Hot and humid air mass produced diurnal convection that resulted in localized flash flooding at the University of Tennessee.
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The episode as NWS MRX wrote it up.
Hot and humid air mass produced diurnal convection that resulted in localized flash flooding at the University of Tennessee.
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 Morristown, TN wrote its last area forecast discussion before the first event at Jul 24, 2:00 PM EST, 1 hour 15 minutes earlier.
Area Forecast Discussion National Weather Service Morristown TN 300 PM EDT Wed Jul 24 2024 ...New SHORT TERM, LONG TERM... .SHORT TERM... (This evening through Thursday) Issued at 254 PM EDT Wed Jul 24 2024 Key Messages: 1. Periods of showers and a few thunderstorms remain possible while temperatures remain seasonally cool through the short term. Discussion: Upper troughing with a southwest to northeast oriented H3 jet of 85- 100kts remains placed over the Ohio Valley region. Lobes of vorticity and upper level divergence associated with the right entrance region of this jet are working with weak surface convergence to develop numerous to widespread showers across portions of Tennessee into northern sections of our bordering Gulf States. CAM guidance generally depicts a lull in activity late this evening to just after midnight followed by an additional uptick in activity with a secondary shortwave/vort lobes during the overnight hours into Thursday morning. Thursday morning into Thursday afternoon trends suggest that the greatest precip chance will generally be south and east of the I-40 & I-81 corridors. SPC Mesoanalysis and RAP soundings depict MLCAPE will remain around 700J/kg or less through this period, which will act to limit precip efficiency and overall threats with this activity. However, given recent rains saturating soil and potential training of storms that may produce upwards of 1" hour rain rates, very isolated flooding cannot be totally ruled out. Believe the low probability wording in the HWO is good and will continue to roll with that. Temperatures will remain slightly below seasonal normals through the period. && .LONG TERM... (Thursday night through next Wednesday) Issued at 254 PM EDT Wed Jul 24 2024 Key Messages: 1. Chances for showers and storms during the entire period, but less coverage is expected across the north Friday into Saturday. 2. High temperatures should be near to a bit below normal. Discussion: Models continue to show an overall moist pattern for the long term period. We start the period Thursday night with an upper trough over the Great Lakes region and upper ridging to our southeast and also to our west. The upper ridge will build east during the weekend then flatten out and retrograde to our southwest as another upper trough digs into the eastern US late in the period. No big airmass change is expected through all of this, but some limited drying is currently expected to work in early in the period especially north which may bring less convective coverage Friday into Saturday across at least the north. Overall we will see chances for showers and thunderstorms throughout the extended period. Right now the highest chances look to be Sunday and especially Monday/Tuesday as the upper ridge is replaced by troughing. High temperatures are generally expected to run near to slightly below normal. && .AVIATION... (18Z TAFS) Issued at 140 PM EDT Wed Jul 24 2024 Unsettled weather with periods of showers and potential isolated storm possible for the 18Z TAF cycle. Confidence is honestly low, especially in regards to cig height and fog, but periods of MVFR to IFR reductions in flight categories are possible. Notably early Thursday morning when CAM guidance suggest a secondary period of activity will move through. && .PRELIMINARY POINT TEMPS/POPS... Chattanooga Airport, TN 71 83 71 85 / 50 60 20 50 Knoxville McGhee Tyson Airport, TN 70 83 70 84 / 60 60 20 50 Oak Ridge, TN 69 83 69 84 / 50 60 20 50 Tri Cities Airport, TN 68 81 68 84 / 60 60 20 30 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && SHORT TERM...KRS AVIATION...KRS
Hazardous Weather Outlook National Weather Service Morristown TN 257 PM EDT Wed Jul 24 2024 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-251900- Cherokee-Clay-Scott TN-Campbell-Claiborne-Hancock-Hawkins- Sullivan-Johnson-Morgan-Anderson-Union-Grainger-Hamblen- Northwest Cocke-Cocke Smoky Mountains-Northwest Greene- Southeast Greene-Washington TN-Unicoi-Northwest Carter- Southeast Carter-Roane-Loudon-Knox-Jefferson-Northwest Blount- Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains- Sequatchie-Bledsoe-Rhea-Meigs-McMinn-Northwest Monroe- Southeast Monroe-Marion-Hamilton-Bradley-West Polk-East Polk-Lee- Wise-Scott VA-Russell-Washington VA- 257 PM EDT Wed Jul 24 2024 /157 PM CDT Wed Jul 24 2024/ This Hazardous Weather Outlook is for portions of southwest North Carolina...east Tennessee and southwest Virginia. .DAY ONE...This Afternoon and Tonight The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not needed at this time.
The Knoxville radar (KMRX), 54 km away, was scanning. The volume nearest the first event began at 20:13 UTC.
1 flash flood. Local standard time, as filed.
Lake Avenue and 19th Street flooded to a depth of three inches near UTK campus.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2024Every state in 2024This day in weather historyWarnings in Tennessee, July 2024
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: 1205503.