Alert archive / Tennessee / Flash Flood Watches in 2018

Flash Flood Watch 1, NWS Morristown, TN

May 27, 20184 counties in Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this flash flood watch at May 27, 2018, 4:25 AM EDT for 4 counties in Tennessee; Cherokee County, Clay County, North Carolina. It took effect at May 27, 2018, 8:00 PM EDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: May 27, 2018, 4:25 AM EDT (08:25 UTC)
In effect from: May 27, 2018, 8:00 PM EDT
Expired: May 28, 2018, 8:00 PM EDT
In force: 24 hr
Issued by: NWS Morristown, TN
Flood severity: None

Counties Cherokee County, NC, Clay County, NC, Blount County, TN, Monroe County, TN, Polk County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 104 km from the middle of the area, began a volume at 08:28 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 00:00Z, 8.4 hours before the alert went out and 227 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: 1377 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 933 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 25 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 watch 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 watch went out at May 27, 4:16 AM EDT, 9 minutes earlier.

Area forecast discussion, May 27, 4:16 AM EDT, 9 minutes before

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Hazardous weather outlook, May 26, 3:46 PM EDT, 12 hours 39 minutes before

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In the hours before

Special weather statement, May 26, 10:58 PM EDT, 5 hours 27 minutes before

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Special weather statement, May 26, 11:01 PM EDT, 5 hours 24 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
May 26, 9:14 PM EDT	Special Weather Statement	MRX	Blount	46 min
May 26, 10:58 PM EDT	Special Weather Statement	MRX	Bradley, McMinn, Polk	47 min
May 26, 11:01 PM EDT	Special Weather Statement	MRX	Grainger	44 min
May 27, 3:14 PM EDT	Areal Flood Advisory	MRX	Carter, Johnson	2 hr
May 27, 4:45 PM EDT	Areal Flood Advisory	MRX	Sullivan	2 hr
May 27, 5:20 PM EDT	Flash Flood Warning	MRX	Johnson, Sullivan	54 min
May 27, 5:26 PM EDT	Areal Flood Advisory	MRX	Sevier	3 hr
May 27, 5:32 PM EDT	Areal Flood Advisory	MRX	Greene, Washington	118 min
May 27, 5:40 PM EDT	Special Weather Statement	MRX	Sevier	65 min
May 27, 5:59 PM EDT	Special Weather Statement	MRX	Loudon	46 min
May 27, 6:41 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, Roane	49 min
May 27, 7:10 PM EDT	Areal Flood Advisory	MRX	Anderson, Knox, Loudon, Roane, Union	2 hr
May 27, 7:27 PM EDT	Areal Flood Advisory	MRX	Blount, Knox	3 hr
May 27, 6:45 PM EDT	Special Weather Statement	MRX	Wise, City of Norton	45 min
May 27, 7:02 PM EDT	Areal Flood Advisory	MRX	Wise, City of Norton	118 min

Nearby

Flash Flood Watches in Tennessee, 2018 Flash Flood Watches in North Carolina, 2018 Every flash flood watch in 2018

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.