An atmospheric river will bring heavy rainfall to lower elevations of California this week, and heavy snow to the Sierra Nevada mountains. Flash flooding, some of which may be locally considerable, will be a concern on the western foothills of the Sierra Nevada mountains through Tuesday. Landslides, rockfalls and mudslides are possible in the Southern California mountains. Read More >
Overview
Wind shear increased in an unstable environment ahead of a short wave trough. Thunderstorms developed over northeast New Mexico and moved southeast. As they moved southeast they formed into and MCS which produced occasional severe wind gusts as it moved southeast across the Texas Panhandle. One of these occasions was a downburst event over Dalhart that produced 100-110 mph winds which caused lots of damage, particularly at the Dalhart Airport.Wind & Hail:
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Wind
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Hail
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Flooding
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Hydrographs
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Storm Reports
Public Information Statement National Weather Service Amarillo TX 421 PM CDT Mon Aug 14 2017 ...NWS Damage Survey for 08/14/17 Dalhart Thunderstorm Wind Event... .Dalhart Downburst Wind Event... Peak Wind Estimated: 100-110 mph Fatalities: 0 Injuries: 0 Start Date: Aug 13 2017 Start Time: 6:20 PM CDT Start Location: 3 WSW Dalhart Start Lat/Lon: 36.05, -102.56 End Date: Aug 13 2017 End Time: 6:32 PM CDT End Location: 2 SW Dalhart End Lat/Lon: 36.03, -102.55 Summary: A significant downburst wind event occurred west and southwest of Dalhart, TX on Sunday evening. The downburst was associated with the rear flank downdraft of a supercell thunderstorm. Damage from the downburst was initially observed at the Twisted Elms Golf Course where several trees were uprooted and many large branches were downed, including some onto power lines. Damage at the golf course was estimated to be caused by winds around 75 to 85 mph. The damage continued to the southeast where several power poles were blown down. Severe straight line wind damage peaked at the airport where a 74 mph wind was observed by NWS ASOS equipment before the equipment was damaged by flying debris. The debris was from multiple airport hangars that were completely destroyed. Debris from the hangars was found up to a half mile away. Several small planes and a pop-up camper were flipped and thrown up to 50 yards. Damage at the airport was estimated to be from 100 to 110 mph winds, which is the equivalent of a high end EF-1 tornado. NOTE: The information in this statement is preliminary and subject to change pending final review of the event and publication in NWS storm data.
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