Since the Spring Severe Weather Season is right around the corner, we thought
we'd take the time to briefly remind our spotters about when we, the National Weather
Service,
would like to hear from you, the spotters. First, a quick refresher on some
severe weather
basics... Severe Thunderstorms are thunderstorms
that produce...
- Winds of 58 mph (50 knots) or greater;
- Hail of 3/4 inch or greater (approximately
the size of a dime or larger); or a
- Tornado
Severe Thunderstorm (or Tornado) Watch...
- There is a threat for severe weather in and close to the watch area.
Spotters should be alert for the possibility of severe weather.
Severe Thunderstorm (or Tornado) Warning...
- A severe thunderstorm (or tornado) has been detected by radar, or has been
reported to the NWS.
We ask that our SKYWARN Spotters report the following to the NWS via e-mail, the
800 number provided to you during Spotter Training, or to your local SKYWARN Coordinator
(who
will in turn forward this to the NWS)... 1. HIGHEST PRIORITY/Life Threatening Criteria a. Any deaths or injuries associated with hazardous weather. b. Any TORNADO or
WATERSPOUT. 2. Other High Priority/Life Threatening Criteria a. Funnel or wall clouds. b. Clusters of "Virga" that expand as they
descend beneath the cloud base. c. Thunderstorms with wind gusts of at least 58 mph, or
that cause structural damage to homes, power lines, or whole trees. d. Hail 3/4 inch in
diameter (about the size of a penny) or greater. e. Flooding of rivers or streams into
homes or industries. Also stream, river, or poor drainage urban flooding which make roadways
totally impassable. i. Report following a short (less than 1 hour)
torrential downpour (0.7 inches in 15 mins., 1.2 inches in 20 mins). ii.
Report 2 inches of rain in 3 hours. iii. Report 1 inch of
rain in an hour in urban area. 3. Other Priority Items a. Thunderstorm wind gusts from 40 to 57 mph. These gusts are strong enough to down
tree limbs. b. Hail of any size less than 3/4 inch in diameter. c. Event total rainfall.
d. Rises of streams or rivers to bankfull condition. 4. During Tropical Storm or Hurricane Warnings...
a. Please report only Priority 1 and 2 Criteria Conditions. b. Report any wind
gusts greater than or equal to 58 mph whether or not a thunderstorm is in progress. c.
Also report the following: i. Any KNOWN storm surge inundations
of coastal areas. ii. The highest wind gust during the tropical
storm/hurricane. iii. The lowest barometric pressure and time
it occurred. iv. Event total rainfall. REMEMBER...NEVER place yourself in any danger
when reporting Severe Weather! Your safety is and should be your highest priority. Pass
along your reports ONLY when it is safe to do so. We need you and thank you always for
your help.
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