Alert archive / Missouri / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 19, NWS St. Louis, MO

April 18, 1997Franklin County, Jefferson County, Saint Louis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 18, 1997, 8:07 PM CDT for Franklin County, Jefferson County, Saint Louis County, Missouri. It was in force for 38 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 18, 1997, 8:07 PM CDT (01:07 UTC)
Expired: Apr 18, 1997, 8:45 PM CDT
In force: 38 min
Issued by: NWS St. Louis, MO
Area: Whole counties

Counties Franklin County, MO, Jefferson County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 29 km from the middle of the area, began a volume at 01:11 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.

What was reported inside it

Time	Report	Where	Remark
Apr 18, 8:20 PM CDT	Hail 0.75	Eureka, MO
Apr 18, 8:25 PM CDT	Hail 1.75	De Soto, MO

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.1 hours before the alert went out and 262 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2539 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

101 
WUUS1 KSTL 190109 RRA
SVRSTL
MOC071-099-189-190145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
807 PM CDT FRI APR 18 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  845 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN EAST CENTRAL MISSOURI
 
   ...NORTHEAST FRANKLIN COUNTY...JEFFERSON COUNTY
   ...SOUTHERN ST. LOUIS COUNTY
 
AT 806 PM...WEATHER SERVICE RADAR INDICATED A SEVERE STORM ALONG THE
MISSOURI RIVER OVER NORTHEAST FRANKLIN COUNTY...ABOUT 10 MILES EAST OF
WASHINGTON.
 
THE STORM WAS MOVING EAST-SOUTHEAST AT 35 MPH.  TOWNS IN THE PATH OF THE
STORM INCLUDE EUREKA...FENTON...AND ARNOLD.
 
THIS IS A DANGEROUS STORM BE PREPARED FOR DAMAGING WINDS...HAIL
AND DEADLY LIGHTNING. STAY INSIDE AND AWAY FROM WINDOWS.
 
TRUETT

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 8:42 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Warren	33 min
Apr 18, 8:51 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	39 min
Apr 18, 8:58 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Pike, Ralls	47 min
Apr 18, 9:00 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Callaway	45 min
Apr 18, 9:45 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	45 min
Apr 18, 9:58 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	32 min
Apr 18, 9:58 PM CDT	Severe Thunderstorm Warning	LSX	City of Saint Louis	32 min
Apr 18, 10:07 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	38 min
Apr 18, 10:25 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	50 min
Apr 18, 10:54 PM CDT	Severe Thunderstorm Warning	LSX	Boone	51 min
Apr 19, 1:11 AM CDT	Severe Thunderstorm Warning	LSX	Franklin	34 min

Nearby

Severe Thunderstorm Warnings in Missouri, 1997 Every severe thunderstorm warning in 1997

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.