Alert archive / Iowa / Frost Advisories in 2020

Frost Advisory 2, NWS Sioux Falls, SD

May 8, 20204 states

NWS Sioux Falls, SD issued this frost advisory at May 8, 2020, 3:32 AM CDT for 4 states. It took effect at May 9, 2020, 4:00 AM CDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
May 8, 2020, 3:32 AM CDT (08:32 UTC)
In effect from
May 9, 2020, 4:00 AM CDT
Expired
May 9, 2020, 8:00 AM CDT
In force
4 hr
Issued by
NWS Sioux Falls, SD
All 25 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Dakota County, NE, Dixon County, NE, Brookings County, SD, Lincoln County, SD, Minnehaha County, SD, Moody County, SD, Union County, SD

The radar

The Sioux Falls radar (KFSD), 66 km from the middle of the area, began a volume at 08:34 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 00:00Z, 8.5 hours before the alert went out and 224 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, Omaha, NE at 00:00Z on 2020-05-08Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2020-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
1360 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
394 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

366 
WWUS73 KFSD 080832
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
332 AM CDT Fri May 8 2020

IAZ001-002-MNZ081-089-090-082100-
/O.NEW.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
/O.CON.KFSD.FZ.W.0001.000000T0000Z-200508T1400Z/
Lyon-Osceola-Cottonwood-Nobles-Jackson-
332 AM CDT Fri May 8 2020

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING...
...FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM CDT SATURDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as low
  as 30. For the Frost Advisory, temperatures as low as 33 will 
  result in frost formation.

* WHERE...In Iowa, Lyon and Osceola Counties. In Minnesota, 
  Cottonwood, Nobles and Jackson Counties.

* WHEN...For the Freeze Warning, until 9 AM CDT this morning. 
  For the Frost Advisory, from 4 AM to 8 AM CDT Saturday.

* 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.

&&

$$

MNZ071-072-080-097-098-SDZ038>040-050-052>067-081400-
/O.CON.KFSD.FZ.W.0001.000000T0000Z-200508T1400Z/
Lincoln-Lyon-Murray-Pipestone-Rock-Beadle-Kingsbury-Brookings-
Gregory-Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-
Hanson-McCook-Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-
332 AM CDT Fri May 8 2020

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 30.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota and southwest Minnesota.

* WHEN...Until 9 AM CDT this morning.

* 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.

&&

$$

IAZ003-012>014-020-082100-
/O.NEW.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
/O.CON.KFSD.FR.Y.0001.000000T0000Z-200508T1400Z/
Dickinson-Sioux-O'Brien-Clay-Plymouth-
332 AM CDT Fri May 8 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING...
...FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM CDT SATURDAY...

* WHAT...For the first Frost Advisory, temperatures as low as 33 
  will result in frost formation. For the second Frost Advisory, 
  temperatures as low as 33 will result in frost formation.

* WHERE...Dickinson, Sioux, O'Brien, Clay and Plymouth Counties.

* WHEN...For the first Frost Advisory, until 9 AM CDT this 
  morning. For the second Frost Advisory, from 4 AM to 8 AM CDT 
  Saturday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

IAZ021-022-031-032-082100-
/O.NEW.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Cherokee-Buena Vista-Woodbury-Ida-
332 AM CDT Fri May 8 2020

...FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM CDT SATURDAY...

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

* WHERE...Cherokee, Buena Vista, Woodbury and Ida Counties.

* WHEN...From 4 AM to 8 AM CDT Saturday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NEZ013-SDZ068>071-081400-
/O.CON.KFSD.FR.Y.0001.000000T0000Z-200508T1400Z/
Dixon-Bon Homme-Yankton-Clay-Union-
332 AM CDT Fri May 8 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM CDT THIS MORNING...

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

* WHERE...In South Dakota, Yankton, Bon Homme, Clay and Union 
  Counties. In Nebraska, Dixon County.

* WHEN...Until 9 AM CDT this morning.

