Alert archive / Arkansas / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 210

May 11, 201751 counties in Arkansas; 17 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at May 11, 2017, 3:17 PM CDT for 51 counties in Arkansas; 17 counties in Missouri. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 11, 2017, 3:17 PM CDT (20:17 UTC)
Expired
May 11, 2017, 10:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 68 counties

Arkansas County, AR, Baxter County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lawrence County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Marion County, AR, Monroe County, AR, Montgomery County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Butler County, MO, Carter County, MO, Christian County, MO, Douglas County, MO, Dunklin County, MO, Greene County, MO, Howell County, MO, Oregon County, MO, Ozark County, MO, Ripley County, MO, Shannon County, MO, Stoddard County, MO, Taney County, MO, Texas County, MO, Wayne County, MO, Webster County, MO, Wright County, MO

The radar

The Little Rock radar (KLZK), 106 km from the middle of the area, began a volume at 20:17 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
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 11, 3:36 PM CDTSevere Thunderstorm WarningLZKFulton, Izard39 min
May 11, 3:36 PM CDTSevere Thunderstorm WarningLZKJohnson, Logan39 min
May 11, 3:43 PM CDTSevere Thunderstorm WarningLZKIndependence, Sharp47 min
May 11, 3:54 PM CDTSevere Thunderstorm WarningSGFChristian, Douglas, Taney51 min
May 11, 3:59 PM CDTSevere Thunderstorm WarningLZKMarion46 min
May 11, 4:04 PM CDTSevere Thunderstorm WarningLZKBaxter, Izard, Stone41 min
May 11, 4:11 PM CDTTornado WarningSGFChristian, Greene, Lawrence49 min
May 11, 4:15 PM CDTTornado WarningLZKBaxter, Marion30 min
May 11, 4:26 PM CDTSevere Thunderstorm WarningSGFChristian, Douglas, Webster, Wright45 min
May 11, 4:27 PM CDTSevere Thunderstorm WarningSGFChristian, Greene, Stone63 min
May 11, 4:30 PM CDTTornado WarningSGFChristian, Greene, Stone32 min
May 11, 4:31 PM CDTFlash Flood WarningLZKJohnson, Logan, Pope2 hr
May 11, 4:36 PM CDTSevere Thunderstorm WarningLZKBaxter, Marion39 min
May 11, 4:38 PM CDTSevere Thunderstorm WarningLZKIzard, Sharp19 min
May 11, 4:38 PM CDTSevere Thunderstorm WarningSGFOregon52 min
May 11, 4:45 PM CDTSevere Thunderstorm WarningLZKSharp30 min
May 11, 5:00 PM CDTFlash Flood WarningMEGLawrence, Randolph3 hr
May 11, 5:21 PM CDTSevere Thunderstorm WarningSGFChristian, Douglas, Greene, Webster, Wright54 min
May 11, 5:24 PM CDTSevere Thunderstorm WarningLZKIzard, Sharp51 min
May 11, 5:30 PM CDTSevere Thunderstorm WarningPAHRipley34 min
May 11, 5:59 PM CDTFlash Flood WarningMEGCraighead2 hr
May 11, 6:03 PM CDTSevere Thunderstorm WarningMEGCraighead42 min
May 11, 6:09 PM CDTSevere Thunderstorm WarningSGFTexas41 min
May 11, 6:13 PM CDTFlash Flood WarningMEGDunklin, Pemiscot6 hr
May 11, 6:20 PM CDTSevere Thunderstorm WarningSGFHowell, Oregon55 min
May 11, 6:40 PM CDTSevere Thunderstorm WarningSGFShannon44 min
May 11, 7:07 PM CDTSevere Thunderstorm WarningMEGCraighead, Mississippi, Poinsett22 min
May 11, 7:09 PM CDTFlash Flood WarningLZKIndependence, Izard, Sharp, Stone3 hr
May 11, 8:10 PM CDTFlash Flood WarningPAHCarter110 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

Springfield, MO (KSGF), launched 12:00Z, 8.3 hours before the alert went out and 182 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, Springfield, MO at 12:00Z on 2017-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Springfield, MO at 12:00Z on 2017-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1011 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 11, 12:56 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more8 hr
May 11, 1:37 PM CDTMesoscale DiscussionSPCHempstead, Howard, Lafayette, Little River, Miller, Sevier2 hr
May 11, 2:43 PM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more9 hr
May 11, 2:49 PM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clark, Cleburne and 34 more116 min
May 11, 5:49 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Boone, Bradley, Calhoun, Carroll and 56 more56 min
May 11, 6:07 PM CDTMesoscale DiscussionSPCBenton, Washington83 min

Nearby

Severe Thunderstorm Watches in Arkansas, 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.