Monday, September 28, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 28, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

MOISTURE ENTERS THE REGION AS WINDS SHIFT DURING
CLEAR OVERNIGHT- SUPERMOON AND ECLIPSE FULLY VISIBLE
-PATTERN TO SHIFT

It appears the long, dry and warm pattern that has characterized
most of September may be nearing its end. Overnight, winds shifted
from the recent preferred direction of NE to the S, as moisture
entered the region. By the 7:00 AM EST observation this morning
patchy fog was visible in the surrounding valleys, with clouds
at varying levels beginning to build from the S and W.

Overnight, extremely clear conditions allowed for fully unimpeded
views of the “Blood Moon” – with a moderate breeze from the S.

With no measurable precipitation in the past couple of weeks,
our monthly deficit has fallen further to 2.27 inches below normal,
and over 7 inches below normal for the year.

By today’s 1:00 PM EST observation stratocumulus, altocumulus and
varying forms of high cirrus were building in the skies overhead.
Hazy conditions had kept visibility to just 40 miles in all
directions, as winds have picked up from the SSW at 9 knots.
A maximum temperature of 80F had been recorded by that time.

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus N-W, few cirrus overhead,
patchy valley fog NE-ESE, thin fog in all directions
Temperature: 62F; Dew Point: 59F; Wind: S at 7 kts,
Sea-level pressure: 30.30 ins. Hg, rising slightly
Visibility: 20 miles, thin fog in all directions
6-hr Max temp: 62F
6-hr Min temp: 57F
24-hr precip: none
BHO SA 1155 CLR 20 261/62/59/1807/030/ FEW SC N-W
FEW CI OVHD PTCHY VLY FG NE-ESE THN FG ALQDS/
8/501 51001 10062 20057

10 A.M.
Weather: Few small cumulus in all directions, few stratocumulus
N-SSW, few cirrus distant S-WNW
Temperature: 72F; Dew Point 61F; Wind: estimated S at 5 kts,
Wind: Light and Variable
Sea-level pressure: 30.29 ins. Hg, steady then decreasing
Visibility: 30 miles, thin fog in all directions
BHO SA 1455 CLR 30 259/72/61/E1705/029/ FEW SML CU ALQDS
FEW SC N-SSW FEW CI DSNT S-WNW THN FG ALQDS WND LGT AND VRB/ 8/801 58002

1 P.M.
Weather: Scattered stratocumulus, scattered altocumulus,
thin broken cirrus, cirrocumulus and dense cirrus
Temperature: 79F; Dew Point: 60F; Wind: SSW at 9 kts
Sea-level pressure: 30.24 ins. Hg, decreasing, then more quickly
Visibility: 40 miles, hazy
6-hr Max: 80F
6-hr Min: 62F
BHO SA 1755 40 SCT 90 SCT E250 -BKN 40 239/79/60/2009/024/
HAZY/ 8/439 58020 10080 20062
SUMMARY FOR SUNDAY, SEPTEMBER 27, 2015

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..67
MIN…..46   NORMAL…..50
MEAN….59   NORMAL…..59

DEPARTURE FROM 30-YEAR NORMAL……………………+0
TOTAL DEPARTURE FOR THE MONTH………………….+123  [+4.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….131   DEPARTURE………+73
TOTAL COOLING UNITS FOR THE SEASON…………797   DEPARTURE……..+202
TOTAL COOLING UNITS LAST SEASON TO DATE…….577   DIFFERENCE…….+220

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………6   DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH…………..41   DEPARTURE………-53
TOTAL HEATING UNITS FOR THE SEASON………….42   DEPARTURE………-77
TOTAL HEATING UNITS LAST SEASON TO DATE……..91   DIFFERENCE……..-49

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….17 S   AT 11:04 P.M.*
ASOS……………………18 S   AT  6:51 P.M.
DAVIS…………………..17 SW  AT  5:35 P.M. RMY 18
FASTEST MILE FOR YESTERDAY……………….. 13 S   AT 11:56 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 S   AT 11:56 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13 SSW AT  6:29 P.M.
AVERAGE WIND SPEED AND DIRECTION…………. .6.0 NNE
ASOS……………………6.9
DAVIS…………………..5.4 S [169 DEG]

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………..1.35  DEPARTURE…..-2.27
ASOS……………1.33
TOTAL PRECIPITATION FOR THE YEAR………..31.60  DEPARTURE…..-7.03
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

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  81/65/73/+5/0.00/766/97               20 SSW RMY 20
9/2  89/64/77/+9/0.00/732/93               20 SW  RMY 21
9/3  85/66/76/+9/T/612/78                  17 E   RMY N/A TSTM
9/4  72/58/65/0/0.00/297/38                31 ENE RMY N/A
9/5  77/55/66/-1/0.00/748/96               14 SW  RMY 18
9/6  87/57/72/+5/0.00/753/97               21 SSW RMY 22
9/7  92/63/78/+12/0.00/727/94              23 WSW RMY 24
9/8  97/70/84/+18/0.00/693/90              22 WSW RMY 24
9/9  92/70/81/+15/0.00/683/89              30 SSW RMY 33
9/10 73/62/68/+3/…./000/00               29 NE  RMY N/A
9/11 70/59/65/0/…./084/11                33 NE  RMY N/A
9/12 75/58/67/2/…./380/50                18 SSE RMY 25
9/13 66/60/63/-1/…./000/00               25 E   RMY N/A
9/14 70/53/62/-2/0.00/550/73               33 W   RMY 35
9/15 82/56/69/+5/0.00/736/98               23 W   RMY N/A
9/16 84/62/73/+10/0.00/711/95              17 NW  RMY N/A
9/17 87/64/76/+13/0.00/723/97              17 SW  RMY 16
9/18 86/64/75/+13/0.00/712/96              21 SSW RMY 21
9/19 80/62/71/+9/0.00/…/..               22 S   RMY N/A
9/20 74/55/65/+3/T/…./…                24 S   RMY N/A
9/21 65/50/58/-3/0.00/…/..               29 ENE RMY 30
9/22 67/55/61/+0/0.00/…/..               21 E   RMY 21
9/23 72/50/61/+1/0.00/…/..               15 E   RMY N/A
9/24 72/56/64/+4/0.00/…/..               22 E   RMY 21
9/25 66/53/60/0/0.00/…/..                21 E   RMY 20
9/26 63/49/56/-3/0.00/…/..               25 ENE RMY 25
9/27 71/46/59/+0/0.00/…/..               17 S   RMY 18

9/28 low since midnight is 57F; normal low is now 50F

DAILY RECORDS FOR SEPTEMBER 2015

**9/7 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
TIES PREVIOUS RECORD SET IN 2007**

**9/8 DAILY RECORD MAXIMUM TEMPERATURE OF 97F
BREAKS PREVIOUS RECORD OF 93F SET IN 2007**

**9/8 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**

**9/9 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
BREAKS PREVIOUS RECORD OF 91F SET IN 2002**

**9/9 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**

**9/17 DAILY RECORD MAXIMUM TEMPERATURE OF 87F
BREAKS PREVIOUS RECORD OF 86F SET IN 1915, 1941, AND 1991**

**9/18 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F
TIES PREVIOUS RECORD SET IN 1992**

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

RECORDS FOR SEPTEMBER 28
HIGH 86F IN 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: Brian Fitzgerald