Alert archive / Missouri / Tornado Watches in 1999

Tornado Watch 20

January 21, 19995 states

The Storm Prediction Center issued this tornado watch at Jan 21, 1999, 4:30 PM CST for 5 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jan 21, 1999, 4:30 PM CST (22:30 UTC)
Expired: Jan 21, 1999, 10:00 PM CST
In force: 6 hr
Issued by: the Storm Prediction Center

All 68 counties

Alexander County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saline County, IL, Union County, IL, Washington County, IL, White County, IL, Williamson County, IL, Posey County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Maries County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Osage County, MO, Perry County, MO, Phelps County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Texas County, MO, Washington County, MO, Wayne County, MO, Henry County, TN, Obion County, TN, Stewart County, TN, Weakley County, TN

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jan 21, 4:48 PM CST	Severe Thunderstorm Warning	PAH	Scott	47 min
Jan 21, 4:55 PM CST	Tornado Warning	PAH	Scott	35 min
Jan 21, 5:08 PM CST	Tornado Warning	PAH	Butler	32 min
Jan 21, 5:13 PM CST	Severe Thunderstorm Warning	PAH	Alexander, Union	47 min
Jan 21, 5:33 PM CST	Tornado Warning	PAH	Stoddard	47 min
Jan 21, 5:41 PM CST	Severe Thunderstorm Warning	LSX	Madison	49 min
Jan 21, 5:45 PM CST	Tornado Warning	PAH	New Madrid, Scott	50 min
Jan 21, 6:18 PM CST	Tornado Warning	PAH	Stoddard	32 min
Jan 21, 6:34 PM CST	Tornado Warning	PAH	Alexander	46 min
Jan 21, 6:48 PM CST	Tornado Warning	PAH	New Madrid, Stoddard	47 min
Jan 21, 6:58 PM CST	Tornado Warning	PAH	Butler	47 min
Jan 21, 7:00 PM CST	Tornado Warning	PAH	Union	50 min
Jan 21, 7:37 PM CST	Tornado Warning	PAH	Williamson	48 min
Jan 21, 7:45 PM CST	Tornado Warning	PAH	Butler, Stoddard, Wayne	45 min
Jan 21, 7:50 PM CST	Flash Flood Warning	PAH	Cape Girardeau, Scott, Stoddard	9 hr
Jan 21, 8:20 PM CST	Tornado Warning	MEG	Dyer, Obion	45 min
Jan 21, 8:25 PM CST	Flash Flood Warning	PAH	Franklin, Jackson, Union, Williamson	9 hr
Jan 21, 9:30 PM CST	Flash Flood Warning	PAH	Alexander	8 hr
Jan 21, 9:30 PM CST	Flash Flood Warning	PAH	Perry	8 hr
Jan 21, 9:30 PM CST	Flash Flood Warning	PAH	Bollinger, Butler, Wayne	8 hr
Jan 21, 9:30 PM CST	Flash Flood Warning	PAH	Perry	8 hr
Jan 21, 9:30 PM CST	Flash Flood Warning	PAH	Ripley	8 hr
Jan 21, 9:31 PM CST	Severe Thunderstorm Warning	PAH	New Madrid, Stoddard	49 min
Jan 21, 9:44 PM CST	Tornado Warning	PAH	Union, Williamson	31 min
Jan 21, 10:00 PM CST	Tornado Warning	PAH	Scott	35 min

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 10.5 hours before the alert went out and 312 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: 701 J/kg
Mixed-layer CIN: -198 J/kg
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 258 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Jan 21, 2:30 PM CST	Tornado Watch	SPC	Dunklin, Pemiscot	7 hr
Jan 21, 5:00 PM CST	Tornado Watch	SPC	Barry, Cedar, Christian, Dade, Dallas, Douglas and 13 more	5 hr
Jan 21, 4:30 PM CST	Tornado Watch	SPC	Benton, Carroll, Cheatham, Chester, Crockett, Decatur and 18 more	6 hr

Nearby

Tornado Watches in Missouri, 1999 Tornado Watches in Illinois, 1999 Tornado Watches in Kentucky, 1999 Every tornado watch in 1999

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.