Alert archive / Missouri / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 339, NWS Springfield, MO

October 4, 1998St. Clair County, Missouri

NWS Springfield, MO issued this severe thunderstorm warning at Oct 4, 1998, 11:47 AM CDT for St. Clair County, Missouri. It was in force for 33 min. 1 report 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: Oct 4, 1998, 11:47 AM CDT (16:47 UTC)
Expired: Oct 4, 1998, 12:20 PM CDT
In force: 33 min
Issued by: NWS Springfield, MO
Area: Whole counties

County St. Clair County, MO

The radar

The Springfield radar (KSGF), 95 km from the middle of the area, began a volume at 16:50 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
Oct 4, 11:50 AM CDT	Hail 0.88	Appleton City, 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

Springfield, MO (KSGF), launched 12:00Z, 4.8 hours before the alert went out and 126 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: 1263 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 699 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

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

379 
WUUS1 KSGF 041648 RRA
SVRSGF
MOC185-041720-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1147 AM CDT SUN OCT 4 1998

THE NATIONAL WEATHER SERVICE IN SPRINGFIELD HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN ST. CLAIR COUNTY IN WEST CENTRAL MISSOURI

* UNTIL 1220 PM CDT

* AT 1146 AM DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
  OF PRODUCING LARGE HAIL THE SIZE OF QUARTERS.  THIS STORM WAS
  LOCATED 5 MILES SOUTH OF APPLETON CITY OR 20 MILES NORTHWEST OF
  OSCEOLA AND WAS MOVING NORTH NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  APPLETON CITY THROUGH 1215 PM


A SEVERE THUNDERSTORM WARNING MEANS THAT DAMAGING WINDS AND/OR LARGE
HAIL CAN BE EXPECTED.  SEEK SHELTER NOW AND REMAIN PROTECTED UNTIL THE
STORM HAS PASSED.

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 Springfield, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 4, 2:55 AM CDT, 8 hours 52 minutes earlier.

Area forecast discussion, Oct 4, 2:55 AM CDT, 8 hours 52 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPRINGFIELD MO
255 AM CDT SUN OCT 4 1998

LATEST SFC ANALYSIS INDCS A WK FNTL BNDRY ACRS SRN MO. BNRY IS BEST
DEFINED BY DIFFERENCE IN DWPNTS ACRS THE FA. DWPNTS RANGE FM THE
LOWER 50S ACRS CNTRL MO TO THE LOWER 60S ALONG THE MO/AR BORDER.

ALL THE MODELS THIS MRNG INDC THAT A SIG SVR WX OUTBREAK MAY BE
SHAPING UP FOR THE CNTRL AND SRN PLAINS STARTING THIS AFTN AND
CONTG INTO MON. STRONG UPR LOW OVR THE WRN U.S. IS FCST TO DIG SEWD
SOME MORE TODAY AND THEN LIFT NEWD TOWARD THE NRN PLAINS TNGT AND
MON. SEVERAL SHRT WVS ARE FCST TO EJECT NEWD OUT AHEAD OF MAIN UPR
LOW THROUGH MON. TIMING AND STRENGTH OF THESE SYSTEMS HANDLED A BIT
DIFFERENTLY BY EACH MODEL. WL LEAN MORE WITH THE ETA SOLUTION FOR
THIS FCST.

MAIN FCST PROBLEMS FOR THIS FCST PD WL BE SVR WX POTENTIAL...TEMPS
AND THE THREAT OF HVY RAINFALL.

DVLPG SFC LOW OVR SERN CO IS FCST TO LIFT NEWD AS WELL OVR THE NXT
24 TO 36 HRS. STRONG SLY LOW LVL FLOW WL DVLP ACRS MUCH OF THE FA
LATER TNGT AND CONT TNGT.

THE COMBINATION OF STRONG UPR DYNAMICS...GOOD INSTABILITY AND
INCRSG MOISTURE WL LEAD TO THE POTENTIAL OF SVR WX ACRS THE FA DURG
THIS FCST PD. FCST CAPES EXPECTED TO RANGE FM 500-1000 J/KG 00Z
TNGT...WITH HELICITY VALUES FM 500-600 M2/S2. LOOKS LIKE CONVECTION
WL ORGANIZE INTO A SQUALL LINE BY TNGT AS SYS APCHS FA.

