Alert archive / Missouri / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 470

June 20, 200029 counties in Illinois; Lee County, Iowa; 32 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Jun 20, 2000, 5:30 PM CDT for 29 counties in Illinois; Lee County, Iowa; 32 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 20, 2000, 5:30 PM CDT (22:30 UTC)
Expired: Jun 20, 2000, 11:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 62 counties

Lee County, IA, Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, DeWitt County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Henderson County, IL, Knox County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Woodford County, IL, Adair County, MO, Audrain County, MO, Boone County, MO, Callaway County, MO, Carroll County, MO, Chariton County, MO, Clark County, MO, Cooper County, MO, Grundy County, MO, Henry County, MO, Howard County, MO, Johnson County, MO, Knox County, MO, Lafayette County, MO, Lewis County, MO, Lincoln County, MO, Linn County, MO, Livingston County, MO, Macon County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Pettis County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saline County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO, Sullivan County, MO

The radar

The St Louis radar (KLSX), 169 km from the middle of the area, began a volume at 22:30 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.

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 20, 5:35 PM CDT	Severe Thunderstorm Warning	EAX	Cass, Johnson	85 min
Jun 20, 5:43 PM CDT	Severe Thunderstorm Warning	ILX	Cass	62 min
Jun 20, 5:53 PM CDT	Severe Thunderstorm Warning	EAX	Saline	52 min
Jun 20, 5:58 PM CDT	Severe Thunderstorm Warning	LSX	Pike	62 min
Jun 20, 6:13 PM CDT	Tornado Warning	LSX	Pike	47 min
Jun 20, 6:16 PM CDT	Severe Thunderstorm Warning	ILX	Menard	59 min
Jun 20, 6:20 PM CDT	Severe Thunderstorm Warning	EAX	Randolph	25 min
Jun 20, 6:21 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	39 min
Jun 20, 6:32 PM CDT	Severe Thunderstorm Warning	ILX	Scott	58 min
Jun 20, 6:37 PM CDT	Severe Thunderstorm Warning	LSX	Audrain	38 min
Jun 20, 6:40 PM CDT	Tornado Warning	ILX	Logan	65 min
Jun 20, 6:42 PM CDT	Severe Thunderstorm Warning	ILX	Knox	63 min
Jun 20, 6:48 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Shelby	42 min
Jun 20, 6:53 PM CDT	Severe Thunderstorm Warning	ILX	Morgan	67 min
Jun 20, 6:53 PM CDT	Severe Thunderstorm Warning	LSX	Ralls	52 min
Jun 20, 7:11 PM CDT	Severe Thunderstorm Warning	ILX	Fulton	64 min
Jun 20, 7:18 PM CDT	Severe Thunderstorm Warning	ILX	Sangamon	57 min
Jun 20, 7:19 PM CDT	Severe Thunderstorm Warning	LSX	Adams	41 min
Jun 20, 7:23 PM CDT	Tornado Warning	ILX	DeWitt, Macon	67 min
Jun 20, 7:28 PM CDT	Severe Thunderstorm Warning	ILX	Mason, Tazewell	62 min
Jun 20, 7:28 PM CDT	Severe Thunderstorm Warning	ILX	Peoria	62 min
Jun 20, 7:36 PM CDT	Flash Flood Warning	ILX	Logan	3 hr
Jun 20, 8:00 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Morgan, Schuyler	60 min
Jun 20, 8:00 PM CDT	Severe Thunderstorm Warning	ILX	Scott	60 min
Jun 20, 8:06 PM CDT	Severe Thunderstorm Warning	ILX	Marshall, Woodford	54 min
Jun 20, 8:13 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Macon	62 min
Jun 20, 8:13 PM CDT	Severe Thunderstorm Warning	ILX	Logan	62 min
Jun 20, 8:14 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Warren	46 min
Jun 20, 8:29 PM CDT	Severe Thunderstorm Warning	ILX	DeWitt	61 min
Jun 20, 9:35 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	25 min
Jun 20, 10:08 PM CDT	Severe Thunderstorm Warning	ILX	Christian, Shelby	67 min

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 222 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: 557 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 646 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 324 m²/s²
0-3 km storm-relative helicity: 373 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 7.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 6:45 PM CDT	Severe Thunderstorm Watch	SPC	Bond, Clinton, Fayette, Jefferson, Jersey, Macoupin and 7 more	4 hr
Jun 19, 7:45 PM CDT	Severe Thunderstorm Watch	SPC	Plymouth	5 hr
Jun 20, 12:30 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Cass, Dallas, Fremont and 11 more	6 hr
Jun 20, 2:30 PM CDT	Severe Thunderstorm Watch	SPC	Andrew, Buchanan, Caldwell, Cass, Clay, Clinton and 9 more	7 hr

Nearby

Severe Thunderstorm Watches in Missouri, 2000 Severe Thunderstorm Watches in Illinois, 2000 Severe Thunderstorm Watches in Iowa, 2000 Every severe thunderstorm watch in 2000

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.