* IMPACTS...Frost could kill 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
http://weather.gov/siouxfalls
7 follow-up statements
052 
WWUS73 KFSD 081327
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
827 AM CDT Fri May 8 2020

IAZ001-002-MNZ081-089-090-090130-
/O.CAN.KFSD.FZ.W.0001.000000T0000Z-200508T1400Z/
/O.CON.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Lyon-Osceola-Cottonwood-Nobles-Jackson-
827 AM CDT Fri May 8 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 4 AM TO 8 AM CDT
SATURDAY...
...FREEZE WARNING IS CANCELLED...

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

* WHERE...In Iowa, Osceola and Lyon Counties. In Minnesota, 
  Cottonwood, Nobles and Jackson Counties.

* WHEN...From 4 AM to 8 AM CDT Saturday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

MNZ071-072-080-097-098-SDZ038>040-050-052>067-081430-
/O.CAN.KFSD.FZ.W.0001.000000T0000Z-200508T1400Z/
Lincoln-Lyon-Murray-Pipestone-Rock-Beadle-Kingsbury-Brookings-
Gregory-Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-
Hanson-McCook-Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-
827 AM CDT Fri May 8 2020

...FREEZE WARNING IS CANCELLED...

Sunshine and daytime heating have warmed temperatures above
freezing. Below normal temperatures continue through early next
week, so those with sensitive vegetation should continue to 
follow the forecast closely.

$$

IAZ003-012>014-020-090130-
/O.CAN.KFSD.FR.Y.0001.000000T0000Z-200508T1400Z/
/O.CON.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Dickinson-Sioux-O'Brien-Clay-Plymouth-
827 AM CDT Fri May 8 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 4 AM TO 8 AM CDT
SATURDAY...
...FROST ADVISORY IS CANCELLED...

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

* WHERE...O'Brien, Clay, Plymouth, Sioux and Dickinson Counties.

* WHEN...From 4 AM to 8 AM CDT Saturday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

NEZ013-SDZ068>071-081430-
/O.CAN.KFSD.FR.Y.0001.000000T0000Z-200508T1400Z/
Dixon-Bon Homme-Yankton-Clay-Union-
827 AM CDT Fri May 8 2020

...FROST ADVISORY IS CANCELLED...

Sunshine and daytime heating have warmed temperatures above
freezing. Below normal temperatures continue through early next
week, so those with sensitive vegetation should continue to 
follow the forecast closely.

$$

IAZ021-022-031-032-090130-
/O.CON.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Cherokee-Buena Vista-Woodbury-Ida-
827 AM CDT Fri May 8 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 4 AM TO 8 AM CDT
SATURDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

* WHERE...Buena Vista, Cherokee, Ida and Woodbury Counties.

* WHEN...From 4 AM to 8 AM CDT Saturday.

* IMPACTS...Frost could kill 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
http://weather.gov/siouxfalls
442 
WWUS73 KFSD 082015
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
315 PM CDT Fri May 8 2020

MNZ080-097-098-NEZ013-014-SDZ056-062-067-071-090415-
/O.EXA.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Murray-Pipestone-Rock-Dixon-Dakota-Moody-Minnehaha-Lincoln-Union-
315 PM CDT Fri May 8 2020

...FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM CDT SATURDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

* WHERE...In South Dakota, Moody, Minnehaha, Lincoln and Union 
  Counties. In Nebraska, Dixon and Dakota Counties. In 
  Minnesota, Murray, Pipestone and Rock Counties.

* WHEN...From 4 AM to 8 AM CDT Saturday.

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


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

IAZ001>003-012>014-020>022-031-032-MNZ081-089-090-090415-
/O.CON.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Cottonwood-Nobles-Jackson-
315 PM CDT Fri May 8 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 4 AM TO 8 AM CDT
SATURDAY...

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

* WHERE...O'Brien, Clay, Plymouth, Sioux and Dickinson Counties.

* WHEN...From 4 AM to 8 AM CDT Saturday.

