Alert archive / Missouri / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 64, NWS St. Louis, MO

May 18, 1997Knox County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 18, 1997, 7:11 AM CDT for Knox County, Missouri. It was in force for 49 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: May 18, 1997, 7:11 AM CDT (12:11 UTC)
Expired: May 18, 1997, 8:00 AM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Knox County, MO

The radar

The St Louis radar (KLSX), 203 km from the middle of the area, began a volume at 12:12 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

Davenport, (KDVN), launched 12:00Z, 0.2 hours before the alert went out and 216 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: 1986 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 266 m²/s²
0-3 km storm-relative helicity: 293 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.

835 
WUUS1 KSTL 181212 RRA
SVRSTL
MOC103-181300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
711 AM CDT SUN MAY 18 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  800 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHEAST MISSOURI
 
   ...SOUTHERN KNOX COUNTY
 
AT 710 AM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE
THUNDERSTORM LOCATED 5 MILES SOUTHWEST OF EDINA IN KNOX COUNTY. THIS
STORM WAS MOVING TO THE EAST SOUTHEAST AT 30 MPH. THE MAIN THREAT OF
SEVERE WEATHER FROM THIS STORM IS LARGE HAIL AND POSSIBLE DAMAGING
WINDS.
 
THE STORM WILL CONTINUE TO MOVE ACROSS SOUTHERN KNOX COUNTY BETWEEN
NOW AND 745 AM. THERE ARE NO MAJOR COMMUNITIES IN THE PATH...MOSTLY
RURAL AREAS.
 
THIS IS A DANGEROUS STORM BE PREPARED FOR DAMAGING WINDS...HAIL
AND DEADLY LIGHTNING. STAY INSIDE AND AWAY FROM WINDOWS.
 
PEDIGO

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 8:21 PM CDT	Severe Thunderstorm Warning	LSX	Washington	69 min
May 17, 8:48 PM CDT	Severe Thunderstorm Warning	LSX	Saint Francois	57 min
May 17, 9:03 PM CDT	Severe Thunderstorm Warning	LSX	Iron	42 min
May 17, 9:44 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	31 min
May 17, 9:49 PM CDT	Tornado Warning	LSX	Crawford	26 min
May 17, 10:05 PM CDT	Severe Thunderstorm Warning	LSX	Washington	40 min
May 17, 10:13 PM CDT	Severe Thunderstorm Warning	LSX	Crawford	47 min
May 18, 12:15 AM CDT	Severe Thunderstorm Warning	LSX	Franklin	45 min
May 18, 7:42 AM CDT	Severe Thunderstorm Warning	LSX	Clark	48 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.