Alert archive / Missouri / Flash Flood Warnings in 1999

Flash Flood Warning 4, NWS St. Louis, MO

April 3, 19994 counties in Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 3, 1999, 5:57 PM CST for 4 counties in Missouri. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 3, 1999, 5:57 PM CST (23:57 UTC)
Expired: Apr 3, 1999, 10:00 PM CST
In force: 4 hr
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties Iron County, MO, Madison County, MO, Reynolds County, MO, Saint Francois County, MO

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 12.0 hours before the alert went out and 290 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: 1749 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 744 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 268 m²/s²
0-3 km storm-relative helicity: 294 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 6.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 032356
FFWSTL
MOC093-123-179-187-040400-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
557 PM CST SAT APR 3 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 3, 6:42 AM CST	Severe Thunderstorm Warning	LSX	Iron, Reynolds	33 min
Apr 3, 8:12 AM CST	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis	48 min
Apr 3, 8:49 AM CST	Flash Flood Warning	LSX	Iron, Madison, Saint Francois	3 hr
Apr 3, 8:49 AM CST	Flash Flood Warning	LSX	Sainte Genevieve	3 hr
Apr 3, 11:48 AM CST	Flash Flood Warning	LSX	Iron, Madison, Sainte Genevieve, Saint Francois	6 hr
Apr 3, 5:12 PM CST	Severe Thunderstorm Warning	LSX	Crawford	48 min

Nearby

Flash Flood Warnings in Missouri, 1999 Every flash flood warning 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.