Alert archive / Illinois / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 175, NWS Lincoln, IL

August 23, 1999Fulton County, Peoria County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Aug 23, 1999, 5:49 PM CDT for Fulton County, Peoria County, Illinois. It was in force for 41 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, 5:49 PM CDT (22:49 UTC)
Expired: Aug 23, 1999, 6:30 PM CDT
In force: 41 min
Issued by: NWS Lincoln, IL
Area: Whole counties

Counties Fulton County, IL, Peoria County, IL

What was reported inside it

Time	Report	Where	Remark
Aug 23, 6:05 PM CDT	Thunderstorm Wind	Farmington, IL	Several large tree limbs and power lines were blown down.

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

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.8 hours before the alert went out and 118 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: 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

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 Lincoln, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 23, 2:40 PM CDT, 3 hours 9 minutes earlier.

Area forecast discussion, Aug 23, 2:40 PM CDT, 3 hours 9 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
240 PM CDT MON AUG 23 1999

CONCERNS ARE POSSIBLE SVR TSTMS NEXT 10 HRS AND PCPN AND TEMPS NEXT 48
HRS IS ANOTHER CONCERN.

LATEST SFC ANALYSIS SHOWS LOW PRESSURE IN THE UPPER MS VALLEY WITH A
COLD FRONT EXTENDED FROM SOUTHERN MN SOUTHWEST INTO CENTRAL PLAINS
STATES.  LATEST WV LOOP SHOWS VERY STRONG VORT MAX IN UPPER MS VALLEY
DIVING SOUTHEAST TOWARDS NORTHWEST ILLINOIS THIS EVENING. LATEST
SATELLITE ALSO SHOWING EXTENSIVE AC-CI DECK ACROSS THE NORTHERN CWA.
LATEST ADAP/MSAS/LAPS SHOWING INCREASE INSTABILITY OF LI/S -6 AND CAPES
NEAR 3000 J/KG IN EASTERN IOWA INTO NORTHWEST ILLINOIS. LATEST KDVN
RADAR SHOWING SOME STRONG/SVR STORMS FORMING A LINE OVER EASTERN IOWA.
KILX RADAR SHOWING SOME SHRA DEVELOPING OVER NORTHWEST CWA.

MODELS INITIALIZED WELL BUT BELIEVE ETA WAS A LITTLE BETTER. HOWEVER
AGAIN NGM HAS BEEN BETTER IN PAST SEVERAL RUNS. MODELS ARE IN FAIR
AGREEMENT WITH THE TROF MOVE EAST AND FORM A CUT OFF LOW NEXT 48 HRS.
WILL MAINLY GO WITH ETA SOLUTION IN SHORT RUN WHICH WAS A LITTLE BETTER
ON INTIALIZATION.  HOWEVER GOING WITH NGM SOLUTION ON THE LONGER RANGE
ON SOME OF PLACEMENT OF FEATURES.  AS SYSTEM CUTS OFF IT WILL SLOW TO
MOVE OUT. MODELS PLACING SOME 70H DRY AIR TOWARDS IOWA LATE THIS
AFTERNOON AND INTO NORTHERN MO THIS EVENING.  MID LEVEL SPEED MAX ALSO
EXPECTED TO MOVE NORTHERN MO THIS EVENING WHICH WILL ENHANCE POSSIBLE
SEVRE TSTMS IN NEXT 10 HRS.  MODELS ARE INDICATING THE SYSTEM WILL SLOW
DOWN. LATEST MODEL SOUNDINGS ARE ALSO INDICATING STILL REALTIVELY MOIST
AT MID LEVELS THRU 48HRS. EXPECT SOME SCATTERED SHOWERS TO CONTINUE
INTO WEDNESDAY AND POSSIBLY SOUTHEAST UNTIL END OF THE WEEK AS THE MRF
BRINGS IN NEXT IMPULSE TO MOVE IT OUT.

FOR TEMPERATURES...WILL GO WITH BLEND OF FWC/FAN NEXT 48 HRS BUT
LEANING TOWARDS COOLER FAN TEMPS.

EXTENDED COMPLEX AND TRICKY...TRIED AND PLACE THINGS AND COORDINATED
AS BEST AS POSSIBLE HOWEVER THE TASK IS NEXT TO IMPOSSIBLE.

COORDINATED WITH KCHI AND KDVN.

PRELIMINARY CCF

SPI WB 062/078 061/081 62 13843
PIA WB 062/077 061/081 62 13843
DEC WE 063/077 062/081 62 13843
CMI WE 062/077 061/080 62 13864
MTO WE 063/079 062/080 63 13864
LWV TE 063/079 063/081 63 13674

.ILX...NONE.

EH

In the hours before

Special weather statement, Aug 23, 11:55 AM CDT, 5 hours 54 minutes before

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Special weather statement, Aug 23, 11:55 AM CDT, 5 hours 54 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 23, 5:12 PM CDT	Severe Thunderstorm Warning	ILX	Knox	48 min
Aug 23, 6:18 PM CDT	Severe Thunderstorm Warning	ILX	Tazewell	42 min
Aug 23, 6:35 PM CDT	Severe Thunderstorm Warning	ILX	Mason	40 min
Aug 23, 6:45 PM CDT	Severe Thunderstorm Warning	ILX	Logan	45 min
Aug 23, 6:57 PM CDT	Severe Thunderstorm Warning	ILX	Tazewell	33 min
Aug 23, 6:59 PM CDT	Severe Thunderstorm Warning	ILX	Cass, Menard	46 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1999 Every 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.