Alert archive / Tennessee / Tornado Watches in 2010
Tornado Watch 6
The Storm Prediction Center issued this tornado watch at Jan 21, 2010, 12:01 PM CST for 6 states. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 21, 2010, 12:01 PM CST (18:01 UTC)
- Expired
- Jan 21, 2010, 3:26 PM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 55 counties
Colbert County, AL, Franklin County, AL, Lauderdale County, AL, Clay County, AR, Craighead County, AR, Greene County, AR, Mississippi County, AR, Calloway County, KY, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Butler County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Stoddard County, MO, Alcorn County, MS, Benton County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Madison County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Stewart County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 86 km from the middle of the area, began a volume at 18:04 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.
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
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 21, 12:23 PM CST | Severe Thunderstorm Warning | PAH | Fulton | 22 min |
| Jan 21, 2:59 PM CST | Flash Flood Warning | MEG | Decatur, Henderson | 95 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 12:00Z, 6.0 hours before the alert went out and 230 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.
- Mixed-layer CAPE
- 24 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 540 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 20, 8:59 PM CST | Mesoscale Discussion | SPC | Choctaw, Mobile, Washington | 91 min |
| Jan 20, 10:18 PM CST | Mesoscale Discussion | SPC | Coffee, Covington, Escambia, Geneva, Houston | 87 min |
| Jan 21, 1:31 AM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Barbour, Butler, Choctaw, Clarke and 22 more | 29 min |
| Jan 21, 2:09 AM CST | Tornado Watch | SPC | Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 25 more | 7 hr |
| Jan 21, 5:44 AM CST | Mesoscale Discussion | SPC | Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 25 more | 61 min |
| Jan 21, 7:57 AM CST | Mesoscale Discussion | SPC | Geneva, Houston | 33 min |
| Jan 21, 9:55 AM CST | Mesoscale Discussion | SPC | Colbert, Lauderdale | 65 min |
| Jan 21, 5:14 PM CST | Mesoscale Discussion | SPC | Jackson, Madison | 91 min |
| Jan 20, 6:17 PM CST | Mesoscale Discussion | SPC | Crawford, Franklin, Garland, Johnson, Logan, Montgomery and 7 more | 88 min |
| Jan 20, 6:42 PM CST | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Columbia, Hempstead and 8 more | 93 min |
| Jan 20, 9:20 PM CST | Mesoscale Discussion | SPC | Clark, Cleveland, Crawford, Dallas, Franklin, Garland and 19 more | 55 min |
| Jan 20, 9:36 PM CST | Tornado Watch | SPC | Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 15 more | 7 hr |
| Jan 20, 11:03 PM CST | Mesoscale Discussion | SPC | Crawford, Franklin, Garland, Hempstead, Howard, Johnson and 9 more | 87 min |
| Jan 20, 11:39 PM CST | Mesoscale Discussion | SPC | Ashley, Chicot | 66 min |
| Jan 21, 1:13 AM CST | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Clark, Cleveland and 12 more | 62 min |
| Jan 21, 3:34 AM CST | Mesoscale Discussion | SPC | Ashley, Chicot, Desha, Drew | 56 min |
| Jan 21, 3:16 PM CST | Severe Thunderstorm Watch | SPC | Adair, Allen, Barren, Butler, Casey, Christian and 17 more | 6 hr |
Nearby
Tornado Watches in Tennessee, 2010Tornado Watches in Missouri, 2010Tornado Watches in Mississippi, 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.