May 1998
Text summary is followed by graphs!
MON, JUNE 1, 1998 6:45 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 May 1998.
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 67 -8 61 +8 64.0 0 1.0 0.53 N 16 3.5N PC BR -FU SHRA
2 73 -1 59 +6 66.0 +3 1.0 0.09 SW 27 6.3SW PC TSRA BR
3 82 +7 56 +3 69.0 +5 4.0 SSW21 5.2SW PC WARM
4 77 +4 60 +6 68.5 +5 3.5 0.77 SSW24 2.9SSW PC SHRA BR TSRA
5 77 +5 60 +6 68.5 +6 3.5 0.19 S 17 4.2SSW PC BR SHRA TSRA FROPA
6 79 +3 59 +5 69.0 +4 4.0 W 16 2.4NNE PC BR (AM)
7 80 +6 59 +5 69.5 +5 4.5 SSW15 3.3SW PC BR (AM)
8 79 +5 56 +2 67.5 +4 2.5 1.91 NE 39 3.6S PC BR TSRA(2) GR
9 66 -8 59 +6 62.5 -1 2.5 0.03 N 22 6.3N C BR SHRA DZ
10 67 -9 57 +3 62.0 -3 3.0 0.01 N 20 6.1N C BR DZ -SHRA
11 58 -19 54 -1 56.0 -10 9.0 T N 24 9.1N C BR DZ -SHRA
12 57 -20 52 -4 54.5 -12 10.5 0.08 N 27 9.1N C BR DZ -SHRA
13 56 -21 51 -5 53.5 -13 11.5 0.03 N 23 5.7N C BR DZ -SHRA
14 65 -10 50 -7 57.5 -9 7.5 T N 23 6.4N PC BR DZ(AM)
15 80 +3 48 -9 64.0 -3 1.0 N 14 2.4N PC +FG (AM) WARM AFT
16 91 +14 59 +3 75.0 +8 10.0 W 12 3.1SSW SU HOT
17 89 +11 65 +7 77.0 +9 12.0 NE 14 2.0N PC HAZE WARM
18 83 +2 65 +6 74.0 +4 9.0 N 19 3.5N SU HAZE
19 93 +13 62 +3 77.5 +8 12.5 SW 21 4.8SSW SU HOT
20 89 +12 69 +9 79.0 +11 14.0 W 21 4.5W PC -HZ WARM
21 90 +11 67 +7 78.5 +9 13.5 W 22 3.9SW PC HZ FROPA(LATE EVE)
22 77 -1 65 +7 71.0 +3 6.0 N 19 4.9N PC HZ
23 69 -12 56 -3 62.5 -8 2.5 0.18 NE 16 1.6NE C SHRA HZ BR
24 75 -6 54 -7 64.5 -7 0.5 0.02 WSW13 1.7SW PC SHRA HZ WARMFROPA
25 90 +10 65 +4 77.5 +7 12.5 W 21 3.3SW PC HZ HOT
26 83 +5 68 +7 75.5 +6 10.5 0.58 NNE28 3.7N PC TSRA HZ BR FROPA
27 79 +3 66 +7 72.5 +5 7.5 0.11 N 14 3.1NE PC SHRA HZ BR
28 82 +4 66 +7 74.0 +6 9.0 N 13 3.3NNE PC BR HZ
29 88 +6 66 +5 77.0 +6 12.0 SW 18 3.5SW PC BR HZ
30 93 +11 70 +8 81.5 +10 16.5 SW 15 4.4SW PC HZ HOT HUMID
31 91 +7 71 +7 81.0 +7 16.0 SSW22 5.5SSW PC HZ HOT HUMID
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SUMMARY OF MAY 1998:
TEMPERATURE:
Monthly mean: High = 78.2 Low = 60.5 Mean = 69.4
Departure < Normal: High = + 0.8 Low = + 3.2 Mean = + 2.0
Degree Days: Heating = 49.0 Cooling = 184.0
Number of Days Using: Heating = 10 Cooling = 21
Days with maximum temperature >= 90: 6
Days with maximum temperature <= 32: 0
Days with minimum temperature <= 32: 0
Days with minimum temperature <= 0: 0
PRECIPITATION:
Total month = 4.53" Departure from Normal = + 0.52"
Normal month (to date) 4.01" or 113%
Average daily = 0.15"
Normal daily = 0.13"
Number of days with measurable precipitation = 13
Year-to-date = 25.83" Departure = + 6.30" or 132% of normal
Maximum for May = 8.06" in 1988 --> (Since
Minimum for May = 1.02" in 1986 --> (1977)
Number of days with 0.01" or more: 13 Snowfall
Number of days with 0.10" or more: 7 May total = 0.00"
Number of days with 0.50" or more: 4 May max = 0.00" in
Number of days with 1.00" or more: 1 ----
DAILY EXTREMES: Low temperature = 48 on the 15th
High temperature = 93 on the 19th, 30th
Maximum daily precipitation = 1.91" on the 8th
Maximum 24-hour rainfall = 1.91" on the 8th
Maximum wind gust = NE 39 mph on the 8th
Maximum barometric pressure = 30.152" on the 14th
Minimum barometric pressure = 29.436" on the 8th
NUMBER OF:
Days Cloudy: 6 Days with thunderstorms: 5
Days Partly Cloudy: 22 # of Thunderstorms: 6
Days Clear/Sunny: 3 Days with some type of snowfall: 0
Days with Fog/Ground Fog: 18
Days with Dense Fog: 1
Days with Frost: 0
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YEAR-TO-DATE: (through May 31st, 1998)
Temperatures Degree Days Precipitation
Mean maximum: 63.9 (+2.5) Heating: Aqueous: 25.83" (DEP +6.30") 132%
Mean minimum: 46.9 (+4.8) 1727.0 Maximum monthly: 7.60"/FEB.
Mean monthly: 55.4 (+3.7) Cooling: Minimum monthly: 3.90"/MAR.
284.0
Highest: 93, May 19, 30
Snowfall: 0.00"
Lowest: 24, January 1 Maximum daily: 0.00"
Days with max temperature >= 90: 6 Maximum monthly: 0.00"
Days with max temperature <= 32: 0
Days with min temperature <= 32: 13 Days with some type of
Days with temperature <= 0: 0 snowfall: 2
Days with measurable
Number of: precipitation: 55 or 36.4%
Days using Heating: 111
Days using Cooling: 39 Days with thunderstorms: 10
Days Cloudy: 35 Number of thunderstorms: 11
Days Partly Cloudy: 85
Days Clear/Sunny: 31 Greatest 24-hour period
Days with fog/ground fog: 70 rainfall: 3.86"/FEB. 4th
Wind (Highest Gust): SE 53 miles per hour, January 27th
Barometer: Highest 30.667" on January 1st
Lowest: 29.198" on February 4th
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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;
VBL, variable wind directions; TS, tropical storm
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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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