Alert archive / Iowa / Flash Flood Watches in 2020
Flash Flood Watch 6, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood watch at Jun 29, 2020, 3:56 AM CDT for Lee County, Van Buren County, Iowa; Hancock County, McDonough County, Illinois; Clark County, Scotland County, Missouri. It took effect at Jun 29, 2020, 9:05 PM CDT. It was in force for 40 hr.
The area
The counties it named.
The facts
- Issued
- Jun 29, 2020, 3:56 AM CDT (08:56 UTC)
- In effect from
- Jun 29, 2020, 9:05 PM CDT
- Expired
- Jul 1, 2020, 1:00 PM CDT
- In force
- 40 hr
- Issued by
- NWS Quad Cities, IA
- Flood severity
- None
Counties Lee County, IA, Van Buren County, IA, Hancock County, IL, McDonough County, IL, Clark County, MO, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 145 km from the middle of the area, began a volume at 08:55 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, 8.9 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.
- Mixed-layer CAPE
- 601 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 1191 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.7
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 Jun 29, 3:49 AM CDT, 7 minutes earlier.
Area forecast discussion, Jun 29, 3:49 AM CDT, 7 minutes before
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</html>Hazardous weather outlook, Jun 28, 12:51 PM CDT, 15 hours 5 minutes before
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</html>The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 10:35 AM CDT | River Flood Warning | DVN | Des Moines, Louisa | 32 hr |
| Jun 29, 5:35 PM CDT | Special Weather Statement | DVN | Carroll | 25 min |
Nearby
Flash Flood Watches in Iowa, 2020Flash Flood Watches in Illinois, 2020Flash Flood Watches in Missouri, 2020Every 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.