Alert archive / Illinois / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 114, NWS Paducah, KY
NWS Paducah, KY issued this severe thunderstorm warning at Aug 18, 2001, 6:17 PM CDT for Franklin County, Illinois. It was in force for 43 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 18, 2001, 6:17 PM CDT (23:17 UTC)
- Expired
- Aug 18, 2001, 7:00 PM CDT
- In force
- 43 min
- Issued by
- NWS Paducah, KY
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Franklin County, IL
The radar
The Paducah radar (KPAH), 104 km from the middle of the area, began a volume at 23:19 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 18, 6:20 PM CDT | Thunderstorm Wind 50 E | Rend Lake South, IL | Numerous trees and large branches were down. The damage was associated with outflow winds from a severe supercell thunderstorm that tracked across southern Jefferson County. |
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 18, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 11.3 hours before the alert went out and 242 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
- 192 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 1002 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Paducah, KY wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 1:20 PM CDT, 4 hours 57 minutes earlier.
Area forecast discussion, Aug 18, 1:20 PM CDT, 4 hours 57 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PADUCAH KY 120 PM CDT SAT AUG 18 2001 MAIN FORECAST CONCERN IS POTENTIAL FOR SEVERE THUNDERSTORMS THIS EVENING. THEREAFTER...A DRY WEEK IS SHAPING UP FOR THE FORECAST AREA. LATEST 18Z SURFACE ANALYSIS HAD LOW PRESSURE OVER SOUTHERN WISCONSIN WITH ANOTHER LOW DEVELOPING IN NORTHWEST ILLINOIS. FROM THE SECOND LOW...A WARM FRONT WAS EVIDENT ACROSS CENTRAL ILLINOIS AND INDIANA...WITH A COLD FRONT TRAILING SOUTHWEST ACROSS MISSOURI AND SOUTHEAST KANSAS. 12Z UPPER AIR ANALYSIS HAD A 564MB LOW OVER WESTERN WISCONSIN AND ASSOCIATED 50 KNOT JET DIVING SOUTHEAST ACROSS THE UPPER MIDWEST. AT MIDDAY...MOST OF THE FORECAST AREA WAS BASKING IN PLENTY OF SUNSHINE. THIS HAS HELPED TO BOOST TEMPERATURES INTO THE LOWER AND MIDDLE 80S...WITH MSAS LI/S OF -7 TO -9 OVER MUCH OF SOUTHERN ILLINOIS AND SOUTHEAST MISSOURI. THROUGH THE REST OF THE AFTERNOON...THE AIR MASS WILL CONTINUE TO DESTABILIZE. THIS COMBINED WITH INCREASING SHEAR AHEAD OF THE APPROACHING SHORTWAVE SHOULD GIVE THE REGION A ROUND OF STRONG AND SEVERE THUNDERSTORMS...NAMELY LATE THIS AFTERNOON AND THIS EVENING. BY MIDNIGHT...THE SURFACE COLD FRONT IS FORECAST TO STRETCH ACROSS SOUTHWEST INDIANA AND WESTERN KENTUCKY...WITH ANY LINGERING CONVECTION FROM THERE ON EASTWARD. SUNDAY LOOKS PARTLY SUNNY AS LOW-LEVEL MOISTURE LINGERS BEHIND THE DEPARTING LOW. FOR THE REST OF THE WEEK...MRF STILL TAKES THE RIDGE CURRENTLY OVER THE WESTERN U.S. AND SHIFTS IT EAST. SO A DRY WEEK IS EXPECTED WITH A MODERATION TO NEAR OR JUST ABOVE SEASONAL NORMS BY THE MIDDLE PART OF THE WEEK. DESPITE THE LATEST MRF RUN...WILL KEEP THE LATE WEEK PERIOD PARTLY CLOUDY BUT DRY SINCE THE EVENTUAL TRACK OF CHANTAL REMAINS UNCERTAIN AND IS SEVERAL DAYS OUT. MOS OUTPUT FROM BOTH NGM/AVN LOOK REASONABLE AND COMPARE FAVORABLY WELL...SO WILL FOLLOW CLOSELY. THE ONLY EXCEPTION TO THIS WOULD BE POPS FOR THIS EVENING...WHICH APPEAR TO BE UNDERDONE BY BOTH MODELS. FIRST-PERIOD ZONE BREAKOUT AND WORDING WILL LIKELY BE DICTATED BY WATCH BOXES IN EFFECT AT PRESS TIME. RIGHT NOW...PLAN TO EMPHASIZE SEVERE THREAT INCLUDING BOTH LARGE HAIL AND DAMAGING WINDS OVER THE ENTIRE AREA FOR THE EVENING HOURS. .PAH...NONE. RJP
The office that day
Everything else NWS Paducah, KY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 5:37 PM CDT | Severe Thunderstorm Warning | PAH | Jefferson | 53 min |
| Aug 18, 5:53 PM CDT | Tornado Warning | PAH | Jefferson | 37 min |
| Aug 18, 6:40 PM CDT | Severe Thunderstorm Warning | PAH | Hamilton | 50 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2001Every severe thunderstorm warning in 2001
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.