Alert archive / Iowa / Freeze Warnings in 2021
Freeze Warning 2, NWS Des Moines, IA
NWS Des Moines, IA issued this freeze warning at Apr 19, 2021, 2:56 PM CDT for 27 counties in Iowa. It took effect at Apr 20, 2021, 12:00 AM CDT. It was in force for 9 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 19, 2021, 2:56 PM CDT (19:56 UTC)
- In effect from
- Apr 20, 2021, 12:00 AM CDT
- Expired
- Apr 20, 2021, 9:00 AM CDT
- In force
- 9 hr
- Issued by
- NWS Des Moines, IA
All 27 counties
Adair County, IA, Adams County, IA, Appanoose County, IA, Audubon County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Guthrie County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 50 km from the middle of the area, began a volume at 20:01 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
Omaha, NE (KOAX), launched 12:00Z, 7.9 hours before the alert went out and 232 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
- 588 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- -81 m²/s²
- 0-3 km storm-relative helicity
- 384 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
137 WWUS73 KDMX 191956 NPWDMX URGENT - WEATHER MESSAGE National Weather Service Des Moines IA 256 PM CDT Mon Apr 19 2021 IAZ049-050-059>062-070>075-081>086-092>097-200400- /O.UPG.KDMX.FZ.A.0001.210421T0000Z-210421T1500Z/ /O.NEW.KDMX.FZ.W.0003.210421T0500Z-210421T1400Z/ /O.NEW.KDMX.FZ.W.0002.210420T0500Z-210420T1400Z/ Marshall-Tama-Dallas-Polk-Jasper-Poweshiek-Cass-Adair-Madison- Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello- Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- Including the cities of Marshalltown, Tama, Toledo, Traer, Dysart, Gladbrook, Perry, Waukee, Adel, Des Moines, Newton, Grinnell, Atlantic, Greenfield, Stuart, Adair, Fontanelle, Winterset, Earlham, Indianola, Norwalk, Carlisle, Pella, Knoxville, Oskaloosa, Corning, Creston, Osceola, Chariton, Albia, Ottumwa, Bedford, Lenox, New Market, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, Humeston, Centerville, and Bloomfield 256 PM CDT Mon Apr 19 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT TUESDAY... ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TUESDAY NIGHT TO 9 AM CDT WEDNESDAY... * WHAT...For the first Freeze Warning, sub-freezing temperatures as low as the upper 20s expected. For the second Freeze Warning, sub-freezing temperatures as low as middle to upper 20s expected. * WHERE...Central and Southern Iowa. * WHEN...For the first Freeze Warning, from midnight tonight to 9 AM CDT Tuesday. For the second Freeze Warning, from midnight Tuesday night to 9 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ IAZ048-057-058-200400- /O.NEW.KDMX.FZ.W.0002.210420T0500Z-210420T1400Z/ /O.NEW.KDMX.FZ.W.0003.210421T0500Z-210421T1400Z/ Story-Audubon-Guthrie- Including the cities of Ames, Audubon, Exira, Guthrie Center, Panora, Bayard, and Casey 256 PM CDT Mon Apr 19 2021 ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT TUESDAY... ...FREEZE WARNING IN EFFECT FROM MIDNIGHT TUESDAY NIGHT TO 9 AM CDT WEDNESDAY... * WHAT...For the first Freeze Warning, sub-freezing temperatures as low as around 30 degrees expected. For the second Freeze Warning, sub- freezing temperatures as low as middle 20s expected. * WHERE...Central and Southern Iowa. * WHEN...For the first Freeze Warning, from midnight tonight to 9 AM CDT Tuesday. For the second Freeze Warning, from midnight Tuesday night to 9 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ For more information from the National Weather Service visit https://weather.gov/desmoines
3 follow-up statements
