Alert archive / Illinois / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 221, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Aug 23, 1999, 6:48 PM CDT for Pike County, Illinois; Ralls County, Missouri. It was in force for 47 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
- Aug 23, 1999, 6:48 PM CDT (23:48 UTC)
- Expired
- Aug 23, 1999, 7:35 PM CDT
- In force
- 47 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Pike County, IL, Ralls County, MO
The radar
The St Louis radar (KLSX), 107 km from the middle of the area, began a volume at 23:51 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 |
|---|---|---|---|
| Aug 23, 6:55 PM CDT | Thunderstorm Wind 55 | Ilasco, 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 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 |
| Aug 23, 6:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 11.8 hours before the alert went out and 231 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
- 1950 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 232347 RRA SVRSTL ILC149-MOC173-240035- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 648 PM CDT MON AUG 23 1999 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN PIKE COUNTY ILLINOIS IN WEST CENTRAL ILLINOIS NORTHERN RALLS COUNTY IN NORTHEASTERN MISSOURI * UNTIL 735 PM CDT * AT 646 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM JUST NORTHWEST OF HANNIBAL... MOVING SOUTHEAST AT 30 MPH. * LOCATIONS THAT WILL BE AFFECTED... BARRY KINDERHOOK NEW CANTON SAVERTON RENSSELEAR SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 60 MPH...DAMAGING HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OR YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. GKS/FG
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, 3 hours 48 minutes earlier.
Area forecast discussion, Aug 23, 3:00 PM CDT, 3 hours 48 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
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 3:52 PM CDT | Severe Thunderstorm Warning | LSX | Clark, Scotland | 63 min |
| 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 |
Nearby
Severe Thunderstorm Warnings in Illinois, 1999Severe 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.