Alert archive / Nebraska / Red Flag Warnings in 2021
Red Flag Warning 8, NWS Omaha, NE
NWS Omaha, NE issued this red flag warning at May 1, 2021, 10:01 AM CDT for 5 counties in Iowa; 19 counties in Nebraska. It took effect at May 1, 2021, 1:00 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
- May 1, 2021, 10:01 AM CDT (15:01 UTC)
- In effect from
- May 1, 2021, 1:00 PM CDT
- Expired
- May 1, 2021, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Omaha, NE
All 24 counties
Harrison County, IA, Mills County, IA, Monona County, IA, Pottawattamie County, IA, Shelby County, IA, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Lancaster County, NE, Madison County, NE, Platte County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE
The radar
The Omaha radar (KOAX), 27 km from the middle of the area, began a volume at 15:02 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
Omaha, NE (KOAX), launched 12:00Z, 3.0 hours before the alert went out and 27 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
- 2673 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 198 m²/s²
- 0-3 km storm-relative helicity
- 184 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
708 WWUS83 KOAX 011501 RFWOAX URGENT - FIRE WEATHER MESSAGE National Weather Service Omaha/Valley NE 1001 AM CDT Sat May 1 2021 IAZ043-055-056-069-079-NEZ015-018-030>034-042>045-050>053-065>067- 078-020000- /O.NEW.KOAX.FW.W.0008.210501T1800Z-210502T0000Z/ Monona-Harrison-Shelby-Pottawattamie-Mills-Thurston-Wayne-Boone- Madison-Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler- Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Saline- 1001 AM CDT Sat May 1 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EASTERN NEBRASKA AND SOUTHWEST IOWA... The National Weather Service in Omaha/Valley has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 1 PM this afternoon to 7 PM CDT this evening. * Affected Area...In Iowa, Monona, Harrison, Shelby, Pottawattamie and Mills. In Nebraska, Thurston, Wayne, Boone, Madison, Stanton, Cuming, Burt, Platte, Colfax, Dodge, Washington, Butler, Saunders, Douglas, Sarpy, Seward, Lancaster, Cass and Saline. * Winds...Southwest 20 to 25 mph with gusts up to 40 mph. * Relative Humidity...As low as 20 percent. * Impacts...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. 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. && $$
2 follow-up statements
213 WWUS83 KOAX 012342 RFWOAX URGENT - FIRE WEATHER MESSAGE National Weather Service Omaha/Valley NE 642 PM CDT Sat May 1 2021 IAZ043-055-056-069-079-NEZ015-018-030>034-042>045-050>053-065>067- 078-020100- /O.EXT.KOAX.FW.W.0008.000000T0000Z-210502T0100Z/ Monona-Harrison-Shelby-Pottawattamie-Mills-Thurston-Wayne-Boone- Madison-Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler- Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Saline- 642 PM CDT Sat May 1 2021 ...RED FLAG WARNING NOW IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EASTERN NEBRASKA AND SOUTHWEST IOWA... * Affected Area...In Iowa, Monona, Harrison, Shelby, Pottawattamie and Mills. In Nebraska, Thurston, Wayne, Boone, Madison, Stanton, Cuming, Burt, Platte, Colfax, Dodge, Washington, Butler, Saunders, Douglas, Sarpy, Seward, Lancaster, Cass and Saline. * Winds...Southwest 20 to 25 mph with gusts up to 35 mph. * Relative Humidity...As low as 16 percent. * Impacts...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity and warm temperatures can contribute to extreme fire behavior. && $$
103 WWUS83 KOAX 020055 RFWOAX URGENT - FIRE WEATHER MESSAGE National Weather Service Omaha/Valley NE 755 PM CDT Sat May 1 2021 IAZ043-055-056-069-079-NEZ015-018-030>034-042>045-050>053-065>067- 078-020200- /O.EXP.KOAX.FW.W.0008.000000T0000Z-210502T0100Z/ Monona-Harrison-Shelby-Pottawattamie-Mills-Thurston-Wayne-Boone- Madison-Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler- Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Saline- 755 PM CDT Sat May 1 2021 ...RED FLAG WARNING WILL EXPIRE AT 8 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EASTERN NEBRASKA AND SOUTHWEST IOWA... Winds are not as strong as they were earlier today and relative humidity values have increased. The Red Flag Warning which was in effect will be allowed to expire at 8 pm. $$ BCM
Nearby
Red Flag Warnings in Nebraska, 2021Red Flag Warnings in Iowa, 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.