Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 9, NWS Aberdeen, SD
NWS Aberdeen, SD issued this red flag warning at Apr 4, 2021, 3:54 AM CDT for 6 counties in South Dakota. It took effect at Apr 4, 2021, 1:00 PM CDT. It was in force for 6 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 4, 2021, 3:54 AM CDT (08:54 UTC)
- In effect from
- Apr 4, 2021, 1:00 PM CDT
- Expired
- Apr 4, 2021, 7:00 PM CDT
- In force
- 6 hr
- Issued by
- NWS Aberdeen, SD
Counties Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, McPherson County, SD, Walworth County, SD
The radar
The Aberdeen radar (KABR), 132 km from the middle of the area, began a volume at 08:55 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 8.9 hours before the alert went out and 144 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
- 4012 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
807 WWUS83 KABR 040854 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 354 AM CDT Sun Apr 4 2021 SDZ003>005-009-010-015-041700- /O.NEW.KABR.FW.W.0009.210404T1800Z-210405T0000Z/ Corson-Campbell-McPherson-Walworth-Edmunds-Dewey- 354 AM CDT Sun Apr 4 2021 /254 AM MDT Sun Apr 4 2021/ ...RED FLAG WARNING IN EFFECT FROM 1 PM CDT /NOON MDT/ THIS AFTERNOON TO 7 PM CDT /6 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 7 PM CDT /6 PM MDT/ this evening. * AFFECTED AREA...In South Dakota, Corson, Campbell, McPherson, Walworth, Edmunds and Dewey. * WINDS...Southeast 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 12 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. && $$
2 follow-up statements
830 WWUS83 KABR 041606 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 1106 AM CDT Sun Apr 4 2021 SDZ003>005-009-010-015-050000- /O.CON.KABR.FW.W.0009.210404T1800Z-210405T0000Z/ Corson-Campbell-McPherson-Walworth-Edmunds-Dewey- 1106 AM CDT Sun Apr 4 2021 /1006 AM MDT Sun Apr 4 2021/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM CDT /6 PM MDT/ THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH CENTRAL SD... * AFFECTED AREA...In South Dakota, Corson, Campbell, McPherson, Walworth, Edmunds and Dewey. * WINDS...Southeast 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...10 to 20 percent. * IMPACTS...The combination of gusty winds and low relative humidity will produce critical fire weather conditions. Any fires will spread rapidly and become difficult to control and suppress. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ TMT
225 WWUS83 KABR 042358 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 658 PM CDT Sun Apr 4 2021 SDZ003>005-009-010-015-050100- /O.EXP.KABR.FW.W.0009.000000T0000Z-210405T0000Z/ Corson-Campbell-McPherson-Walworth-Edmunds-Dewey- 658 PM CDT Sun Apr 4 2021 /558 PM MDT Sun Apr 4 2021/ ...RED FLAG WARNING WILL EXPIRE AT 7 PM CDT /6 PM MDT/ THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH CENTRAL SD... As the temperatures cool, the relative humidity will rise across the area, thus the Red Flag Warning will be allowed to expire. $$
Nearby
Red Flag Warnings in South Dakota, 2021Every 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.