Roanoke Air Quality data for the Summer 2000 season
From May 8, 2000 - Sept. 8, 2000 (124 days)

NOTE: Data for 2000 has not been through the validation process by environmental agencies.
Based on daily readings as reported via EPA and VA DEQ websites. Below data was reviewed by VA DEQ.
-----------------------------------

1 Hour Peak ranges (standard 124 parts per billion (ppb))

0 - 60 ppb - 63 days
61 - 79 ppb - 49 days
80 - 99 ppb - 10 days
111 - 124 ppb - 1 day (June 10, 2000)
125+ ppb - 0 days
NA - 1 day (June 23, 2000)

In 2000, Roanoke had 0 occasions when the 1 Hour peak exceeded the 124 ppb standard.

**June 8, 2000 was not a valid sampling day, since there were less than 75% of the hours
from 9 am to 9 pm EST available for the day. The 1-hour peak for that day was 0.075
ppm (75 ppb))

8 Hour Peak ranges (standard 85 ppb)

(GREEN) GOOD - 94 days
(YELLOW) MODERATE - 27 days
(ORANGE) Unhealthy for Sensitive people - 2 days (June 9,10 , 2000)
(RED) Unhealthy - 0 days
(PURPLE) Very Unhealthy - 0 days
NA - 1

8 Hour Air Quality Index / Ozone Concentration (parts per million - ppm) conversion
GREEN = AQI of 1 - 50 = Ozone Con. 0.001 - 0.064 ppm
YELLOW = AQI of 51 - 100 = Ozone Con. 0.065 - 0.084 ppm
ORANGE = AQI of 101 - 150 = Ozone Con. 0.085 - 0.104 ppm
RED = AQI of 151 - 200 = Ozone Con. 0.105 - 0.124 ppm
PURPLE = of AQI - 201 + = Ozone Con. 0.125 +

In 2000, Roanoke had 2 days when the 8 Hour peak exceeded the 85 ppb standard.

**June 8, 2000 was not a valid sampling day due to missing hours, the max. 8-hour
average for the day was .070 ppm.

NATIONAL WEATHER SERVICE OFFICE BLACKSBURG, VA
MONTHLY CLIMATE SUMMARY
500 AM EDT THU JUN 1 2000

...MONTHLY CLIMATE SUMMARY FOR MAY 2000...

Overall for the month of May . . . temperatures were above normal on an average and the
precipitation fell below normal for the monthly average. Looking back . . . the month of
May displayed a stormy and unsettled nature, providing southwest and south central
Virginia with some much needed precipitation. A very typical springtime scenario.
Warm record breaking temperatures occurred the first couple of weeks over much of the
area providing the utility companies with a boost in revenues as air conditioners were a
constant.
By mid month, a strong cold front swept through the region producing severe weather.
There were reports of trees down in Campbell and Buckingham counties. In addition to
high wind damage, hail occurred over Surry, Patrick, and Wilkes counties with the sizes
ranging from 1 to 1 3/4 inches in diameter. By the next day, after frontal passage
occurred, high temperatures were 15-20 degrees cooler over the region . . . Much more
comfortable for most of us.
In Roanoke . . .
MONTHLY MAXIMUM TEMPERATURE: 92...on the 13TH.
MONTHLY MINIMUM TEMPERATURE: 40...on the 16TH.
MONTHLY MEAN TEMPERATURE: 67.6...which was 3.5 DEGREES above normal.
TOTAL MONTHLY PRECIPITATION: 2.67 INCHES...which was 1.31 INCHES below
normal.
--------------------------

MONTHLY CLIMATE SUMMARY
NATIONAL WEATHER SERVICE BLACKSBURG VA
100 PM EDT THU JUL 06 2000

...MONTHLY CLIMATE SUMMARY FOR JUNE 2000...

The Stormy weather that began in mid May, continued for most of the month of June,
with Virginia enjoying cooling summer rains. Starting June 2, a powerful cold front
swept through the area delivering the usual wind damage, hail up to baseball size near
South Boston, in Halifax County, then moved back as a warm front on the 5th and 6th
with flooding. With the atmosphere stabilized during the second week of the month, hot
and hazy weather returned with near record temperatures. On the 13th, a very slow
moving cold front, taking nearly a week to pass through, brought more hail, wind
damage, and flooding each afternoon and evening. With cool air in place after the cold
front, the 3rd week of June was just the opposite of the 2nd, with very nice, less humid
days. On the 25th, yet another cold front returned, lasting through the 27th. With the
ground saturated from nearly a month of rain, mostly flash flooding occurred.
Precipitation for the month was above normal. The largest amount recorded was at
Yancyville, NC with 9.67 inches. Temperatures were near normal, even with the
fluctuations of warm and cool days through the month.

IN ROANOKE...
MONTHLY MAX TEMPERATURE: 92 on the 25TH.
MONTHLY MIN TEMPERATURE: 52 on the 7TH and 8TH.
MONTHLY MEAN TEMPERATURE: 74...which is normal for the month.
TOTAL MONTHLY PRECIPITATION: 4.71 INCHES...which is 1.52 INCHES
above normal.
-------------------------

MONTHLY CLIMATE SUMMARY
NATIONAL WEATHER SERVICE BLACKSBURG VA
733 AM EDT TUE AUG 01 2000

...MONTHLY CLIMATE SUMMARY FOR JULY 2000...

In Roanoke . . . Rain fell on 15 days. Heaviest amount was on the 24th . . . when 1.83
inches fell. Second heaviest amount was 1.59 inches on the 31st . . . with 1.24 inches
falling on the 29th. Overall a wet month but not quite enough to make the Top 10 list.

Although rainfall was above the monthly averages . . . the rain was sporadic. Some
places experienced flash flooding because of the heavy showers . . . and other places
received slight amounts of rain during the same time. Because of the clouds and rain . . .
temperatures averaged below normal for the month.

IN ROANOKE...
MONTHLY MAX TEMPERATURE: 91 on the 9TH and 10TH.
MONTHLY MIN TEMPERATURE: 57 on the 2ND and 4TH.
MONTHLY MEAN TEMPERATURE: 73...which is 3 DEGREES below normal for the
month.
TOTAL MONTHLY PRECIPITATION: 7.16 INCHES...which is 3.25 INCHES above
normal.
------------------------

NATIONAL WEATHER SERVICE OFFICE BLACKSBURG, VA
MONTHLY CLIMATE SUMMARY
400 AM EDT FRI SEP 1 2000

...MONTHLY CLIMATE SUMMARY FOR AUGUST 2000...

The month of August was generally wetter and cooler than normal. There were a couple
of outbreaks of severe weather during the month. . .notably on the 9th and on the
27th...when an extensive complex of thunderstorms moved southward through West
Virginia and southwestern Virginia. On both days the storms were accompanied by
frequent lightning and heavy rain but not by particularly strong winds. Peak winds on the
9th at both Roanoke and Lynchburg were only around 25 mph...and on the 27th only
around 20 mph. In Roanoke . . .the month was cooler than normal...but rainfall was
almost an inch below normal.

MONTHLY MAXIMUM TEMPERATURE: 91...on the 7TH.
MONTHLY MINIMUM TEMPERATURE: 56...on the 21st and 22nd.
MONTHLY MEAN TEMPERATURE: 72.9...which was 1.8 DEGREES below normal.
TOTAL MONTHLY PRECIPITATION: 3.16 INCHES...which was 0.99 INCHES below
normal