Alert archive / Tennessee / Flash Flood Warnings in 2023

Flash Flood Warning 10, NWS Morristown, TN

July 5, 2023Hamilton County, Tennessee

NWS Morristown, TN issued this flash flood warning at Jul 5, 2023, 8:02 AM EDT for Hamilton County, Tennessee. It was in force for 108 min. 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 5, 2023, 8:02 AM EDT (12:02 UTC)
Expired: Jul 5, 2023, 9:50 AM EDT
In force: 108 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

County Hamilton County, TN

The radar

The Northeast Alabama radar (KHTX), 88 km from the middle of the area, began a volume at 12:04 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 0.0 hours before the alert went out and 210 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: 802 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 760 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 5, 7:37 AM EDT, 25 minutes earlier.

Area forecast discussion, Jul 5, 7:37 AM EDT, 25 minutes before

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Hazardous weather outlook, Jul 5, 3:14 AM EDT, 4 hours 48 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 4, 8:30 PM EDT	Areal Flood Advisory	MRX	Scott	3 hr
Jul 5, 6:39 AM EDT	Areal Flood Advisory	MRX	Bledsoe, Rhea, Roane	3 hr
Jul 5, 7:10 AM EDT	Areal Flood Advisory	MRX	Bradley	98 min
Jul 5, 8:29 AM EDT	Areal Flood Advisory	MRX	Hamilton	2 hr
Jul 5, 8:42 AM EDT	Areal Flood Advisory	MRX	Blount, Loudon	2 hr
Jul 5, 8:48 AM EDT	Flash Flood Warning	MRX	Bradley	117 min
Jul 5, 12:16 PM EDT	Areal Flood Advisory	MRX	Scott	85 min

Nearby

Flash Flood Warnings in Tennessee, 2023 Every flash flood warning in 2023

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.