Alert archive / Iowa / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 62, NWS Quad Cities, IA

May 26, 2020Delaware County, Dubuque County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at May 26, 2020, 2:17 PM CDT for Delaware County, Dubuque County, Iowa. It was in force for 13 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 26, 2020, 2:17 PM CDT (19:17 UTC)
Expired: May 26, 2020, 2:30 PM CDT
In force: 13 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Delaware County, IA, Dubuque County, IA

The radar

The Quad Cities radar (KDVN), 105 km from the middle of the area, began a volume at 19:21 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, 7.3 hours before the alert went out and 108 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: 332 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 1121 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 26, 12:38 PM CDT, 1 hour 39 minutes earlier.

Area forecast discussion, May 26, 12:38 PM CDT, 1 hour 39 minutes before

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Hazardous weather outlook, May 26, 8:15 AM CDT, 6 hours 2 minutes before

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
815 AM CDT Tue May 26 2020

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-271315-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
815 AM CDT Tue May 26 2020

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast
Missouri.

.DAY ONE...TODAY AND TONIGHT

Scattered thunderstorms are expected this afternoon and evening.
A few storms could produce damaging winds, and isolated tornadoes.
All storms will also be capable of producing heavy rainfall,
which could lead to localized flash flooding.

The Rock River is experiencing flooding. Please see the latest
Flood Statements and Flood Warnings for details.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

Rounds of showers and scattered thunderstorms are expected
Wednesday through Thursday ahead of a slow moving front.
The primary threat will be heavy rain, which could cause
localized flooding.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed this afternoon and evening.

In the hours before

Local storm report, May 26, 10:55 AM CDT, 3 hours 22 minutes before

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Special weather statement, May 26, 12:49 PM CDT, 1 hour 28 minutes before

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Special weather statement, May 26, 1:38 PM CDT, 39 minutes before

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Local storm report, May 26, 1:40 PM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
140 PM CDT TUE MAY 26 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0125 PM     TSTM WND GST     3 WSW COPPOCK           41.15N 91.77W
05/26/2020  E55 MPH          JEFFERSON          IA   TRAINED SPOTTER

            FENCE DOWN WITH TIN OFF AN OUTBUILDING ROOF.

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 7:18 PM CDT	Special Weather Statement	DVN	Muscatine	27 min
May 25, 7:46 PM CDT	Special Weather Statement	DVN	Keokuk	44 min
May 25, 8:33 PM CDT	Special Weather Statement	DVN	Johnson	27 min
May 25, 8:35 PM CDT	Special Weather Statement	DVN	Linn	25 min
May 25, 8:58 PM CDT	Special Weather Statement	DVN	Linn	32 min
May 25, 9:37 PM CDT	Special Weather Statement	DVN	Buchanan	38 min
May 26, 12:49 PM CDT	Special Weather Statement	DVN	Benton	26 min
May 26, 1:38 PM CDT	Special Weather Statement	DVN	Des Moines, Iowa, Louisa, Washington	22 min
May 26, 1:44 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Keokuk, Washington	31 min
May 26, 2:01 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Johnson	32 min
May 26, 2:53 PM CDT	Special Weather Statement	DVN	Johnson	37 min
May 26, 3:03 PM CDT	Special Weather Statement	DVN	Lee	27 min
May 26, 3:17 PM CDT	Special Weather Statement	DVN	Muscatine	28 min
May 26, 3:37 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Muscatine	38 min
May 26, 4:06 PM CDT	Special Weather Statement	DVN	Jones	24 min
May 26, 4:35 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson	25 min
May 26, 4:41 PM CDT	Special Weather Statement	DVN	Delaware	34 min
May 26, 4:54 PM CDT	Special Weather Statement	DVN	Linn	36 min
May 26, 5:41 PM CDT	Special Weather Statement	DVN	Muscatine	34 min
May 26, 6:55 PM CDT	Special Weather Statement	DVN	Dubuque	35 min
May 25, 8:26 PM CDT	Special Weather Statement	DVN	Henry	34 min
May 25, 9:21 PM CDT	Special Weather Statement	DVN	Putnam	24 min
May 26, 2:44 PM CDT	Special Weather Statement	DVN	Rock Island	31 min
May 26, 5:23 PM CDT	Special Weather Statement	DVN	Whiteside	37 min
May 26, 5:39 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Whiteside	36 min
May 26, 6:03 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson	27 min
May 26, 6:27 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	33 min
May 26, 6:41 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	19 min
May 26, 6:42 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	18 min
May 25, 8:39 PM CDT	Special Weather Statement	DVN	Scotland	51 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2020 Every severe thunderstorm warning in 2020

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.