* IMPACTS...Frost could kill 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
http://weather.gov/siouxfalls
197 
WWUS73 KFSD 090114
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
814 PM CDT Fri May 8 2020

MNZ071-SDZ040-090915-
/O.EXA.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Lincoln-Brookings-
814 PM CDT Fri May 8 2020

...FROST ADVISORY IN EFFECT FROM 4 AM TO 8 AM CDT SATURDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

* WHERE...In South Dakota, Brookings County. In Minnesota, 
  Lincoln County.

* WHEN...From 4 AM to 8 AM CDT Saturday.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold.

&&

$$

IAZ001>003-012>014-020>022-031-032-MNZ080-081-089-090-097-098-
NEZ013-014-SDZ056-062-067-071-090915-
/O.CON.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Moody-Minnehaha-Lincoln-Union-
814 PM CDT Fri May 8 2020

...FROST ADVISORY REMAINS IN EFFECT FROM 4 AM TO 8 AM CDT
SATURDAY...

* WHAT...Temperatures as low as 34 will result in frost 
  formation.

* WHERE...In South Dakota, Moody, Minnehaha, Lincoln and Union 
  Counties. In Nebraska, Dixon and Dakota Counties. In 
  Minnesota, Murray, Pipestone and Rock Counties.

* WHEN...From 4 AM to 8 AM CDT Saturday.

* IMPACTS...Frost could kill 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
http://weather.gov/siouxfalls
435 
WWUS73 KFSD 090838
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
338 AM CDT Sat May 9 2020

IAZ001-MNZ097-098-SDZ040-056-062-067-091645-
/O.NEW.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
/O.CON.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Lyon-Pipestone-Rock-Brookings-Moody-Minnehaha-Lincoln-
338 AM CDT Sat May 9 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING...
...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM CDT SUNDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as low
  as 30 expected. For the Frost Advisory, temperatures as low as
  30 to 35 with light winds will result in frost formation.

* WHERE...In South Dakota, Brookings, Moody, Minnehaha and 
  Lincoln Counties. In Iowa, Lyon County. In Minnesota, 
  Pipestone and Rock Counties.

* WHEN...For the Freeze Warning, from 2 AM to 8 AM CDT Sunday. 
  For the Frost Advisory, until 8 AM CDT this morning.

* 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.

&&

$$

SDZ038-039-050-052>055-057>061-063>066-068>070-091645-
/O.NEW.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Lake-Brule-Aurora-
Davison-Hanson-McCook-Charles Mix-Douglas-Hutchinson-Turner-
Bon Homme-Yankton-Clay-
338 AM CDT Sat May 9 2020

...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM CDT SUNDAY...

* WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...From 2 AM to 8 AM CDT Sunday.

* 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.

&&

$$

IAZ002-003-012>014-020>022-031-032-MNZ071-080-081-089-090-NEZ013-
014-SDZ071-091300-
/O.CON.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Dixon-Dakota-Union-
338 AM CDT Sat May 9 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING...

* WHAT...Temperatures as low as 32 to 35 and light winds will 
  result in frost formation.

* WHERE...In South Dakota, Union County. In Nebraska, Dixon and
  Dakota Counties. In Minnesota, Lincoln, Murray, Cottonwood,
  Nobles and Jackson Counties. In Iowa, Buena Vista, Woodbury and
  Ida counties.

* WHEN...Until 8 AM CDT Saturday.

* IMPACTS...Frost could kill 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
http://weather.gov/siouxfalls
436 
WWUS73 KFSD 090854
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
354 AM CDT Sat May 9 2020

IAZ001-MNZ097-098-SDZ040-056-062-067-091700-
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
/O.CON.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Lyon-Pipestone-Rock-Brookings-Moody-Minnehaha-Lincoln-
354 AM CDT Sat May 9 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING...
...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 30 expected. For the Frost Advisory, temperatures as 
  low as 30 to 35 with light winds will result in frost 
  formation.

