Alert archive / Virginia / Flash Flood Warnings in 2024

Flash Flood Warning 50, NWS Morristown, TN

September 27, 2024Washington County, City of Bristol, Virginia

NWS Morristown, TN issued this flash flood warning at Sep 27, 2024, 2:43 PM EDT for Washington County, City of Bristol, Virginia. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 27, 2024, 2:43 PM EDT (18:43 UTC)
Expired
Sep 27, 2024, 8:00 PM EDT
In force
5 hr
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Emergency
Flash flood emergency
Damage threat
Catastrophic
Flood severity
None

Counties City of Bristol, VA, Washington County, VA

The radar

The Knoxville radar (KMRX), 131 km from the middle of the area, began a volume at 18:44 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.7 hours before the alert went out and 205 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Greensboro/Hi Pt, NC at 12:00Z on 2024-09-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 117 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Greensboro/Hi Pt, NC at 12:00Z on 2024-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 311 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
117 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
591 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
311 m²/s²
0-3 km storm-relative helicity
433 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, 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 this flash flood warning went out at Sep 27, 1:22 PM EDT, 1 hour 21 minutes earlier.

Area forecast discussion, Sep 27, 1:22 PM EDT, 1 hour 21 minutes before
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Hazardous weather outlook, Sep 27, 3:43 AM EDT, 11 hours before
Hazardous Weather Outlook
National Weather Service Morristown TN
343 AM EDT Fri Sep 27 2024

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-280745-
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-
343 AM EDT Fri Sep 27 2024 /243 AM CDT Fri Sep 27 2024/

This Hazardous Weather Outlook is for portions of southwest North
Carolina...east Tennessee and southwest Virginia.

.DAY ONE...Today and Tonight

...Remnants of Hurricane Helene expected to impact the Tennessee
Valley and Southern Appalachians Today...

...A Tropical Storm Warning is in effect for Cherokee and Clay
Counties in North Carolina through early afternoon...

...High Wind Warning in effect for all of East Tennessee and
southwest Virginia through this Evening...

...A Flood Watch is in Effect for Flash Flooding Across Portions
of East Tennessee, southwest Virginia, and southwest North
Carolina...

The remnants of Hurricane Helene will bring tropical downpours
mainly this morning. Flash flooding will be possible with an
additional 2 to 4 inches expected in some places.

In addition to the rain, strong winds are forecast. The highest
winds are expected across the higher elevations of the east TN,
southwest VA, southwest NC mountains, and Cumberland Plateau.
However strong pressure gradients will exist across the region and
thus the lower elevations of the Tennessee valley will likely
experience some high winds Friday morning. With soils incredibly
saturated, trees are likely to fall during this period of high
winds.

.DAYS THREE THROUGH SEVEN...Saturday through Wednesday

No additional hazardous weather is expected at this time.
Flood waters will be receding and may still pose a threat before
streams retreat back within their banks.

.SPOTTER INFORMATION STATEMENT...

Reports of wind damage or flooding is very appreciated.

In the hours before

Local storm report, Sep 27, 12:28 PM EDT, 2 hours 15 minutes before
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Local storm report, Sep 27, 12:29 PM EDT, 2 hours 14 minutes before
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Local storm report, Sep 27, 12:47 PM EDT, 1 hour 56 minutes before
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Local storm report, Sep 27, 1:55 PM EDT, 48 minutes before
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Local storm report, Sep 27, 1:59 PM EDT, 44 minutes before
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Local storm report, Sep 27, 2:04 PM EDT, 39 minutes before
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The office that day

Everything else NWS Morristown, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 26, 11:52 PM EDTFlash Flood WarningMRXAnderson, Blount, Bradley, Knox, Loudon, McMinn and 3 more3 hr
Sep 27, 4:18 AM EDTAreal Flood AdvisoryMRXHamilton, Marion, Sequatchie5 hr
Sep 27, 4:47 AM EDTAreal Flood WarningMRXBlount, Cocke, Sevier6 hr
Sep 27, 7:44 AM EDTFlash Flood WarningMRXHamilton, Marion, Sequatchie4 hr
Sep 27, 8:50 AM EDTAreal Flood WarningMRXCarter, Greene, Johnson, Unicoi3 hr
Sep 27, 9:14 AM EDTFlash Flood Warning EmergencyConsiderable damage threatMRXCarter, Unicoi11 hr
Sep 27, 9:35 AM EDTFlash Flood Warning EmergencyCatastrophic damage threatMRXJohnson10 hr
Sep 27, 10:02 AM EDTFlash Flood Warning EmergencyCatastrophic damage threatMRXCarter, Unicoi, Washington7 hr
Sep 27, 10:36 AM EDTFlash Flood Warning Considerable damage threatMRXCocke, Sevier7 hr
Sep 27, 11:01 AM EDTRiver Flood WarningMRXHamilton22 hr
Sep 27, 11:26 AM EDTRiver Flood WarningMRXCarter15 hr
Sep 27, 12:02 PM EDTRiver Flood WarningMRXSevier21 hr
Sep 27, 2:29 PM EDTWind AdvisoryMRXBlount, Carter, Cocke, Greene, Johnson, Monroe and 3 more24 hr
Sep 27, 2:58 PM EDTFlash Flood WarningMRXHancock, Hawkins2 hr
Sep 27, 3:30 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatMRXCocke, Hamblen, Jefferson64 min
Sep 27, 4:54 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatMRXCarter, Greene, Johnson, Sullivan, Unicoi, Washington3 hr
Sep 27, 6:01 PM EDTAreal Flood WarningMRXCocke, Greene, Jefferson, Sevier16 hr
Sep 27, 6:25 PM EDTAreal Flood WarningMRXSullivan16 hr
Sep 27, 7:29 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatMRXJohnson6 hr
Sep 27, 7:38 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatMRXCarter, Johnson, Unicoi, Washington6 hr
Sep 27, 7:50 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatMRXCarter, Sullivan, Unicoi, Washington6 hr
Sep 27, 11:13 AM EDTFlash Flood WarningMRXRussell, Scott, Washington, Wise, City of Bristol, City of Norton4 hr

Nearby

Flash Flood Warnings in Virginia, 2024Every flash flood warning in 2024

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.