Isolated to scattered thunderstorms developed late this afternoon and evening along a moisture gradient and remnant outflow boundary from earlier day storms. One of these storms became strong enough to produce high enough winds to break a couple of large tree limbs off of a tree.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS JKL wrote it up.
Isolated to scattered thunderstorms developed late this afternoon and evening along a moisture gradient and remnant outflow boundary from earlier day storms. One of these storms became strong enough to produce high enough winds to break a couple of large tree limbs off of a tree. These landed on a nearby storage building, causing it to collapse.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Jackson, KY wrote its last area forecast discussion before the first event at Jul 23, 6:06 PM EST, 24 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED National Weather Service Jackson KY 706 PM EDT Sun Jul 23 2017 .UPDATE... Issued at 706 PM EDT SUN JUL 23 2017 Freshened up the POPs through tonight based on the latest radar and higher resolution model guidance trends. The best instability gradient has been shifting slightly towards the Tennessee/Kentucky border with time, with more sustained convection aligning from north central Tennessee to southwest Tennessee. Scattered convection has initiated across portions of the Cumberland Valley in the last 15 minutes or so, and will continue to advertise the highest POPs down in this area. Did tighten up the gradient of POPs more so to the north, where the last few runs of the HRRR has been suggesting more limited activity through this evening. Updates will be out shortly. && .SHORT TERM...(This evening through Monday night) Issued at 401 PM EDT SUN JUL 23 2017 MCV crossing east Kentucky into West Virginia has really zapped our instability today. We really don't see much CU out there. There is a dewpoint/ouflow boundary draped across our far south, near Middlesboro, where instability is much higher to the south of this boundary. This would likely be the best area to see development this evening as dewpoints have remained in the mid to upper 60s back to the north. Temperatures have also remained a bit cooler today to the north. All of this together has really weakened the threat of storms for much of the area. With this in mind, have opted to drop the flash flood watch for the northern counties. Best rain chances will remain in the south closer to that boundary this evening. Should see activity diminish quickly by mid to late evening with dry weather expected overnight. With more clearing expected tonight, we could see a good deal of valley fog tonight. The cold front to the north will drop south tomorrow afternoon/evening and may allow a few showers or storms to pop up along the boundary at that time. Instability is rather weak, but given the middle of the afternoon, can't rule out an isolated storm. As the cold front sinks to the south tomorrow evening, dry weather will be seen through Monday night. We may see another round of valley fog Monday night pending cloud cover. .LONG TERM...(Tuesday through Sunday) Issued at 440 PM EDT SUN JUL 23 2017 At the start of the period, a shortwave trough is expected to be moving through the Northeast and Mid Atlantic states with an upper level ridge centered over the Southern Plains region. Height rises At the surface, a boundary should continue pushing south of the area with high pressure expected to be centered across the Great Lakes region and Ontario and building into the region. A period of height rises should continue into the start of the period as well. Mid to upper level as well as surface high pressure centered north or northeast of the area is expected to dominate through midweek. The GFS is drier Tuesday into Wednesday compared to the recent ECWMF runs though the 12Z ECMWF has trended drier. With high pressure dominating, generally dry weather is expected for Tuesday into Wednesday though the cap may be weaker near the VA border and a slight chances right along the VA was used each afternoon. Temperatures will be near to slightly above normal on both days with with highs in the 80s on Tuesday and upper 80s to near 90 on Wednesday. Lows will be a bit lower than recent nights on Tuesday night in the mid 60s. The high, however, should move east of the area by late Wed into Wed night, with the boundary that will have stalled south of the area lifting north as a warm front by late Wed and Wed night and leading to increase in dewpoints and humidity. Models continue to indicate a low pressure system