Alert archive / Arkansas / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 73

March 9, 201729 counties in Arkansas; Dunklin County, Pemiscot County, Missouri; 21 counties in Tennessee

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.

IssuedProductOfficeCountiesLasted
Mar 9, 7:14 PM CSTSevere Thunderstorm WarningMEGClay31 min
Mar 9, 7:18 PM CSTSevere Thunderstorm WarningLZKBaxter, Boone, Marion57 min
Mar 9, 7:33 PM CSTSevere Thunderstorm WarningMEGClay, Randolph42 min
Mar 9, 7:44 PM CSTTornado WarningLZKBoone31 min
Mar 9, 7:44 PM CSTSevere Thunderstorm WarningMEGClay46 min
Mar 9, 7:56 PM CSTTornado WarningLZKBaxter, Marion25 min
Mar 9, 8:00 PM CSTSevere Thunderstorm WarningMEGPemiscot45 min
Mar 9, 8:10 PM CSTSevere Thunderstorm WarningMEGClay, Greene, Lawrence, Randolph50 min
Mar 9, 8:12 PM CSTTornado WarningLZKBoone, Marion18 min
Mar 9, 8:28 PM CSTSevere Thunderstorm WarningLZKBaxter, Boone, Marion, Searcy47 min
Mar 9, 8:34 PM CSTSevere Thunderstorm WarningMEGPemiscot41 min
Mar 9, 8:45 PM CSTSevere Thunderstorm WarningMEGGibson, Obion, Weakley45 min
Mar 9, 8:52 PM CSTSevere Thunderstorm WarningMEGObion23 min
Mar 9, 8:58 PM CSTSevere Thunderstorm WarningLZKBaxter, Marion, Searcy, Stone, Van Buren47 min
Mar 9, 9:10 PM CSTSevere Thunderstorm WarningMEGHenry50 min
Mar 9, 9:29 PM CSTSevere Thunderstorm WarningMEGCarroll, Gibson, Henderson, Madison, Weakley61 min
Mar 9, 9:32 PM CSTSevere Thunderstorm WarningMEGHenderson, Madison43 min
Mar 9, 9:35 PM CSTSevere Thunderstorm WarningLZKCleburne, Independence, Izard, Stone, White40 min
Mar 9, 9:37 PM CSTSevere Thunderstorm WarningMEGBenton38 min
Mar 9, 9:41 PM CSTTornado WarningLZKCleburne, Independence, Stone, White34 min
Mar 9, 9:57 PM CSTSevere Thunderstorm WarningMEGHenderson34 min
Mar 9, 10:00 PM CSTSevere Thunderstorm WarningMEGDecatur45 min
Mar 9, 10:06 PM CSTTornado WarningMEGBenton, Carroll, Decatur, Henderson24 min
Mar 9, 10:07 PM CSTTornado WarningMEGHenderson21 min
Mar 9, 10:11 PM CSTSevere Thunderstorm WarningLZKIndependence, Jackson, White, Woodruff49 min
Mar 9, 10:16 PM CSTSevere Thunderstorm WarningMEGCraighead, Cross, Greene, Lawrence, Mississippi, Poinsett44 min
Mar 9, 10:19 PM CSTTornado WarningMEGDecatur26 min
Mar 9, 10:34 PM CSTSevere Thunderstorm WarningMEGChester, Decatur, Hardin, Henderson, McNairy, Madison41 min
Mar 9, 10:41 PM CSTFlash Flood WarningMEGChester, Crockett, Haywood, Henderson, Madison3 hr
Mar 9, 10:50 PM CSTSevere Thunderstorm WarningLZKWoodruff25 min
Mar 9, 11:25 PM CSTSevere Thunderstorm WarningLZKConway, Perry35 min
Mar 9, 11:26 PM CSTSevere Thunderstorm WarningMEGShelby34 min
Mar 9, 11:46 PM CSTSevere Thunderstorm WarningMEGFayette, Shelby44 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.

Skew-T log-pSkew-T log-p diagram, Little Rock, AR at 00:00Z on 2017-03-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 445 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Little Rock, AR at 00:00Z on 2017-03-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
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

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 9, 9:30 PM CSTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Conway, Craighead, Crawford and 27 more90 min
Mar 9, 6:39 PM CSTMesoscale DiscussionSPCChickasaw, Choctaw, Clarke, Clay, Covington, Itawamba and 17 more96 min
Mar 9, 10:42 PM CSTMesoscale DiscussionSPCAlcorn, Benton, DeSoto, Itawamba, Lafayette, Lee and 8 more63 min
Mar 9, 11:18 PM CSTSevere Thunderstorm WatchSPCAlcorn, Benton, Coahoma, DeSoto, Itawamba, Lafayette and 11 more4 hr
Mar 10, 12:50 AM CSTMesoscale DiscussionSPCCalhoun, Chickasaw, Grenada, Itawamba, Lafayette, Lee and 8 more85 min
Mar 9, 7:58 PM CSTMesoscale DiscussionSPCBedford, Cannon, Cheatham, Coffee, Davidson, Dickson and 23 more92 min
Mar 9, 8:38 PM CSTSevere Thunderstorm WatchSPCBedford, Cannon, Cheatham, Coffee, Davidson, DeKalb and 24 more4 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.