Alert archive / Arkansas / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 73
The Storm Prediction Center issued this severe thunderstorm watch at Mar 9, 2017, 6:42 PM CST for 29 counties in Arkansas; Dunklin County, Pemiscot County, Missouri; 21 counties in Tennessee. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 9, 2017, 6:42 PM CST (00:42 UTC)
- Expired
- Mar 10, 2017, 12:00 AM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 52 counties
Baxter County, AR, Boone County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Faulkner County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Marion County, AR, Mississippi County, AR, Newton County, AR, Poinsett County, AR, Pope County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Dunklin County, MO, Pemiscot County, MO, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur 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, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN
The radar
The Memphis radar (KNQA), 154 km from the middle of the area, began a volume at 00:45 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
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
33 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 9, 7:14 PM CST | Severe Thunderstorm Warning | MEG | Clay | 31 min |
| Mar 9, 7:18 PM CST | Severe Thunderstorm Warning | LZK | Baxter, Boone, Marion | 57 min |
| Mar 9, 7:33 PM CST | Severe Thunderstorm Warning | MEG | Clay, Randolph | 42 min |
| Mar 9, 7:44 PM CST | Tornado Warning | LZK | Boone | 31 min |
| Mar 9, 7:44 PM CST | Severe Thunderstorm Warning | MEG | Clay | 46 min |
| Mar 9, 7:56 PM CST | Tornado Warning | LZK | Baxter, Marion | 25 min |
| Mar 9, 8:00 PM CST | Severe Thunderstorm Warning | MEG | Pemiscot | 45 min |
| Mar 9, 8:10 PM CST | Severe Thunderstorm Warning | MEG | Clay, Greene, Lawrence, Randolph | 50 min |
| Mar 9, 8:12 PM CST | Tornado Warning | LZK | Boone, Marion | 18 min |
| Mar 9, 8:28 PM CST | Severe Thunderstorm Warning | LZK | Baxter, Boone, Marion, Searcy | 47 min |
| Mar 9, 8:34 PM CST | Severe Thunderstorm Warning | MEG | Pemiscot | 41 min |
| Mar 9, 8:45 PM CST | Severe Thunderstorm Warning | MEG | Gibson, Obion, Weakley | 45 min |
| Mar 9, 8:52 PM CST | Severe Thunderstorm Warning | MEG | Obion | 23 min |
| Mar 9, 8:58 PM CST | Severe Thunderstorm Warning | LZK | Baxter, Marion, Searcy, Stone, Van Buren | 47 min |
| Mar 9, 9:10 PM CST | Severe Thunderstorm Warning | MEG | Henry | 50 min |
| Mar 9, 9:29 PM CST | Severe Thunderstorm Warning | MEG | Carroll, Gibson, Henderson, Madison, Weakley | 61 min |
| Mar 9, 9:32 PM CST | Severe Thunderstorm Warning | MEG | Henderson, Madison | 43 min |
| Mar 9, 9:35 PM CST | Severe Thunderstorm Warning | LZK | Cleburne, Independence, Izard, Stone, White | 40 min |
| Mar 9, 9:37 PM CST | Severe Thunderstorm Warning | MEG | Benton | 38 min |
| Mar 9, 9:41 PM CST | Tornado Warning | LZK | Cleburne, Independence, Stone, White | 34 min |
| Mar 9, 9:57 PM CST | Severe Thunderstorm Warning | MEG | Henderson | 34 min |
| Mar 9, 10:00 PM CST | Severe Thunderstorm Warning | MEG | Decatur | 45 min |
| Mar 9, 10:06 PM CST | Tornado Warning | MEG | Benton, Carroll, Decatur, Henderson | 24 min |
| Mar 9, 10:07 PM CST | Tornado Warning | MEG | Henderson | 21 min |
| Mar 9, 10:11 PM CST | Severe Thunderstorm Warning | LZK | Independence, Jackson, White, Woodruff | 49 min |
| Mar 9, 10:16 PM CST | Severe Thunderstorm Warning | MEG | Craighead, Cross, Greene, Lawrence, Mississippi, Poinsett | 44 min |
| Mar 9, 10:19 PM CST | Tornado Warning | MEG | Decatur | 26 min |
| Mar 9, 10:34 PM CST | Severe Thunderstorm Warning | MEG | Chester, Decatur, Hardin, Henderson, McNairy, Madison | 41 min |
| Mar 9, 10:41 PM CST | Flash Flood Warning | MEG | Chester, Crockett, Haywood, Henderson, Madison | 3 hr |
| Mar 9, 10:50 PM CST | Severe Thunderstorm Warning | LZK | Woodruff | 25 min |
| Mar 9, 11:25 PM CST | Severe Thunderstorm Warning | LZK | Conway, Perry | 35 min |
| Mar 9, 11:26 PM CST | Severe Thunderstorm Warning | MEG | Shelby | 34 min |
| Mar 9, 11:46 PM CST | Severe Thunderstorm Warning | MEG | Fayette, Shelby | 44 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
Little Rock, AR (KBYH), launched 00:00Z, 0.7 hours before the alert went out and 186 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
- 445 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 583 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 312 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 6.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 9, 9:30 PM CST | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Crawford and 27 more | 90 min |
| Mar 9, 6:39 PM CST | Mesoscale Discussion | SPC | Chickasaw, Choctaw, Clarke, Clay, Covington, Itawamba and 17 more | 96 min |
| Mar 9, 10:42 PM CST | Mesoscale Discussion | SPC | Alcorn, Benton, DeSoto, Itawamba, Lafayette, Lee and 8 more | 63 min |
| Mar 9, 11:18 PM CST | Severe Thunderstorm Watch | SPC | Alcorn, Benton, Coahoma, DeSoto, Itawamba, Lafayette and 11 more | 4 hr |
| Mar 10, 12:50 AM CST | Mesoscale Discussion | SPC | Calhoun, Chickasaw, Grenada, Itawamba, Lafayette, Lee and 8 more | 85 min |
| Mar 9, 7:58 PM CST | Mesoscale Discussion | SPC | Bedford, Cannon, Cheatham, Coffee, Davidson, Dickson and 23 more | 92 min |
| Mar 9, 8:38 PM CST | Severe Thunderstorm Watch | SPC | Bedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 24 more | 4 hr |
Nearby
Severe Thunderstorm Watches in Arkansas, 2017Severe Thunderstorm Watches in Tennessee, 2017Severe Thunderstorm Watches in Missouri, 2017Every severe thunderstorm watch in 2017
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.