Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 11, NWS Aberdeen, SD
NWS Aberdeen, SD issued this red flag warning at Apr 9, 2021, 2:48 AM MDT for Corson County, Dewey County, South Dakota. It took effect at Apr 9, 2021, 1:00 PM MDT. 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
- Apr 9, 2021, 2:48 AM MDT (08:48 UTC)
- In effect from
- Apr 9, 2021, 1:00 PM MDT
- Expired
- Apr 9, 2021, 8:00 PM MDT
- In force
- 7 hr
- Issued by
- NWS Aberdeen, SD
Counties Corson County, SD, Dewey County, SD
The radar
The Bismarck radar (KBIS), 150 km from the middle of the area, began a volume at 08:48 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, 8.8 hours before the alert went out and 151 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
- 3004 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- -8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
480 WWUS83 KABR 090848 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 348 AM CDT Fri Apr 9 2021 SDZ003-015-091700- /O.NEW.KABR.FW.W.0011.210409T1900Z-210410T0100Z/ Corson-Dewey- 248 AM MDT Fri Apr 9 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR 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 this afternoon to 7 PM MDT this evening. * AFFECTED AREA...In South Dakota, Corson and Dewey. * WINDS...Northwest 25 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...15 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. && $$ SD
3 follow-up statements
327 WWUS83 KABR 091631 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 1131 AM CDT Fri Apr 9 2021 SDZ003-015-100100- /O.CON.KABR.FW.W.0011.210409T1900Z-210410T0100Z/ Corson-Dewey- 1031 AM MDT Fri Apr 9 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH CENTRAL SOUTH DAKOTA... * AFFECTED AREA...In South Dakota, Corson and Dewey. * WINDS...Northwest 25 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...15 to 20 percent. * IMPACTS...The combination of gusty winds and low relative humidity will produce critical fire weather conditions. Any fires will spread rapidly and become difficult to control and suppress. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ Parkin
033 WWUS83 KABR 100058 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 758 PM CDT Fri Apr 9 2021 SDZ003-015-100200- /O.EXT.KABR.FW.W.0011.000000T0000Z-210410T0200Z/ Corson-Dewey- 658 PM MDT Fri Apr 9 2021 ...RED FLAG WARNING NOW IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH CENTRAL SOUTH DAKOTA... * AFFECTED AREA...In South Dakota, Corson and Dewey. * WINDS...Northwest 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 13 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. && $$ Dorn
430 WWUS83 KABR 100216 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 916 PM CDT Fri Apr 9 2021 SDZ003-015-100330- /O.EXP.KABR.FW.W.0011.000000T0000Z-210410T0200Z/ Corson-Dewey- 816 PM MDT Fri Apr 9 2021 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH CENTRAL SOUTH DAKOTA... Red flag conditions are no longer occurring across the area. $$ Dorn
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.