311  
FNUS73 KUNR 010034  
FWSUNR  
 
SPOT FORECAST FOR FIR...BIA  
NATIONAL WEATHER SERVICE RAPID CITY SD  
634 PM MDT FRI SEP 30 2022  
 
FORECAST IS BASED ON FORECAST START TIME OF 1900 MDT ON SEPTEMBER 30.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
WINDS WILL GENERALLY BE WESTERLY EARLY THIS EVENING, WITH A  
WEAK FRONTAL BOUNDARY EXPECTED TO SWITCH WINDS TO THE NORTHWEST CLOSE TO  
9 PM. MAIN CHANCES FOR SHOWERS AND POSSIBLY A THUNDERSTORM WILL BE LATER  
THIS EVENING AND INTO THE OVERNIGHT HOURS. CHANCE FOR WETTING RAIN  
LOOKS FAIRLY LOW. HOWEVER, HUMIDITY RECOVERY LATE TONIGHT SHOULD BE  
EXCELLENT. SATURDAY WILL BE COOLER, WITH HIGHER HUMIDITIES. WINDS SHOULD STAY  
NORTH TO NORTHWEST THROUGH THE DAY.  
   
REST OF TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. A CHANCE OF SHOWERS AND SLIGHT  
CHANCE OF THUNDERSTORMS, MAINLY BETWEEN 8 PM AND 2 AM.  
MIN TEMPERATURE.....AROUND 52.  
MAX HUMIDITY........90-95 PERCENT.  
WIND (20 FT)........WEST WINDS 5 TO 10 MPH WITH GUSTS TO 15 MPH EARLY THIS  
EVENING BECOMING NORTHWEST 10 TO 15 MPH WITH GUSTS TO  
AROUND 20 MPH BETWEEN 8 PM AND 9 PM. NORTHWEST WINDS  
DECREASE TO 5 TO 10 MPH AFTER MIDNIGHT. GUSTY AND  
ERRATIC WINDS POSSIBLE NEAR ANY THUNDERSTORMS.  
CWR.................20 PERCENT.  
LAL.................2.  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......400 TO 900 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 15 TO 20 MPH.  
SMOKE DISPERSAL.....POOR.  
   
SATURDAY
 
 
SKY/WEATHER.........PARTLY SUNNY.  
MAX TEMPERATURE.....AROUND 73.  
MIN HUMIDITY........38-42 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 6 TO 12 MPH BECOMING NORTH EARLY IN THE  
AFTERNOON. GUSTS TO AROUND 18 MPH IN THE LATE MORNING  
AND AFTERNOON.  
CWR.................0 PERCENT.  
LAL.................1.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......3900 TO 4400 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 15 TO 20 MPH.  
SMOKE DISPERSAL.....FAIR.  
   
SATURDAY NIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF THUNDERSTORMS IN THE  
EVENING. CHANCE OF SHOWERS THROUGH THE NIGHT.  
MIN TEMPERATURE.....AROUND 49.  
MAX HUMIDITY........95-100 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 6 TO 12 MPH SHIFTING TO THE  
SOUTHWEST OVERNIGHT. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR ANY THUNDERSTORMS IN THE EVENING.  
CWR.................20 PERCENT.  
LAL.................2 UNTIL 2400, THEN 1.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......400 TO 900 FT AGL.  
TRANSPORT WINDS.....NORTH AROUND 15 MPH SHIFTING TO THE WEST  
OVERNIGHT.  
SMOKE DISPERSAL.....POOR.  
 

 
FORECASTER...ST  
REQUESTED BY...MEGAN JAROS  
TYPE OF REQUEST...WILDFIRE  
.TAG 2218915.0/UNR  
.DELDT 09/30/22  
.FORMATTERVERSION 2.0.0  
.EMAIL MARJOE.JANIS@BIA.GOV  
 
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