Severe Thunderstorm Warning Update for Logan Co, Colorado

This alert expired on August 7, 2020 at 9:00:00 AM MDT ·
This alert has been updated.
Alert area: Logan
Posted August 6, 2020 at 5:11:00 PM MDT
The storm which prompted the warning is no longer expected to
produce large hail or damaging winds. A spotter 15 miles northwest
of Sterling has reported dime-sized hail, 40 MPH wind gusts and over
an inch of rainfall from this storm. The warning will be allowed to
expire at 515 PM MDT. However, small hail, gusty winds and more
heavy rain are possible with this thunderstorm. Localized flooding
will also be possible.

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What is a Severe Thunderstorm Warning?


This is issued when either a severe thunderstorm is indicated by the WSR-88D radar or a spotter reports a thunderstorm producing hail one inch or larger in diameter and/or winds equal or exceed 58 miles an hour; therefore, people in the affected area should seek safe shelter immediately. Severe thunderstorms can produce tornadoes with little or no advance warning. Lightning frequency is not a criteria for issuing a severe thunderstorm warning. They are usually issued for a duration of one hour. They can be issued without a Severe Thunderstorm Watch being already in effect.

Like a Tornado Warning, the Severe Thunderstorm Warning is issued by your National Weather Service Forecast Office (NWFO). Severe Thunderstorm Warnings will include where the storm was located, what towns will be affected by the severe thunderstorm, and the primary threat associated with the severe thunderstorm warning. If the severe thunderstorm will affect the nearshore or coastal waters, it will be issued as the combined product--Severe Thunderstorm Warning and Special Marine Warning. If the severe thunderstorm is also causing torrential rains, this warning may also be combined with a Flash Flood Warning. If there is an ampersand (&) symbol at the bottom of the warning, it indicates that the warning was issued as a result of a severe weather report.

After it has been issued, the affected NWFO will follow it up periodically with Severe Weather Statements. These statements will contain updated information on the severe thunderstorm and they will also let the public know when the warning is no longer in effect.