Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 19, NWS Aberdeen, SD
NWS Aberdeen, SD issued this red flag warning at Aug 17, 2021, 2:39 AM CDT for 10 counties in South Dakota. It took effect at Aug 17, 2021, 1:00 PM CDT. It was in force for 7 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
- Aug 17, 2021, 2:39 AM CDT (07:39 UTC)
- In effect from
- Aug 17, 2021, 1:00 PM CDT
- Expired
- Aug 17, 2021, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Aberdeen, SD
Counties Campbell County, SD, Corson County, SD, Dewey County, SD, Hughes County, SD, Jones County, SD, Lyman County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD
The radar
The Aberdeen radar (KABR), 166 km from the middle of the area, began a volume at 07:40 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, 7.7 hours before the alert went out and 154 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
- 2413 J/kg
- Mixed-layer CIN
- -160 J/kg
- Mixed-layer LCL
- 1716 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 181 m²/s²
- 0-3 km storm-relative helicity
- 240 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.0
The text
As transmitted.
990 WWUS83 KABR 170739 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 239 AM CDT Tue Aug 17 2021 SDZ003-004-009-015-016-033>035-045-048-171545- /O.UPG.KABR.FW.A.0009.210817T1800Z-210818T0100Z/ /O.NEW.KABR.FW.W.0019.210817T1800Z-210818T0100Z/ Corson-Campbell-Walworth-Dewey-Potter-Stanley-Sully-Hughes-Jones- Lyman- 239 AM CDT Tue Aug 17 2021 /139 AM MDT Tue Aug 17 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 CENTRAL AND NORTH CENTRAL SOUTH DAKOTA... 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. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In South Dakota, Corson, Campbell, Walworth, Dewey, Potter, Stanley, Sully, Hughes, Jones and Lyman. * WINDS...Southeast 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 18 percent. * IMPACTS...These conditions are supportive of rapid fire growth. 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. && $$ Dorn
2 follow-up statements
774 WWUS83 KABR 171450 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 950 AM CDT Tue Aug 17 2021 SDZ003-004-009-015-016-033>035-045-048-180100- /O.CON.KABR.FW.W.0019.210817T1800Z-210818T0100Z/ Corson-Campbell-Walworth-Dewey-Potter-Stanley-Sully-Hughes-Jones- Lyman- 950 AM CDT Tue Aug 17 2021 /850 AM MDT Tue Aug 17 2021/ ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM CDT /NOON MDT/ THIS AFTERNOON TO 8 PM CDT /7 PM MDT/ THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR CENTRAL AND NORTH CENTRAL SOUTH DAKOTA... * AFFECTED AREA...In South Dakota, Corson, Campbell, Walworth, Dewey, Potter, Stanley, Sully, Hughes, Jones and Lyman. * WINDS...Southeast 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 19 percent. * IMPACTS...These conditions are supportive of rapid fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
761 WWUS83 KABR 180101 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 801 PM CDT Tue Aug 17 2021 SDZ003-004-009-015-016-033>035-045-048-180215- /O.EXP.KABR.FW.W.0019.000000T0000Z-210818T0100Z/ Corson-Campbell-Walworth-Dewey-Potter-Stanley-Sully-Hughes-Jones- Lyman- 801 PM CDT Tue Aug 17 2021 /701 PM MDT Tue Aug 17 2021/ ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR CENTRAL AND NORTH CENTRAL SOUTH DAKOTA... Relative humidity values have begun to rise, and wind speeds will diminish overnight, therefore the Red Flag Warning has been allowed to expire. $$ Parkin
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.