Alert archive / Minnesota / Red Flag Warnings in 2021
Red Flag Warning 1, NWS Duluth, MN
NWS Duluth, MN issued this red flag warning at Mar 20, 2021, 5:37 AM CDT for Carlton County, Pine County, Saint Louis County, Minnesota. It took effect at Mar 20, 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
- Mar 20, 2021, 5:37 AM CDT (10:37 UTC)
- In effect from
- Mar 20, 2021, 12:00 PM CDT
- Expired
- Mar 20, 2021, 7:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Duluth, MN
Counties Carlton County, MN, Pine County, MN, Saint Louis County, MN
The radar
The Duluth radar (KDLH), 33 km from the middle of the area, began a volume at 10:41 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
International Fa, MN (KINL), launched 00:00Z, 10.6 hours before the alert went out and 207 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
- 2779 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
938 WWUS83 KDLH 201037 RFWDLH URGENT - FIRE WEATHER MESSAGE National Weather Service Duluth MN 537 AM CDT Sat Mar 20 2021 ...LOW RH AND GUSTY WINDS TO LEAD TO CRITICAL FIRE WEATHER CONDITIONS SATURDAY... .An area of very dry air accompanied by gusty winds may lead to critical fire weather conditions Saturday. Dew points aloft are near -50C which is very abnormal for an air mass. An inversion will keep most of this dry air from mixing down, but if a fire does develop and break the inversion it could rapidly grow. MNZ011-019-035-036-201145- /O.CAN.KDLH.FW.A.0001.210320T1700Z-210320T2300Z/ North St. Louis-Central St. Louis-Northern Aitkin-South Aitkin- 537 AM CDT Sat Mar 20 2021 ...FIRE WEATHER WATCH IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF NORTHERN MINNESOTA... The National Weather Service in Duluth has cancelled the Fire Weather Watch. Fire weather conditions will be near-critical today, with minimum RH values between 20 and 30 percent along with wind gusts from 30 to 40 mph. The lowest minimum RH values are expected to be in east-central Minnsota. Areas without snow pack will see the greatest risk for hazardous fire weather conditions. $$ MNZ037-038-201845- /O.UPG.KDLH.FW.A.0001.210320T1700Z-210320T2300Z/ /O.NEW.KDLH.FW.W.0001.210320T1700Z-210321T0000Z/ Carlton and South St. Louis-Pine- 537 AM CDT Sat Mar 20 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 7 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR EAST CENTRAL MINNESOTA... The National Weather Service in Duluth has issued a Red Flag Warning for wind and low relative humidity, which is in effect from noon today to 7 PM CDT this evening. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In Minnesota, Carlton and South St. Louis and Pine. * WINDS...South 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 24 percent. * IMPACTS...Rapid fire growth is possible especially with the strong winds and low relative humidities not too far above the surface. If a fire were to break through this inversion, it could exacerbate the spread potential and fire intensities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
2 follow-up statements
439 WWUS83 KDLH 202139 RFWDLH URGENT - FIRE WEATHER MESSAGE National Weather Service Duluth MN 439 PM CDT Sat Mar 20 2021 ...NEAR CRITICAL FIRE WEATHER CONDITIONS CONTINUE THIS AFTERNOON... .Near critical fire weather conditions will continue this afternoon due to very dry air with relative humidity values around 20 to 25% and winds gusting as high as 30 mph. Conditions will improve after sunset this evening. MNZ037-038-210000- /O.CON.KDLH.FW.W.0001.000000T0000Z-210321T0000Z/ Carlton and South St. Louis-Pine- 439 PM CDT Sat Mar 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR ... * AFFECTED AREA...In Minnesota, Carlton and South St. Louis and Pine. * WINDS...South from 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 20 percent. * IMPACTS...Rapid fire growth is possible especially with the strong winds and low relative humidities not too far above the surface. If a fire were to break through this inversion, it could exacerbate the spread potential and fire intensities. 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. && $$
410 WWUS83 KDLH 210001 RFWDLH URGENT - FIRE WEATHER MESSAGE National Weather Service Duluth MN 701 PM CDT Sat Mar 20 2021 MNZ037-038-210115- /O.EXP.KDLH.FW.W.0001.000000T0000Z-210321T0000Z/ Carlton and South St. Louis-Pine- 701 PM CDT Sat Mar 20 2021 ...RED FLAG WARNING HAS EXPIRED.. The humidity will slowly rise this evening and the wind will remain gusty but be weaker than this afternoon for most areas. $$ Melde
The office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 4:22 AM CDT | Small Craft Advisory | DLH | 41 hr |
Nearby
Red Flag Warnings in Minnesota, 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.