* WHERE...In South Dakota, Brookings, Moody, Minnehaha and 
  Lincoln Counties. In Iowa, Lyon County. In Minnesota, 
  Pipestone and Rock Counties.

* WHEN...For the Freeze Warning, from 2 AM to 8 AM CDT Sunday. 
  For the Frost Advisory, until 8 AM CDT this morning.

* 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.

&&

$$

SDZ050-057-063-091700-
/O.NEW.KFSD.WI.Y.0013.200509T1900Z-200510T0100Z/
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
Gregory-Brule-Charles Mix-
354 AM CDT Sat May 9 2020

...WIND ADVISORY IN EFFECT FROM 2 PM THIS AFTERNOON TO 8 PM CDT
THIS EVENING...
...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as low
  as 28 expected. For the Wind Advisory, northwest winds 25 to 35
  mph with gusts up to 45 mph expected.

* WHERE...Gregory, Brule and Charles Mix Counties.

* WHEN...For the Freeze Warning, from 2 AM to 8 AM CDT Sunday. 
  For the Wind Advisory, from 2 PM this afternoon to 8 PM CDT 
  this evening.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result. Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

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.

&&

$$

SDZ038-039-052>055-058>061-064>066-068>070-091700-
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
Beadle-Kingsbury-Jerauld-Sanborn-Miner-Lake-Aurora-Davison-Hanson-
McCook-Douglas-Hutchinson-Turner-Bon Homme-Yankton-Clay-
354 AM CDT Sat May 9 2020

...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...

* WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...From 2 AM to 8 AM CDT Sunday.

* 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.

&&

$$

IAZ002-003-012>014-020>022-031-032-MNZ071-080-081-089-090-NEZ013-
014-SDZ071-091300-
/O.CON.KFSD.FR.Y.0002.200509T0900Z-200509T1300Z/
Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Dixon-Dakota-Union-
354 AM CDT Sat May 9 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING...

* WHAT...Temperatures as low as 32 to 35 and light winds will 
  result in frost formation.

* WHERE...In South Dakota, Union County. In Nebraska, Dixon and 
  Dakota Counties. In Minnesota, Lincoln, Murray, Cottonwood, 
  Nobles and Jackson Counties. In Iowa, Buena Vista, Woodbury 
  and Ida counties.

* WHEN...Until 8 AM CDT Saturday.

* IMPACTS...Frost could kill 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
http://weather.gov/siouxfalls
330 
WWUS73 KFSD 091146
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
646 AM CDT Sat May 9 2020

MNZ097-SDZ040-056-062-067-092000-
/O.CAN.KFSD.FR.Y.0002.000000T0000Z-200509T1300Z/
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
Pipestone-Brookings-Moody-Minnehaha-Lincoln-
646 AM CDT Sat May 9 2020

...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...
...FROST ADVISORY IS CANCELLED...

* WHAT...For the Freeze Warning tonight and early Sunday, sub-
  freezing temperatures as low as 30 expected. 

* WHERE...In South Dakota, Moody, Brookings, Lincoln and 
  Minnehaha Counties. In Minnesota, Pipestone County.

* WHEN...From 2 AM to 8 AM CDT Sunday.

* 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.

&&

$$

MNZ071-NEZ013-091300-
/O.CAN.KFSD.FR.Y.0002.000000T0000Z-200509T1300Z/
Lincoln-Dixon-
646 AM CDT Sat May 9 2020

...FROST ADVISORY IS CANCELLED...

Temperatures have warmed with southerly winds starting early this
morning.

$$

IAZ001-MNZ098-092000-
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
/O.CON.KFSD.FR.Y.0002.000000T0000Z-200509T1300Z/
Lyon-Rock-
646 AM CDT Sat May 9 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING...
...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 30 expected. For the Frost Advisory, temperatures as 
  low as 30 to 35 with light winds will result in frost 
  formation.

