Alert Details

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Alert Information 100.0%* County Coverage

Frost Advisory issued April 18 at 1:56PM EDT until April 19 at 9:00AM EDT by NWS Northern Indiana

Event Type

Frost Advisory

Status

Actual

Severity

Minor

Urgency

Expected

Certainty

Likely

Message Type

Alert

Description

* WHAT...For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Watch, sub-freezing temperatures as low as 25 possible.

* WHERE...Portions of northern Indiana, southwest Michigan, and northwest Ohio.

* WHEN...For the Frost Advisory, from midnight EDT /11 PM CDT/ tonight to 9 AM EDT /8 AM CDT/ Sunday. For the Freeze Watch, from late Sunday night through Monday morning.

* IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Instructions

Take steps now to protect tender plants from the cold.

Affected Areas

Elkhart; Lagrange; Steuben; Noble; De Kalb; Starke; Pulaski; Marshall; Fulton; Whitley; Allen; White; Cass; Miami; Wabash; Huntington; Wells; Adams; Grant; Blackford; Jay; Northern La Porte; Eastern St. Joseph; Northern Kosciusko; Southern La Porte; Western St. Joseph; Southern Kosciusko; Cass; St. Joseph; Branch; Hillsdale; Northern Berrien; Southern Berrien; Williams; Fulton; Defiance; Henry; Paulding; Putnam; Van Wert; Allen

SAME Codes:

018039 Elkhart County, IN

018087 LaGrange County, IN

018151 Steuben County, IN

018113 Noble County, IN

018033 DeKalb County, IN

018149 Starke County, IN

018131 Pulaski County, IN

018099 Marshall County, IN

018049 Fulton County, IN

018183 Whitley County, IN

018003 Allen County, IN

018181 White County, IN

018017 Cass County, IN

018103 Miami County, IN

018169 Wabash County, IN

018069 Huntington County, IN

018179 Wells County, IN

018001 Adams County, IN

018053 Grant County, IN

018009 Blackford County, IN

018075 Jay County, IN

018091 LaPorte County, IN

018141 St. Joseph County, IN

018085 Kosciusko County, IN

026027 Cass County, MI

026149 St. Joseph County, MI

026023 Branch County, MI

026059 Hillsdale County, MI

026021 Berrien County, MI

039171 Williams County, OH

039051 Fulton County, OH

039039 Defiance County, OH

039069 Henry County, OH

039125 Paulding County, OH

039137 Putnam County, OH

039161 Van Wert County, OH

039003 Allen County, OH

UGC: INZ005 INZ006 INZ007 INZ008 INZ009 INZ012 INZ013 INZ014 INZ015 INZ017 INZ018 INZ020 INZ022 INZ023 INZ024 INZ025 INZ026 INZ027 INZ032 INZ033 INZ034 INZ103 INZ104 INZ116 INZ203 INZ204 INZ216 MIZ078 MIZ079 MIZ080 MIZ081 MIZ177 MIZ277 OHZ001 OHZ002 OHZ004 OHZ005 OHZ015 OHZ016 OHZ024 OHZ025

This covers virtually all emergency service districts, townships, and municipalities within the county.

Alert Coverage Map

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Alert Area Affected Boundaries

County-wide coverage shown

Timing

Alert Sent:

2026-04-18 13:56 EDT
01:56 PM EDT

Onset:

2026-04-19T00:00:00-04:00

Expires:

2026-04-19 02:00 EDT
02:00 AM EDT

Event Ends:

2026-04-19T09:00:00-04:00

Added:

2026-04-18 13:57 EDT
01:57 PM EDT

Updated:

2026-04-18 16:06 EDT
04:06 PM EDT

Times in America/New_York. Auto-adjusts for daylight saving.

Technical Details

Alert Identifier
urn:oid:2.49.0.1.840.0.baff3e703fc0ccb14118eadde9849d7f72630011.001.1

Database ID
#488

Scope Public

Category Met

Coverage Type County-Wide

Estimated Coverage 100.0% of Putnam County — approx. 484.2 sq mi Estimated from SAME broadcast area, not the storm polygon.

Source times converted from NWS format to local Eastern Time.

Emergency Service Coverage - All County Boundaries

Major County Impact

This alert covers 100.0% of Putnam County (~484.2 sq mi) , affecting most emergency service boundaries.

Coverage estimated from SAME broadcast area. Recalculate intersections to use the storm polygon.

Coverage by Service Type:

Boundary Analysis Pending

Alert geometry exists (100.0% county coverage), but service boundary intersections have not been calculated yet.

100.0%

Major County Coverage

~484.2 sq mi affected

* Estimated from SAME broadcast area.

