The Weather Wire
July 2004 Volume 11 Number 7
Avg High 76.9
Avg Low 50.5
Snow - 0.0"
Season Snow - 38.0"
Precipitation - 2.33"
Avg High 82.1
Avg Low 53.0
Avg Snow - 0
Avg Precip - 1.56"
Watches and Warnings|
There always seems to be some confusion when weather watches and warnings are issued. Not to mention what constitutes a severe thunderstorm. So below find the definitions for severe weather events.
In general a watch means conditions are favorable for that event, while a warning means that the event is already occurring or is imminent.
Definitions used with Summer Severe Events
Severe Thunderstorm Watch: Conditions are favorable for the formation of severe thunderstorms in AND NEAR the watch area. By definition, a severe thunderstorm has hail ¾ inch or larger, and/or winds GE 58mph. Note heavy rain is not a necessary component of a severe thunderstorm. Watch the sky and stay tuned to know when warnings are issued.
Severe Thunderstorm Warning: Issued when severe weather has been reported by spotters or indicated by radar. A severe thunderstorm warning indicates the storm has hail ¾ inch or large, and/or winds GE 58mph. Warnings indicate imminent danger to life and property to those in the path of the storm.
Tornado Watch: Conditions are favorable for the formation of tornadoes in AND NEAR the watch area. Implicit in this watch are the possibility of severe thunderstorms, as defined above. Remain alert for approaching storms. Know what counties are in the watch area by listening to NOAA Weather Radio or your local radio/television outlets.
Tornado Warning: A tornado has been sighted by spotters in the field, or indicated by NWS Doppler radar.
Flash Flood Watch: Issued when heavy rain may develop and result in flash flooding in or near the watch area.
Flash Flood Warning: Flash flooding in the warning area has developed or is imminent!
Urban and Small Stream Flood Advisory: Local flooding of small streams, streets, or low lying areas such as railroad underpasses is occurring or is imminent. Note: this is issued for lesser rainfall events than a flash flood, though danger to life and property still may exist.
Note: Watches tend to cover a large geographic area (many counties), and tend to be issued for moderately long time periods (3-6 hours). Warnings cover a much smaller area (portion of a county or portions of several counties) for a much shorter time period (30-60 minutes typical).
In many portions of Colorado, June 2004 saw above normal precipitation. With the abundant moisture, the drought situation improved considerably across the entire state.
The map below shows forecasted temperature deviances for the July 2004 time period. As can be seen, normal or near normal temperatures are expected for most of Colorado for July, though areas in the western 1/3 of the state have forecasted temperatures above normal..
The map below shows forecasted precipitation deviances for July 2004. Normal or near normal precipitation is expected for July 2004 all of Colorado.
As can be seen in the below map, drought conditions are expected to continue to persist across the western 2/3s of the state, though some improvement is noted in the eastern 1/3 of Colorado through September.
Finally an above normal month for rainfall!!!
The below normal monthly precipitation streak for Denver ends at 11. 2.33 inches of rainfall fell in the rain gage which was 0.77 inch above normal. There were 13 days with measurable precipitation which is 4 above normal. From the 16th through the 21st, each day recorded measurable rainfall for a total of 1.31 inches. Although above normal it was not enough to get into the top 10 wettest Junes. Even though we had above normal rainfall for June the year as a whole is still below normal by 2.12 inches. Again as we have stressed in this newsletter many times DIA is not the best representative of the metro area as a whole as many areas had 4 inches or more from heavy storms.
June 2004 finished with an average temperature of 63.7 degrees which is 3.9 degrees below normal. Temperatures ranged from a record setting 98 degrees down to a low of 41 degrees. Only 3 90 degree days were seen for June so yes it did feel a bit on the cool side for the month as a whole.
On the 15th, a funnel cloud was observed at DIA and there were 13 thunderstorms reported. No hail was reported at DIA, but as many homeowners in the southwest metro area know hail the size of golf balls did a fair amount of damage to homes throughout the area. Also heavy rains caused flooding in portions of Jefferson Country including Ken Caryl, Golden and portions of Lakewood.
July is normally a stormy month in Denver.
Denver’s weather is notorious for being changeable. However, this is not the case during July. Most July mornings are sunny with clouds developing during the late morning and early afternoon. By mid afternoon, thunderstorms have developed over the foothills and drift across the Denver metro area and onto the eastern plains. Severe thunderstorms containing large hail, strong gusty winds and heavy downpours are not uncommon during July for the Denver metro area.
The worst hail storm on record in Denver history moved across the western sections of the city on July 8th, 1990. This storm dropped baseball to softball sized hail and caused millions of dollars worth of property damage.
July is the stormiest month of the year with thunderstorms occurring about every third day or usually 11 days per month. Most of the rainfall during the month is the result of slow moving thunderstorms, which cause precipitation amounts to vary tremendously at different locations across the metro area. It is not unusual for some areas of the city to receive two or three times as much rainfall as other areas. Flash flooding is also quite possible during July.
The 30 day outlook for July calls for near normal precipitation and near normal temperatures.
Sunrise/Sunset (Denver area)