* WHERE...In South Dakota, Brookings, Moody, Minnehaha and 
  Lincoln Counties. In Iowa, Lyon County. In Minnesota, 
  Pipestone and Rock Counties.

* WHEN...For the Freeze Warning, from 2 AM to 8 AM CDT Sunday. 
  For the Frost Advisory, until 8 AM CDT this morning.

* 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.

&&

$$

SDZ050-057-063-092000-
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
/O.CON.KFSD.WI.Y.0013.200509T1900Z-200510T0100Z/
Gregory-Brule-Charles Mix-
646 AM CDT Sat May 9 2020

...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO
8 PM CDT THIS EVENING...
...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 28 expected. For the Wind Advisory, northwest winds 25 
  to 35 mph with gusts up to 45 mph expected.

* WHERE...Gregory, Brule and Charles Mix Counties.

* WHEN...For the Freeze Warning, from 2 AM to 8 AM CDT Sunday. 
  For the Wind Advisory, from 2 PM this afternoon to 8 PM CDT 
  this evening.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result. Frost and freeze conditions will kill crops, other 
  sensitive vegetation and possibly damage unprotected outdoor 
  plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

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.

&&

$$

SDZ038-039-052>055-058>061-064>066-068>070-092000-
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
Beadle-Kingsbury-Jerauld-Sanborn-Miner-Lake-Aurora-Davison-Hanson-
McCook-Douglas-Hutchinson-Turner-Bon Homme-Yankton-Clay-
646 AM CDT Sat May 9 2020

...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...

* WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...From 2 AM to 8 AM CDT Sunday.

* 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.

&&

$$

IAZ002-003-012>014-020>022-031-032-MNZ080-081-089-090-NEZ014-
SDZ071-091300-
/O.CON.KFSD.FR.Y.0002.000000T0000Z-200509T1300Z/
Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Murray-Cottonwood-Nobles-Jackson-Dakota-
Union-
646 AM CDT Sat May 9 2020

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING...

* WHAT...Temperatures as low as 32 to 35 and light winds will 
  result in frost formation.

* WHERE...In South Dakota, Union County. In Nebraska, Dixon and 
  Dakota Counties. In Minnesota, Lincoln, Murray, Cottonwood, 
  Nobles and Jackson Counties. In Iowa, Buena Vista, Woodbury 
  and Ida counties.

* WHEN...Until 8 AM CDT Saturday.

* IMPACTS...Frost could kill 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
http://weather.gov/siouxfalls
421 
WWUS73 KFSD 091239
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
739 AM CDT Sat May 9 2020

IAZ001-MNZ098-100000-
/O.EXP.KFSD.FR.Y.0002.000000T0000Z-200509T1300Z/
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
Lyon-Rock-
739 AM CDT Sat May 9 2020

...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...
...FROST ADVISORY WILL EXPIRE AT 8 AM CDT THIS MORNING...

* WHAT...Sub-freezing temperatures as low as 31 expected.

* WHERE...In Iowa, Lyon County. In Minnesota, Rock County.

* WHEN...From 2 AM to 8 AM CDT Sunday.

* IMPACTS...Frost and freeze conditions may 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.

&&

$$

IAZ002-003-012>014-020>022-031-032-MNZ080-081-089-090-NEZ014-
SDZ071-091345-
/O.EXP.KFSD.FR.Y.0002.000000T0000Z-200509T1300Z/
Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Murray-Cottonwood-Nobles-Jackson-Dakota-
Union-
739 AM CDT Sat May 9 2020

...FROST ADVISORY WILL EXPIRE AT 8 AM CDT THIS MORNING...

Morning sunshine has begun to warm surface temperatures, therefore
the Frost Advisory will be allowed to expire.

$$

SDZ050-057-063-100000-
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
/O.CON.KFSD.WI.Y.0013.200509T1900Z-200510T0100Z/
Gregory-Brule-Charles Mix-
739 AM CDT Sat May 9 2020

...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO
8 PM CDT THIS EVENING...
...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...

