Alert archive / Iowa / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 35, NWS Quad Cities, IA

May 17, 20195 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at May 17, 2019, 6:41 AM CDT for 5 counties in Iowa. It was in force for 49 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 17, 2019, 6:41 AM CDT (11:41 UTC)
Expired: May 17, 2019, 7:30 AM CDT
In force: 49 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Henry County, IA, Jefferson County, IA, Keokuk County, IA, Louisa County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 107 km from the middle of the area, began a volume at 11:43 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 00:00Z, 11.7 hours before the alert went out and 114 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: 2335 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1972 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.8

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 17, 3:29 AM CDT, 3 hours 12 minutes earlier.

Area forecast discussion, May 17, 3:29 AM CDT, 3 hours 12 minutes before

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Hazardous weather outlook, May 17, 4:21 AM CDT, 2 hours 20 minutes before

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In the hours before

Local storm report, May 17, 4:09 AM CDT, 2 hours 32 minutes before

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Special weather statement, May 17, 5:31 AM CDT, 1 hour 10 minutes before

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Special weather statement, May 17, 6:08 AM CDT, 33 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 7:15 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Scott	45 min
May 16, 8:00 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa	60 min
May 16, 8:27 PM CDT	Severe Thunderstorm Warning	DVN	Iowa	63 min
May 16, 8:48 PM CDT	Severe Thunderstorm Warning	DVN	Clinton	57 min
May 16, 8:57 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Johnson, Linn	48 min
May 16, 9:03 PM CDT	Flash Flood Warning	DVN	Iowa	5 hr
May 16, 9:06 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Iowa, Johnson, Muscatine, Washington	39 min
May 16, 9:23 PM CDT	Severe Thunderstorm Warning	DVN	Scott	52 min
May 16, 9:44 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Louisa, Muscatine, Scott, Washington	46 min
May 16, 9:55 PM CDT	Flash Flood Warning	DVN	Cedar, Johnson, Muscatine, Washington	4 hr
May 16, 10:04 PM CDT	Special Weather Statement	DVN	Louisa, Washington	41 min
May 16, 10:10 PM CDT	Severe Thunderstorm Warning	DVN	Muscatine, Scott	50 min
May 16, 10:35 PM CDT	Special Weather Statement	DVN	Des Moines, Henry	25 min
May 16, 11:06 PM CDT	Special Weather Statement	DVN	Iowa	39 min
May 16, 11:27 PM CDT	Special Weather Statement	DVN	Jefferson	48 min
May 17, 5:31 AM CDT	Special Weather Statement	DVN	Jefferson, Keokuk, Washington	44 min
May 17, 6:08 AM CDT	Special Weather Statement	DVN	Keokuk, Washington	52 min
May 17, 7:12 AM CDT	Special Weather Statement	DVN	Des Moines, Henry	48 min
May 17, 7:27 AM CDT	Special Weather Statement	DVN	Louisa	33 min
May 17, 7:56 AM CDT	Special Weather Statement	DVN	Des Moines	64 min
May 17, 8:28 AM CDT	River Flood Warning	DVN	Benton, Iowa	21 days
May 17, 8:38 AM CDT	River Flood Warning	DVN	Keokuk	16 days
May 17, 11:00 AM CDT	River Flood Warning	DVN	Scott	4 days
May 16, 7:34 PM CDT	Severe Thunderstorm Warning	DVN	Rock Island, Whiteside	41 min
May 16, 8:27 PM CDT	Special Weather Statement	DVN	Whiteside	48 min
May 16, 9:10 PM CDT	Severe Thunderstorm Warning	DVN	Whiteside	50 min
May 16, 9:54 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry, Whiteside	51 min
May 16, 10:47 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry, Mercer	58 min
May 16, 10:52 PM CDT	Severe Thunderstorm Warning	DVN	Bureau	23 min
May 17, 8:12 AM CDT	Severe Thunderstorm Warning	DVN	Henderson, Mercer, Warren	48 min
May 17, 8:41 AM CDT	Special Weather Statement	DVN	Henry	34 min
May 17, 9:35 AM CDT	River Flood Warning	DVN	Henry, Rock Island, Whiteside	3 days
May 17, 9:58 AM CDT	Special Weather Statement	DVN	Bureau, Putnam	47 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2019 Every severe thunderstorm warning in 2019

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.