Alert archive / Illinois / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 146, NWS Paducah, KY

September 9, 2001Jefferson County, Illinois

NWS Paducah, KY issued this severe thunderstorm warning at Sep 9, 2001, 12:55 AM CDT for Jefferson County, Illinois. It was in force for 50 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: Sep 9, 2001, 12:55 AM CDT (05:55 UTC)
Expired: Sep 9, 2001, 1:45 AM CDT
In force: 50 min
Issued by: NWS Paducah, KY
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Jefferson County, IL

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.9 hours before the alert went out and 207 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: 41 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 1461 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

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 Sep 8, 2:00 PM CDT, 10 hours 55 minutes earlier.

Area forecast discussion, Sep 8, 2:00 PM CDT, 10 hours 55 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PADUCAH KY
200 PM CDT SAT SEP 8 2001

LINE OF STORMS THAT CROSSED THE FORECAST AREA THIS MORNING HAS
STABILIZED THE ATMOSPHERE. SUBSIDENCE IN THE WAKE OF THE DEPARTING
SHORTWAVE MAY ALSO BE KEEPING A LID ON DEVELOPMENT THIS AFTERNOON.
MAIN FORECAST CONCERN IN THE SHORT TERM IS WHEN CONVECTION WILL
RETURN. WITH 20 TO 30 KNOT LOW LEVEL JET...ABUNDANT DEEP
MOISTURE...AND A FEW MORE HOURS OF SURFACE HEATING...SCATTERED
SHOWERS OR STORMS ARE EXPECTED TO FORM THIS AFTERNOON. MOST LIKELY
AREA IS SE MISSOURI...WHERE THE ATMOSPHERE HAS HAD THE MOST TIME TO
RECOVER FROM MORNING CONVECTION.

A GOOD CHANCE OF SHOWERS AND STORMS WILL RETURN TO THE ENTIRE
FORECAST AREA TONIGHT. SATELLITE IMAGERY SHOWS WIDESPREAD CONVECTION
OVER THE CENTRAL GULF COAST REGION...MOVING NORTH THROUGH THE LOWER
MISSISSIPPI VALLEY. THIS GULF MOISTURE INFLOW IS ASSOCIATED WITH A
WEAK SHORTWAVE OVER TEXAS. THIS LEAD SHORTWAVE WILL LIFT NORTHEAST
TOWARD THE LOWER OHIO VALLEY TONIGHT...BRINGING GULF MOISTURE WITH
IT.

ETA/NGM/AVN ARE ALL TRENDING FASTER WITH THE STRONG SHORTWAVE AND
ASSOCIATED COLD FRONT OVER THE PLAINS. MODELS DEVELOP A WEAK SURFACE
LOW OVER CENTRAL MISSOURI BY 12Z SUNDAY...THEN TRACK IT NORTHEAST
INTO THE GREAT LAKES SUNDAY NIGHT. THE TRAILING COLD FRONT CROSSES
THE LOWER OHIO VALLEY LATE SUNDAY AFTERNOON OR EVENING. PASSAGE OF
THE COLD FRONT AROUND THE WARMEST TIME OF DAY FAVORS WIDESPREAD
COVERAGE OF THUNDERSTORMS. WIND PROFILES FROM MODEL SOUNDINGS ARE
UNIDIRECTIONAL FROM 30 TO 45 KNOTS...INDICATING POTENTIAL FOR WIND
IN STORMS THAT BOW. SEVERE THREAT WILL BE STRONGLY INFLUENCED BY THE
EXTENT OF CLOUDS AND SHOWERS DURING THE MORNING.

AVN STILL INSISTS ON SIGNIFICANTLY COOLER AND DRIER AIR FOR EARLY
NEXT WEEK. 60 HOUR ETA ALSO IS POINTING IN THIS DIRECTION...SHOWING
SFC DEW POINTS IN THE 50S ON MONDAY. THE REFRESHING CHANGE OF AIR
MASS /SFC DEW POINTS IN THE MID 50S/ IS MAKING GOOD INROADS INTO NW
MISSOURI AT THIS TIME. WILL STAY CLOSE TO THE MRF MOS /MEX/ NUMBERS
DURING THE EXTENDED...WHICH SHOW LOWS IN THE 50S AND HIGHS AROUND
80.

.PAH...NONE.

MY

In the hours before

Local storm report, Sep 8, 7:01 PM CDT, 5 hours 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PADUCAH KY
701 PM CDT SAT SEP 08 2001

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

0649 PM    ELLSINORE                 MO   0.75 INCH HAIL
09/08/01   CARTER                         REPORTED BY THE PUBLIC

The office that day

Everything else NWS Paducah, KY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 8, 7:44 PM CDT	Severe Thunderstorm Warning	PAH	Daviess	31 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2001 Every 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; the sounding from the Mesonet's radiosonde archive.