Alert archive / Oklahoma / Freeze Warnings in 2021
Freeze Warning 4, NWS Tulsa, OK
NWS Tulsa, OK issued this freeze warning at Apr 21, 2021, 1:18 PM CDT for 4 counties in Arkansas; 5 counties in Oklahoma. It took effect at Apr 22, 2021, 1:00 AM CDT. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 21, 2021, 1:18 PM CDT (18:18 UTC)
- In effect from
- Apr 22, 2021, 1:00 AM CDT
- Expired
- Apr 22, 2021, 8:00 AM CDT
- In force
- 7 hr
- Issued by
- NWS Tulsa, OK
Counties Benton County, AR, Carroll County, AR, Madison County, AR, Washington County, AR, Adair County, OK, Craig County, OK, Delaware County, OK, Nowata County, OK, Ottawa County, OK
The radar
The Tulsa radar (KINX), 95 km from the middle of the area, began a volume at 18:19 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
Springfield, MO (KSGF), launched 12:00Z, 6.3 hours before the alert went out and 88 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1618 m above ground
- 0-6 km bulk shear
- 80 kt
- 0-1 km storm-relative helicity
- -21 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
166 WWUS74 KTSA 211818 NPWTSA URGENT - WEATHER MESSAGE National Weather Service Tulsa OK 118 PM CDT Wed Apr 21 2021 ARZ001-002-010-011-OKZ056>058-063-069-221300- /O.UPG.KTSA.FR.Y.0001.210422T0600Z-210422T1300Z/ /O.NEW.KTSA.FZ.W.0004.210422T0600Z-210422T1300Z/ Benton-Carroll-Washington AR-Madison-Nowata-Craig-Ottawa-Delaware- Adair- Including the cities of Rogers, Bentonville, Berryville, Eureka Springs, Fayetteville, Springdale, Huntsville, Nowata, Vinita, Miami, Grove, Jay, and Stilwell 118 PM CDT Wed Apr 21 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...In Oklahoma, Nowata, Craig, Ottawa, Delaware and Adair Counties. In Arkansas, Benton, Carroll, Washington AR and Madison Counties. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...These conditions will kill plants and other tender vegetation that are left outdoors or unprotected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Precautions should be taken to protect small plants and tender vegetation. && $$ Stay tuned to NOAA weather radio,commercial radio or television for the latest information,forecasts,and warnings. For more information from the National Weather Service visit https://weather.gov/tsa
2 follow-up statements
867 WWUS74 KTSA 220838 NPWTSA URGENT - WEATHER MESSAGE National Weather Service Tulsa OK 338 AM CDT Thu Apr 22 2021 ARZ001-002-010-011-OKZ056>058-063-069-221300- /O.CON.KTSA.FZ.W.0004.000000T0000Z-210422T1300Z/ Benton-Carroll-Washington AR-Madison-Nowata-Craig-Ottawa-Delaware- Adair- Including the cities of Rogers, Bentonville, Berryville, Eureka Springs, Fayetteville, Springdale, Huntsville, Nowata, Vinita, Miami, Grove, Jay, and Stilwell 338 AM CDT Thu Apr 22 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 31 expected. * WHERE...In Oklahoma, Nowata, Craig, Ottawa, Delaware and Adair Counties. In Arkansas, Benton, Carroll, Washington AR and Madison Counties. * WHEN...Until 8 AM CDT Thursday. * IMPACTS...These conditions will kill plants and other tender vegetation that are left outdoors or unprotected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Precautions should be taken to protect small plants and tender vegetation. && $$ Stay tuned to NOAA weather radio,commercial radio or television for the latest information,forecasts,and warnings. For more information from the National Weather Service visit https://weather.gov/tsa
914 WWUS74 KTSA 221255 NPWTSA URGENT - WEATHER MESSAGE National Weather Service Tulsa OK 755 AM CDT Thu Apr 22 2021 ARZ001-002-010-011-OKZ056>058-063-069-221400- /O.EXP.KTSA.FZ.W.0004.000000T0000Z-210422T1300Z/ Benton-Carroll-Washington AR-Madison-Nowata-Craig-Ottawa-Delaware- Adair- Including the cities of Rogers, Bentonville, Berryville, Eureka Springs, Fayetteville, Springdale, Huntsville, Nowata, Vinita, Miami, Grove, Jay, and Stilwell 755 AM CDT Thu Apr 22 2021 ...FREEZE WARNING WILL EXPIRE AT 8 AM CDT THIS MORNING... Temperatures have begun to warm above freezing over most locations this morning...with any remaining locations warming over the next hour. Thus...the freeze warning will be allowed to expire. $$ Stay tuned to NOAA weather radio,commercial radio or television for the latest information,forecasts,and warnings. For more information from the National Weather Service visit https://weather.gov/tsa
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 3:41 AM CDT | Frost Advisory | TSA | Benton, Carroll, Madison, Washington | 10 hr |
Nearby
Freeze Warnings in Oklahoma, 2021Freeze Warnings in Arkansas, 2021Every freeze warning 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.