Alert archive / South Dakota / Red Flag Warnings in 2021
Red Flag Warning 12, NWS Aberdeen, SD
NWS Aberdeen, SD issued this red flag warning at Apr 22, 2021, 11:30 AM CDT for 6 counties in South Dakota. It took effect at Apr 22, 2021, 12:00 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
- Apr 22, 2021, 11:30 AM CDT (16:30 UTC)
- In effect from
- Apr 22, 2021, 12:00 PM CDT
- Expired
- Apr 22, 2021, 6:40 PM CDT
- In force
- 7 hr
- Issued by
- NWS Aberdeen, SD
Counties Brown County, SD, Codington County, SD, Day County, SD, Grant County, SD, Marshall County, SD, Roberts County, SD
The radar
The Aberdeen radar (KABR), 78 km from the middle of the area, began a volume at 16:28 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 12:00Z, 4.5 hours before the alert went out and 97 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
- 2018 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- -41 m²/s²
- 0-3 km storm-relative helicity
- -14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
820 WWUS83 KABR 221630 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 1130 AM CDT Thu Apr 22 2021 SDZ007-008-011-020-021-230000- /O.NEW.KABR.FW.W.0012.210422T1700Z-210423T0000Z/ Marshall-Roberts-Day-Codington-Grant- 1130 AM CDT Thu Apr 22 2021 ...RED FLAG WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHEAST SD... The National Weather Service in Aberdeen has issued a Red Flag Warning for wind and low relative humidity, which is in effect until 7 PM CDT this evening. * AFFECTED AREA...In South Dakota, Marshall, Roberts, Day, Codington and Grant. * WINDS...Southwest 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 20 percent. 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. && $$
2 follow-up statements
660 WWUS83 KABR 221733 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 1233 PM CDT Thu Apr 22 2021 SDZ006-230000- /O.EXA.KABR.FW.W.0012.000000T0000Z-210423T0000Z/ Brown- 1233 PM CDT Thu Apr 22 2021 ...RED FLAG WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHEAST SOUTH DAKOTA... The National Weather Service in Aberdeen has issued a Red Flag Warning for wind and low relative humidity, which is in effect until 7 PM CDT this evening. * AFFECTED AREA...In South Dakota, Brown. * WINDS...South 15 to 25 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 15 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ SDZ007-008-011-020-021-230000- /O.CON.KABR.FW.W.0012.000000T0000Z-210423T0000Z/ Marshall-Roberts-Day-Codington-Grant- 1233 PM CDT Thu Apr 22 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHEAST SD... * AFFECTED AREA...In South Dakota, Marshall, Roberts, Day, Codington and Grant. * WINDS...Southwest 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 20 percent. 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. && $$
754 WWUS83 KABR 222340 RFWABR URGENT - FIRE WEATHER MESSAGE National Weather Service Aberdeen SD 640 PM CDT Thu Apr 22 2021 SDZ006>008-011-020-021-230045- /O.CAN.KABR.FW.W.0012.000000T0000Z-210423T0000Z/ Brown-Marshall-Roberts-Day-Codington-Grant- 640 PM CDT Thu Apr 22 2021 ...RED FLAG WARNING IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHEAST SD... The relative humidity has increased across the region. Therefore, the Red Flag Warning has been cancelled. $$ 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.