298  
FNUS71 KPBZ 191523  
FWSPBZ  
 
SPOT FORECAST FOR IZENBROWN - UNIT 1 RX...ALLEGHENY N.F.  
NATIONAL WEATHER SERVICE PITTSBURGH PA  
1123 AM EDT MON APR 19 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 1200 EDT ON APRIL 19.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE AT (412) 262-1485, IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
 
MOSTLY DRY WEATHER WILL CONTINUE THROUGH TONIGHT, ALTHOUGH THERE IS  
A SLIGHT CHANCE OF A SHOWER LATE TONIGHT/TUESDAY MORNING. MINIMUM  
RH LEVELS OF 30 TO 35 PERCENT ARE EXPECTED THIS AFTERNOON, WITH A  
SOUTHWEST BREEZE BECOMING LIGHT THIS EVENING. RH WILL BE A BIT HIGHER  
ON TUESDAY.  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (40-50 PERCENT).  
CHANCE OF PCPN......10 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 64.  
MIN HUMIDITY........31 PERCENT.  
WIND (20 FT)........SOUTHWEST WINDS 5 TO 7 MPH.  
MIXING HEIGHT.......11300 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 13 TO 15 MPH.  
HAINES INDEX........5 TO 6 OR MODERATE TO HIGH POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
LVORI...............1.  
ADI.................78.  
 
TIME (EDT) 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........39 48 53 54 53 53  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).10 10 10 10 10 10  
LAL.............1 1 1 1 1 1  
TEMP............60 61 62 63 64 64  
RH..............42 37 34 32 31 32  
20 FT WIND DIR..SW SW SW SW SW SW  
20 FT WIND SPD..5 6 6 6 6 7  
20 FT WIND GUST.10 10 11 12 13 14  
MIX HGT (KFT)...9.8 11 11 11 11 9.4  
TRANSP WIND DIR.W W W W W SW  
TRANSP WIND SPD.13 13 14 15 15 15  
LVORI...........1 1 1 1 1 1  
ADI.............77 77 77 79 79 79  
HAINES INDEX....6 6 5 5 5 5  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). SLIGHT CHANCE OF  
RAIN SHOWERS OVERNIGHT.  
CHANCE OF PCPN......20 PERCENT.  
LAL.................NO TSTMS.  
MIN TEMPERATURE.....AROUND 39.  
MAX HUMIDITY........84 PERCENT.  
WIND (20 FT)........SOUTHWEST WINDS 5 TO 7 MPH EARLY IN THE EVENING  
BECOMING LIGHT.  
MIXING HEIGHT.......0 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 7 TO 14 MPH.  
HAINES INDEX........2 TO 5 OR VERY LOW TO MODERATE POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
LVORI...............4.  
ADI.................18 DECREASING TO 6 IN THE LATE EVENING AND  
OVERNIGHT.  
 
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........50 51 48 46 57 66 62 47 51 58 63 67  
WEATHER COV..... SCH SCH SCH SCH  
WEATHER TYPE.... RW RW RW RW  
TSTM COV........  
CHC OF PCPN (%).10 10 10 10 10 10 10 10 20 20 20 20  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............63 62 57 54 53 51 50 48 46 44 43 42  
RH..............34 37 45 51 55 59 63 69 74 78 82 84  
20 FT WIND DIR..SW SW SW SW SW W W W W W W W  
20 FT WIND SPD..6 6 5 5 5 6 5 4 3 3 3 3  
20 FT WIND GUST.14 13 10 10 11 13 7 6 5 5 5 5  
MIX HGT (KFT)...6.6 3.2 0.6 0.1 0.1 0.5 0.7 0.9 1.1 1.3 1.3 1.4  
TRANSP WIND DIR.SW SW SW SW SW SW SW W W W W NW  
TRANSP WIND SPD.14 12 10 10 10 10 9 8 7 7 8 9  
LVORI...........2 2 2 2 3 3 3 3 3 4 5 5  
ADI.............18 18 18 7 7 7 4 4 4 4 4 4  
HAINES INDEX....5 5 5 5 5 3 3 3 3 3 3 2  
   
TUESDAY
 
 
SKY/WEATHER.........PARTLY SUNNY (65-75 PERCENT). SLIGHT CHANCE OF  
RAIN SHOWERS EARLY IN THE MORNING. SLIGHT  
CHANCE OF SNOW SHOWERS EARLY IN THE MORNING.  
CHANCE OF PCPN......20 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 52.  
MIN HUMIDITY........50 PERCENT.  
WIND (20 FT)........LIGHT WINDS BECOMING WEST AROUND 5 MPH IN THE  
LATE MORNING AND AFTERNOON, THEN BECOMING LIGHT  
LATE IN THE AFTERNOON.  
MIXING HEIGHT.......1900 FT AGL.  
TRANSPORT WINDS.....NORTH 2 TO 9 MPH.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
LVORI...............3.  
ADI.................16 DECREASING TO 10 IN THE AFTERNOON.  
 
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........69 71 68 70 70 74 71 74 76 71 66 60  
WEATHER COV.....SCH SCH  
WEATHER TYPE....RW RS  
TSTM COV........  
CHC OF PCPN (%).20 20 10 10 10 10 10 10 10 10 10 10  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............41 39 40 41 44 46 48 49 49 51 52 52  
RH..............85 88 84 81 75 69 63 59 55 52 50 50  
20 FT WIND DIR..W W W W W W W W W W NW NW  
20 FT WIND SPD..2 3 3 4 5 5 5 5 5 5 5 4  
20 FT WIND GUST.4 5  
MIX HGT (KFT)...1.4 1.4 1.5 1.6 1.8 1.9 1.9 1.8 1.7 1.7 1.7 1.5  
TRANSP WIND DIR.NW NW NW NW NW NW NW N NE NE N N  
TRANSP WIND SPD.9 9 9 8 7 6 5 3 2 3 5 6  
LVORI...........4 4 4 4 4 3 3 3 3 2 2 2  
ADI.............18 18 18 14 14 14 8 8 8 11 11 11  
HAINES INDEX....2 2 2 2 2 2 2 2 2 2 2 2  
 

 
FORECASTER...CL  
REQUESTED BY...KRISTEN FURIE  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2109617.0/PBZ  
.DELDT 04/19/21  
.FORMATTERVERSION 1.0.26  
.EMAIL PAMACC@FIRENET.GOV  
 
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