Alert archive / Iowa / Dense Fog Advisories in 2021

Dense Fog Advisory 8, NWS Quad Cities, IA

March 16, 20218 counties in Iowa; 5 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this dense fog advisory at Mar 16, 2021, 12:37 AM CDT for 8 counties in Iowa; 5 counties in Illinois; Clark County, Scotland County, Missouri. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Mar 16, 2021, 12:37 AM CDT (05:37 UTC)
Expired: Mar 16, 2021, 10:00 AM CDT
In force: 9 hr
Issued by: NWS Quad Cities, IA

Counties Des Moines County, IA, Henry County, IA, Jefferson County, IA, Keokuk County, IA, Lee County, IA, Louisa County, IA, Van Buren County, IA, Washington County, IA, Hancock County, IL, Henderson County, IL, McDonough County, IL, Mercer County, IL, Warren County, IL, Clark County, MO, Scotland County, MO

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 5.6 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 518 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 164 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 dense fog advisory 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 dense fog advisory went out at Mar 16, 12:17 AM CDT, 20 minutes earlier.

Area forecast discussion, Mar 16, 12:17 AM CDT, 20 minutes before

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Hazardous weather outlook, Mar 15, 3:16 PM CDT, 9 hours 21 minutes before

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In the hours before

Local storm report, Mar 15, 7:26 PM CDT, 5 hours 11 minutes before

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Local storm report, Mar 15, 7:54 PM CDT, 4 hours 43 minutes before

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Local storm report, Mar 15, 7:55 PM CDT, 4 hours 42 minutes before

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Local storm report, Mar 15, 9:23 PM CDT, 3 hours 14 minutes before

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Local storm report, Mar 15, 9:24 PM CDT, 3 hours 13 minutes before

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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Mar 15, 9:30 PM CDT, 3 hours 7 minutes before

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      <p id="message1">
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      <p id="message2">
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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
Mar 16, 11:39 AM CDT	River Flood Watch	DVN	Johnson, Washington	22 hr
Mar 16, 11:39 AM CDT	River Flood Watch	DVN	Keokuk	6 days
Mar 16, 11:39 AM CDT	River Flood Watch	DVN	Des Moines, Henry, Lee	5 days
Mar 16, 11:39 AM CDT	River Flood Watch	DVN	Hancock, McDonough	27 hr

Nearby

Dense Fog Advisories in Iowa, 2021 Dense Fog Advisories in Illinois, 2021 Dense Fog Advisories in Missouri, 2021 Every dense fog advisory in 2021

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.