Alert archive / Missouri / Severe Thunderstorm Watches in 2001
Severe Thunderstorm Watch 261
The Storm Prediction Center issued this severe thunderstorm watch at May 20, 2001, 9:30 PM CDT for 5 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 20, 2001, 9:30 PM CDT (02:30 UTC)
- Expired
- May 21, 2001, 3:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 45 counties
Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, St. Francis County, AR, Woodruff County, AR, Alexander County, IL, Jackson County, IL, Perry County, IL, Randolph County, IL, Union County, IL, Fulton County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Crawford County, MO, Dunklin County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO, Dyer County, TN, Fayette County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Shelby County, TN, Tipton County, TN
The radar
The Paducah radar (KPAH), 114 km from the middle of the area, began a volume at 02:31 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
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 10:03 PM CDT | Tornado Warning | LSX | Reynolds | 42 min |
| May 20, 10:06 PM CDT | Severe Thunderstorm Warning | MEG | Crittenden | 39 min |
| May 20, 10:24 PM CDT | Severe Thunderstorm Warning | PAH | Alexander | 21 min |
| May 20, 10:26 PM CDT | Severe Thunderstorm Warning | MEG | Mississippi | 34 min |
| May 20, 10:44 PM CDT | Severe Thunderstorm Warning | MEG | Tipton | 46 min |
| May 20, 10:46 PM CDT | Tornado Warning | LSX | Iron, Madison | 44 min |
| May 21, 12:10 AM CDT | Severe Thunderstorm Warning | LZK | Prairie, Woodruff | 65 min |
The nearest sounding before it
Little Rock, AR (KLZK), launched 00:00Z, 2.5 hours before the alert went out and 226 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
- 2153 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 1093 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 242 m²/s²
- Significant tornado parameter
- 2.7
- Supercell composite
- 13.2
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, 7:45 PM CDT | Tornado Watch | SPC | Fulton | 5 hr |
| May 20, 11:00 PM CDT | Tornado Watch | SPC | Arkansas, Benton, Carroll, Clark, Cleburne, Cleveland and 38 more | 4 hr |
| May 21, 5:30 PM CDT | Tornado Watch | SPC | Boyd, Carter, Greenup | 5 hr |
| May 21, 6:00 PM CDT | Severe Thunderstorm Watch | SPC | Floyd, Harlan, Knott, Letcher, Martin, Pike | 5 hr |
Nearby
Severe Thunderstorm Watches in Missouri, 2001Severe Thunderstorm Watches in Arkansas, 2001Severe Thunderstorm Watches in Tennessee, 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.