Alert archive / Tennessee / Tornado Watches in 2010

Tornado Watch 130

May 1, 201025 counties in Tennessee

The Storm Prediction Center issued this tornado watch at May 1, 2010, 10:22 PM CDT for 25 counties in Tennessee. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2010, 10:22 PM CDT (03:22 UTC)
Expired
May 2, 2010, 3:37 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 25 counties

Bedford County, TN, Benton County, TN, Cannon County, TN, Cheatham County, TN, Coffee County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lewis County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, Montgomery County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 47 km from the middle of the area, began a volume at 03:23 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 1, 10:23 PM CDTTornado WarningOHXHickman, Lewis, Maury, Williamson37 min
May 1, 10:24 PM CDTSevere Thunderstorm WarningOHXMontgomery6 min
May 1, 10:27 PM CDTSevere Thunderstorm WarningOHXStewart18 min
May 2, 3:05 AM CDTTornado WarningOHXBenton, Houston, Humphreys, Stewart55 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 3.4 hours before the alert went out and 41 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 00:00Z on 2010-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2010-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
1 J/kg
Mixed-layer CIN
-200 J/kg
Mixed-layer LCL
562 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
62 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 1, 7:07 PM CDTMesoscale DiscussionSPCBledsoe, Blount, Bradley, Cannon, Coffee, Franklin and 15 more53 min
May 1, 7:30 PM CDTMesoscale DiscussionSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more30 min
May 1, 8:06 PM CDTTornado Watch PDSSPCCarroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more8 hr
May 1, 9:19 PM CDTMesoscale DiscussionSPCGiles, Hickman, Lawrence, Lewis, Maury, Wayne56 min
May 1, 11:38 PM CDTMesoscale DiscussionSPCBenton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more67 min
May 2, 2:33 AM CDTMesoscale DiscussionSPCBedford, Benton, Cannon, Carroll, Cheatham, Chester and 45 more87 min
May 2, 3:36 AM CDTTornado Watch PDSSPCBedford, Benton, Cannon, Carroll, Cheatham, Chester and 46 more8 hr
May 2, 6:37 AM CDTMesoscale DiscussionSPCBedford, Benton, Cannon, Carroll, Cheatham, Chester and 48 more113 min
May 2, 11:15 AM CDTMesoscale DiscussionSPCCheatham, Clay, Davidson, Dickson, Hardin, Hickman and 13 more60 min
May 2, 11:57 AM CDTSevere Thunderstorm WatchSPCBedford, Cannon, Clay, Coffee, Cumberland, Davidson and 24 more7 hr
May 2, 2:28 PM CDTMesoscale DiscussionSPCBedford, Cannon, Coffee, Cumberland, DeKalb, Fentress and 17 more62 min
May 2, 2:32 PM CDTSevere Thunderstorm WatchSPCAnderson, Campbell, Claiborne, Hancock, Morgan, Scott and 1 more5 hr
May 2, 6:12 PM CDTMesoscale DiscussionSPCAnderson, Campbell, Claiborne, Grainger, Hamblen, Hancock and 5 more93 min
May 2, 6:29 PM CDTMesoscale DiscussionSPCBedford, Cannon, Coffee, DeKalb, Giles, Lincoln and 3 more61 min

Nearby

Tornado Watches in Tennessee, 2010Every tornado watch in 2010

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.