Alert archive / Iowa / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 33, NWS Quad Cities, IA

June 4, 1999Benton County, Linn County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jun 4, 1999, 11:57 AM CDT for Benton County, Linn County, Iowa. It was in force for 63 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
Jun 4, 1999, 11:57 AM CDT (16:57 UTC)
Expired
Jun 4, 1999, 1:00 PM CDT
In force
63 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

Counties Benton County, IA, Linn County, IA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 4, 10:00 AM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 5.0 hours before the alert went out and 122 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-pSkew-T log-p diagram, Davenport, at 12:00Z on 1999-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 1999-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 183 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1356 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
183 m²/s²
0-3 km storm-relative helicity
187 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 Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 4, 3:00 AM CDT, 8 hours 57 minutes earlier.

Area forecast discussion, Jun 4, 3:00 AM CDT, 8 hours 57 minutes before
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In the hours before

Local storm report, Jun 4, 8:58 AM CDT, 2 hours 59 minutes before
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Local storm report, Jun 4, 8:58 AM CDT, 2 hours 59 minutes before
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<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.
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        Please try again in a few minutes.
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Special weather statement, Jun 4, 10:22 AM CDT, 1 hour 35 minutes before
IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-009-
015>018-024>026-034-035-051000-

SIGNIFICANT WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1022 AM CDT FRI JUN 4 1999

...SEVERE THUNDERSTORM WATCH 374 PREVIOUSLY IN EFFECT UNTIL 10 AM CDT
ALLOWED TO EXPIRE...
...SEVERE THUNDERSTORM WATCH 375 NOW IN EFFECT FOR MUCH OF EAST-CENTRAL
IOWA UNTIL 300 PM CDT...

SEVERE THUNDERSTORM WATCH 374 HAS BEEN ALLOWED TO EXPIRE FOR BUCHANAN
COUNTY. HOWEVER...SEVERE THUNDERSTORM WATCH 375 IS NOW IN EFFECT
UNTIL 300 PM CDT FOR MUCH OF EAST-CENTRAL IOWA INCLUDING THE
FOLLOWING COUNTIES...BENTON...LINN...JONES...IOWA...JOHNSON...CEDAR...
KEOKUK...WASHINGTON...LOUISA...MUSCATINE...JEFFERSON...HENRY...
DES MOINES...VAN BUREN AND LEE.

THUNDERSTORMS WHICH ROLLED ACROSS NORTHERN IOWA OVERNIGHT AND THIS
MORNING WERE EXITING INTO ILLINOIS. ANOTHER CLUSTER OF STRONG TO
SEVERE THUNDERSTORMS WAS ORGANIZING OVER WEST-CENTRAL IOWA. THESE
THUNDERSTORMS WILL LIKELY MOVE INTO PORTIONS OF EAST-CENTRAL IOWA
THIS AFTERNOON. DAMAGING STRAIGHT LINE WINDS IN EXCESS OF 70 MPH AND
LARGE HAIL WILL BE THE MAIN THREAT WITH AN ISOLATED TORNADO POSSIBLE.

EMERGENCY MANAGERS AND STORM SPOTTER GROUPS WITHIN THE WATCH AREA ARE
ENCOURAGED TO ACTIVATE AS SOON AS POSSIBLE.

ANY REPORTS TO THE NATIONAL WEATHER SERVICE WOULD BE GREATLY
APPRECIATED.

05
Special weather statement, Jun 4, 10:22 AM CDT, 1 hour 35 minutes before
IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-009-
015>018-024>026-034-035-051000-

SIGNIFICANT WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1022 AM CDT FRI JUN 4 1999

...SEVERE THUNDERSTORM WATCH 374 PREVIOUSLY IN EFFECT UNTIL 10 AM CDT
ALLOWED TO EXPIRE...
...SEVERE THUNDERSTORM WATCH 375 NOW IN EFFECT FOR MUCH OF EAST-CENTRAL
IOWA UNTIL 300 PM CDT...

SEVERE THUNDERSTORM WATCH 374 HAS BEEN ALLOWED TO EXPIRE FOR BUCHANAN
COUNTY. HOWEVER...SEVERE THUNDERSTORM WATCH 375 IS NOW IN EFFECT
UNTIL 300 PM CDT FOR MUCH OF EAST-CENTRAL IOWA INCLUDING THE
FOLLOWING COUNTIES...BENTON...LINN...JONES...IOWA...JOHNSON...CEDAR...
KEOKUK...WASHINGTON...LOUISA...MUSCATINE...JEFFERSON...HENRY...
DES MOINES...VAN BUREN AND LEE.

THUNDERSTORMS WHICH ROLLED ACROSS NORTHERN IOWA OVERNIGHT AND THIS
MORNING WERE EXITING INTO ILLINOIS. ANOTHER CLUSTER OF STRONG TO
SEVERE THUNDERSTORMS WAS ORGANIZING OVER WEST-CENTRAL IOWA. THESE
THUNDERSTORMS WILL LIKELY MOVE INTO PORTIONS OF EAST-CENTRAL IOWA
THIS AFTERNOON. DAMAGING STRAIGHT LINE WINDS IN EXCESS OF 70 MPH AND
LARGE HAIL WILL BE THE MAIN THREAT WITH AN ISOLATED TORNADO POSSIBLE.

EMERGENCY MANAGERS AND STORM SPOTTER GROUPS WITHIN THE WATCH AREA ARE
ENCOURAGED TO ACTIVATE AS SOON AS POSSIBLE.

ANY REPORTS TO THE NATIONAL WEATHER SERVICE WOULD BE GREATLY
APPRECIATED.

05

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 4, 2:11 PM CDTSevere Thunderstorm WarningDVNMuscatine64 min
Jun 4, 2:11 PM CDTSevere Thunderstorm WarningDVNScott64 min
Jun 4, 2:27 PM CDTSevere Thunderstorm WarningDVNVan Buren48 min
Jun 4, 2:45 PM CDTSevere Thunderstorm WarningDVNHenry50 min
Jun 4, 3:07 PM CDTTornado WarningDVNHenry33 min
Jun 4, 3:12 PM CDTSevere Thunderstorm WarningDVNHenderson, McDonough, Warren48 min
Jun 4, 3:26 PM CDTSevere Thunderstorm WarningDVNHancock49 min
Jun 4, 3:30 PM CDTSevere Thunderstorm WarningDVNBureau, Putnam65 min
Jun 4, 3:52 PM CDTTornado WarningDVNMcDonough33 min
Jun 4, 4:23 PM CDTTornado WarningDVNPutnam32 min

Nearby

Severe Thunderstorm Warnings in Iowa, 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; the sounding from the Mesonet's radiosonde archive.