Illinois, 2021

Frost and Freeze in Illinois, April 1 to 3, 2021

April 1 to 3, 2021 · NWS PAH · 19 events in 19 counties and zones

Three consecutive nights of frost or freezing temperatures were observed from the 1st to the 3rd. Vegetation was vulnerable to frost and freezing temperatures due to abnormally warm temperatures in March that promoted early growth.

Where it happened

Every event with a place to put it; 19 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
19

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS PAH wrote it up.

Three consecutive nights of frost or freezing temperatures were observed from the 1st to the 3rd. Vegetation was vulnerable to frost and freezing temperatures due to abnormally warm temperatures in March that promoted early growth. The coldest temperatures were on the morning of the 2nd, when lows ranged from 21 to 24 degrees. The exception was around Cairo, where lows were in the upper 20's. Minor to moderate crop damage was reported after a full assessment was conducted. Alfalfa and wheat sustained light damage in many areas. More than half the peach and apple crop sustained no damage, however a significant percentage of both crops were damaged to varying degrees, ranging from light to severe. Protected strawberries were undamaged, and the overall condition of the crop was rated as good in early May. An unseasonably strong high pressure system with a central pressure around 1035 mb moved southeast from Canada across the lower Ohio Valley on the morning of the 2nd.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Paducah, KY wrote its last area forecast discussion before the first event at Apr 1, 1:38 AM CST, 22 minutes earlier.

Area forecast discussion, Apr 1, 1:38 AM CST, 22 minutes before
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Hazardous weather outlook, Mar 31, 11:24 AM CST, 14 hours 36 minutes before
Hazardous Weather Outlook
National Weather Service Paducah KY
1224 PM CDT Wed Mar 31 2021

ILZ075>078-080>094-INZ081-082-085>088-KYZ001>022-MOZ076-086-087-
100-107>112-114-011000-
Jefferson-Wayne IL-Edwards-Wabash-Perry IL-Franklin-Hamilton-
White-Jackson-Williamson-Saline-Gallatin-Union-Johnson-Pope-
Hardin-Alexander-Pulaski-Massac-Gibson-Pike-Posey-Vanderburgh-
Warrick-Spencer-Fulton-Hickman-Carlisle-Ballard-McCracken-Graves-
Livingston-Marshall-Calloway-Crittenden-Lyon-Trigg-Caldwell-
Union KY-Webster-Hopkins-Christian-Henderson-Daviess-McLean-
Muhlenberg-Todd-Perry MO-Bollinger-Cape Girardeau-Wayne MO-Carter-
Ripley-Butler-Stoddard-Scott-Mississippi-New Madrid-
1224 PM CDT Wed Mar 31 2021

This Hazardous Weather Outlook is for portions of southern
Illinois, southwest Indiana, western Kentucky, and southeast
Missouri.

.DAY ONE...This Afternoon and Tonight

A hard freeze will occur late tonight. Refer to the Freeze
Warning for details.

An elevated fire danger will persist across southeast Missouri
including the Mark Twain National Forest area through sunset.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

A hard freeze will occur again late Thursday night into Friday
morning. Refer to the Freeze Warning for details.

Sustained southerly winds of 15 mph with occasional gusts of 20
to 25 mph may generate choppy waters on area lakes and rivers this
Saturday. Boaters should exercise caution on area waterways.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

19 frost/freeze. Local standard time, as filed.

Frost/Freeze, Alexander

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Alexander forecast zone
Reported by
AWOS
Coordinates
37.192, -89.338 (the zone’s center; the record gives no point)

Frost/Freeze, Edwards

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Edwards forecast zone
Reported by
AWOS
Coordinates
38.417, -88.053 (the zone’s center; the record gives no point)

Frost/Freeze, Franklin

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Franklin forecast zone
Reported by
AWOS
Coordinates
37.992, -88.924 (the zone’s center; the record gives no point)

Frost/Freeze, Gallatin

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Gallatin forecast zone
Reported by
AWOS
Coordinates
37.763, -88.230 (the zone’s center; the record gives no point)

Frost/Freeze, Hamilton

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Hamilton forecast zone
Reported by
AWOS
Coordinates
38.082, -88.539 (the zone’s center; the record gives no point)

Frost/Freeze, Hardin

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Hardin forecast zone
Reported by
AWOS
Coordinates
37.518, -88.267 (the zone’s center; the record gives no point)

Frost/Freeze, Jackson

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Jackson forecast zone
Reported by
AWOS
Coordinates
37.785, -89.382 (the zone’s center; the record gives no point)

Frost/Freeze, Jefferson

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Jefferson forecast zone
Reported by
AWOS
Coordinates
38.301, -88.924 (the zone’s center; the record gives no point)

Frost/Freeze, Johnson

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Johnson forecast zone
Reported by
AWOS
Coordinates
37.460, -88.881 (the zone’s center; the record gives no point)

Frost/Freeze, Massac

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Massac forecast zone
Reported by
AWOS
Coordinates
37.219, -88.708 (the zone’s center; the record gives no point)

Frost/Freeze, Perry

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Perry forecast zone
Reported by
AWOS
Coordinates
38.084, -89.367 (the zone’s center; the record gives no point)

Frost/Freeze, Pope

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Pope forecast zone
Reported by
AWOS
Coordinates
37.413, -88.562 (the zone’s center; the record gives no point)

Frost/Freeze, Pulaski

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Pulaski forecast zone
Reported by
AWOS
Coordinates
37.223, -89.127 (the zone’s center; the record gives no point)

Frost/Freeze, Saline

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Saline forecast zone
Reported by
AWOS
Coordinates
37.753, -88.541 (the zone’s center; the record gives no point)

Frost/Freeze, Union

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Union forecast zone
Reported by
AWOS
Coordinates
37.471, -89.255 (the zone’s center; the record gives no point)

Frost/Freeze, Wabash

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Wabash forecast zone
Reported by
AWOS
Coordinates
38.446, -87.844 (the zone’s center; the record gives no point)

Frost/Freeze, Wayne

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Wayne forecast zone
Reported by
AWOS
Coordinates
38.430, -88.426 (the zone’s center; the record gives no point)

Frost/Freeze, White

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
White forecast zone
Reported by
AWOS
Coordinates
38.088, -88.180 (the zone’s center; the record gives no point)

Frost/Freeze, Williamson

When
April 1, 2:00 AM CST to April 3, 8:00 AM CST
Where
Williamson forecast zone
Reported by
AWOS
Coordinates
37.730, -88.930 (the zone’s center; the record gives no point)

What these are

Frost/Freeze
Frost or temperatures at or below freezing during the growing season, usually filed for crop damage.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Illinois in 2021Every state in 2021This day in weather historyWarnings in Illinois, April 2021

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 947894, 947895, 947896, 947897, 947898, 947899, 947900, 947901, 947902, 947903, 947904, 947905, 947906, 947907, 947908, 947909, 947910, 947911, 947912.