Alert archive / Kansas / Frost Advisories in 2021

Frost Advisory 4, NWS Topeka, KS

April 17, 20219 counties in Kansas

NWS Topeka, KS issued this frost advisory at Apr 17, 2021, 3:25 AM CDT for 9 counties in Kansas. It took effect at Apr 18, 2021, 3:00 AM CDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Apr 17, 2021, 3:25 AM CDT (08:25 UTC)
In effect from
Apr 18, 2021, 3:00 AM CDT
Expired
Apr 18, 2021, 8:00 AM CDT
In force
5 hr
Issued by
NWS Topeka, KS

Counties Clay County, KS, Cloud County, KS, Dickinson County, KS, Geary County, KS, Marshall County, KS, Ottawa County, KS, Republic County, KS, Riley County, KS, Washington County, KS

The radar

The Topeka radar (KTWX), 91 km from the middle of the area, began a volume at 08:27 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

Topeka, KS (KTOP), launched 00:00Z, 8.4 hours before the alert went out and 137 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, Topeka, KS at 00:00Z on 2021-04-17Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 00:00Z on 2021-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.1939587897Sfc1 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
602 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
141 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

962 
WWUS73 KTOP 170825
NPWTOP

URGENT - WEATHER MESSAGE
National Weather Service Topeka KS
325 AM CDT Sat Apr 17 2021

KSZ008>010-020>022-034>036-172100-
/O.NEW.KTOP.FR.Y.0004.210418T0800Z-210418T1300Z/
Republic-Washington-Marshall-Cloud-Clay-Riley-Ottawa-Dickinson-
Geary-
Including the cities of Belleville, Washington, Hanover, Clifton,
Linn, Greenleaf, Marysville, Blue Rapids, Frankfort, Concordia, 
Clay Center, Manhattan, Minneapolis, Bennington, Abilene, 
Herington, and Junction City
325 AM CDT Sat Apr 17 2021

...FROST ADVISORY IN EFFECT FROM 3 AM TO 8 AM CDT SUNDAY...

* WHAT...Temperatures as low as 33 will result in frost 
  formation.

* WHERE...Republic, Washington, Marshall, Cloud, Clay, Riley, 
  Ottawa, Dickinson and Geary Counties.

* WHEN...From 3 AM to 8 AM CDT Sunday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps today to protect tender plants from the cold.

&&

$$

Wolters
2 follow-up statements
759 
WWUS73 KTOP 172003
NPWTOP

URGENT - WEATHER MESSAGE
National Weather Service Topeka KS
303 PM CDT Sat Apr 17 2021

KSZ008>010-020>022-034>036-181300-
/O.CON.KTOP.FR.Y.0004.210418T0800Z-210418T1300Z/
Republic-Washington-Marshall-Cloud-Clay-Riley-Ottawa-Dickinson-
Geary-
Including the cities of Belleville, Washington, Hanover, Clifton,
Linn, Greenleaf, Marysville, Blue Rapids, Frankfort, Concordia, 
Clay Center, Manhattan, Minneapolis, Bennington, Abilene, 
Herington, and Junction City
303 PM CDT Sat Apr 17 2021

...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 8 AM CDT
SUNDAY...

* WHAT...Temperatures as low as 33 will result in frost 
  formation.

* WHERE...Republic, Washington, Marshall, Cloud, Clay, Riley, 
  Ottawa, Dickinson and Geary Counties.

* WHEN...From 3 AM to 8 AM CDT Sunday.

* IMPACTS...Frost could kill sensitive outdoor vegetation if 
  left uncovered.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$
185 
WWUS73 KTOP 180833
NPWTOP

URGENT - WEATHER MESSAGE
National Weather Service Topeka KS
333 AM CDT Sun Apr 18 2021

KSZ008>010-020>022-034>036-181645-
/O.NEW.KTOP.FZ.A.0001.210420T0300Z-210420T1500Z/
/O.NEW.KTOP.FZ.A.0002.210421T0200Z-210421T1500Z/
/O.CON.KTOP.FR.Y.0004.000000T0000Z-210418T1300Z/
Republic-Washington-Marshall-Cloud-Clay-Riley-Ottawa-Dickinson-
Geary-
Including the cities of Belleville, Washington, Hanover, Clifton,
Linn, Greenleaf, Marysville, Blue Rapids, Frankfort, Concordia, 
Clay Center, Manhattan, Minneapolis, Bennington, Abilene, 
Herington, and Junction City
333 AM CDT Sun Apr 18 2021

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING...
...FREEZE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
MORNING...
...FREEZE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY
MORNING...

The National Weather Service in Topeka has issued a Freeze Watch,
which is in effect from Monday evening through Tuesday morning. A
Freeze Watch has also been issued from Tuesday evening through
Wednesday morning. 

* WHAT...Temperatures as low as 33 this morning will result in
  frost formation. Freezing temperatures around 29 are forecast
  for Tuesday morning and a killing freeze with temperatures in
  the middle 20s for Wednesday morning. 

* WHERE...Republic, Washington, Marshall, Cloud, Clay, Riley, 
  Ottawa, Dickinson and Geary Counties. 

* WHEN...From 3 AM to 8 AM CDT Sunday.

* TEMPERATURE...Freezing temperatures could last for as much as 8
  hours Tuesday night and Wednesday morning. 

* Impacts...The cold weather could kill sensitive outdoor
  vegetation if left unprotected. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

A Freeze Watch means sub-freezing temperatures are possible.
These conditions could kill crops and other sensitive vegetation.

&&

$$

KSZ011-012-023-024-026-037>040-054>056-058-059-181645-
/O.NEW.KTOP.FZ.A.0001.210420T0300Z-210420T1500Z/
/O.NEW.KTOP.FZ.A.0002.210421T0200Z-210421T1500Z/
Nemaha-Brown-Pottawatomie-Jackson-Jefferson-Morris-Wabaunsee-
Shawnee-Douglas-Lyon-Osage-Franklin-Coffey-Anderson-
Including the cities of Sabetha, Seneca, Hiawatha, Horton, 
Wamego, St. Marys, Holton, Valley Falls, Oskaloosa, Perry, 
McLouth, Grantville, Meriden, Nortonville, Council Grove, Alma, 
Eskridge, Maple Hill, Alta Vista, McFarland, Harveyville, Paxico,
Topeka, Lawrence, Emporia, Osage City, Carbondale, Lyndon, 
Burlingame, Overbrook, Ottawa, Burlington, Lebo, and Garnett
333 AM CDT Sun Apr 18 2021

...FREEZE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
MORNING...
...FREEZE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY
MORNING...

The National Weather Service in Topeka has issued a Freeze Watch,
which is in effect from Monday evening through Tuesday morning. A
Freeze Watch has also been issued from Tuesday evening through
Wednesday morning. 

* TEMPERATURE...Lows Tuesday morning are expected to be around 31
  degrees. A killing freeze is forecast for Wednesday morning with
  readings expected to fall into the middle 20s and temperatures
  below freezing for as much as 8 hours. 

* IMPACTS...The cold weather could kill sensitive outdoor 
  vegetation if left unprotected. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Watch means sub-freezing temperatures are possible.
These conditions could kill crops and other sensitive vegetation.

&&

$$

Wolters

Nearby

Frost Advisories in Kansas, 2021Every frost advisory in 2021

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.