* WHAT...For the Freeze Warning, sub-freezing temperatures as 
  low as 28 expected. For the Wind Advisory, northwest winds 20 
  to 30 mph with gusts up to 45 mph expected.

* WHERE...Charles Mix, Brule and Gregory Counties.

* WHEN...For the Freeze Warning, from 2 AM to 8 AM CDT Sunday. 
  For the Wind Advisory, from 2 PM this afternoon to 8 PM CDT 
  this evening.

* IMPACTS...Gusty winds could blow around unsecured objects. Frost
  and freeze conditions may kill crops, other sensitive 
  vegetation and possibly damage unprotected outdoor plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

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.

&&

$$

MNZ097-SDZ038>040-052>056-058>062-064>070-100000-
/O.CON.KFSD.FZ.W.0002.200510T0700Z-200510T1300Z/
Pipestone-Beadle-Kingsbury-Brookings-Jerauld-Sanborn-Miner-Lake-
Moody-Aurora-Davison-Hanson-McCook-Minnehaha-Douglas-Hutchinson-
Turner-Lincoln-Bon Homme-Yankton-Clay-
739 AM CDT Sat May 9 2020

...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM CDT
SUNDAY...

* WHAT...Sub-freezing temperatures as low as 29 expected.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota and southwest Minnesota.

* WHEN...From 2 AM to 8 AM CDT Sunday.

* IMPACTS...Frost and freeze conditions may 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
http://weather.gov/siouxfalls

What forecasters said that day

The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this frost advisory went out at May 7, 10:28 PM CDT, 5 hours 4 minutes earlier.

Area forecast discussion, May 7, 10:28 PM CDT, 5 hours 4 minutes before
AREA FORECAST DISCUSSION
National Weather Service Sioux Falls SD
1028 PM CDT Thu May 7 2020

.SHORT TERM...(This Evening through Friday Night)
Issued at 345 PM CDT Thu May 7 2020

Satellite imagery shows the upper level wave spinning near the
WY/SD/NE border at 20Z, and will continue to track southeastwards
throughout the evening. Dry air on the northeast axis has largely
kept the band of rain from moving further north and east than
initially anticipated. The axis of highest rainfall rates will
continue to pivot across the area, ending up with a more west to
east orientation before moving southwards out of the area
overnight. A small convective line has formed this afternoon from
De Smet to Flandreau to Worthington, which will produce a brief
period of rain this afternoon as it moves south. Expect an
additional 0.5-0.75 inches along the Missouri River Valley
overnight, with less than a quarter inch along a line from Huron
to Sioux Falls to Storm Lake. An upper level jet will push the
vorticity lobe out of the area overnight, ending our precipitation
event and clearing out our cloud coverage.

Clearing clouds will allow for radiational cooling, and in
combination with northerly winds bringing a cold front to the area,
will cause temperatures to reach below or near freezing overnight.
Sub-freezing temperatures are looking most likely along and north of
I-90 with a small stretch along the Missouri River Valley in central
SD, all of which are now under a freeze warning. NBM probabilities
of temperatures reaching at least freezing tomorrow morning are 50%
or greater in these areas. Counties south and along the freeze
warning are less likely to reach freezing but do have a chance for
frost (thus have been put under a frost advisory), with counties
south of there having even less of a chance.

With northerly flow aloft firmly in place and the cold front south
of the area, temperatures will struggle to get above mid 50s despite
ample sunshine. On top of that, the backing wind profile with a
heightened pressure gradient will keep winds fairly breezy throughout
the day, making temperatures feel a couple degrees cooler than they
already are. Good news is no precipitation is expected on Friday,
with winds decreasing overnight.

.LONG TERM...(Saturday through Thursday)
Issued at 345 PM CDT Thu May 7 2020

Northerly flow aloft continues into middle of next week, leading to
a period of below average temperatures with a couple chances for
some precipitation. First chance arrives on Saturday as an Alberta
Clipper slides by our north and east, with a small chance at seeing
snow in the morning (but nothing that would accumulate). Winds with
this system do appear to be on the breezy side, with gusts up to 30
mph possible west of the James River valley. The rain will likely be
over by Sunday morning, as another high pressure slides down from
Canada feeding colder air into the region.

