Alert archive / Tennessee / Frost Advisories in 2015

Frost Advisory 1, NWS Morristown, TN

April 4, 201512 counties in Tennessee; Cherokee County, Clay County, North Carolina

NWS Morristown, TN issued this frost advisory at Apr 4, 2015, 2:04 AM CDT for 12 counties in Tennessee; Cherokee County, Clay County, North Carolina. It took effect at Apr 5, 2015, 1:00 AM CDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Apr 4, 2015, 2:04 AM CDT (07:04 UTC)
In effect from: Apr 5, 2015, 1:00 AM CDT
Expired: Apr 5, 2015, 8:00 AM CDT
In force: 7 hr
Issued by: NWS Morristown, TN

Counties Cherokee County, NC, Clay County, NC, Bledsoe County, TN, Bradley County, TN, Hamilton County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 134 km from the middle of the area, began a volume at 07:05 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

Nashville Metro, TN (KBNA), launched 00:00Z, 7.1 hours before the alert went out and 189 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: 2 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 593 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 107 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 frost advisory 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 frost advisory went out at Apr 4, 12:28 AM CDT, 1 hour 36 minutes earlier.

Area forecast discussion, Apr 4, 12:28 AM CDT, 1 hour 36 minutes before

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Hazardous weather outlook, Apr 3, 2:44 PM CDT, 11 hours 20 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE MORRISTOWN TN
344 PM EDT FRI APR 3 2015

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-041945-
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-NW 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-RUSSELL-WASHINGTON-
344 PM EDT FRI APR 3 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH
CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

...WINDY CONDITIONS TODAY AND TONIGHT...
...RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON AND EVENING...

A DEVELOPING AREA OF LOW PRESSURE WILL MOVE ACROSS THE OHIO VALLEY
TODAY AND INTO THE MID-ATLANTIC STATES TONIGHT. THE TIGHTENING
PRESSURE GRADIENTS AROUND THIS SYSTEM WILL PRODUCE WINDY CONDITIONS
AREA-WIDE FOR THIS AFTERNOON THROUGH EARLY SATURDAY MORNING.

A SQUALL LINE OF THUNDERSTORMS WILL DEVELOP ACROSS ALABAMA...MIDDLE
TENNESSEE AND EASTERN KENTUCKY THIS AFTERNOON. THIS LINE OF STORMS
WILL MOVE EAST INTO THE PLATEAU AND SOUTHWESTERN VIRGINIA BY LATE
AFTERNOON OR EARLY EVENING...THEN ACROSS THE REST OF THE AREA BY
AROUND MIDNIGHT. THE MAIN CONCERN FOR THIS LINE OF STORMS WILL BE
DAMAGING WINDS...SMALL HAIL...AND LOCALLY HEAVY DOWNPOURS.
HOWEVER...ISOLATED TORNADOES ARE ALSO POSSIBLE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATE THIS AFTERNOON AND
EVENING.

In the hours before

Local storm report, Apr 3, 9:18 PM CDT, 4 hours 46 minutes before

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Local storm report, Apr 3, 9:27 PM CDT, 4 hours 37 minutes before

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Local storm report, Apr 3, 9:33 PM CDT, 4 hours 31 minutes before

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Local storm report, Apr 3, 9:44 PM CDT, 4 hours 20 minutes before

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Local storm report, Apr 3, 9:51 PM CDT, 4 hours 13 minutes before

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Local storm report, Apr 3, 9:52 PM CDT, 4 hours 12 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
Apr 3, 7:09 PM CDT	Special Weather Statement	MRX	Anderson, Campbell, Morgan, Scott	51 min
Apr 3, 7:12 PM CDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Meigs, Rhea, Roane	48 min
Apr 3, 7:27 PM CDT	Severe Thunderstorm Warning	MRX	Marion, Sequatchie	48 min
Apr 3, 7:46 PM CDT	Severe Thunderstorm Warning	MRX	Blount, Loudon, McMinn, Monroe	44 min
Apr 3, 7:58 PM CDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Monroe, Polk	62 min
Apr 3, 8:13 PM CDT	Severe Thunderstorm Warning	MRX	Marion, Sequatchie	47 min
Apr 4, 2:04 AM CDT	Freeze Warning	MRX	Anderson, Blount, Campbell, Carter, Claiborne, Cocke and 15 more	30 hr
Apr 3, 8:41 PM CDT	Severe Thunderstorm Warning	MRX	Cherokee, Clay	64 min

Nearby

Frost Advisories in Tennessee, 2015 Frost Advisories in North Carolina, 2015 Every frost advisory in 2015

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.