WL STICK WITH CURRENT FCST OF 20-30% POPS TODAY ACRS MOST OF THE
FA. ANY TSRA DEVELOPMENT LOOKS TO BE THIS AFTN. WL GO WITH CAT POPS
ACRS MUCH OF THE FA TNGT AND INTO MON.

WL ISSUE A HAZARDOUS WX OUTLOOK ARND 5 AM TO HIGHLIGHT SVR WX
POTENTIAL. LATER SHIFTS WL HAVE TO CONSIDER A FLASH FLOOD WATCH FOR
MAINLY WRN HALF OF FA TNGT AND INTO MON.

RECOMMENDATIONS (FOR COORDINATION PURPOSES ONLY)

AIZ/VIH...
TODAY...VARAIBLE CLOUDINESS. A 40 PERCENT CHANCE OF SHOWERS AND
THUNDERSTORMS...MAINLY THIS AFTERNOON. HIGH FROM 75 TO 80. WIND
BECOMING SOUTH AND INCREASING TO 10 TO 15 MPH.

SE KS/JLN...VARIABLE CLOUDINESS AND BREEZY WITH A 30 PERCENT CHANCE
OF SHOWERS AND THUNDERSTORMS...MAINLY THIS AFTERNOON. HIGH NEAR 80.
WIND BECOMING SOUTH AND INCREASING TO 10 TO 20 MPH AND GUSTY.

SGF...VARIABLE CLOUDINESS.  A 20 PERCENT OF SHOWERS AND
THUNDERSTORMS MAILY IN THE AFTERNOON.  HIGH NEAR 80.  WIND
INCREASING TO SOUTH AT 10 TO 20 MPH AND GUSTY.

PUT WEST PLAINS 5 COUNTIES IN WITH THE CAPE...

CCF
SGF NT 079/065 071/057 065 09276
JLN NT 081/066 072/058 066 09487

RICKARD/GORDON/TAGGART

In the hours before

Local storm report, Oct 4, 10:24 AM CDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPRINGFIELD MISSOURI
1024 AM CDT SUN OCT 04 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0855 AM    HORTON                    MO   .75 INCH HAIL
10/04/98   VERNON

0930 AM    LAMAR                     MO   .75 INCH HAIL
10/04/98   BARTON

Local storm report, Oct 4, 10:24 AM CDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPRINGFIELD MISSOURI
1024 AM CDT SUN OCT 04 1998

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0855 AM    HORTON                    MO   .75 INCH HAIL
10/04/98   VERNON

0930 AM    LAMAR                     MO   .75 INCH HAIL
10/04/98   BARTON

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 4, 8:18 AM CDT	Severe Thunderstorm Warning	SGF	Vernon	47 min
Oct 4, 8:41 AM CDT	Severe Thunderstorm Warning	SGF	Barton, Jasper	64 min
Oct 4, 8:51 AM CDT	Flash Flood Warning	SGF	Vernon	3 hr
Oct 4, 9:04 AM CDT	Severe Thunderstorm Warning	SGF	Vernon	36 min
Oct 4, 9:37 AM CDT	Flash Flood Warning	SGF	Barton	3 hr
Oct 4, 9:46 AM CDT	Severe Thunderstorm Warning	SGF	Barton	49 min
Oct 4, 10:01 AM CDT	Severe Thunderstorm Warning	SGF	Cedar, Vernon	59 min
Oct 4, 10:56 AM CDT	Severe Thunderstorm Warning	SGF	St. Clair	49 min
Oct 4, 12:01 PM CDT	Flash Flood Warning	SGF	Vernon	119 min
Oct 4, 12:24 PM CDT	Flash Flood Warning	SGF	St. Clair	4 hr

Nearby

Severe Thunderstorm Warnings in Missouri, 1998 Every severe thunderstorm warning in 1998

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.