Daily Discussion

| July 31, 2013 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 31, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME

CONTINUED BEAUTIFUL WARM, DRY WEATHER
SUNSHINE, DRY AND VERY CLOSE TO NORMAL TEMPS. TO END JULY
JULY AVERAGE TEMPERATURE DEPARTURE DECREASES TO NEAR +3.5F

Today is a second day of beautiful sunny to partly sunny warm
and dry late July weather.  Temperatures have reached 80F
with dew points in the upper 50’s.  Today will make 5 days
in a row with very close to normal temperatures.  This comes
after a very warm July which is averaging 3.6 degrees
warmer than average over 30 days.

The near normal temperatures these past days have continued
to lower what has been a large positive monthly temperature
departure down to less than 4 degrees above the 30-year average.

BHO Greatest Number of 90-Degree Days per Month, (1885-2013)
1) 14 in July 1952
2) 13 in August 2002
3) 10 in August 1944
10 in July 1949
10 in July 1963
10 in July 2010
10 in July 2013 (through 7/29)
8)  9 in July 1911
9 in August 1928
10) 8 in August 1949
8 in July 1963
8 in July 1988

Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus lenticularis NE-E, patch of
altocumulus translucidus ESE, thin cirrus radiatus distant S-W
Temperature: 67F; Dew Point: 60F; Wind: N at 7 kts,
Wind: Direction gradually veering
Sea-level pressure: 30.15 ins. Hg, rising then more slowly
Visibility: 55 miles, distant haze
6-hr min. temp: 61F
BHO SA 1155 CLR 55 147/67/60/3507/015/ FEW ACSL NE-E PTCH AC ESE
THN CI DSNT S-W THN K LYR ALF DSNT WNW-NW DSNT HZ WND GRDL VEERING/
8/041 51012 10067 20061

10 A.M.
Weather: Thin scattered cirrus, 2 levels, cumulus forming mostly
distant SE-SW and few small cumulus forming over city N
Temperature: 75F; Dew Point: 56F; Wind: NNE at 2 kts, estimated
Wind: Light and estimated from NNE
Sea-level pressure: 30.14 ins. Hg, falling slightly
Visibility: 65 miles, light distant haze
BHO SA 1455 250 –SCT 300 –SCT 65 205/75/56/E0302/014/ CU FRMG MSTLY
DSNT SE-SW FEW SML CU FRMG OVR CTY N LGT DSNT HZ WND LGT/
8/101 58004

1 P.M.
Weather: Broken cumulus/moderate cumulus, dark bases,
cumulus except distant NE-ESE, broken and overcast cirrus
layers thin, break in overcast
Temperature: 78F; Dew Point: 59F; Wind: W at 2 kts, estimated
Wind: Direction light
Sea-level pressure: 30.11 ins. Hg, falling then more slowly
Visibility: 65 miles, except 70 miles NW, light distant haze
6-hr max. temp: 80F
BHO SA 1755 E45 BKN 250 BKN 300 OVC 65 197/78/59/E2802/011
/ CU/MDT CU
DRK BASES ALQDS XCPT DSNT NE-ESE CI LYRS THN BINOVC VSBY NW 70
LGT DSNT HZ WND LGT/ 8/201 56008 10080 20067

WEATHER SUMMARY FOR TUESDAY, JULY 30, 2013

TEMPERATURE (DEGREES F)
MAX…..81     NORMAL…..81
MIN…..61     NORMAL…..63
MEAN….71     NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….-1
TOTAL DEPARTURE FOR THE MONTH………………..+113 [+3.6 DEGREES/DAY]

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………….20 WNW AT 12:46 P.M. *
AERO…………………18 WNW AT 12:46 P.M.
ASOS…………………20 W   AT 12:47 P.M.
DAVIS………………..18 WNW AT  5:36 A.M.
……..18 WNW AT 12-1  P.M. RMY 20
FASTEST MILE FOR YESTERDAY………………13 WNW AT 12:44 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE……………14 WNW AT 12:48 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………..14 WNW AT  5:38 A.M.
AVERAGE WIND SPEED AND DIRECTION………..9.7 WNW
ASOS………………..8.7
DAVIS……………….8.5 WNW [300 deg.]
* last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00   DEPARTURE…………-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.09   DEPARTURE…………-0.78
ASOS…………..3.05
TOTAL PRECIPITATION FOR THE YEAR……….35.29   DEPARTURE…………+4.45
ASOS…………..N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals

