Alert archive / Nebraska / Red Flag Warnings in 2021
Red Flag Warning 5, NWS Omaha, NE
NWS Omaha, NE issued this red flag warning at Mar 31, 2021, 11:57 AM CDT for 8 counties in Nebraska. It took effect at Mar 31, 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
- Mar 31, 2021, 11:57 AM CDT (16:57 UTC)
- In effect from
- Mar 31, 2021, 1:00 PM CDT
- Expired
- Mar 31, 2021, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- NWS Omaha, NE
Counties Boone County, NE, Butler County, NE, Gage County, NE, Jefferson County, NE, Lancaster County, NE, Platte County, NE, Saline County, NE, Seward County, NE
The radar
The Omaha radar (KOAX), 84 km from the middle of the area, began a volume at 17:00 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, 5.0 hours before the alert went out and 84 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
- 2284 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- -199 m²/s²
- 0-3 km storm-relative helicity
- -161 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
383 WWUS83 KOAX 311657 RFWOAX URGENT - FIRE WEATHER MESSAGE National Weather Service Omaha/Valley NE 1157 AM CDT Wed Mar 31 2021 NEZ030-042-050-065-066-078-088-089-010100- /O.NEW.KOAX.FW.W.0005.210331T1800Z-210401T0100Z/ Boone-Platte-Butler-Seward-Lancaster-Saline-Jefferson-Gage- 1157 AM CDT Wed Mar 31 2021 ...RED FLAG WARNING IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EASTERN NEBRASKA... The National Weather Service in Omaha/Valley has issued a Red Flag Warning for wind and low relative humidity, which is in effect until 8 PM CDT this evening. * Affected Area...In Nebraska, Boone, Platte, Butler, Seward, Lancaster, Saline, Jefferson and Gage. * Winds...Northwest 15 to 25 mph with gusts up to 30 mph. * Relative Humidity...As low as 20 percent. * Impacts...Any fires that ignite may spread rapidly and exhibit extreme fire behavior. 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. && $$ DeWald
2 follow-up statements
789 WWUS83 KOAX 312041 RFWOAX URGENT - FIRE WEATHER MESSAGE National Weather Service Omaha/Valley NE 341 PM CDT Wed Mar 31 2021 NEZ030-042-050-065-066-078-088-089-010100- /O.CON.KOAX.FW.W.0005.000000T0000Z-210401T0100Z/ Boone-Platte-Butler-Seward-Lancaster-Saline-Jefferson-Gage- 341 PM CDT Wed Mar 31 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTHEAST NEBRASKA... * Affected Area...In Nebraska, Boone, Platte, Butler, Seward, Lancaster, Saline, Jefferson and Gage. * Winds...Northwest 15 to 25 mph with gusts up to 30 mph. * Relative Humidity...As low as 19 percent. * Impacts...Any fires that ignite may spread rapidly and exhibit extreme fire behavior. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity and warm temperatures can contribute to extreme fire behavior. && $$ DeWald
089 WWUS83 KOAX 010108 RFWOAX URGENT - FIRE WEATHER MESSAGE National Weather Service Omaha/Valley NE 808 PM CDT Wed Mar 31 2021 NEZ030-042-050-065-066-078-088-089-010215- /O.EXP.KOAX.FW.W.0005.000000T0000Z-210401T0100Z/ Boone-Platte-Butler-Seward-Lancaster-Saline-Jefferson-Gage- 808 PM CDT Wed Mar 31 2021 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTHEAST NEBRASKA... With winds decreasing this evening, and cooler temperatures leading to higher humidities, the threat for rapid fire spread and extreme fire behavior have diminished. Thus the Red Flag Warning was allowed to expire at 8 PM. $$
Nearby
Red Flag Warnings in Nebraska, 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.