LOCOARC Lowndes County Amateur

LOCOARC
Lowndes County Amateur Radio Club

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Equipment List

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Useful Charts

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Useful Charts and conversions:

The following conversion scripts courtesy of Tim Brice and Todd Hall of the National Weather Service in El Paso, TX;

Wind Speed Conversion
Enter a wind speed:
	Answers:
mph	mph
knots	knots
m/s	m/s
ft/s	ft/s
km/h	km/h

Relative Humidity to Dewpoint Conversion
Enter temperature, relative humidity, and actual station pressure:
Temperature:	wet-bulb	unit	dewpoint
° F ° C ° Kelvin		° F
RH:		° C
%		° Kelvin
Enter your actual station pressure:
in HG mm HG mb (hPA)

Pressure Unit Conversion
Enter an atmospheric pressure:
	Answers:
in HG	in HG
mm HG	mm HG
millibars	millibars
hPA	hPA
kPA	kPA
lbs psi	lbs psi

Altimeter Setting
Enter the elevation of the station and choose your units:	Altimeter Setting in in. of HG:
feet meters	in HG
Enter your station pressure (not the altimeter setting) and choose your units:	Altimeter Setting in mm of HG:
in HG mm HG millibars (hPA)	mm HG
	Altimeter Setting in mb. (hPa):
	mb (hPA)

Heat Index
Enter a temperature:
Enter a temperature that you would like and choose your units:	What the temperature feels like to your body:
Fahrenheit Celsius	° F
Enter your relative humidity:
%	° C

WIND STRENGTH CHART:

Reporting Terms	Wind M.P.H	Specifications for Use on Land	Weather Forecast Terms
Calm	Under 1	Smoke rises vertically	Light
Slight Breeze	4 - 7	Direction of wind shown by smoke drift, but not by wind vanes	Light
Gentle Breeze	8 - 12	Leaves & small twigs in constant motion; light flags extended	Gentle
Moderate Breeze	13 - 18	Raises dust & loose paper; small branches move	Moderate
Fresh Breeze	19 - 24	Sm. trees in leaf begin to sway; crested wavelets on inland water	Fresh
Strong Breeze	25 - 31	Large branches in motion; whistling heard in telephone wires	Strong
High Breeze	32 - 38	Whole trees in motion; inconvenience in walking against wind	Strong
Gale	39 - 46	Breaks twigs off trees; generally impedes progress	Gale
Strong Gale	47 - 54	Slight structural damage occurs	Whole Gale
Whole Gale	55 - 63	Seldom experienced inland, tree uprooted; much damage occurs	Whole Gale
Storm	64 - 75	Very rarely experienced; accompanied by widespread damage	Whole Gale
Hurricane	75+		Hurricane

FUJITA SCALE FOR TORNADOS:
-------------------------

Scale Number   Wind Speed (mph/[kph])     Damage Type
_____________________________________________________

    F0                   40- 73   [ 64-117]               Light

    F1                   74-112   [118-180]             Moderate

    F2                   113-157   [181-251]           Considerable

    F3                   158-206   [252-330]           Severe

    F4                   207-260   [331-417]           Devastating

    F5                   more than 261+ [418+]      Incredible

HAIL SIZE ESTIMATE COMPARISON CHART:

Pea...................0.25 inches;
Penny.................0.75 inches;
Quarter...............1.00 inches;
Half Dollar...........1.25 inches;
Golf ball...............1.75 inches
Tennis ball............2.50 inches
Baseball...............2.75 inches
Grapefruit.............4.00 inches
(Borrowed from the NOAA/NWS publication, ADVANCED SPOTTER'S FIELD GUIDE.)

Saffir-Simpson Scale:

	Maximum Sustained Winds		Barometric Pressure		Storm Surge		Damage
Type	KNOTS	MPH	millibars	inches of mercury	Feet	Meters
Depression	less than 34	less than 39	------	------	------	------	------
Tropical Storm	35 - 63	39 - 73	------	------	------	------	------
Category 1	64 - 82	74 - 95	greater than 980	greater than 28.94	3 - 5	1.0 - 1.7	minimal
Category 2	83 - 95	96 - 110	979 - 965	28.50 - 28.91	6 - 8	1.8 - 2.6	moderate
Category 3	96 - 113	111 - 130	964 - 945	27.91 - 28.47	9 - 12	2.7 - 3.8	extensive
Category 4	114 - 135	131 - 155	944 - 920	27.17 - 27.88	13 - 18	3.9 - 5.6	extreme
Category 5	136+	156+	less than 920	less than 27.17	19+	5.7+	catastrophic

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Last Updated 8JAN11