Alert archive / Tennessee / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 166

April 21, 19974 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 21, 1997, 1:30 PM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Apr 21, 1997, 1:30 PM CDT (18:30 UTC)
Expired: Apr 21, 1997, 8:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center

All 66 counties

Colbert County, AL, Franklin County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Crittenden County, AR, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Sunflower County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Bedford County, TN, Cannon County, TN, Chester County, TN, Coffee County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Fayette County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Hickman County, TN, Humphreys County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Moore County, TN, Perry County, TN, Rutherford County, TN, Shelby County, TN, Smith County, TN, Tipton County, TN, Trousdale County, TN, Warren County, TN, Wayne County, TN, Williamson County, TN, Wilson County, TN

The radar

The Memphis radar (KNQA), 111 km from the middle of the area, began a volume at 18:30 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 21, 1:54 PM CDT	Tornado Warning	OHX	Bedford, Coffee	36 min
Apr 21, 2:16 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	29 min
Apr 21, 2:32 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Warren	43 min
Apr 21, 2:43 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	32 min
Apr 21, 2:47 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Lewis, Wayne	43 min
Apr 21, 2:49 PM CDT	Severe Thunderstorm Warning	BMX	Lauderdale	56 min
Apr 21, 2:57 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	33 min
Apr 21, 3:16 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Warren	44 min
Apr 21, 3:16 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	44 min
Apr 21, 3:28 PM CDT	Flash Flood Warning	OHX	Lewis, Marshall, Maury	2 hr
Apr 21, 3:28 PM CDT	Flash Flood Warning	OHX	Bedford, Coffee	2 hr
Apr 21, 3:28 PM CDT	Flash Flood Warning	OHX	Warren, White	2 hr
Apr 21, 3:33 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	27 min
Apr 21, 3:41 PM CDT	Severe Thunderstorm Warning	BMX	Limestone	64 min
Apr 21, 3:47 PM CDT	Severe Thunderstorm Warning	OHX	Lewis, Wayne	43 min
Apr 21, 4:03 PM CDT	Severe Thunderstorm Warning	BMX	Colbert, Lawrence	57 min
Apr 21, 4:11 PM CDT	Severe Thunderstorm Warning	MEG	Alcorn, Prentiss	49 min
Apr 21, 4:16 PM CDT	Severe Thunderstorm Warning	OHX	Coffee	29 min
Apr 21, 4:24 PM CDT	Severe Thunderstorm Warning	MEG	Lafayette	46 min
Apr 21, 4:36 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Wayne	39 min
Apr 21, 4:49 PM CDT	Severe Thunderstorm Warning	MEG	Pontotoc	46 min
Apr 21, 5:07 PM CDT	Severe Thunderstorm Warning	MEG	Lafayette	33 min
Apr 21, 5:14 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence	46 min
Apr 21, 5:31 PM CDT	Severe Thunderstorm Warning	MEG	Itawamba, Prentiss	49 min
Apr 21, 5:36 PM CDT	Severe Thunderstorm Warning	MEG	Pontotoc	49 min
Apr 21, 5:48 PM CDT	Severe Thunderstorm Warning	OHX	Lincoln	42 min
Apr 21, 5:50 PM CDT	Severe Thunderstorm Warning	MEG	Tishomingo	30 min
Apr 21, 5:59 PM CDT	Severe Thunderstorm Warning	OHX	Giles	31 min
Apr 21, 6:08 PM CDT	Severe Thunderstorm Warning	BMX	Lauderdale, Limestone	67 min
Apr 21, 6:18 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence	12 min
Apr 21, 6:33 PM CDT	Severe Thunderstorm Warning	MEG	Calhoun	32 min
Apr 21, 6:35 PM CDT	Severe Thunderstorm Warning	BMX	Madison	55 min
Apr 21, 6:53 PM CDT	Severe Thunderstorm Warning	BMX	Lawrence, Morgan	67 min
Apr 21, 7:20 PM CDT	Severe Thunderstorm Warning	BMX	Limestone	55 min
Apr 21, 7:32 PM CDT	Severe Thunderstorm Warning	BMX	Madison	43 min

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 6.5 hours before the alert went out and 121 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: 465 J/kg
Mixed-layer CIN: -168 J/kg
Mixed-layer LCL: 1076 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: -64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 21, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 13 more	4 hr
Apr 21, 6:30 PM CDT	Severe Thunderstorm Watch	SPC	Blount, Colbert, Cullman, DeKalb, Etowah, Franklin and 11 more	5 hr
Apr 20, 10:00 PM CDT	Severe Thunderstorm Watch	SPC	Baxter, Boone, Carroll, Cleburne, Conway, Crawford and 19 more	5 hr
Apr 21, 2:15 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Bledsoe, Blount, Bradley, Campbell, Claiborne and 27 more	6 hr

Nearby

Severe Thunderstorm Watches in Tennessee, 1997 Severe Thunderstorm Watches in Mississippi, 1997 Severe Thunderstorm Watches in Alabama, 1997 Every severe thunderstorm watch in 1997

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.