Alert archive / Indiana / Winter Weather Advisories in 2018

Winter Weather Advisory 2, NWS Indianapolis, IN

January 11, 201828 counties in Indiana

NWS Indianapolis, IN issued this winter weather advisory at Jan 11, 2018, 2:53 PM EST for 28 counties in Indiana. It took effect at Jan 12, 2018, 1:00 AM EST. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Jan 11, 2018, 2:53 PM EST (19:53 UTC)
In effect from: Jan 12, 2018, 1:00 AM EST
Expired: Jan 12, 2018, 10:00 PM EST
In force: 21 hr
Issued by: NWS Indianapolis, IN

All 28 counties

Boone County, IN, Carroll County, IN, Clay County, IN, Clinton County, IN, Delaware County, IN, Fountain County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Johnson County, IN, Madison County, IN, Marion County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN

The radar

The Indianapolis radar (KIND), 25 km from the middle of the area, began a volume at 19:55 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 12:00Z, 7.9 hours before the alert went out and 187 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: 12 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 489 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 342 m²/s²
0-3 km storm-relative helicity: 299 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 winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Indianapolis, IN wrote its last area forecast discussion before this winter weather advisory went out at Jan 11, 2:46 PM EST, 7 minutes earlier.

Area forecast discussion, Jan 11, 2:46 PM EST, 7 minutes before

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Hazardous weather outlook, Jan 11, 4:12 AM EST, 10 hours 41 minutes before

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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
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        Please try again in a few minutes.
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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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The office that day

Everything else NWS Indianapolis, IN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 11, 2:53 PM EST	Winter Storm Warning	IND	Bartholomew, Brown, Daviess, Decatur, Greene, Jackson and 5 more	31 hr

Nearby

Winter Weather Advisories in Indiana, 2018 Every winter weather advisory in 2018

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.