Alert archive / South Dakota / Red Flag Warnings in 2021

Red Flag Warning 7, NWS Aberdeen, SD

April 2, 202110 counties in South Dakota; Big Stone County, Traverse County, Minnesota

NWS Aberdeen, SD issued this red flag warning at Apr 2, 2021, 2:54 AM CDT for 10 counties in South Dakota; Big Stone County, Traverse County, Minnesota. It took effect at Apr 2, 2021, 12:00 PM CDT. It was in force for 8 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 2, 2021, 2:54 AM CDT (07:54 UTC)
In effect from: Apr 2, 2021, 12:00 PM CDT
Expired: Apr 2, 2021, 8:00 PM CDT
In force: 8 hr
Issued by: NWS Aberdeen, SD

Counties Big Stone County, MN, Traverse County, MN, Campbell County, SD, Codington County, SD, Corson County, SD, Deuel County, SD, Dewey County, SD, Grant County, SD, Hamlin County, SD, McPherson County, SD, Roberts County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 17 km from the middle of the area, began a volume at 07:55 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

Aberdeen, SD (KABR), launched 00:00Z, 7.9 hours before the alert went out and 52 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2918 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 383 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

749 
WWUS83 KABR 020754
RFWABR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Aberdeen SD
254 AM CDT Fri Apr 2 2021

SDZ003>005-009-015-021600-
/O.NEW.KABR.FW.W.0007.210402T1800Z-210403T0100Z/
Corson-Campbell-McPherson-Walworth-Dewey-
254 AM CDT Fri Apr 2 2021 /154 AM MDT Fri Apr 2 2021/

...RED FLAG WARNING IN EFFECT FROM 1 PM CDT /NOON MDT/ THIS
AFTERNOON TO 8 PM CDT /7 PM MDT/ THIS EVENING FOR WIND AND LOW
RELATIVE HUMIDITY FOR NORTH CENTRAL SD...

The National Weather Service in Aberdeen has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from 1 PM CDT /noon MDT/ this afternoon to 8 PM CDT /7 PM MDT/
this evening.

* AFFECTED AREA...In South Dakota, Corson, Campbell, McPherson, 
  Walworth and Dewey.

* WINDS...Northwest 10 to 20 mph with gusts up to 30 mph.

* RELATIVE HUMIDITY...As low as 10 percent.

* IMPACTS...The combination of gusty winds and low relative 
  humidity will produce critical fire weather conditions. Any 
  fires will spread rapidly and become difficult to control and 
  suppress.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity, and warm temperatures can
contribute to extreme fire behavior.

&&

$$

3 follow-up statements

988 
WWUS83 KABR 021516
RFWABR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Aberdeen SD
1016 AM CDT Fri Apr 2 2021

SDZ003>005-009-015-030100-
/O.CON.KABR.FW.W.0007.210402T1800Z-210403T0100Z/
Corson-Campbell-McPherson-Walworth-Dewey-
1016 AM CDT Fri Apr 2 2021 /916 AM MDT Fri Apr 2 2021/

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT /7 PM MDT/
THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH CENTRAL
SD...

* AFFECTED AREA...In South Dakota, Corson, Campbell, McPherson, 
  Walworth and Dewey.

* WINDS...Northwest 10 to 20 mph with gusts up to 30 mph.

* RELATIVE HUMIDITY...As low as 9 percent.

* IMPACTS...The combination of gusty winds and low relative 
  humidity will produce critical fire weather conditions. Any 
  fires will spread rapidly and become difficult to control and 
  suppress.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity, and warm temperatures can
contribute to extreme fire behavior.

&&

$$

816 
WWUS83 KABR 021611
RFWABR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Aberdeen SD
1111 AM CDT Fri Apr 2 2021

MNZ039-046-SDZ008-020>023-030100-
/O.EXB.KABR.FW.W.0007.210402T1700Z-210403T0100Z/
Traverse-Big Stone-Roberts-Codington-Grant-Hamlin-Deuel-
1111 AM CDT Fri Apr 2 2021

...RED FLAG WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR
WIND AND LOW RELATIVE HUMIDITY FOR NORTHEAST SOUTH DAKOTA AND WEST
CENTRAL MINNESOTA...

The National Weather Service in Aberdeen has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
until 8 PM CDT this evening.

* AFFECTED AREA...In Minnesota, Traverse and Big Stone. In South 
  Dakota, Roberts, Codington, Grant, Hamlin and Deuel.

* WINDS...Southwest 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 20 percent.

* IMPACTS...The combination of gusty winds and low relative 
  humidity will produce critical fire weather conditions. Any 
  fires will spread rapidly and become difficult to control and 
  suppress.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity, and warm temperatures can
contribute to extreme fire behavior.

&&

$$

SDZ003>005-009-015-030100-
/O.CON.KABR.FW.W.0007.210402T1800Z-210403T0100Z/
Corson-Campbell-McPherson-Walworth-Dewey-
1111 AM CDT Fri Apr 2 2021 /1011 AM MDT Fri Apr 2 2021/

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT /7 PM MDT/
THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH CENTRAL
SD...

* AFFECTED AREA...In South Dakota, Corson, Campbell, McPherson, 
  Walworth and Dewey.

* WINDS...Northwest 15 to 25 mph with gusts up to 35 mph.

* RELATIVE HUMIDITY...As low as 9 percent.

* IMPACTS...The combination of gusty winds and low relative 
  humidity will produce critical fire weather conditions. Any 
  fires will spread rapidly and become difficult to control and 
  suppress.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now, or will shortly. A combination of
strong winds, low relative humidity, and warm temperatures can
contribute to extreme fire behavior.

&&

$$

659 
WWUS83 KABR 030101
RFWABR

URGENT - FIRE WEATHER MESSAGE
National Weather Service Aberdeen SD
801 PM CDT Fri Apr 2 2021

MNZ039-046-SDZ003>005-008-009-015-020>023-030215-
/O.EXP.KABR.FW.W.0007.000000T0000Z-210403T0100Z/
Traverse-Big Stone-Corson-Campbell-McPherson-Roberts-Walworth-
Dewey-Codington-Grant-Hamlin-Deuel-
801 PM CDT Fri Apr 2 2021 /701 PM MDT Fri Apr 2 2021/

...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE
HUMIDITY FOR NORTH CENTRAL SD...

Wind speeds have diminished across the area, and relative
humidities will rise through the nighttime hours. Therefore, have
allowed the Red Flag Warning to expire. 

$$

Parkin

Nearby

Red Flag Warnings in South Dakota, 2021 Red Flag Warnings in Minnesota, 2021 Every red flag 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.