BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 14, 2009 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
WEEKEND RAINFALL EVENT LEAVES 2.29 INCHES HERE
BUT OVER 4 INCHES TO OUR EAST AND SOUTHEAST
AS DRY SPELL SINCE AUGUST 29TH COMES TO AN END
 
The heavy rainfall event which began last Friday
afternoon, 11 September and ended during the
early hours of Sunday, 13 September left 2.29
inches of rainfall here at Blue Hill. The
heaviest rate of fall occurred between 9 and 11 a.m.
EDT on Saturday morning when over one half
inch was recorded in two hours.  The rain was
much heavier to our east and southeast over
Plymouth county where Hingham had 4.82 inches
while there were reports of 5 to 6 inches
farther to the south for the event total.
 
The rainfall marked the end of nearly two weeks
of dry weather since 28-29 August when very
heavy rainfall was recorded in much of the
same area of southeastern Massachusetts.
 
Today's observations:
 
7 A.M.  
Weather: Thin broken cirrus
Temperature: 58F, Dew point: 53F, Wind: W at 9 kts
Sea-level pressure: 29.91 inches Hg, rising
Visibility: 55 miles, 70 miles northwest
6-hour minimum temp: 55F
24-hour precipitation: 0.00 
BHO SA 1155 250 –SCT 300 –BKN 55 128/58/53/2709/991/
FEW LWR CI VSBY NW 70 LGT DSNT HZ/ 8/001 53011
10058 20055
 
10 A.M.
Weather: Thin scattered cirrus, few small cumulus forming
distant ESE-S and distant SW-W, few altocumulus distant west
Temperature: 67F, Dew point: 51F, Wind: W at 10 kts,
Wind: direction variable WSW-WNW
Sea-level pressure: 29.91 inches Hg, falling
Visibility: 80 miles
BHO SA 1455 300 –SCT 80 128/67/51/2610/991/ FEW SML CU FRMG DSNT
ESE-S AND DSNT SW-W FEW AC DSNT W FEW LWR CI WND 24V30/ 8/101 58000
 
1 P.M.
Weather: Thin scattered cirrus, few cumulus distant WNW-NW,
altocumulus distant WNW-NE, few altocumulus castellanus
distant northeast 
Temperature: 73F, Dew point: 51F, Wind: W at 8 kts,
Wind: direction variable SW to WNW 
Sea-level pressure: 29.88 inches Hg, falling
Visibility: 80 miles, 90 miles northwest
6-hour max. temp: 73F
BHO SA 1755 300 –SCT 80 120/73/51/2608/988/ FEW SML CU DSNT WNW-NW 
AC DSNT WNW-NE FEW ACC DSNT NE LWR CI DSNT S-SW VSBY NW 90
WND 23V30/ 8/181 58008 10073 20058
 
WEATHER SUMMARY FOR SUNDAY, SEPTEMBER 13
 
TEMPERATURE (DEGREES F)
MAX.....76    NORMAL.....72
MIN.....58    NORMAL.....54
MEAN....67    NORMAL.....63
 
DEPARTURE FROM 30-YEAR AVERAGE...........+4
TOTAL DEPARTURE FOR THE MONTH...........-17 [-1.5 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............0  DEPARTURE.......-4
TOTAL HEATING UNITS FOR THE MONTH............33  DEPARTURE.......-3
TOTAL HEATING UNITS FOR THE SEASON...........67  DEPARTURE........0
TOTAL HEATING UNITS LAST SEASON TO DATE......30  DIFFERENCE.....+37
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............28 NW   AT  5:56 P.M.   
                   AEROVANE..............28 NW   AT  5:56 P.M.  
                   ASOS..................26 WNW  AT  5:47 P.M.   
                   DAVIS................ 28 WMW  AT  5:47 P.M.   
FASTEST MILE FOR YESTERDAY...............17 NW   AT  5:56 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............17 NW   AT  5:57 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........20 WNW  AT  5:56 P.M.   
AVERAGE WIND SPEED AND DIRECTION....... 8.7 NW
                   ASOS................ 8.8
                   DAVIS................8.8 NW [320 DEG]
 
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 MONTH..............2.29   DEPARTURE....+0.54
                         ASOS..............2.33
TOTAL PRECIPITATION FOR THE YEAR..........37.06   DEPARTURE....+1.84
                         ASOS.............38.25
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
9/1  71/51/61/-6/0/773/98     17 NW
9/2  76/54/65/-1/0/786/100    22 S
9/3  77/56/67/+1/0/587/75     19 SW
9/4  77/60/69/+3/0/764/98     18 NE
9/5  81/59/70/+5/0/591/76     25 NNW
9/6  64/53/59/-6/0/743/96     31 NNE
9/7  70/52/61/-4/0/709/92     20 WSW
9/8  75/56/66/+1/0/369/48     18 WSW  
9/9  68/55/62/-2/0/352/46     36 NNE  AERO 33 MPH NNE
9/10 65/53/59/-5/0/603/79     31 ENE
9/11 61/54/58/-6/.../0/0      30 NE
9/12 63/60/61/-1/.../0/0      30 NNE
9/13 76/58/67/+4/.../.../..   28 NW 
 
9/14 our morning low temp: 55F; the normal low is now 54F
 
NEW DAILY RECORDS FOR SEPTEMBER 2009 TO DATE...
None.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)
 
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)
 
TODAY'S REPORT PREPARED BY: Robert Skilling