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Henderson County Skywarn

Overview

See this NWS Skywarn page.

Skywarn Severe Weather Spotter Training

New! Online Skywarn Spotter Training course - see the signup page and the QRZ article about it.

NWS no longer maintains a table of upcoming spotter training on the web, but asks you to contact them for upcoming classes. See NWS Contacts.

Event	Description
Tornado:	What...Tornado: Is it rotating ? If not, it's a rain shaft. Is it in contact with the ground ? If Not, it's a Funnel Cloud. Is there on going damaging? When....Now ? Past ? Beginning? Where... Location ?
Funnel Cloud:	What.....Funnel Cloud: Is it rotating? Is it in contact with the ground? If so, it's a Tornado. When....Now? Past? Just Beginning? Where... Location?
Wall Cloud:	When.....Now? Just Beginning? How long observed? Is it rotating? Where... Location?
Severe Winds:	What......Damage... What type and kind of severe wind damage ? Use the Beaufort Wind Speed Chart When.....Now ? Past ? Just Beginning ? Where.... Location ? General Examples of Severe Wind Damage: Power lines blown down Windows broken by wind Permanent signs blown down Radio tower/large antenna blown down Mobile home damaged Large roof area damaged Structure damage to buildings by winds More than one large tree blown over
Hail:	Do not use "Marble" size When.....Now - on going event ? Where.... Location ? What Size...How Large... Pea..............1/4 inch. Dime............3/4 inch. Nickel...........7/8 inch. Golf ball.......1 inch Quarter........ 1 inch. Baseball.......2 1/4 inch. Softball.........3 to 4 inch And if in Western and Northern Texas...cantaloupe...basketball
Flash Flooding:	What..... How Deep ? How Extensive? Are the animals walking two by two?? Is there a immediate threat to persons or property? When....On Going? Just Beginning? Where... Location?
Rain:	When............Now ? Just Beginning? Is it so heavy, you can't drive? Where........... Location? How Much.....At a rate of 2 inches per hour?

Estimating Hail Size(NWS)

Hail Diameter	Description
1/4"	Pea Size
1/2"	Marble Size (say "half-inch")
3/4" (Severe Criteria)	Dime Size
7/8"	Nickel Size
1"	Quarter Size
1 1/4"	Half Dollar Size
1 1/2"	Walnut or Ping Pong Ball Size
1 3/4"	Golf Ball Size
2"	Hen Egg Size
2 1/2"	Tennis Ball Size
2 3/4"	Baseball Size
3"	Teacup Size
4"	Grapefruit Size
4 1/2"	Softball Size

Estimating Wind Speeds

Wind Speed	Effects
25-31	Large branches in motion; whistling heard in telephone wires
32-38	Whole trees in motion; inconvenience felt walking against the wind
39-54	Twigs break off trees; wind generally impedes progress
55-72	Damage to chimneys and TV antennas; pushes over shallow rooted trees
73-112	Peels surfaces off roofs; windows broken; light mobile homes pushed or overturned; moving cars pushed off road
113-157	Roofs torn off houses; cars lifted off ground

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