Alert archive / Iowa / Frost Advisories in 2021
Frost Advisory 2, NWS Des Moines, IA
NWS Des Moines, IA issued this frost advisory at Apr 14, 2021, 3:14 PM CDT for 15 counties in Iowa. It took effect at Apr 15, 2021, 1:00 AM CDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Apr 14, 2021, 3:14 PM CDT (20:14 UTC)
- In effect from
- Apr 15, 2021, 1:00 AM CDT
- Expired
- Apr 15, 2021, 8:00 AM CDT
- In force
- 7 hr
- Issued by
- NWS Des Moines, IA
Counties Adair County, IA, Appanoose County, IA, Clarke County, IA, Davis County, IA, Decatur County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Ringgold County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA
The radar
The Des Moines radar (KDMX), 82 km from the middle of the area, began a volume at 20:12 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, 8.2 hours before the alert went out and 250 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
- 1250 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- -101 m²/s²
- 0-3 km storm-relative helicity
- -49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
724 WWUS73 KDMX 142014 NPWDMX URGENT - WEATHER MESSAGE National Weather Service Des Moines IA Issued by National Weather Service Omaha/Valley NE 314 PM CDT Wed Apr 14 2021 IAZ070-081-092-151300- /O.NEW.KDMX.FZ.W.0001.210415T0600Z-210415T1300Z/ Cass-Adams-Taylor- Including the cities of Atlantic, Corning, Bedford, Lenox, and New Market 314 PM CDT Wed Apr 14 2021 ...FREEZE WARNING IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 28 expected, with the coldest temperatures in valleys. * WHERE...Mainly in portions of southwest Iowa. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost and freeze conditions may damage some crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing if protective measures are not taken. 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 consider draining them and cover above- ground pipes to protect them from freezing. && $$ IAZ071>075-082>086-093>097-151300- /O.NEW.KDMX.FR.Y.0002.210415T0600Z-210415T1300Z/ Adair-Madison-Warren-Marion-Mahaska-Union-Clarke-Lucas-Monroe- Wapello-Ringgold-Decatur-Wayne-Appanoose-Davis- Including the cities of Greenfield, Stuart, Adair, Fontanelle, Winterset, Earlham, Indianola, Norwalk, Carlisle, Pella, Knoxville, Oskaloosa, Creston, Osceola, Chariton, Albia, Ottumwa, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, Humeston, Centerville, and Bloomfield 314 PM CDT Wed Apr 14 2021 ...FROST ADVISORY IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Much of south central and southeast Iowa. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could damage sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit https://weather.gov/desmoines
2 follow-up statements
163 WWUS73 KDMX 150217 NPWDMX URGENT - WEATHER MESSAGE National Weather Service Des Moines IA 917 PM CDT Wed Apr 14 2021 IAZ070-081-092-151100- /O.CON.KDMX.FZ.W.0001.210415T0600Z-210415T1300Z/ Cass-Adams-Taylor- Including the cities of Atlantic, Corning, Bedford, Lenox, and New Market 917 PM CDT Wed Apr 14 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Sub-freezing temperatures as low as 28 expected, with the coldest temperatures in valleys. * WHERE...Mainly in portions of southwest Iowa. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost and freeze conditions may damage some crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing if protective measures are not taken. 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. Consider covering above-ground pipes to protect them from freezing. && $$ IAZ071>075-082>086-093>097-151100- /O.CON.KDMX.FR.Y.0002.210415T0600Z-210415T1300Z/ Adair-Madison-Warren-Marion-Mahaska-Union-Clarke-Lucas-Monroe- Wapello-Ringgold-Decatur-Wayne-Appanoose-Davis- Including the cities of Greenfield, Stuart, Adair, Fontanelle, Winterset, Earlham, Indianola, Norwalk, Carlisle, Pella, Knoxville, Oskaloosa, Creston, Osceola, Chariton, Albia, Ottumwa, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, Humeston, Centerville, and Bloomfield 917 PM CDT Wed Apr 14 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Much of south central and southeast Iowa. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could damage sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit https://weather.gov/desmoines Small
237 WWUS73 KDMX 150835 NPWDMX URGENT - WEATHER MESSAGE National Weather Service Des Moines IA 335 AM CDT Thu Apr 15 2021 IAZ070-081-092-151300- /O.CON.KDMX.FZ.W.0001.000000T0000Z-210415T1300Z/ Cass-Adams-Taylor- Including the cities of Atlantic, Corning, Bedford, Lenox, and New Market 335 AM CDT Thu Apr 15 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...Sub-freezing temperatures as low as 28 expected, with the coldest temperatures in valleys. * WHERE...Mainly in portions of southwest Iowa. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost and freeze conditions may damage some crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing if protective measures are not taken. 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. && $$ IAZ071>075-082>086-093>097-151300- /O.CON.KDMX.FR.Y.0002.000000T0000Z-210415T1300Z/ Adair-Madison-Warren-Marion-Mahaska-Union-Clarke-Lucas-Monroe- Wapello-Ringgold-Decatur-Wayne-Appanoose-Davis- Including the cities of Greenfield, Stuart, Adair, Fontanelle, Winterset, Earlham, Indianola, Norwalk, Carlisle, Pella, Knoxville, Oskaloosa, Creston, Osceola, Chariton, Albia, Ottumwa, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, Humeston, Centerville, and Bloomfield 335 AM CDT Thu Apr 15 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Much of south central and southeast Iowa. * WHEN...From 1 AM to 8 AM CDT Thursday. * IMPACTS...Frost could damage sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ 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 14, 3:14 PM CDT | Freeze Warning | DMX | Adams, Cass, Taylor | 17 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.