Monday, September 29, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 29, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

YESTERDAY’S DAILY RECORD MAXIMUM TEMPERATURE BROKEN,
MODERATE DROUGHT CONTINUES, REPORTS OF BRUSH FIRE

The maximum temperature of 84F Saturday equaled the
record for September 27 set in 1998.
Yesterday’s record high temperature of 82F in 1959 was
broken in the late afternoon at 86F.

High altocumulus, altostratus and cirrostratus have moved
into the region overnight, with an inversion to start the
morning. Visibility has been quite poor along with layers
of smoke visible at times throughout the morning along with
light winds. A back door cold front is expected later today
potentially bringing fog to the summit.

A brush fire was burning this morning after the 7:00 AM EST
with smoke spotted on the north side of Great Blue Hill.
Milton Fire Department responded to several reports and
were able to extinguish the fire after two separate visits
to the scene just off the Red Dot Trail. As NE winds pick
up this afternoon, threats for uncontrolled brush fires
remain at very high levels.

DROUGHT 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 tomorrow.
The monthly precipitation deficit is now down to -3.50
inches, along with an annual deficit that is now -7.34 inches.
Like August, September has been another very sunny month with
the percentage of possible sunshine up close to 70%.

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.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 65F; Dew Point: 59F; Wind: estimated WNW at 5 kts,
Wind Speed: Light
Sea-level pressure: 29.99 ins. Hg, rising slightly
Visibility: 50 miles, thin fog below dissipating inversion,
visibility 50 miles above inversion, smoke layer below
station distant N-ENE
6-hr max temp: 65F
6-hr min temp: 61F
24-hr precip: 0.00
BHO SA 1155 160 SCT E250 BKN 50 155/65/59/E3005/999/
THN FG BLO STA ALQDS K LYR BLO STA DSNT N-ENE WND LGT/
8/076 53002 10065 20061

10 A.M.
Weather: Broken altocumulus, broken cirrostratus
Temperature: 69F; Dew Point: 58F; Wind: estimated N at 3 kts
Wind Speed: Light
Sea-level pressure: 30.00 ins. Hg, rising slightly
Visibility: 25 miles, hazy in all directions, dark smoke
layer WSW-N
BHO SA 1455 E150 BKN 250 BKN 25 158/69/58/E0103/000/
DRK K LYR WSW-N HAZY ALQDS WND LGT/ 8/076 51003

1 P.M.
Weather: Scattered altocumulus, broken cirrostratus,
few cumulus distant W, few altocumulus lenticularis distant
WSW-ENE
Temperature: 70F; Dew Point: 57F; Wind: NE at 8 kts,
Sea-level pressure: 29.98 ins. Hg, steady then fallings
Visibility: 30 miles, hazy
6-hr max temp: 75F
6-hr min temp: 65F
6-hr precip: none
BHO SA 1755 140 SCT E250 BKN 30 153/70/57/0308/998/
FEW CU DSNT W FEW ACSL DSNT WSW-ENE HAZY ALQDS/
8/076 58005 10075 20065

WEATHER SUMMARY FOR SUNDAY, SEPTEMBER 28, 2014

TEMPERATURE (DEGREES F)
MAX…..86    NORMAL…..67
MIN…..63    NORMAL…..50
MEAN….75    NORMAL…..58

DEPARTURE FROM 30-YEAR NORMAL……………………+17
TOTAL DEPARTURE FOR THE MONTH……………………+60 [+1.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………….10   DEPARTURE………..+9
TOTAL COOLING UNITS FOR THE MONTH…………108   DEPARTURE……….+49
TOTAL COOLING UNITS FOR THE SEASON………..587   DEPARTURE………..-9
TOTAL COOLING UNITS LAST SEASON TO DATE……696   DIFFERENCE……..-109

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0  DEPARTURE……….-7
TOTAL HEATING UNITS FOR THE MONTH…………..89  DEPARTURE………-12
TOTAL HEATING UNITS FOR THE SEASON………….91  DEPARTURE………-35
TOTAL HEATING UNITS LAST SEASON TO DATE…….132 DIFFERENCE………-41

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………17 SW  AT 11:08 P.M.
ASOS…………………..18 SSW AT  2:48 P.M.
DAVIS………………….18 W   AT 12:37 P.M. RMY 18
FASTEST MILE FOR YESTERDAY………………..14 SW  AT 10:20 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..14 SSW AT 10:34 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….13 SW  AT 10:21 P.M.
AVERAGE WIND SPEED AND DIRECTION………….7.4 SW
ASOS………………….7.6
DAVIS…………………6.1 WSW (240 degrees)
* 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……….0.26  DEPARTURE……….-3.50
ASOS…………..0.23
TOTAL PRECIPITATION FOR THE YEAR……….31.44  DEPARTURE……….-7.34
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 86/63/75/+17/0.00/…/..             17 SW  RMY 18

9/29 morning low temp: 62F since midnight; normal low now 49F

DAILY RECORDS FOR SEPTEMBER 2014:
9/27 – Maximum temperature of 84F;
equaled record high maximum set in 1998
9/28 – Maximum temperature of 86F;
surpassed record high maximum of 82F set in 1959

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

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

RECORDS FOR SEPTEMBER 30
HIGH 84F IN 1986
LOW 31F IN 1992
PRECIP 1.93 INCHES IN 1946
PEAK GUST 58 MPH SSE IN 1999

TODAY’S REPORT PREPARED BY: Brian Fitzgerald