Alert archive / Tennessee / Freeze Warnings in 2007

Freeze Warning 9, NWS Morristown, TN

November 6, 200721 counties in Tennessee

NWS Morristown, TN issued this freeze warning at Nov 6, 2007, 2:30 PM EST for 21 counties in Tennessee. It took effect at Nov 7, 2007, 2:00 AM EST. It was in force for 7 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
Nov 6, 2007, 2:30 PM EST (19:30 UTC)
In effect from
Nov 7, 2007, 2:00 AM EST
Expired
Nov 7, 2007, 9:00 AM EST
In force
7 hr
Issued by
NWS Morristown, TN
All 21 counties

Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Cocke County, TN, Grainger County, TN, Hamblen County, TN, Hamilton County, TN, Jefferson County, TN, Knox 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, Sevier County, TN, Union County, TN

The radar

The Knoxville radar (KMRX), 99 km from the middle of the area, began a volume at 19:27 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 12:00Z, 7.5 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2007-11-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Nashville Metro, TN at 12:00Z on 2007-11-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -102 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1823 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
-102 m²/s²
0-3 km storm-relative helicity
116 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 freeze 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 freeze warning went out at Nov 5, 3:45 PM EST, 22 hours 45 minutes earlier.

Area forecast discussion, Nov 5, 3:45 PM EST, 22 hours 45 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
345 PM EST MON NOV 5 2007

.SHORT TERM (TONIGHT THROUGH TUESDAY)...BREEZY AFTERNOON ACROSS THE
AREA TODAY THREATENING TO SPREAD ANY FIRES THAT START UP. GULF
MOISTURE NOW FLOWING INTO AREA WITH DEW POINT RISING FROM 30
DEGREES TO 47 DEGREES IN LAST FOUR HOURS AT KTYS. ALSO SAW AIRCRAFT
SOUNDINGS FROM KTRI SHOWING DEW POINT AT 1230 UTC WAS -14 DEG
C...VERSUS +1 DEG C AT 1845 UTC. NOT THAT WILD FIRE THREAT HAS GONE
AWAY...BUT FIRE BEHAVIOR WONT BE QUITE AS BAD NOW THAT MOISTURE IS
MOVING IN.

SHOULD BE WINDY ENOUGH TO WARRANT WIND ADVISORY IN E TN/W NC
MOUNTAINS...AND THINK THIS WILL BE FURTHER ALERT TO FIRE AND
FORESTRY AGENCIES FOR POSSIBLE FAST SPREADING FIRES AT HIGHER
ELEVATIONS.

WITH DEW POINTS RISING...INSTABILITY WILL BE GETTING BETTER FOR
STORMS...BUT THINK THAT TIMING WILL KEEP MOST OF ACTIVITY AS JUST
SHOWERS. FOR QPF...THINK 0.2 TO 0.3 INCH BASIN-AVERAGE AMOUNTS WILL
BE ABOUT IT SINCE MOVEMENT WILL BE PRETTY FAST.

WENT ON WARM SIDE OF GUIDANCE FOR LOWS AND HIGHS THESE TWO PERIODS.

.LONG TERM (TUESDAY NIGHT THROUGH MONDAY)...AFTER COLD FRONT EXITS
AREA TUESDAY, EXPECT SURFACE PRESSURE GRADIENT TO STAY A LITTLE
TIGHT UNTIL MIDNIGHT OR SO, PROVIDING SOME BREEZY CONDITIONS INTO
THE NIGHT. BUT WINDS WILL DIE DOWN THROUGH THE NIGHT. STILL, WITH
COLDER AIR AND A LITTLE WIND IT WILL BE THE RAWEST NIGHT OF THE
SEASON SO FAR. SURFACE HIGH BUILDS IN WEDNESDAY AND THURSDAY WITH
DRIER AND COOLER AIR, BUT THEN ANOTHER WAVE MOVES ACROSS THE NORTH
PORTIONS AND PROVIDES JUST ENOUGH LIFT TO BRING A SLIGHT CHANCE OF
SHOWERS. PREVIOUS PACKAGE HAD DRY WITH A LITTLE DOUBT, AND I HAVE
OPTED TO BRING LOW POPS INTO THE PICTURE LATE THURSDAY AND EARLY
FRIDAY. AFTER THIS ANOTHER DRY PERIOD. TEMPS MORE LIKE SEASONAL.
RAIN AMOUNTS NOT EXPECTED TO BE ANYTHING TO WRITE HOME ABOUT AND
WILL SAY THAT THE DROUGHT WILL CONTINUE TO GRADUALLY WORSEN FOR
ANOTHER WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
CHATTANOOGA AIRPORT, TN  46  56  30  55  33 /  50  10   0  10  10
KNOXVILLE MCGHEE TYSON AIRPORT, TN  43  50  28  52  32 /  60  10   0  10  10
OAK RIDGE, TN  43  55  29  52  32 /  70  10   0   0  10
TRI CITIES AIRPORT, TN  41  51  27  50  29 /  80  10  10  10  10

&&

.MRX WATCHES/WARNINGS/ADVISORIES...
NC...WIND ADVISORY UNTIL 4 AM EST TUESDAY FOR THE FOLLOWING ZONES:
     CHEROKEE...CLAY.

TN...WIND ADVISORY UNTIL 4 AM EST TUESDAY FOR THE FOLLOWING ZONES:
     BLOUNT SMOKY MOUNTAINS...COCKE SMOKY MOUNTAINS...EAST
     POLK...JOHNSON...SEVIER SMOKY MOUNTAINS...SOUTHEAST
     CARTER...SOUTHEAST GREENE...SOUTHEAST MONROE...UNICOI.

VA...NONE.
&&

GM/BB

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 5, 9:11 PM ESTFreeze WatchMRXAnderson, Bledsoe, Blount, Bradley, Cocke, Grainger and 15 more17 hr

Nearby

Freeze Warnings in Tennessee, 2007Every freeze warning in 2007

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.