Alert archive / Indiana / Frost Advisories in 2023

Frost Advisory 1, NWS Northern Indiana

April 18, 202319 counties in Indiana; Allen County, Van Wert County, Ohio

NWS Northern Indiana issued this frost advisory at Apr 18, 2023, 1:35 PM EDT for 19 counties in Indiana; Allen County, Van Wert County, Ohio. It took effect at Apr 19, 2023, 12:00 AM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Apr 18, 2023, 1:35 PM EDT (17:35 UTC)
In effect from
Apr 19, 2023, 12:00 AM EDT
Expired
Apr 19, 2023, 8:00 AM EDT
In force
8 hr
Issued by
NWS Northern Indiana
All 21 counties

Adams County, IN, Allen County, IN, Blackford County, IN, Cass County, IN, Fulton County, IN, Grant County, IN, Huntington County, IN, Jay County, IN, Kosciusko County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN, Allen County, OH, Van Wert County, OH

The radar

The Northern Indiana radar (KIWX), 46 km from the middle of the area, began a volume at 17:38 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, 5.6 hours before the alert went out and 236 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 2023-04-18Temperature 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 2023-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
1091 m above ground
0-6 km bulk shear
79 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
217 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 18, 1:35 PM EDTFreeze WarningIWXDeKalb, Elkhart, LaGrange, Noble, Steuben18 hr

Nearby

Frost Advisories in Indiana, 2023Frost Advisories in Ohio, 2023Every frost advisory in 2023

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.