Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 21, NWS Aberdeen, SD
NWS Aberdeen, SD issued this red flag warning at Sep 18, 2021, 8:26 AM MDT for 4 counties in South Dakota. It took effect at Sep 18, 2021, 11:00 AM MDT. 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
- Sep 18, 2021, 8:26 AM MDT (14:26 UTC)
- In effect from
- Sep 18, 2021, 11:00 AM MDT
- Expired
- Sep 18, 2021, 7:00 PM MDT
- In force
- 8 hr
- Issued by
- NWS Aberdeen, SD
Counties Corson County, SD, Dewey County, SD, Jones County, SD, Stanley County, SD
The radar
The Rapid City radar (KUDX), 173 km from the middle of the area, began a volume at 14:29 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
Rapid City, SD (KUNR), launched 12:00Z, 2.4 hours before the alert went out and 179 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
- 3699 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
143 WWUS83 KABR 181426 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 926 AM CDT Sat Sep 18 2021 SDZ003-015-033-045-182230- /O.NEW.KABR.FW.W.0021.210918T1700Z-210919T0100Z/ Corson-Dewey-Stanley-Jones- 926 AM CDT Sat Sep 18 2021 /826 AM MDT Sat Sep 18 2021/ ...RED FLAG WARNING IN EFFECT UNTIL 8 PM CDT /7 PM MDT/ THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF 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 until 8 PM CDT /7 PM MDT/ this evening. * AFFECTED AREA...In South Dakota, Corson, Dewey, Stanley and Jones. * WINDS...South 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 17 percent. * IMPACTS...The combination of gusty winds and low relative humidity will be supportive of rapid fire growth. Any fires will 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. && $$
1 follow-up statement
849 WWUS83 KABR 182133 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 433 PM CDT Sat Sep 18 2021 SDZ003-015-033-045-190100- /O.CON.KABR.FW.W.0021.000000T0000Z-210919T0100Z/ Corson-Dewey-Stanley-Jones- 433 PM CDT Sat Sep 18 2021 /333 PM MDT Sat Sep 18 2021/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT /7 PM MDT/ THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF CENTRAL AND NORTH CENTRAL SOUTH DAKOTA... * AFFECTED AREA...In South Dakota, Corson, Dewey, Stanley and Jones. * WINDS...South 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 18 percent. * IMPACTS...The combination of gusty winds and low relative humidity will be supportive of rapid fire growth. Any fires will become difficult to control and suppress. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ Mohr
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.