Alert archive / Missouri / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 158

May 9, 201611 counties in Illinois; 7 counties in Kentucky; 14 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2016, 8:16 PM CDT for 11 counties in Illinois; 7 counties in Kentucky; 14 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 9, 2016, 8:16 PM CDT (01:16 UTC)
Expired
May 10, 2016, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 32 counties

Alexander County, IL, Gallatin County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Saline County, IL, Union County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, McCracken County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Iron County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

The radar

The Paducah radar (KPAH), 111 km from the middle of the area, began a volume at 01:18 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
40%
One or more gusts of 65 knots or more
5%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 9, 8:19 PM CDTSevere Thunderstorm WarningPAHRipley41 min
May 9, 8:45 PM CDTSevere Thunderstorm WarningPAHButler, Ripley45 min
May 9, 8:55 PM CDTSevere Thunderstorm WarningPAHCarter, Wayne50 min
May 9, 9:27 PM CDTSevere Thunderstorm WarningPAHBollinger, Butler, New Madrid, Stoddard, Wayne48 min
May 9, 9:54 PM CDTSevere Thunderstorm WarningPAHFulton51 min
May 9, 10:23 PM CDTSevere Thunderstorm WarningPAHAlexander, Pulaski37 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, 1.3 hours before the alert went out and 241 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 2016-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 606 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 2016-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 289 square meters per square second.1939587897117Sfc1 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
606 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
834 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
289 m²/s²
0-3 km storm-relative helicity
399 m²/s²
Significant tornado parameter
1.1
Supercell composite
15.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 9:42 PM CDTMesoscale DiscussionSPCAlexander, Hardin, Johnson, Massac, Pope, Pulaski and 2 more93 min
May 10, 7:01 AM CDTMesoscale DiscussionSPCFranklin, Gallatin, Hamilton, Jackson, Jefferson, Monroe and 9 more104 min
May 10, 12:59 PM CDTSevere Thunderstorm WatchSPCAlexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more9 hr
May 10, 3:08 PM CDTMesoscale DiscussionSPCAlexander, Massac, Pulaski67 min
May 10, 5:06 PM CDTTornado WatchSPCGallatin, Hardin, Massac, Pope, Saline6 hr
May 10, 12:38 PM CDTMesoscale DiscussionSPCAnderson, Bath, Boone, Bourbon, Boyle, Bracken and 50 more67 min
May 10, 3:44 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Boone, Bourbon and 49 more61 min
May 10, 5:19 PM CDTMesoscale DiscussionSPCBoyd, Breathitt, Carter, Clay, Elliott, Estill and 23 more86 min
May 10, 5:52 PM CDTSevere Thunderstorm WatchSPCBath, Bell, Boyd, Breathitt, Carter, Clay and 31 more7 hr
May 9, 7:23 PM CDTTornado WatchSPCDunklin, Pemiscot8 hr
May 9, 7:33 PM CDTMesoscale DiscussionSPCAtchison, Holt57 min
May 9, 10:06 PM CDTMesoscale DiscussionSPCAtchison, Holt, Nodaway54 min
May 9, 10:37 PM CDTMesoscale DiscussionSPCBarry, Barton, Cedar, Christian, Dade, Dallas and 10 more83 min

Nearby

Severe Thunderstorm Watches in Missouri, 2016Severe Thunderstorm Watches in Illinois, 2016Severe Thunderstorm Watches in Kentucky, 2016Every severe thunderstorm watch in 2016

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.