Alert archive / Iowa / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 116, NWS Quad Cities, IA

August 3, 1997Scott County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 3, 1997, 4:47 PM CDT for Scott County, Iowa. It was in force for 48 min. 2 reports 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 3, 1997, 4:47 PM CDT (21:47 UTC)
Expired
Aug 3, 1997, 5:35 PM CDT
In force
48 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Scott County, IA

The radar

The Quad Cities radar (KDVN), 4 km from the middle of the area, began a volume at 21:50 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

TimeReportWhereRemark
Aug 3, 4:50 PM CDTHail 0.75Parkview, IA
Aug 3, 5:00 PM CDTHail 0.75Davenport, IA

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.

IssuedProductOfficeLasted
Aug 3, 2:15 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.8 hours before the alert went out and 10 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 1997-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 joules per kilogram.LCLLFCEL10008507005003002001001 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 1997-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 square meters per square second.19395878Sfc1 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
13 J/kg
Mixed-layer CIN
-260 J/kg
Mixed-layer LCL
1867 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
22 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 Aug 3, 1:04 PM CDT, 3 hours 43 minutes earlier.

Area forecast discussion, Aug 3, 1:04 PM CDT, 3 hours 43 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1240 PM CDT SUN AUG 3 1997

EARLY AFTERNOON SATELLITE IMAGERY ALONG SURFACE OBSERVATIONS INDICATED
CU FIELDS STARTING TO POP ACROSS AREA IN CONJUCTION WITH OUTFLOW BOUNDARY
ACROSS CENTRAL IOWA...PER 17Z SURFACE ANALYSIS. 5H PROFILER PLANVIEW
DEPICTED 40-50 KT SPEED MAX NOSING INTO REGION WHERE VERY UNSTABLE
AIRMASS IS CURRENTLY IN PLACE.

APPROACH OF MID-LEVEL SPEED AND 5H SHORTWAVE TROUGH SHOULD BE ENOUGH TO
BREAK CAP BY MID-LATE AFTERNOON. ACTIVITY SHOULD ARRIVE FIRST IN NORTHERN
COUNTIES THEN PROPOGATE SOUTH AND EAST REACHING SOUTHERN MOST COUNTIES
BY LATER THIS EVENING. SUGGEST SCATTERED TSRA THIS EVENING FOR COUNTIES
A.LONG AND NORTH OF I-80 WITH HIGH CHANCE POPS ELSEWHERE. REFRESHING
RELIEF IN STORE FOR REGION IN WAKE OF FRONT.

CID 65/50 EVE   DBQ 63/50 EVE     MLI 67/50       BRL 68/50

BERG

In the hours before

Local storm report, Aug 3, 4:26 PM CDT, 21 minutes before
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Local storm report, Aug 3, 4:27 PM CDT, 20 minutes before
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Local storm report, Aug 3, 4:31 PM CDT, 16 minutes before
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Local storm report, Aug 3, 4:41 PM CDT, 6 minutes before
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Local storm report, Aug 3, 4:46 PM CDT, 1 minute before
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Local storm report, Aug 3, 4:46 PM CDT, 1 minute before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 2:02 PM CDTSevere Thunderstorm WarningDVNJones63 min
Aug 3, 2:30 PM CDTSevere Thunderstorm WarningDVNClinton65 min
Aug 3, 2:50 PM CDTSevere Thunderstorm WarningDVNCedar50 min
Aug 3, 2:53 PM CDTSevere Thunderstorm WarningDVNDubuque62 min
Aug 3, 2:58 PM CDTTornado WarningDVNClinton47 min
Aug 3, 3:20 PM CDTSevere Thunderstorm WarningDVNBenton65 min
Aug 3, 3:38 PM CDTSevere Thunderstorm WarningDVNScott47 min
Aug 3, 3:51 PM CDTTornado WarningDVNScott49 min
Aug 3, 3:47 PM CDTSevere Thunderstorm WarningDVNRock Island63 min
Aug 3, 4:01 PM CDTSevere Thunderstorm WarningDVNHenry64 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1997Every severe thunderstorm warning in 1997

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.