Alert archive / Tennessee / Flash Flood Warnings in 2019

Flash Flood Warning 20, NWS Morristown, TN

July 30, 2019Johnson County, Sullivan County, Tennessee; Washington County, Virginia

NWS Morristown, TN issued this flash flood warning at Jul 30, 2019, 6:08 PM EDT for Johnson County, Sullivan County, Tennessee; Washington County, Virginia. It was in force for 3 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: Jul 30, 2019, 6:08 PM EDT (22:08 UTC)
Expired: Jul 30, 2019, 9:15 PM EDT
In force: 3 hr
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

Counties Johnson County, TN, Sullivan County, TN, Washington County, VA

The radar

The Knoxville radar (KMRX), 130 km from the middle of the area, began a volume at 22:09 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, 10.1 hours before the alert went out and 199 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 49 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 1575 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: -77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 30, 3:38 PM EDT, 2 hours 30 minutes earlier.

Area forecast discussion, Jul 30, 3:38 PM EDT, 2 hours 30 minutes before

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Hazardous weather outlook, Jul 30, 3:44 PM EDT, 2 hours 24 minutes before

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In the hours before

Special weather statement, Jul 30, 5:01 PM EDT, 1 hour 7 minutes before

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Special weather statement, Jul 30, 5:06 PM EDT, 1 hour 2 minutes before

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Special weather statement, Jul 30, 5:16 PM EDT, 52 minutes before

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Special weather statement, Jul 30, 5:45 PM EDT, 23 minutes before

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Special weather statement, Jul 30, 5:46 PM EDT, 22 minutes before

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Special weather statement, Jul 30, 5:50 PM EDT, 18 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 1:50 PM EDT	Special Weather Statement	MRX	Hamilton	40 min
Jul 30, 1:56 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton	49 min
Jul 30, 2:30 PM EDT	Areal Flood Advisory	MRX	Hamilton	2 hr
Jul 30, 2:56 PM EDT	Special Weather Statement	MRX	Scott	49 min
Jul 30, 3:06 PM EDT	Severe Thunderstorm Warning	MRX	Scott	39 min
Jul 30, 3:28 PM EDT	Areal Flood Advisory	MRX	Scott	2 hr
Jul 30, 3:55 PM EDT	Special Weather Statement	MRX	Campbell	35 min
Jul 30, 4:10 PM EDT	Special Weather Statement	MRX	Monroe	50 min
Jul 30, 4:16 PM EDT	Special Weather Statement	MRX	Rhea	29 min
Jul 30, 4:34 PM EDT	Special Weather Statement	MRX	Campbell	41 min
Jul 30, 4:35 PM EDT	Areal Flood Advisory	MRX	Johnson	115 min
Jul 30, 4:41 PM EDT	Special Weather Statement	MRX	Marion	49 min
Jul 30, 5:01 PM EDT	Special Weather Statement	MRX	Blount	44 min
Jul 30, 5:06 PM EDT	Special Weather Statement	MRX	Loudon, Roane	39 min
Jul 30, 5:16 PM EDT	Special Weather Statement	MRX	Morgan	29 min
Jul 30, 5:45 PM EDT	Special Weather Statement	MRX	Scott	45 min
Jul 30, 5:46 PM EDT	Special Weather Statement	MRX	Scott	29 min
Jul 30, 5:47 PM EDT	Areal Flood Advisory	MRX	Sullivan	118 min
Jul 30, 5:50 PM EDT	Special Weather Statement	MRX	Roane	40 min
Jul 30, 7:00 PM EDT	Areal Flood Advisory	MRX	Sullivan	2 hr
Jul 30, 2:42 PM EDT	Areal Flood Advisory	MRX	Wise	2 hr
Jul 30, 6:09 PM EDT	Special Weather Statement	MRX	City of Bristol	36 min
Jul 30, 6:36 PM EDT	Special Weather Statement	MRX	Washington	39 min
Jul 30, 7:17 PM EDT	Special Weather Statement	MRX	Lee	28 min
Jul 30, 2:40 PM EDT	Special Weather Statement	MRX	Clay	50 min
Jul 30, 2:58 PM EDT	Severe Thunderstorm Warning	MRX	Cherokee, Clay	47 min

Nearby

Flash Flood Warnings in Tennessee, 2019 Flash Flood Warnings in Virginia, 2019 Every flash flood warning in 2019

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.