Alert archive / Iowa / Flash Flood Watches in 2019

Flash Flood Watch 8, NWS Quad Cities, IA

May 28, 201921 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this flash flood watch at May 28, 2019, 3:45 AM CDT for 21 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri. It was in force for 25 hr.

The area

The counties it named.

The facts

Issued: May 28, 2019, 3:45 AM CDT (08:45 UTC)
Expired: May 29, 2019, 4:16 AM CDT
In force: 25 hr
Issued by: NWS Quad Cities, IA
Flood severity: None

All 36 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, McDonough County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 41 km from the middle of the area, began a volume at 08:45 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

Lincoln, IL (KILX), launched 00:00Z, 8.8 hours before the alert went out and 251 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: 414 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1544 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at May 28, 3:39 AM CDT, 6 minutes earlier.

Area forecast discussion, May 28, 3:39 AM CDT, 6 minutes before

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Hazardous weather outlook, May 27, 9:12 PM CDT, 6 hours 33 minutes before

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In the hours before

Special weather statement, May 27, 10:37 PM CDT, 5 hours 8 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 28, 10:26 AM CDT	Special Weather Statement	DVN	Cedar, Clinton, Jackson, Muscatine, Scott	49 min
May 28, 11:07 AM CDT	Special Weather Statement	DVN	Jefferson	38 min
May 28, 12:07 PM CDT	Flash Flood Warning	DVN	Scott	3 hr
May 28, 12:12 PM CDT	Special Weather Statement	DVN	Des Moines, Van Buren	48 min
May 28, 2:54 PM CDT	River Flood Warning	DVN	Cedar, Johnson	67 hr
May 28, 2:54 PM CDT	River Flood Warning	DVN	Louisa	4 days
May 28, 4:27 PM CDT	Special Weather Statement	DVN	Jefferson, Van Buren	48 min
May 28, 4:32 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	58 min
May 28, 5:05 PM CDT	Special Weather Statement	DVN	Johnson, Linn	55 min
May 28, 5:10 PM CDT	Flash Flood Warning	DVN	Henry, Jefferson, Keokuk, Van Buren, Washington	8 hr
May 28, 5:59 PM CDT	Special Weather Statement	DVN	Des Moines, Louisa, Muscatine, Scott	61 min
May 28, 6:02 PM CDT	Flash Flood Warning	DVN	Des Moines, Louisa	8 hr
May 28, 6:09 PM CDT	Flash Flood Warning	DVN	Muscatine, Scott	8 hr
May 28, 6:24 PM CDT	Special Weather Statement	DVN	Henry, Van Buren	51 min
May 28, 6:38 PM CDT	Flash Flood Warning	DVN	Cedar, Iowa, Johnson	8 hr
May 28, 6:40 PM CDT	Special Weather Statement	DVN	Des Moines, Henry, Lee, Louisa	50 min
May 28, 6:53 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Lee, Louisa	67 min
May 28, 2:08 PM CDT	River Flood Warning	DVN	Henry	5 days
May 27, 7:45 PM CDT	River Flood Warning	DVN	Clark	4 days
May 27, 10:37 PM CDT	Special Weather Statement	DVN	Scotland	53 min

Nearby

Flash Flood Watches in Iowa, 2019 Flash Flood Watches in Illinois, 2019 Flash Flood Watches in Missouri, 2019 Every flash flood watch 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.