Alert archive / Tennessee / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 271
The Storm Prediction Center issued this severe thunderstorm watch at May 21, 2001, 7:00 PM EDT for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 21, 2001, 7:00 PM EDT (23:00 UTC)
- Expired
- May 22, 2001, 12:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 67 counties
Floyd County, KY, Harlan County, KY, Knott County, KY, Letcher County, KY, Martin County, KY, Pike County, KY, Cherokee County, NC, Clay County, NC, Graham County, NC, Haywood County, NC, Jackson County, NC, Macon County, NC, Madison County, NC, Mitchell County, NC, Swain County, NC, Yancey County, NC, Anderson County, TN, Blount County, TN, Bradley County, TN, Carter County, TN, Claiborne County, TN, Cocke County, TN, Grainger County, TN, Greene County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Johnson County, TN, Knox County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Roane County, TN, Sevier County, TN, Sullivan County, TN, Unicoi County, TN, Union County, TN, Washington County, TN, Bland County, VA, Buchanan County, VA, City of Bristol, VA, City of Norton, VA, Dickenson County, VA, Giles County, VA, Lee County, VA, Russell County, VA, Scott County, VA, Smyth County, VA, Tazewell County, VA, Washington County, VA, Wise County, VA, Boone County, WV, Fayette County, WV, Greenbrier County, WV, Lincoln County, WV, Logan County, WV, McDowell County, WV, Mercer County, WV, Mingo County, WV, Monroe County, WV, Raleigh County, WV, Summers County, WV, Wyoming County, WV
The radar
The Knoxville radar (KMRX), 27 km from the middle of the area, began a volume at 23:00 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
20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:05 PM EDT | Severe Thunderstorm Warning | RLX | Lincoln | 25 min |
| May 21, 7:08 PM EDT | Severe Thunderstorm Warning | MRX | McMinn, Meigs | 37 min |
| May 21, 7:11 PM EDT | Severe Thunderstorm Warning | MRX | Monroe | 49 min |
| May 21, 7:23 PM EDT | Severe Thunderstorm Warning | MRX | Loudon | 37 min |
| May 21, 7:25 PM EDT | Severe Thunderstorm Warning | MRX | Hancock | 50 min |
| May 21, 7:37 PM EDT | Severe Thunderstorm Warning | MRX | Blount, Knox | 53 min |
| May 21, 7:42 PM EDT | Severe Thunderstorm Warning | MRX | Sullivan | 48 min |
| May 21, 8:05 PM EDT | Severe Thunderstorm Warning | MRX | Grainger, Union | 40 min |
| May 21, 8:12 PM EDT | Severe Thunderstorm Warning | MRX | Hawkins | 48 min |
| May 21, 8:16 PM EDT | Severe Thunderstorm Warning | MRX | Jefferson | 44 min |
| May 21, 8:18 PM EDT | Severe Thunderstorm Warning | MRX | Sullivan | 42 min |
| May 21, 8:18 PM EDT | Severe Thunderstorm Warning | MRX | City of Bristol | 42 min |
| May 21, 8:23 PM EDT | Severe Thunderstorm Warning | MRX | Sevier | 52 min |
| May 21, 8:26 PM EDT | Severe Thunderstorm Warning | MRX | Hamblen | 49 min |
| May 21, 8:30 PM EDT | Severe Thunderstorm Warning | MRX | Knox | 30 min |
| May 21, 8:34 PM EDT | Severe Thunderstorm Warning | RNK | Greenbrier | 41 min |
| May 21, 8:39 PM EDT | Severe Thunderstorm Warning | MRX | Cocke, Greene | 66 min |
| May 21, 8:42 PM EDT | Severe Thunderstorm Warning | MRX | Grainger | 33 min |
| May 21, 8:56 PM EDT | Severe Thunderstorm Warning | MRX | Hawkins | 49 min |
| May 21, 9:14 PM EDT | Severe Thunderstorm Warning | MRX | Sullivan | 46 min |
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 11.0 hours before the alert went out and 294 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
- 322 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 454 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| May 20, 10:30 PM EDT | Severe Thunderstorm Watch | SPC | Fulton | 6 hr |
| May 21, 6:30 PM EDT | Tornado Watch | SPC | Boyd, Carter, Greenup | 5 hr |
Nearby
Severe Thunderstorm Watches in Tennessee, 2001Severe Thunderstorm Watches in Virginia, 2001Severe Thunderstorm Watches in West Virginia, 2001Every severe thunderstorm watch in 2001
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.