23 70/44/57/-3/0.00/712/98              20 W   RMY 20
9/24 69/52/61/+1/0.00/543/75              21 NE  RMY 21
9/25 59/52/56/-4/0.00/000/00              20 NE  RMY 19
9/26 73/52/63/+4/0.00/654/91              19 NNE RMY 19
9/27 84/58/71/+12/0.00/…/..             17 NNW RMY N/A

9/28 morning low temp: 63F since midnight; normal low now 50F

DAILY RECORDS FOR SEPTEMBER 2014:
9/27 – Maximum temperature of 84F;
equaled record high maximum set in 1998

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

RECORDS FOR SEPTEMBER 28
HIGH 82F IN 1959, 2014
LOW 33F IN 1897,1947
PRECIP 2.46 INCHES IN 2004
PEAK GUST 69 MPH NE IN 1962

RECORDS FOR SEPTEMBER 29
HIGH 85F IN 1952
LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD)
PRECIP 2.61 INCHES IN 1907
PEAK GUST 62 MPH S IN 2005

TODAY’S REPORT PREPARED BY: Robert Skilling