Alert archive / Missouri / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 184, NWS St. Louis, MO

July 28, 1999Sainte Genevieve County, Missouri; Randolph County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 28, 1999, 11:54 AM CDT for Sainte Genevieve County, Missouri; Randolph County, Illinois. It was in force for 36 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
Jul 28, 1999, 11:54 AM CDT (16:54 UTC)
Expired
Jul 28, 1999, 12:30 PM CDT
In force
36 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Randolph County, IL, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 100 km from the middle of the area, began a volume at 16:58 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.

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 4.9 hours before the alert went out and 350 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 1999-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 884 joules per kilogram.LCLLFCEL10008507005003002001001 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 1999-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939Sfc1 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
884 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
1482 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
36 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

NWS St. Louis, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 28, 3:10 AM CDT, 8 hours 44 minutes earlier.

Area forecast discussion, Jul 28, 3:10 AM CDT, 8 hours 44 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
310 AM CDT WED JUL 28 1999

MODELS HAVE RDG RE-BUILDING ALG ROCKIES WITH HGTS INCRSG IN MO.
850MB TEMPS APPEAR TO BE NEARLY STEADY IN THE 22-24 RANGE...THIS
WILL TRANSLATE SFC TEMPS IN THE MID 90S.  ALSO DPTMP IN THE MID 70S
WILL GIVE A LITTLE RELIF ACR AREA. INSTABILITY INDICES SHWD A FEW
ISOLATED TSTMS COULD DEVELOP THIS AFTN AND INTO THE EVE HOURS...WITH
LESS THEN 10% AREA WILL BE LEFT OUT THE FCST.  STL FWC SHWD 99 DGRS
AND 97 IN COU...WTH LESS CLOUDS AND LITTLE OR NO RN LOOKS OK.  CONT
HEAT ADVISORY THRU THURSDAY.

.STL...HEAT ADVSRY FOR ALL OF CWA THRU THURSDAY.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 12:11 PM CDTSevere Thunderstorm WarningLSXMadison34 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1999Severe Thunderstorm Warnings in Illinois, 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; radar from the NEXRAD Level II archive.