Alert archive / Missouri / Severe Thunderstorm Watches in 2008

Severe Thunderstorm Watch 397

May 30, 200825 counties in Illinois; 38 counties in Indiana; 40 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at May 30, 2008, 9:58 PM CDT for 25 counties in Illinois; 38 counties in Indiana; 40 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 30, 2008, 9:58 PM CDT (02:58 UTC)
Expired: May 31, 2008, 3:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 103 counties

Bond County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Jasper County, IL, Jefferson County, IL, Lawrence County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Perry County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, Bartholomew County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Fayette County, IN, Franklin County, IN, Gibson County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Union County, IN, Vermillion County, IN, Vigo County, IN, Wayne County, IN, Barry County, MO, Benton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dade County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Hickory County, MO, Jasper County, MO, Jefferson County, MO, Laclede County, MO, Lawrence County, MO, Maries County, MO, McDonald County, MO, Miller County, MO, Morgan County, MO, Newton County, MO, Osage County, MO, Phelps County, MO, Polk County, MO, Pulaski County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Warren County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The St Louis radar (KLSX), 26 km from the middle of the area, began a volume at 03:00 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: 30%
One or more gusts of 65 knots or more: 20%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 30, 9:58 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Clinton, Fayette, Madison	47 min
May 30, 10:03 PM CDT	Tornado Warning	IND	Henry, Rush	24 min
May 30, 10:10 PM CDT	Tornado Warning	ILN	Fayette, Union, Wayne	35 min
May 30, 10:10 PM CDT	Severe Thunderstorm Warning	SGF	Barton, Cedar, Dade	65 min
May 30, 10:21 PM CDT	Severe Thunderstorm Warning	LSX	Madison, Monroe, Saint Clair	39 min
May 30, 10:24 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Maries, Phelps, Pulaski	66 min
May 30, 10:25 PM CDT	Severe Thunderstorm Warning	SGF	Dade, Dallas, Greene, Polk	65 min
May 30, 10:28 PM CDT	Severe Thunderstorm Warning	IND	Clay, Hendricks, Morgan, Parke, Putnam, Vigo	42 min
May 30, 10:39 PM CDT	Severe Thunderstorm Warning	IND	Hamilton, Hancock, Hendricks, Johnson, Marion, Morgan and 1 more	51 min
May 30, 10:41 PM CDT	Flash Flood Warning	IND	Hendricks, Marion	3 hr
May 30, 10:43 PM CDT	Severe Thunderstorm Warning	SGF	Camden, Miller	62 min
May 30, 10:56 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	49 min
May 30, 10:58 PM CDT	Severe Thunderstorm Warning	SGF	Dade, Greene, Lawrence	47 min
May 30, 10:59 PM CDT	Severe Thunderstorm Warning	IND	Hancock, Henry, Madison, Rush, Shelby	46 min
May 30, 11:06 PM CDT	Severe Thunderstorm Warning	IND	Johnson, Morgan, Shelby	39 min
May 30, 11:18 PM CDT	Flash Flood Warning	LSX	Clinton, Monroe, Saint Clair, Washington	6 hr
May 30, 11:19 PM CDT	Severe Thunderstorm Warning	IND	Henry, Randolph	26 min
May 30, 11:24 PM CDT	Severe Thunderstorm Warning	ILN	Fayette, Union, Wayne	51 min
May 30, 11:29 PM CDT	Severe Thunderstorm Warning	IND	Decatur, Rush, Shelby	46 min
May 30, 11:55 PM CDT	Severe Thunderstorm Warning	ILN	Dearborn, Franklin, Ripley	50 min
May 31, 12:03 AM CDT	Tornado Warning	ILN	Fayette, Union	42 min
May 31, 12:25 AM CDT	Severe Thunderstorm Warning	IND	Clay, Owen	31 min
May 31, 12:42 AM CDT	Tornado Warning	IND	Monroe, Owen	33 min
May 31, 12:46 AM CDT	Severe Thunderstorm Warning	ILN	Franklin	44 min
May 31, 1:00 AM CDT	Severe Thunderstorm Warning	IND	Brown, Johnson, Monroe, Morgan	34 min
May 31, 1:31 AM CDT	Severe Thunderstorm Warning	IND	Bartholomew, Johnson, Shelby	29 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

Lincoln, IL (KILX), launched 00:00Z, 3.0 hours before the alert went out and 253 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1830 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 984 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 9:16 PM CDT	Mesoscale Discussion	SPC	Bond, Calhoun, Christian, Clark, Clay, Clinton and 31 more	29 min
May 30, 11:35 PM CDT	Mesoscale Discussion	SPC	Bond, Clark, Clay, Clinton, Coles, Crawford and 23 more	55 min
May 31, 1:38 AM CDT	Mesoscale Discussion	SPC	Champaign, DeWitt, Ford, Iroquois, Livingston, Logan and 8 more	2 hr
May 30, 7:39 PM CDT	Mesoscale Discussion	SPC	Barton, Bates, Benton, Camden, Cedar, Cooper and 15 more	66 min
May 31, 7:26 AM CDT	Mesoscale Discussion	SPC	Jasper, McDonald, Newton	2 hr
May 31, 8:53 AM CDT	Severe Thunderstorm Watch	SPC	Barry, Christian, Jasper, Lawrence, McDonald, Newton and 3 more	5 hr
May 31, 10:01 AM CDT	Mesoscale Discussion	SPC	Barry, McDonald, Newton	59 min
May 31, 4:29 PM CDT	Mesoscale Discussion	SPC	Bates, Benton, Boone, Callaway, Camden, Carroll and 29 more	91 min

Nearby

Severe Thunderstorm Watches in Missouri, 2008 Severe Thunderstorm Watches in Indiana, 2008 Severe Thunderstorm Watches in Illinois, 2008 Every severe thunderstorm watch in 2008

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.