Pennington County, SD
Alerts
Alerts are listed in order of start time and level of severity. Click on the alert title to read details for each alert.
In effect from Monday 04/20 11:00 AM MDT – Monday 04/20 8:00 PM MDT
Issued by NWS Rapid City SD
3 DAYS OF NEAR-CRITICAL TO CRITICAL FIRE WEATHER CONDITIONS EXPECTED ACROSS NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA MONDAY THROUGH WEDNESDAY
.High pressure building into the region will support a strong warming and drying trend across northeastern Wyoming and western South Dakota today through Wednesday. Daily afternoon relative humidity values will drop into the 8 to 20 percent range by Monday and stay there each afternoon through Wednesday, while temperatures gradually warm into the 80s to near 90. Winds will be more marginal and somewhat of a limiting factor at times for meeting formal critical fire weather thresholds, but gusts of at least 25 MPH will likely overlap with these dry humidity values in some areas each day, with much stronger winds regionwide Wednesday. The combination of dry fuels, low relative humidities, gusty winds, and hot temperatures will support widespread near- critical to critical fire weather conditions, with multiple Red Flag Warnings possible over the period. The first warning has been issued for portions of northeastern Wyoming and the southwestern and south-central South Dakota plains for Monday.
The National Weather Service in Rapid City has issued a Red Flag Warning for gusty winds and low relative humidity, which is in effect from 11 AM MDT /noon CDT/ to 8 PM MDT /9 PM CDT/ Monday.
Affected Area
Fire Weather Zones 315 Southern Campbell, 317 Weston County Plains, 321 Southern Black Hills, 322 Fall River County Area, 325 Custer County Plains, 326 Pine Ridge Area, 332 Badlands Area, 333 Bennett County Area, 334 Mellette and Todd Counties, and 335 Tripp County.
Winds
West 10 to 20 MPH with gusts up to 30 MPH.
Relative Humidity
As low as 9 percent.
Impacts
The combination of dry fuels, low relative humidities, gusty winds, and hot temperatures will produce critical fire weather conditions. New fires could spread rapidly.
What to do
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.
Areas impacted
- Southern Black Hills
- Fall River County Area
- Custer County Plains
- Pine Ridge Area
- Badlands Area
- Bennett County Area
- Mellette and Todd Counties
- Tripp County
- Southern Campbell
- Weston County Plains
Briefing
From the forecaster
Strong Warming Trend through Mid-Week
Created by the NWS Rapid City WFO
Temperatures will be mild tonight, then will rebound to near record temperatures over the next few days. Sunny, dry, and windy weather will create widespread near-critical to critical fire weather. Be careful when doing outdoor chores or activities, don't be an ignition source!
Seven-day weather risk overview
Daily weather risk summary
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