moving across central to eastern Canada during the middle to end of the week. An associated cold front should drop south of the Great Lakes and to the OH River on Thursday night. Models continue to indicate the boundary should move south across the area on Friday in advance of a shortwave trough. This boundary should continue to push south of the area Friday night into Saturday. Once the axis of the shortwave trough moves through on Saturday, height rises should occur by the second half of next weekend, with high pressure building toward the area. With the approaching front and shortwave trough more organized convection is expected from Thursday afternoon through Friday evening. Until the shortwave trough axis moves south and east, isolated convection cannot be ruled out over the weekend. Model runs vary with timing this and this will ultimately determine if next weekend ends on a dry note. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) ISSUED AT 141 PM EDT SUN JUL 23 2017 Dying MCS has really zapped the daytime warming thus far and thus will keep thunderstorm chances at bay until after 20 or 21z. It looks like there will be a narrow window this evening for a few storms. Otherwise, mainly VFR conditions should dominate the TAF period. If we can clear out late tonight, we could have to contend with some valley fog, although no impacts are expected at the TAF sites. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && UPDATE...GEOGERIAN SHORT TERM...KAS LONG TERM...JP AVIATION...KAS
Hazardous Weather Outlook National Weather Service Jackson KY 355 PM EDT Sun Jul 23 2017 KYZ044-050>052-058>060-068-069-079-080-083>088-104-106>120-242300- Fleming-Montgomery-Bath-Rowan-Estill-Powell-Menifee-Rockcastle- Jackson-Pulaski-Laurel-Wayne-McCreary-Whitley-Knox-Bell-Harlan- Elliott-Morgan-Johnson-Wolfe-Magoffin-Floyd-Lee-Breathitt-Knott- Owsley-Perry-Clay-Leslie-Letcher-Martin-Pike- Including the cities of Flemingsburg, Camargo, Jeffersonville, Mount Sterling, Owingsville, Morehead, Irvine, Ravenna, Clay City, Stanton, Frenchburg, Brodhead, Mount Vernon, McKee, Annville, Burnside, Somerset, London, Monticello, Stearns, Whitley City, Corbin, Williamsburg, Barbourville, Middlesboro, Pineville, Cumberland, Harlan, Sandy Hook, West Liberty, Paintsville, Campton, Salyersville, Prestonsburg, Wheelwright, Beattyville, Jackson, Hindman, Pippa Passes, Booneville, Hazard, Manchester, Hyden, Jenkins, Whitesburg, Inez, Coal Run, Elkhorn City, Pikeville, and South Williamson 355 PM EDT Sun Jul 23 2017 This hazardous weather outlook is for portions of eastern Kentucky. .DAY ONE...Tonight. Thunderstorms are possible this evening. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Thunderstorms will be possible through Saturday, mainly during the afternoon and evening hours. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated. KAS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON KY
651 PM EDT SUN JUL 23 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0430 AM FLASH FLOOD 1 ENE GATES 38.24N 83.34W
07/23/2017 ROWAN KY 911 CALL CENTER
REPORT OF MAN STRANDED ON HOOD OF CAR AND HOME FLOODED
NEAR HALDEMAN ROAD AND BUFFALO BRANCH ROAD.
&&
DMJSpecial Weather Statement National Weather Service JACKSON KY 729 PM EDT SUN JUL 23 2017 KYZ084>086-240000- Whitley-McCreary-Knox- 729 PM EDT SUN JUL 23 2017 ...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN KNOX...SOUTHEASTERN MCCREARY AND WHITLEY COUNTIES... At 727 PM EDT, a strong thunderstorm was located over Duckrun, or 7 miles west of Williamsburg, moving east at 25 mph. Winds in excess of 40 mph are possible with this storm. Locations impacted include... Williamsburg, Whitley City, Julip, Gatliff, Emlyn, Clate, Clio, Verne, Goldbug, Gausdale, Pleasant View, Louden, Krupp, Hollyhill, Polly Camp, Wofford, Indian Creek, Nevisdale, Wiborg and Bon. Torrential rainfall is also occurring with this storm, and may cause significant ponding of water on roadways. Do not drive your vehicle through flooded roadways. LAT...LON 3667 8446 3682 8452 3688 8396 3661 8396 TIME...MOT...LOC 2327Z 270DEG 22KT 3675 8431 DJ
The Knoxville radar (KMRX), 147 km away, was scanning. The volume nearest the first event began at 23:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
A citizen reported a couple of large tree limbs being snapped, and subsequently falling onto a nearby storage building, causing it to collapse.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kentucky in 2017Every state in 2017This day in weather historyWarnings in Kentucky, July 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 702356.