NOAA Alert Details

Alert Origin

Originator NWS Northern Indiana

Sender ID w-nws.webmaster@noaa.gov

Scope Public

Category Met

Effective 2026-04-18T13:56:00-04:00

Language en-US

Web http://www.weather.gov

Alert Feed

https://api.weather.gov/alerts/active?zone=OHC063,OHC003,OHZ015,OHC173,OHZ024,OHZ017,OHZ005,OHC125,OHZ025,OHZ016,OHC161,OHC039,OHC069,OHC137,OHZ006,OHZ004

NOAA

EAS Parameters

Block Channels EAS NWEM CMAS

Geocodes

SAME Geocodes

018039 Elkhart County, IN

018087 LaGrange County, IN

018151 Steuben County, IN

018113 Noble County, IN

018033 DeKalb County, IN

018149 Starke County, IN

018131 Pulaski County, IN

018099 Marshall County, IN

018049 Fulton County, IN

018183 Whitley County, IN

018003 Allen County, IN

018181 White County, IN

018017 Cass County, IN

018103 Miami County, IN

018169 Wabash County, IN

018069 Huntington County, IN

018179 Wells County, IN

018001 Adams County, IN

018053 Grant County, IN

018009 Blackford County, IN

018075 Jay County, IN

018091 LaPorte County, IN

018141 St. Joseph County, IN

018085 Kosciusko County, IN

026027 Cass County, MI

026149 St. Joseph County, MI

026023 Branch County, MI

026059 Hillsdale County, MI

026021 Berrien County, MI

039171 Williams County, OH

039051 Fulton County, OH

039039 Defiance County, OH

039069 Henry County, OH

039125 Paulding County, OH

039137 Putnam County, OH

039161 Van Wert County, OH

039003 Allen County, OH

UGC Codes INZ005 INZ006 INZ007 INZ008 INZ009 INZ012 INZ013 INZ014 INZ015 INZ017 INZ018 INZ020 INZ022 INZ023 INZ024 INZ025 INZ026 INZ027 INZ032 INZ033 INZ034 INZ103 INZ104 INZ116 INZ203 INZ204 INZ216 MIZ078 MIZ079 MIZ080 MIZ081 MIZ177 MIZ277 OHZ001 OHZ002 OHZ004 OHZ005 OHZ015 OHZ016 OHZ024 OHZ025

Affected Zones INZ005 INZ006 INZ007 INZ008 INZ009 INZ012 INZ013 INZ014 INZ015 INZ017 INZ018 INZ020 INZ022 INZ023 INZ024 INZ025 INZ026 INZ027 INZ032 INZ033 INZ034 INZ103 INZ104 INZ116 INZ203 INZ204 INZ216 MIZ078 MIZ079 MIZ080 MIZ081 MIZ177 MIZ277 OHZ001 OHZ002 OHZ004 OHZ005 OHZ015 OHZ016 OHZ024 OHZ025

Event Codes

SAME NWS

NationalWeatherService FRY

VTEC

New Event Frost Advisory #1

Office KIWX · Begins 2026-04-19 04:00 UTC · Ends 2026-04-19 13:00 UTC

/O.NEW.KIWX.FR.Y.0001.260419T0400Z-260419T1300Z/

IEM VTEC Browser

FROST ADVISORY IN EFFECT FROM MIDNIGHT EDT /11 PM CDT/ TONIGHT TO 9 AM EDT /8 AM CDT/ SUNDAY... ...FREEZE WATCH IN EFFECT FROM LATE SUNDAY NIGHT THROUGH MONDAY MORNING

NWS Parameters

AWIPSidentifier NPWIWX

WMOidentifier WWUS73 KIWX 181756

eventEndingTime 2026-04-19T09:00:00-04:00

EAS Forwarding Status

Not Forwarded

Reason No authorised SAME event code available for Frost Advisory.

Actions

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Raw CAP Alert Data

Original JSON data received from NOAA National Weather Service

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      "https://api.weather.gov/zones/forecast/INZ023",
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      "https://api.weather.gov/zones/forecast/INZ204",
      "https://api.weather.gov/zones/forecast/INZ216",
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      "https://api.weather.gov/zones/forecast/MIZ080",
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      "https://api.weather.gov/zones/forecast/OHZ015",
      "https://api.weather.gov/zones/forecast/OHZ016",
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    "category": "Met",
    "certainty": "Likely",
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        "018149",
        "018131",
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        "018049",
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        "018181",
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        "018179",
        "018001",
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        "018009",
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        "018141",
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        "MIZ177",
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        "OHZ002",
        "OHZ004",
        "OHZ005",
        "OHZ015",
        "OHZ016",
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        "OHZ025"
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    "language": "en-US",
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Source: NOAA
Origin URI: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.baff3e703fc0ccb14118eadde9849d7f72630011.001.1
Last Updated: 2026-04-18 16:06 EDT (20:06 UTC)

Alert Details

MAJOR COUNTY COVERAGE ALERT

Alert Information 100.0%* County Coverage

Frost Advisory issued April 18 at 1:56PM EDT until April 19 at 9:00AM EDT by NWS Northern Indiana

Event Type

Status

Severity

Urgency

Certainty

Message Type

Description

Instructions

Affected Areas

Alert Coverage Map

Timing

Technical Details

Emergency Service Coverage - All County Boundaries

Major County Impact

Boundary Analysis Pending

NOAA Alert Details

Alert Origin

EAS Parameters

Geocodes

Event Codes

VTEC

NWS Parameters

EAS Forwarding Status

Actions

Debug Information

Raw CAP Alert Data