580  
FNUS71 KRNK 050319  
FWSRNK  
 
SPOT FORECAST FOR RADFORD ARSENAL AMMONIA RELEASE...PULASKI/MONTGOMERY EM  
NATIONAL WEATHER SERVICE BLACKSBURG VA  
1119 PM EDT TUE SEP 4 2018  
 
FORECAST IS BASED ON FORECAST START TIME OF 0000 EDT ON SEPTEMBER 05.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
GENERALLY EXPECT A LIGHT DRAINAGE WIND OF 2 MPH TO 3 MPH  
FOLLOWING THE NEW RIVER. AMMONIA RELEASE IS EXPECTED TO BE HEAVIER  
THAN AIR, REMAINING CLOSE TO THE GROUND AND FOLLOWING ANY LIGHT  
DRAINAGE WIND DOWN THE RIVER TOWARD BELSPRING. THERE WILL ALSO BE  
AREAS OF FOG DEVELOPING ALONG THE RIVER, LIKELY BECOMING QUITE DENSE  
BETWEEN 4AM AND 8AM, BEFORE GRADUALLY DISSIPATING BETWEEN 9AM AND 11AM.  
THERE WILL ESSENTIALLY BE NO MIXING OR DISPERSION OVERNIGHT. THE  
INVERSION WILL BEGIN TO BREAK 11AM TO NOON WEDNESDAY AND ALLOW FOR  
SOME LIGHT MIXING AND DISPERSION TO BEGIN.  
   
REST OF TONIGHT
 
 
SKY/WEATHER.........BECOMING MOSTLY CLOUDY (55-65 PERCENT) WITH  
AREAS OF FOG DEVELOPING.  
CHANCE OF PCPN......10 PERCENT.  
MIN TEMPERATURE.....AROUND 66.  
MAX HUMIDITY........100 PERCENT.  
SURFACE WINDS.......LIGHT WINDS.  
MIXING WINDS........NORTHEAST 1 TO 2 MPH.  
DISPERSION..........VERY POOR.  
 
TIME (EDT) MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........41 45 48 55 63 66  
WEATHER COV..... PTY PTY  
WEATHER TYPE.... FOG FOG  
TSTM COV........  
CHC OF PCPN (%).10 10 0 0 0 0  
TEMP............72 71 71 69 67 66  
RH..............92 94 96 100 100 100  
SURFACE WND DIR.E E E E E E  
SURFACE WND SPD.0 0 0 0 0 0  
SURFACE WND GST.  
MIXNG WIND DIR..E E E E NE NE  
MIXNG WIND SPD..2 2 2 2 2 1  
DISPERSION......0 0 0 0 0 0  
   
WEDNESDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (45-55 PERCENT). AREAS OF FOG  
EARLY IN THE MORNING. ISOLATED SHOWERS AND  
THUNDERSTORMS LATE IN THE AFTERNOON.  
CHANCE OF PCPN......20 PERCENT.  
MAX TEMPERATURE.....AROUND 87.  
MIN HUMIDITY........58 PERCENT.  
SURFACE WINDS.......LIGHT WINDS.  
MIXING WINDS........BECOMING SOUTHEAST 7 TO 9 MPH IN THE LATE MORNING  
AND AFTERNOON.  
DISPERSION..........FAIR.  
 
TIME (EDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........62 52 40 39 42 40  
WEATHER COV.....AREAS PATCHY  
WEATHER TYPE....FOG FOG NONE NONE NONE NONE  
TSTM COV........  
CHC OF PCPN (%).0 10 10 10 10 10  
TEMP............66 70 76 81 84 85  
RH..............100 96 83 71 61 58  
SURFACE WIND....E 0 E 1 SE 3 SE 5 SE 5 SE 5  
SURFACE WND GST. 6 7 7  
MIXING WIND......NE 1 N 1 E 7 SE 9 SE 7 SE 7  
DISPERSION......0 0 POOR FAIR FAIR FAIR  
 

 
FORECASTER...SPORER  
REQUESTED BY...JOSH TOLBERT/NEAL TURNER  
TYPE OF REQUEST...HAZMAT  
.TAG 1815397.0/RNK  
.DELDT 09/04/18  
 
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