Alert archive / Missouri / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 408, NWS St. Louis, MO

August 22, 2000Knox County, Lewis County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 22, 2000, 6:44 PM CDT for Knox County, Lewis County, Missouri. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Aug 22, 2000, 6:44 PM CDT (23:44 UTC)
Expired: Aug 22, 2000, 7:30 PM CDT
In force: 46 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Knox County, MO, Lewis County, MO

The radar

The St Louis radar (KLSX), 200 km from the middle of the area, began a volume at 23:45 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, 11.7 hours before the alert went out and 205 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: 1030 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 854 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 255 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 222344
SVRSTL
MOC103-111-230030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
644 PM CDT TUE AUG 22 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  KNOX COUNTY IN NORTHEAST MISSOURI
  LEWIS COUNTY IN NORTHEAST MISSOURI

* UNTIL 730 PM CDT

* AT 644 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR EDINA...MOVING EAST AT 30 MPH.

* LOCATIONS IN THE PATH...
  KNOX CITY
  COLONY
  LA BELLE
  LEWISTOWN
  EWING

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 4030 9228 4007 9238 3994 9161 4025 9151

T RUETT

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 Aug 22, 3:30 PM CDT, 3 hours 14 minutes earlier.

Area forecast discussion, Aug 22, 3:30 PM CDT, 3 hours 14 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
330 PM TUE AUG 22 2000

MAIN PROBS THIS PKG AGAIN WL BE POPS...AND TEMPS ON WED. SUM SHRA
AND EVEN A TS OR TWO DRAGGED ACROSS NRN ZNS LT THIS MRNG BUT SAT PICS
SHWG CLDS HV CLEARED OUT AND TEMPS HV WRMD INTO LWR AND MDL 90S BY
MIDAFTN. LTNG PLOT SHWG LN OF CNVNCTN DVLPG ALG IA-MO BDR ATTIM.

UA PTTN CONTS WITH 50H RDG OVR SRN US WITH VIGOROUS S/WV IN WRN
GTLKS MOVG NE. 50H HI PROGGED TO RETROGRADE TO CTRL RCKYMTNS WITH
RDG SE INTO FLA. UA FLOW OVR RGN TO VR MORE NWLY WITH CONTD SERIES
OF S/WVS MOVG ARND RDG INTO MEAN L/WV POSN OVR NE US.

MDLS SHWG DIFFS ON TIMING AND PLACEMENT OF PCPN. MESOETA OVRFCSTD
AMTS PAST 24H BUT LOCN WAS BETTER THAN NGM OR AVN. WL USE MESOETA
AGAIN FOR TIMING AND PLACEMENT OF PCPN. MAIN AREA OF CNVNCTN TNGT TO
BE N OF FA ACRS SRN GTLKS BUT LLJ RECHARGING OVR PLNS XPCT CHC OF
TSRA VCNTY OF FNTL BNDRY TO N WITH CORFIDI VECTORS BRNG S-SE ACRS
FA. WL CONT LO CHC POPS THRU WED NGT AND ACRS CTRL AND SRN ZNS ON
THU.

TEMPS A CONCERN ALSO FOR WED WITH WRM 85H ADVCTN AND SW FLO AT SFC.
XPCT MAXES AGAIN TMRW TO BE AS WRM AS TDA BUT LINGERING CLD CVR
COULD BIAS HI'S. WL ISSUE HT ADVSY FOR CITY OF STL FOR WED GIVEN
FCST TEMP/RH COMBO.

WL KP XTNDD DRY AS TIMING ON ANY S/WVS ACRS RGN IN NW FLOW VERY
DIFFICULT ATTIM. WL ADD POPS CLOSER TO OCCRNC.

COORD...EAX. TNX.

.STL...HEAT ADVSY FOR CITY OF fSTL FOR WED.

WDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 6:20 PM CDT	Severe Thunderstorm Warning	LSX	Knox	25 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2000 Every severe thunderstorm warning in 2000

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.