Alert archive / Iowa / Flash Flood Watches in 2020

Flash Flood Watch 1, NWS Quad Cities, IA

May 14, 202015 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this flash flood watch at May 14, 2020, 11:38 AM CDT for 15 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at May 14, 2020, 4:00 PM CDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: May 14, 2020, 11:38 AM CDT (16:38 UTC)
In effect from: May 14, 2020, 4:00 PM CDT
Expired: May 15, 2020, 6:30 AM CDT
In force: 15 hr
Issued by: NWS Quad Cities, IA
Flood severity: None

All 30 counties

Cedar County, IA, Clinton County, IA, Des Moines County, IA, Henry County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee 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), 42 km from the middle of the area, began a volume at 16:39 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, 4.6 hours before the alert went out and 48 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: 21 J/kg
Mixed-layer CIN: -218 J/kg
Mixed-layer LCL: 472 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 375 m²/s²
0-3 km storm-relative helicity: 374 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 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 14, 11:05 AM CDT, 33 minutes earlier.

Area forecast discussion, May 14, 11:05 AM CDT, 33 minutes before

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Hazardous weather outlook, May 14, 3:45 AM CDT, 7 hours 53 minutes before

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In the hours before

Local storm report, May 14, 5:55 AM CDT, 5 hours 43 minutes before

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Special weather statement, May 14, 6:55 AM CDT, 4 hours 43 minutes before

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Local storm report, May 14, 8:07 AM CDT, 3 hours 31 minutes before

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Local storm report, May 14, 8:59 AM CDT, 2 hours 39 minutes before

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Local storm report, May 14, 11:04 AM CDT, 34 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 13, 7:59 PM CDT	Special Weather Statement	DVN	Clinton	46 min
May 14, 6:33 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Keokuk	57 min
May 14, 2:31 PM CDT	River Flood Watch	DVN	Henry, Rock Island, Whiteside	5 days
May 14, 2:31 PM CDT	River Flood Watch	DVN	Henry, Rock Island	6 days

Nearby

Flash Flood Watches in Iowa, 2020 Flash Flood Watches in Illinois, 2020 Flash Flood Watches in Missouri, 2020 Every flash flood watch 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.