889 WWUS73 KDMX 200158 NPWDMX URGENT - WEATHER MESSAGE National Weather Service Des Moines IA 858 PM CDT Mon Apr 19 2021 IAZ048>050-057>062-070>075-081>086-092>097-201000- /O.CON.KDMX.FZ.W.0002.210420T0500Z-210420T1400Z/ /O.CON.KDMX.FZ.W.0003.210421T0500Z-210421T1400Z/ Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek- Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- Including the cities of Ames, Marshalltown, Tama, Toledo, Traer, Dysart, Gladbrook, Audubon, Exira, Guthrie Center, Panora, Bayard, Casey, Perry, Waukee, Adel, Des Moines, Newton, Grinnell, Atlantic, Greenfield, Stuart, Adair, Fontanelle, Winterset, Earlham, Indianola, Norwalk, Carlisle, Pella, Knoxville, Oskaloosa, Corning, Creston, Osceola, Chariton, Albia, Ottumwa, Bedford, Lenox, New Market, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, Humeston, Centerville, and Bloomfield 858 PM CDT Mon Apr 19 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT TUESDAY... ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TUESDAY NIGHT TO 9 AM CDT WEDNESDAY... * WHAT...For the first Freeze Warning, sub-freezing temperatures as low as around 30 degrees expected. For the second Freeze Warning, sub- freezing temperatures as low as middle 20s expected. * WHERE...Central and Southern Iowa. * WHEN...For the first Freeze Warning, from midnight tonight to 9 AM CDT Tuesday. For the second Freeze Warning, from midnight Tuesday night to 9 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ For more information from the National Weather Service visit https://weather.gov/desmoines
049 WWUS73 KDMX 200830 NPWDMX URGENT - WEATHER MESSAGE National Weather Service Des Moines IA 330 AM CDT Tue Apr 20 2021 IAZ048>050-057>062-070>075-081>086-092>097-201630- /O.CON.KDMX.FZ.W.0002.000000T0000Z-210420T1400Z/ /O.CON.KDMX.FZ.W.0003.210421T0500Z-210421T1400Z/ Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek- Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- Including the cities of Ames, Marshalltown, Tama, Toledo, Traer, Dysart, Gladbrook, Audubon, Exira, Guthrie Center, Panora, Bayard, Casey, Perry, Waukee, Adel, Des Moines, Newton, Grinnell, Atlantic, Greenfield, Stuart, Adair, Fontanelle, Winterset, Earlham, Indianola, Norwalk, Carlisle, Pella, Knoxville, Oskaloosa, Corning, Creston, Osceola, Chariton, Albia, Ottumwa, Bedford, Lenox, New Market, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, Humeston, Centerville, and Bloomfield 330 AM CDT Tue Apr 20 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING... ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT WEDNESDAY... * WHAT...For this morning, temperatures of around or a few degrees below freezing are expected. For Wednesday morning, temperatures as low as the mid to upper 20s are expected. * WHERE...Central and Southern Iowa. * WHEN...For the first Freeze Warning, through 9 AM CDT today. For the second Freeze Warning, from midnight tonight to 9 AM CDT Wednesday. * IMPACTS...Freezing conditions will damage sensitive vegetation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. && $$ For more information from the National Weather Service visit https://weather.gov/desmoines
366 WWUS73 KDMX 201410 NPWDMX URGENT - WEATHER MESSAGE National Weather Service Des Moines IA 910 AM CDT Tue Apr 20 2021 IAZ048>050-057>062-070>075-081>086-092>097-202215- /O.EXP.KDMX.FZ.W.0002.000000T0000Z-210420T1400Z/ /O.CON.KDMX.FZ.W.0003.210421T0500Z-210421T1400Z/ Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek- Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- Including the cities of Ames, Marshalltown, Tama, Toledo, Traer, Dysart, Gladbrook, Audubon, Exira, Guthrie Center, Panora, Bayard, Casey, Perry, Waukee, Adel, Des Moines, Newton, Grinnell, Atlantic, Greenfield, Stuart, Adair, Fontanelle, Winterset, Earlham, Indianola, Norwalk, Carlisle, Pella, Knoxville, Oskaloosa, Corning, Creston, Osceola, Chariton, Albia, Ottumwa, Bedford, Lenox, New Market, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, Humeston, Centerville, and Bloomfield 910 AM CDT Tue Apr 20 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM CDT WEDNESDAY... ...FREEZE WARNING FROM LAST NIGHT HAS EXPIRED... * WHAT...Sub-freezing temperatures as low as 27 expected. * WHERE...Central and Southern Iowa. * WHEN...From midnight tonight to 9 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ For more information from the National Weather Service visit https://weather.gov/desmoines
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 3:28 AM CDT | Freeze Watch | DMX | Adair, Adams, Appanoose, Cass, Clarke, Dallas and 18 more | 11 hr |
| Apr 19, 2:56 PM CDT | Freeze Warning | DMX | Adair, Adams, Appanoose, Audubon, Cass, Clarke and 21 more | 42 hr |
Nearby
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.