September & Yearly 1999
Graphs follow the text summary!
Two new precip records were established at the end of September 1999
at this site. The 21.91" rainfall total in September 1999 produced the
wettest September on record and established a new ALL-TIME monthly precip
rainfall total since records began in 1976. The 21.91" was a whopping 17.27"
above the September normal or 473% of the norm.
FRI, OCTOBER 1, 1999 7:00 AM EDT
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MONTHLY SUMMARY OF CLIMATOLOGICAL DATA - PORTSMOUTH, VIRGINIA
Portsmouth Weather Records Service
Portsmouth, Virginia 23702-2017
(3 miles south / West Cradock Section)
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Monthly summary of Local Climatological Data for Portsmouth,
Virginia, West Cradock Section, during the month of September 1999.
Time is EDT.
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D HT DN LT DN MT DN HDD CDD PREC WD WS WAS SC WXR TYPE/REMARKS
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1 *73 -11 66 -2 69.5 -7 4.5 0.08*N 37 N 12.4 C WINDY, OCNL RA
*NEW MINIMUM MAX TEMP *NEW MAX WIND GUST SPEED
2 74 -10 71 +3 72.5 -4 7.5*0.67 N 28 N 11.1 C BREEZY, SHRA
*NEW DAILY PRECIP RECORD
3 76 -9 72 +2 74.0 -3 9.0 0.57 N 27 N 8.6 C BREEZY, SHRA BR
4 76 -7 73 +5 74.5 -1 9.5*3.55 NE 32 NNE9.2 C BREEZY, +SHRA BR
*NEW DAILY PRECIP RECORD TROPICAL STORM DENNIS
5 82 -1 75 +8 78.5 +3 13.5 0.06 SE 22 SE 6.0 PC SHRA BR
6 81 -3 76 +9 78.5 +3 13.5 0.15 SSE16 SSE5.2 PC SHRA TSRA
7 83 -2 73 +6 78.0 +2 13.0*1.16 S 24 S 3.0 C BR TSRA SHRA
*NEW DAILY PRECIP RECORD
8 86 +4 73 +6 79.5 +5 14.5 0.04 S 15 S 3.7 PC BR SHRA(AM) HZ
9 84 0 74 +8 79.0 +4 14.0 1.52 S 19 S 3.3 PC BR +SHRA TSRA
10 77 -7 70 +4 73.5 -2 8.5*3.19 N 22 N 4.3 PC BR +SHRA TSRA FROPA
*NEW DAILY PRECIP RECORD
11 78 -5 64 -1 71.0 -3 6.0 N 19 N 2.5 SU COOLER DRIER
12 79 -4 60 -4 69.5 -4 4.5 NNE18 N 2.3 PC PLEASANT
13 80 -3 64 0 72.0 -1 7.0 NE 16 NNE2.3 PC BR(AM)
14 77 -5 74 +8 75.5 +2 10.5 0.02 NNE13 NNE3.0 C SHRA -BR
15 76 -6 71 +6 73.5 0 8.5*7.00 NE 24 NNE6.0 C +SHRA DST LTG BR
HURRICANE FLOYD *NEW STATION DAILY PRECIP RECORD FLOODING
16 77 -5 62 -3 69.5 -4 4.5*3.10*WNW60 W 9.5 C +SHRA BR FLOODING
*NEW STATION DAILY PRECIP RECORD *NEW MAX WIND GUST HURRICANE FLOYD
17 73 -8 57 -7 65.0 -8 N 21 N 3.2 SU BREEZY(AM) COOLER
18 74 -7 56 -9 65.0 -8 NNE16 NNE1.8 SU PLEASANT
19 76 -5 59 -5 67.5 -5 2.5 NE 14 NE 1.4 PC
20 79 -1 61 -2 70.0 -2 5.0 SSW14 NNE1.0 PC
21 76 -4 63 0 69.5 -2 4.5 T N 29 S 2.2 PC FROPA -SHRA
22 *64 -15 56 -7 60.0 -11 5.0 T N 29 N 8.2 PC SHRA
*NEW STATION MINIMUM MAX TEMPERATURE
23 74 -3 49 -9 61.5 -6 3.5 N 15 WNW2.4 SU
24 77 +1 55 -4 66.0 -1 1.0 S 14 S 4.3 SU PLEASANT
25 83 +5 59 -2 71.0 +2 6.0 SSW14 S 2.1 -PC BR(AM)
26 82 +2 65 +2 73.5 +2 8.5 NE 13 SE 1.5 PC BR(AM)
27 82 +4 70 +9 76.0 +6 11.0 T SE 11 SE 1.7 PC BR(AM) SHRA
28 79 +2 *70 +10 74.5 +6 9.5 0.39 W 13 SSE1.7 C BR HZ SHRA
*TIE OF MAX MINIMUM TEMPERATURE
29 79 +4 *71 +12 75.0 +8 10.0 T SSE11 SSE2.6 C BR HZ -SHRA
*TIE OF MAX MINIMUM TEMPERATURE
30 74 -1 60 +1 67.0 0 2.0 0.41 N 24 N 5.0 PC SHRA FROPA
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SUMMARY OF SEPTEMBER 1999:
TEMPERATURE:
Monthly mean: High = 77.7 Low = 65.6 Mean = 71.7
Departure < Normal: High = - 3.4 Low = +1.5 Mean = -0.9
Degree Days: Heating = 8.5 Cooling = 208.0
Num er of Days Using: Heating = 2 Cooling = 26
Days with maximum temperature >=100: 0
Days with maximum temperature >= 90: 0
Days with maximum temperature <= 32: 0
Days with minimum temperature <= 32: 0
Days with minimum temperature <= 0: 0
PRECIPITATION:
Total month = 21.91" Departure from Normal = +17.27"
Normal month (to date) = 4.64" or 473%
Average daily = 0.73"
Normal daily = 0.15"
Number of days with measurable precipitation = 15
Year-to-date = 61.89" Departure = +23.71" or 162% of normal
Maximum for September = 21.91" in 1999 -->(Since
Minimum for September = 0.26" in 1978 --> 1976)
Number of days with 0.01" or more: 15 Snowfall
Number of days with 0.10" or more: 11 September total = 0.00"
Number of days with 0.50" or more: 8
Number of days with 1.00" or more: 6 September max = 0.0"
DAILY EXTREMES: Low temperature = 49 on the 23rd
