Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 61, NWS Quad Cities, IA
NWS Quad Cities, IA issued this severe thunderstorm warning at May 20, 1998, 8:50 AM CDT for Lee County, Iowa; Hancock County, Illinois. It was in force for 45 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
- May 20, 1998, 8:50 AM CDT (13:50 UTC)
- Expired
- May 20, 1998, 9:35 AM CDT
- In force
- 45 min
- Issued by
- NWS Quad Cities, IA
- Area
- Whole counties
Counties Lee County, IA, Hancock County, IL
The radar
The Quad Cities radar (KDVN), 136 km from the middle of the area, began a volume at 13:51 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.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 1.8 hours before the alert went out and 140 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
- 2431 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 176 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 20, 1:53 AM CDT, 6 hours 57 minutes earlier.
Area forecast discussion, May 20, 1:53 AM CDT, 6 hours 57 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 153 AM CDT WED MAY 20 1998 INSTABILITY IN VCNTY OF STATIONARY FNT FM NRN MO INTO CNTRL IL WARRANTS CHC POPS FOR SRN TWO ROWS OF COUNTIES TODAY. WK HI PRES NOSING IN FM DAKOTAS SHOULD KEEP RMNDR OF FA DRY. NO SHORTAGE OF MID AND HIGH LEVEL CLOUDINESS AS STEERING WNDS ADVECT CONVECTIVE DEBRIS EWRD. NE WNDS AT SFC TO SLOWLY CHIP AWAY AT LOW LEVEL MOISTURE THROUGHOUT DAY... PROVIDING RELIEF FM THE STICKY CONDITIONS OF LT... ESP NORTH OF I-80. CID 79/00 DBQ 78/00 MLI 83/10 BRL 81/30 TPH
In the hours before
Special weather statement, May 20, 4:55 AM CDT, 3 hours 55 minutes before
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</html>Special weather statement, May 20, 4:55 AM CDT, 3 hours 55 minutes before
<!doctype html>
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<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.
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<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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</html>The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 11:45 AM CDT | Severe Thunderstorm Warning | DVN | Jefferson, Van Buren | 35 min |
| May 20, 11:51 AM CDT | Severe Thunderstorm Warning | DVN | Keokuk | 34 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1998Severe Thunderstorm Warnings in Illinois, 1998Every severe thunderstorm warning in 1998
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; radar from the NEXRAD Level II archive.