This will keep temperatures cool on Sunday, with Sunday night
bringing another chance at below freezing temperatures. NBM
probabilities reveal a large portion of the area has greater than 50
percent chance, with only a couple counties currently being spared.
As the upper level pattern becomes more zonal on Tuesday, a low
pressure system moves down from the central rockies to bring another
chance at rain for the area. The zonal flow does start to bring back
warmer temperatures, but current indications only show average highs
to finish off the work week.

&&

.AVIATION...(For the 06Z TAFS through 06Z Friday night)
Issued at 1027 PM CDT Thu May 7 2020

Showers will pull out of the area around 06Z. Otherwise, VFR
conditions expected through the TAF period.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...Frost Advisory from 3 AM to 9 AM CDT Friday for SDZ068>071.

     Freeze Warning from 3 AM to 9 AM CDT Friday for SDZ038>040-050-
     052>067.

MN...Freeze Warning from 3 AM to 9 AM CDT Friday for MNZ071-072-080-
     081-089-090-097-098.

IA...Frost Advisory from 3 AM to 9 AM CDT Friday for IAZ003-012>014-
     020.

     Freeze Warning from 3 AM to 9 AM CDT Friday for IAZ001-002.

NE...Frost Advisory from 3 AM to 9 AM CDT Friday for NEZ013.

&&

SHORT TERM...APT
LONG TERM...APT
AVIATION...JM
Hazardous weather outlook, May 7, 6:50 PM CDT, 8 hours 42 minutes before
Hazardous Weather Outlook
National Weather Service Sioux Falls SD
650 PM CDT Thu May 7 2020

IAZ001-002-MNZ071-072-080-081-089-090-097-098-SDZ038>040-050-
052>067-090000-
Lyon-Osceola-Lincoln-Murray-Cottonwood-Nobles-Jackson-Pipestone-
Rock-Beadle-Kingsbury-Brookings-Gregory-Jerauld-Sanborn-Miner-
Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha-
Charles Mix-Douglas-Hutchinson-Turner-
650 PM CDT Thu May 7 2020

This Hazardous Weather Outlook is for portions of northwest Iowa,
southwest Minnesota, central South Dakota, east central South
Dakota, south central South Dakota, and southeast South Dakota.

.DAY ONE...Tonight

Areas of frost or freezing temperatures are expected tonight as
temperatures fall to near 30.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Areas of frost or freezing temperatures are possible this weekend
with overnight low temperatures falling into the lower to mid 30s.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

IAZ003-012>014-020-NEZ013-SDZ068>071-090000-
Dickinson-Sioux-O'Brien-Clay-Plymouth-Dixon-Bon Homme-Yankton-
Union-
650 PM CDT Thu May 7 2020

This Hazardous Weather Outlook is for portions of northwest Iowa,
northeast Nebraska, and southeast South Dakota.

.DAY ONE...Tonight

Areas of frost or freezing temperatures are expected tonight as
temperatures fall into the lower 30s.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Areas of frost or freezing temperatures are possible this weekend
with overnight low temperatures falling into the lower to mid 30s.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

IAZ021-022-031-032-NEZ014-090000-
Cherokee-Buena Vista-Woodbury-Ida-Dakota-
650 PM CDT Thu May 7 2020

This Hazardous Weather Outlook is for portions of northwest Iowa,
west central Iowa, and northeast Nebraska.

.DAY ONE...Tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Areas of frost or freezing temperatures are possible this weekend
with overnight low temperatures falling into the lower to mid 30s.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

Nearby

Frost Advisories in Iowa, 2020Frost Advisories in Minnesota, 2020Frost Advisories in South Dakota, 2020Every frost advisory in 2020

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.