Alert archive / Missouri / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 218, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 23, 1999, 3:52 PM CDT for Clark County, Scotland County, Missouri. It was in force for 63 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
- Aug 23, 1999, 3:52 PM CDT (20:52 UTC)
- Expired
- Aug 23, 1999, 4:55 PM CDT
- In force
- 63 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Clark County, MO, Scotland County, MO
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 23, 2:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 8.9 hours before the alert went out and 179 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1307 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Aug 23, 3:00 PM CDT, 52 minutes earlier.
Area forecast discussion, Aug 23, 3:00 PM CDT, 52 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE ST LOUIS MO 300 PM CDT MON AUG 23 1999 WATER VAPOR AND STLT IMAGERY SHWG UNSEASONABLY STG UPR LOW CONTG TO DIGG RAPIDLY SEWD WITH 19Z PSN NR THE CNTRL IA/MN BORDER. ASSOCD SFC FNT HAS MOVD INTO NW MO WITH FAIRLY XTNSV CU FIELD IN ADVANCE OF THE FNT WITHIN AXIS OF MDTLY UNSTBL AIR. INTENSE MID/UPR JET IN SW QUAD AND NOW NOSING INTO NW MO INDCT UPR LOW SHUD CONT DIGG SEWD MUCH AS PROGGED BY MDLS WITH LRG SCALE LIFT ONLY IMPVG FOR THE RMNDR OF THE AFT INTO THE EVNG HRS OVR NE/EC MO INTO IL. RIGHT NOW JUST WAITING FOR STRMS TO CONT DVLPG. STG WNDS ALF AND FVRBL DP LYR SHR /0-6KM/ CONT TO SUPPORT THREAT OF ORGANIZED SVR STRMS WITH DAMAGING WNDS THE GREATEST SVR THREAT. ANY POTNTL FOR SUPERCELLS ATTM WUD APPEAR TO BE OVR NE MO INTO WC IL COUNTIES WHERE LOW LVL SHEAR PROFILES ARE BTR. STMRS WHICH DO DVLP SHUD MOV QUICKLY SE AND THINK THAT MOST OF THE CWFA SHUD BE OUT OF THE WOODS BY MIDNIGHT OR SO. WL DCRS THE AMT OF CLDS FOR TNGT FM PRVS FCST BHD THE FNT. THERE ARE SOME STORMS AND CLDS IMMEDIATELY BENEATH THE UPR SYS BUT FOR THE MOST PART...ALOT OF DRY AIR IS BEING ADVECTED SE. THE MDLS ARE GETTING IN BTR AGREEMENT FOR THE RMNDR OF THE FCST ALTHO CONT TO EXHIBIT VARIANCES WITH RESPECT TO EXACT PSN OF THE UPR LOW...AND THIS IS THE MOST CRITICAL PART OF THE FCST FOR ERN MO AND WRN IL. ETA RMNS THE MOST PROGRSV OF THE SHRT RNG MDLS WITH THE LOW IN CNTRL IL BY 12Z TUE...ADVANCING INTO ERN INDIANA BY 12Z WED. WITH THIS PSN IT IS DOWNPLAYING THE WRAP ANRD LOW LVL MSTR... SC DVLPMNT IN THE CD AIR...AND HENCE ANY THREAT OF -SHRA. NGM/AVN SLOW THINGS DOWN A BIT TMW THEN BCM MORE PROGRSV WITH THE SYS LATE TMW NGT INTO WED. NGM EVEN INDCTG LESSER THREAT OF CLDS AND BACKWASH INSTABILITY -SHRA. WHILE I THINK SC DVLPMNT IS A PRETTY GUD BET TMW ACRS THE CWFA... SPCLY NE AND FAR EAST SXNS...MY CONFIDENCE LVL IN PCPN IS NOT VERY HI SO FAR WEST OF THE UPR LOW BACK INTO MO. ATTM WL RETAIN CURRENT FCST OF LOW POPS IN ERN MO ZNS INTO IL. WHILE AVN FCST OF VORT LOBES ROTG ABT LOW AND INTO MO BEAR WATCHING...OVERALL...UPR SYS SHUD HV LESSENING EFFECT ON WX ACRS MO IN THE LATER PDS AS UPR COLD POOL RETREATS TO THE EAST. RIGHT NOW WILL TAKE IT ONE DAY AT A TIME AS FOR PCPN CHCS. .STL...NONE GLASS
In the hours before
Special weather statement, Aug 23, 11:15 AM CDT, 4 hours 37 minutes before
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</html>Special weather statement, Aug 23, 11:15 AM CDT, 4 hours 37 minutes before
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<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
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The site you requested is temporarily down for maintenance or an unexpected outage.
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<p id="message2">
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</html>The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 5:22 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis | 48 min |
| Aug 23, 6:32 PM CDT | Severe Thunderstorm Warning | LSX | Marion | 48 min |
| Aug 23, 6:48 PM CDT | Severe Thunderstorm Warning | LSX | Ralls | 47 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 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.