PRELIMINARY CLIMATE SUMMARY FOR JULY 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized

7/1  82/69/76/+6/0.05/247/27         29 S   AERO 31 MPH SSW RMY 32
7/2  82/61/72/+2/T/100/11            23 SSW AERO 23 MPH SSW RMY 25
7/3  87/62/75/+4/T/556/61            28 SW  AERO 30 MPH SW  RMY 30
7/4  90/71/81/+10/0.00/811/89        25 WSW AERO 26 MPH SW  RMY 28
7/5  92/73/83/+12/0.00/874/96        24 W   AERO 25 MPH WSW RMY 25
7/6  90/73/82/+11/0.00/836/92        25 WNW AERO 25 MPH WNW RMY 26
7/7  91/72/82/+11/0.21/508/56        38 SSW AERO 43 MPH SSW RMY 44  TSTM
7/8  82/64/73/+1/0.04/617/68         18 NE  AERO 20 MPH NE  RMY 20  TSTM
7/9  72/63/68/-4/0.01/054/06         14 ENE AERO 14 MPH ENE RMY 14
7/10 84/65/75/+3/T/335/37            32 S   AERO 36 MPH S   RMY 35
7/11 79/69/74/+2/0.62/009/01         23 W   AERO 23 MPH W   RMY N/A TSTM
7/12 70/62/66/-6/0.00/162/18         29 NE  AERO 29 MPH NE  RMY 30
7/13 75/62/69/-3/0.08/009/01         21 ENE AERO 20 MPH ENE RMY N/A
7/14 89/71/80/+8/0.00/477/53         16 W   AERO 16 MPH W   RMY 16
7/15 91/72/82/+10/0.00/665/74        17 NW  AERO 16 MPH NW  RMY 18
7/16 91/71/81/+9/0.00/843/94         18 NNW AERO 16 MPH NNW RMY 16
7/17 93/74/84/+12/0.00/841/94        22 SW  AERO 23 MPH SW  RMY 25
7/18 90/75/83/+11/0.00/724/81        20 S   AERO 21 MPH S   RMY 22
7/19 95/76/86/+14/0.00/723/81        36 WSW AERO 38 MPH WSW RMY 38
7/20 93/72/82/+10/0.00/570/64        29 W   AERO 30 MPH W   RMY 31  TSTM
7/21 82/68/75/+3/0.00/568/64         16 NE  AERO 16 MPH NE  RMY 17
7/22 80/67/74/+2/T/514/58            17 NE  AERO 17 MPH NE  RMY 19  TSTM
7/23 82/68/75/+3/0.82/159/18         35 WSW AERO 36 MPH WSW RMY 39
7/24 84/64/74/+2/0.00/627/71         23 N   AERO 23 MPH N   RMY 23
7/25 64/57/61/-11/0.43/000/00        24 NNE AERO 24 MPH NNE RMY 25
7/26 67/59/63/-9/0.70/000/00         23 NNW AERO 23 MPH N   RMY 23
7/27 82/60/71/-1/0.00/535/61         22 S   AERO 23 MPH S   RMY 23
7/28 78/66/72/0/0.03/149/17          16 ENE AERO 16 MPH ENE RMY 15
7/29 81/66/74/+2/0.10/…/..         20 S   AERO 18 MPH S   RMY 21  TSTM
7/30 81/61/71/-1/0.00/…/..         20 WNW AERO 18 MPH WNW RMY 20

7/31 morning low temp: 61F; the normal low is now 63F

DAILY RECORDS FOR JULY 2013
7/14 – TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F;
ties previous record of 71F set in 1997
7/15 – NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F;
surpasses previous record of 70F set in 1901, 1934, 1995
7/16 – TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F;
ties previous record of 71F set in 1901, 1958, 1968
7/17 – TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F;
ties previous record of 74F set in 1900
7/18 – NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F;
surpasses previous record of 73F set in 1900, 1999
7/19 – NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F;
surpasses previous record of 72F set in 1949, 1991, 2005

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

RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895,1918
PRECIP 1.34 INCHES IN 1892
PEAK GUST 43e MPH WNW IN 1953, 43 SW IN 1971

RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985

TODAY’S REPORT PREPARED BY: Robert Skilling/Marc Douglas

Category: Daily Discussions

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