Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 18, NWS Aberdeen, SD
NWS Aberdeen, SD issued this red flag warning at Aug 10, 2021, 3:28 AM CDT for 10 counties in South Dakota. It took effect at Aug 10, 2021, 2:00 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
- Aug 10, 2021, 3:28 AM CDT (08:28 UTC)
- In effect from
- Aug 10, 2021, 2:00 PM CDT
- Expired
- Aug 10, 2021, 8:00 PM CDT
- In force
- 6 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 08:30 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, 8.5 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
- 2363 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 1628 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 136 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 14.4
The text
As transmitted.
294 WWUS83 KABR 100828 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 328 AM CDT Tue Aug 10 2021 SDZ036-100930- /O.CAN.KABR.FW.A.0008.210810T1900Z-210811T0100Z/ Hyde- 328 AM CDT Tue Aug 10 2021 ...FIRE WEATHER WATCH IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF CENTRAL AND NORTH CENTRAL SOUTH DAKOTA... The National Weather Service in Aberdeen has cancelled the Fire Weather Watch. $$ SDZ003-015-016-033>035-102000- /O.UPG.KABR.FW.A.0008.210810T1900Z-210811T0100Z/ /O.NEW.KABR.FW.W.0018.210810T1900Z-210811T0100Z/ Corson-Dewey-Potter-Stanley-Sully-Hughes- 328 AM CDT Tue Aug 10 2021 /228 AM MDT Tue Aug 10 2021/ ...RED FLAG WARNING IN EFFECT FROM 2 PM CDT /1 PM MDT/ THIS AFTERNOON TO 8 PM CDT /7 PM MDT/ THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR CENTRAL AND NORTH CENTRAL SOUTH DAKOTA... The National Weather Service in Aberdeen has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 2 PM CDT /1 PM MDT/ this afternoon to 8 PM CDT /7 PM MDT/ this evening. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In South Dakota, Corson, Dewey, Potter, Stanley, Sully and Hughes. * WINDS...West 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 17 percent. * IMPACTS...These conditions are supportive of rapid fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ SDZ004-009-045-048-102000- /O.NEW.KABR.FW.W.0018.210810T1900Z-210811T0100Z/ Campbell-Walworth-Jones-Lyman- 328 AM CDT Tue Aug 10 2021 ...RED FLAG WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 8 PM CDT 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 2 PM this afternoon to 8 PM CDT this evening. * AFFECTED AREA...In South Dakota, Campbell, Walworth, Jones and Lyman. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 20 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. && $$ Parkin
2 follow-up statements
527 WWUS83 KABR 101713 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 1213 PM CDT Tue Aug 10 2021 SDZ003-004-009-015-016-033>035-045-048-110100- /O.CON.KABR.FW.W.0018.210810T1900Z-210811T0100Z/ Corson-Campbell-Walworth-Dewey-Potter-Stanley-Sully-Hughes-Jones- Lyman- 1213 PM CDT Tue Aug 10 2021 /1113 AM MDT Tue Aug 10 2021/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT /7 PM MDT/ THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR CENTRAL AND NORTH CENTRAL SOUTH DAKOTA... * AFFECTED AREA...In South Dakota, Corson, Campbell, Walworth, Dewey, Potter, Stanley, Sully, Hughes, Jones and Lyman. * WINDS...Southwest 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...These conditions are supportive of rapid fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
160 WWUS83 KABR 110053 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 753 PM CDT Tue Aug 10 2021 SDZ003-004-009-015-016-033>035-045-048-110200- /O.EXP.KABR.FW.W.0018.000000T0000Z-210811T0100Z/ Corson-Campbell-Walworth-Dewey-Potter-Stanley-Sully-Hughes-Jones- Lyman- 753 PM CDT Tue Aug 10 2021 /653 PM MDT Tue Aug 10 2021/ ...RED FLAG WARNING WILL EXPIRE AT 8 PM CDT /7 PM MDT/ THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR CENTRAL AND NORTH CENTRAL SOUTH DAKOTA... As the air cools this evening, the relative humidity will climb. The wind will also diminish with the setting sun, 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.