High temperature = 86 on the 8th
Maximum daily precipitation = 7.00" on the 15th
Maximum 24-hour rainfall = 8.89" on the 15th-16th (11AM-11AM)
Maximum barometric pressure = 30.280" on the 28th
Minimum barometric pressure = 28.988" on the 16th
Frozen precip = 0.00"
WIND:
Maximum wind gust = WNW 60 MPH on the 16th
Average wind speed and direction = N 4.3 MPH
NUMBER OF:
Days Cloudy: 10 Days with thunderstorms: 4
Days Partly Cloudy: 15 # of Thunderstorms: 4
Days Clear/Sunny: 5 Days with some type of snowfall: 0
Days with Fog/Ground Fog: 16
Days with Dense Fog: 0
Days with Frost: 0
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YEAR-TO-DATE: (through September 30th, 1999)
Temperatures Degree Days Precipitation
Mean maximum: 72.3 (+0.1) Heating: Aqueous: 61.69" (DEP +23.71") 162%
Mean minimum: 55.4 (+1.8) 1943.5 Maximum monthly: 21.91"/SEP.
Mean monthly: 63.9 (+1.0) Cooling: Minimum monthly: 2.14"/FEB.
1632.0
Highest: 101, July 6
Snowfall: TRACE"
Lowest: 17, January 6 Maximum daily: TRACE" (Jan. 9,10 & Mar. 8)
Days with max temperature >= 90: 43 Maximum monthly: TRACE" (Jan. & Mar.)
Days with max temperature <= 32: 1
Days with min temperature <= 32: 21 Days with some type of
Days with temperature <= 0: 0 snowfall: 8
Days with measurable
Number of: Precipitation: 96 or 35.89%
Days using Heating: 122
Days using Cooling: 147 Days with thunderstorms: 26
Days Cloudy: 70 Number of thunderstorms: 33
Days Partly Cloudy: 153
Days Clear/Sunny: 50 Greatest 24-hour daily rainfall:
Days with fog/ground fog: 99 7.07"/July 24th, 1999
Days with dense fog: 113 Greatest 24-hour period rainfall:
8.89"/September 15th-16th (11AM-11AM)
Wind (Highest Gust): WNW 60 miles per hour, September 16th
Barometer: Highest 30.807" on January 31st
Lowest: 28.988" on September 16th
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METAR DENOTATIONS:
BC Patches
BL Blowing
BR Fog with visibilites > 5/8 but <=6 statute miles and below
to 5/8 mile
DU Dust (widespread)
DS Duststorm
DZ Drizzle
FC Funnel Cloud
FC+ Tornado/waterspout
FG Fog with visibility <= 5/8 statute miles
FU Smoke
FZDZ Freezing drizzle
FZRA Freezing rain
FZFG Freezing fog
GR Hail
GS Small hail
HZ Haze
IC Ice crystals
PE Ice pellets
PY Spray
RA Rain
SA Sand
SS Sandstorm
PO Sand or dust whirls
SG Snow granules
SH Shower
SHRA Shower of rain
SHSN Shower of snow
SHPE Shower of ice pellets
SHGR Shower with hail
SHGS Shower with small hail
SM Statute miles
SN Snow
SQ Squalls
TS Thunderstorm
TSGR Thunderstorm with hail
TSGS Thunderstorm with small hail
TSPE Thunderstorm with ice pellets
TSRA Thunderstorm with rain
TSSN Thunderstorm with snow
UP Unknown precipitation
VA Volcanic ash
VC Vicinity
VV Used for obscurred sky
METAR Qualifiers: (now placed in FRONT of code)
- Light
+ Heavy
DR Low drifting
M Below (as in -x.x degrees)
MI Shallow
PR Partial
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PWRS DENOTATIONS: SU/CL = Clear sky; PC = Partly cloudy sky; C =
cloudy sky; NA, not available; NR, not recorded; TEMP, temperature;
MAX, maximum; MIN, minimum; T, trace of precipitation; INOP,
inoperative equipment; MPH, miles per hour; DN, departure from normal;
DEP, departure; YR, year; NORM, normal; DST LTG, distant lightning;
FROP or FROPA, frontal passage; AM morning; AFT afternoon hours;
EVE evening hours; PM evening hours; E estimated; OCNL, occasional
VBL, variable wind directions; TS, tropical storm; *tied station record
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COLUMN DENOTATIONS:
D Date PREC Precipitation
HT High Temperature WS Maximum Wind Speed (Gust)
LT Low Temperature WD Direction of Maximum Wind Gust
MT Mean Temperature WAS Average Wind Speed & Dominant
Direction
HB High Barometer Reading (Inches)
DN Departure from Normal LB Low Barometer Reading (Inches)
SC Dominant Daily Sky Cover
HDD Heating Degree Days WXR TYPES Observed Weather
CDD Cooling Degree Days Conditions and Remarks
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NOTES: All temperatures are in degrees fahrenheit. All precipita-
tion measurements are in inches. All wind speeds are in miles per
hour.
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