Alert archive / Indiana / Frost Advisories in 2020

Frost Advisory 1, NWS Northern Indiana

April 21, 20208 counties in Indiana

NWS Northern Indiana issued this frost advisory at Apr 21, 2020, 3:17 PM EDT for 8 counties in Indiana. It took effect at Apr 22, 2020, 1:00 AM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Apr 21, 2020, 3:17 PM EDT (19:17 UTC)
In effect from
Apr 22, 2020, 1:00 AM EDT
Expired
Apr 22, 2020, 8:00 AM EDT
In force
7 hr
Issued by
NWS Northern Indiana

Counties Blackford County, IN, Cass County, IN, Fulton County, IN, Grant County, IN, Jay County, IN, Miami County, IN, Pulaski County, IN, White County, IN

The radar

The Northern Indiana radar (KIWX), 76 km from the middle of the area, began a volume at 19:16 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 7.3 hours before the alert went out and 238 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 12:00Z on 2020-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 12:00Z on 2020-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
1288 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Northern Indiana issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 20, 8:54 PM EDTSpecial Marine WarningIWX110 min
Apr 20, 9:58 PM EDTSpecial Weather StatementIWXLaPorte, Saint Joseph62 min
Apr 20, 11:09 PM EDTSpecial Weather StatementIWXElkhart, LaGrange, Marshall, Starke36 min
Apr 20, 11:45 PM EDTSpecial Weather StatementIWXAllen, DeKalb, Fulton, Huntington, Kosciusko, Noble and 2 more60 min
Apr 21, 3:17 PM EDTFreeze WarningIWXAdams, Huntington, Wabash, Wells17 hr
Apr 20, 11:03 PM EDTSpecial Weather StatementIWXBerrien27 min

Nearby

Frost Advisories in Indiana, 2020Every frost advisory 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.