Alert archive / Arkansas / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 81
The Storm Prediction Center issued this severe thunderstorm watch at Mar 24, 2017, 9:14 PM CDT for 19 counties in Arkansas; 9 parishes in Louisiana. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 24, 2017, 9:14 PM CDT (02:14 UTC)
- Expired
- Mar 25, 2017, 3:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 28 counties
Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA, Webster Parish, LA
The radar
The Shreveport radar (KSHV), 101 km from the middle of the area, began a volume at 02:14 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
- 5%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 9:32 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Lafayette | 43 min |
| Mar 24, 10:30 PM CDT | Severe Thunderstorm Warning | LZK | Garland, Grant, Hot Spring, Pulaski, Saline | 45 min |
| Mar 24, 10:46 PM CDT | Tornado Warning | SHV | Bienville, Bossier, De Soto, Red River | 44 min |
| Mar 24, 11:00 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Grant, Jackson, Natchitoches, Red River, Sabine and 1 more | 60 min |
| Mar 25, 12:00 AM CDT | Severe Thunderstorm Warning | SHV | Bienville, Caldwell, Grant, Jackson, Natchitoches, Ouachita and 1 more | 60 min |
| Mar 25, 12:03 AM CDT | Tornado Warning | SHV | Jackson | 27 min |
| Mar 25, 12:19 AM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Jefferson, Prairie | 41 min |
| Mar 25, 12:58 AM CDT | Severe Thunderstorm Warning | LZK | Arkansas, Monroe | 47 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
Shreveport, LA (KBAD), launched 00:00Z, 2.2 hours before the alert went out and 93 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
- 24 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 1519 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 276 m²/s²
- 0-3 km storm-relative helicity
- 418 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 24, 8:39 PM CDT | Mesoscale Discussion | SPC | Columbia, Lafayette, Miller, Nevada, Ouachita | 66 min |
| Mar 24, 9:36 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Clay, Cleburne, Conway and 29 more | 54 min |
| Mar 24, 11:41 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot | 64 min |
| Mar 25, 12:05 AM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 5 hr |
| Mar 25, 1:05 AM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 115 min |
| Mar 24, 9:23 PM CDT | Tornado Watch | SPC | Caldwell, De Soto, Grant, LaSalle, Natchitoches, Red River and 2 more | 6 hr |
| Mar 24, 9:58 PM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Evangeline, Jefferson Davis, Rapides and 2 more | 62 min |
| Mar 24, 10:28 PM CDT | Tornado Watch | SPC | Allen, Beauregard, Calcasieu, Evangeline, Jefferson Davis, Rapides and 1 more | 6 hr |
| Mar 25, 2:08 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 6 more | 67 min |
| Mar 25, 3:06 AM CDT | Mesoscale Discussion | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Richland and 1 more | 54 min |
| Mar 25, 5:25 AM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Vernon | 2 hr |
| Mar 25, 12:08 PM CDT | Mesoscale Discussion | SPC | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more | 3 hr |
Nearby
Severe Thunderstorm Watches in Arkansas, 2017Severe Thunderstorm Watches in Louisiana, 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.