Alert archive / Missouri / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 51, NWS St. Louis, MO

April 5, 1999Madison County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 5, 1999, 4:17 PM CDT for Madison County, Missouri. It was in force for 48 min. 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 5, 1999, 4:17 PM CDT (21:17 UTC)
Expired
Apr 5, 1999, 5:05 PM CDT
In force
48 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Madison County, MO

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 5, 4:00 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 9.3 hours before the alert went out and 297 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 12:00Z on 1999-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 1999-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1263 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
230 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Apr 5, 11:25 AM CDT, 4 hours 52 minutes before
ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026-
027-034>036-041-042-047>052-059>065-072>075-084-085-099-052300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1125 AM CDT MON APR 5 1999

THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE
IN ST. LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND
EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS.

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS THE AREA
THIS AFTERNOON AND TONIGHT.  A VERY STRONG UPPER LEVEL DISTURBANCE
WILL BE COMBINING WITH WARM AND UNSTABLE AIR TO PRODUCE WIDESPREAD
THUNDERSTORM ACTIVITY FROM MID TO LATE AFTERNOON INTO THE EVENING.

ALTHOUGH THUNDERSTORMS WILL BE POSSIBLE ABOUT ANY TIME...IT APPEARS
THAT THE GREATEST THREAT OF SEVERE THUNDERSTORMS WILL BE DURING THE
LATE AFTERNOON AND EARLY EVENING HOURS.

IN ADDITION...THE HEAVY RAIN ASSOCIATED WITH THESE STORMS WILL BRING
A THREAT OF FLASH FLOODING TO PARTS OF THE REGION.  THE AREA OF
GREATEST CONCERN IS THE AREA THAT RECEIVED HEAVY RAIN ON
SATURDAY...GENERALLY ALONG AND TO THE EAST OF A ROLLA-TROY MISSOURI
LINE.   A FLASH FLOOD WATCH IS IN EFFECT FOR THIS PORTION OF THE
AREA.

SKYWARN ACTIVATION MAY BECOME NECESSARY THIS AFTERNOON AND THIS
EVENING.  EMERGENCY MANAGERS AND STORM SPOTTER GROUPS ARE URGED TO
CAREFULLY MONITOR WEATHER DEVELOPMENTS THROUGHOUT THE DAY.

GLASS
Special weather statement, Apr 5, 11:25 AM CDT, 4 hours 52 minutes before
ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026-
027-034>036-041-042-047>052-059>065-072>075-084-085-099-052300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1125 AM CDT MON APR 5 1999

THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE
IN ST. LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST AND
EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS.

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS THE AREA
THIS AFTERNOON AND TONIGHT.  A VERY STRONG UPPER LEVEL DISTURBANCE
WILL BE COMBINING WITH WARM AND UNSTABLE AIR TO PRODUCE WIDESPREAD
THUNDERSTORM ACTIVITY FROM MID TO LATE AFTERNOON INTO THE EVENING.

ALTHOUGH THUNDERSTORMS WILL BE POSSIBLE ABOUT ANY TIME...IT APPEARS
THAT THE GREATEST THREAT OF SEVERE THUNDERSTORMS WILL BE DURING THE
LATE AFTERNOON AND EARLY EVENING HOURS.

IN ADDITION...THE HEAVY RAIN ASSOCIATED WITH THESE STORMS WILL BRING
A THREAT OF FLASH FLOODING TO PARTS OF THE REGION.  THE AREA OF
GREATEST CONCERN IS THE AREA THAT RECEIVED HEAVY RAIN ON
SATURDAY...GENERALLY ALONG AND TO THE EAST OF A ROLLA-TROY MISSOURI
LINE.   A FLASH FLOOD WATCH IS IN EFFECT FOR THIS PORTION OF THE
AREA.

SKYWARN ACTIVATION MAY BECOME NECESSARY THIS AFTERNOON AND THIS
EVENING.  EMERGENCY MANAGERS AND STORM SPOTTER GROUPS ARE URGED TO
CAREFULLY MONITOR WEATHER DEVELOPMENTS THROUGHOUT THE DAY.

GLASS

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 5, 5:08 PM CDTSevere Thunderstorm WarningLSXRandolph32 min
Apr 5, 6:26 PM CDTTornado WarningLSXAdams49 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1999Every severe thunderstorm 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.