Alert archive / Colorado / Severe Thunderstorm Warnings in 1994
Severe Thunderstorm Warning 55, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 18, 1994, 2:51 PM MDT for Denver County, Jefferson County, Colorado. It was in force for 24 min.
The area
The counties it named.
The facts
- Issued
- Jun 18, 1994, 2:51 PM MDT (20:51 UTC)
- Expired
- Jun 18, 1994, 3:15 PM MDT
- In force
- 24 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Denver County, CO, Jefferson County, CO
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 8.9 hours before the alert went out and 158 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1621 J/kg
- Mixed-layer CIN
- -170 J/kg
- Mixed-layer LCL
- 988 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jun 18, 12:17 PM MDT, 2 hours 34 minutes before
COZ038>050-091-092-181900- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1220 PM MDT SAT JUN 18 1994 ...THUNDERSTORMS BUILDING RAPIDLY OVER THE FRONT RANGE FOOTHILLS... AT 1215 PM MDT...SCATTERED THUNDERSTORMS WERE BUILDING RAPIDLY FROM WESTERN JEFFERSON COUNTY NORTHWARD THROUGH WESTERN BOULDER COUNTY INTO WESTERN LARIMER COUNTY. THESE STORMS SHOWED LITTLE MOVEMENT. SCATTERED THUNDERSTORMS SHOULD DEVELOP EASTWARD OVER MUCH OF THE NORTHEAST PLAINS BY 3 PM. THERE WILL BE GOOD POTENTIAL FOR SEVERE STORMS THIS AFTERNOON AND EVENING. THE MAIN THREAT WILL BE LARGE HAIL AND HEAVY RAINFALL. BE READY FOR THREATENING WEATHER...ESPECIALLY IF YOU PLAN TO BE OUTDOORS. STORMS WILL POP UP QUICKLY. HEAVY RAINFALL COULD RESULT IN LOCALIZED FLOODING. KEEP TUNED TO NOAA WEATHER FOR POSSIBLE WATCHES...WARNINGS...OR OTHER WEATHER STATEMENTS. DULONG
Special weather statement, Jun 18, 12:20 PM MDT, 2 hours 31 minutes before
COZ038>050-091-092-181900- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1220 PM MDT SAT JUN 18 1994 ...THUNDERSTORMS BUILDING RAPIDLY OVER THE FRONT RANGE FOOTHILLS... AT 1215 PM MDT...SCATTERED THUNDERSTORMS WERE BUILDING RAPIDLY FROM WESTERN JEFFERSON COUNTY NORTHWARD THROUGH WESTERN BOULDER COUNTY INTO WESTERN LARIMER COUNTY. THESE STORMS SHOWED LITTLE MOVEMENT. SCATTERED THUNDERSTORMS SHOULD DEVELOP EASTWARD OVER MUCH OF THE NORTHEAST PLAINS BY 3 PM. THERE WILL BE GOOD POTENTIAL FOR SEVERE STORMS THIS AFTERNOON AND EVENING. THE MAIN THREAT WILL BE LARGE HAIL AND HEAVY RAINFALL. BE READY FOR THREATENING WEATHER...ESPECIALLY IF YOU PLAN TO BE OUTDOORS. STORMS WILL POP UP QUICKLY. HEAVY RAINFALL COULD RESULT IN LOCALIZED FLOODING. KEEP TUNED TO NOAA WEATHER FOR POSSIBLE WATCHES...WARNINGS...OR OTHER WEATHER STATEMENTS. DULONG
Special weather statement, Jun 18, 12:50 PM MDT, 2 hours 1 minute before
COZ040>041-045-181930- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1250 PM MDT SAT JUN 18 1994 ...STRONG THUNDERSTORM WITH HAIL IN DOUGLAS COUNTY... ...TORNADO WATCH IN EFFECT FOR URBAN CORRIDOR AND ADJACENT PLAINS UNTIL 700 PM MDT THIS EVENING... AT 1240 PM MDT...PEA TO MARBLE SIZE HAIL WAS OCCURRING IN THE CITY OF CASTLE ROCK. DOPPLER RADAR SHOWED THIS STORM MOVING VERY SLOWLY TOWARDS THE NORTH. OTHER STORMS WERE RAPIDLY DEVELOPING NORTHEASTWARD ALONG A BOUNDARY FROM NEAR PARKER AND FRANKTOWN TO THE BENNETT AREA. THESE STORMS SHOULD SPREAD TOWARDS METRO DENVER BY 2 PM. TAKE COVER IF THREATENING WEATHER APPROACHES...AND MONITOR NOAA WEATHER RADIO FOR POSSIBLE WARNINGS. DULONG WWUS35KSDF .D
Special weather statement, Jun 18, 12:52 PM MDT, 1 hour 59 minutes before
COZ040>041-045-181930- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1250 PM MDT SAT JUN 18 1994 ...STRONG THUNDERSTORM WITH HAIL IN DOUGLAS COUNTY... ...TORNADO WATCH IN EFFECT FOR URBAN CORRIDOR AND ADJACENT PLAINS UNTIL 700 PM MDT THIS EVENING... AT 1240 PM MDT...PEA TO MARBLE SIZE HAIL WAS OCCURRING IN THE CITY OF CASTLE ROCK. DOPPLER RADAR SHOWED THIS STORM MOVING VERY SLOWLY TOWARDS THE NORTH. OTHER STORMS WERE RAPIDLY DEVELOPING NORTHEASTWARD ALONG A BOUNDARY FROM NEAR PARKER AND FRANKTOWN TO THE BENNETT AREA. THESE STORMS SHOULD SPREAD TOWARDS METRO DENVER BY 2 PM. TAKE COVER IF THREATENING WEATHER APPROACHES...AND MONITOR NOAA WEATHER RADIO FOR POSSIBLE HWARNINGS. DULONG
Special weather statement, Jun 18, 1:54 PM MDT, 57 minutes before
COZ040>041-045-181930- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 155 PM MDT SAT JUN 18 1994 ...STRONG THUNDERSTORMS TO MOVE INTO DENVER... AT 152 PM MDT...NUMEROUS THUNDERSTORMS WERE LOCATED EAST AND SOUTH OF THE DENVER AREA. THESE THUNDERSTORMS WILL BE MOVING SLOWLY WESTWARD AND PERSONS IN AND NEAR THE DENVER METROPOLITAN AREA CAN EXPECT THUNDERSTORMS WITH FREQUENT LIGHTNING...HEAVY RAINS AND HAIL BETWEEN 200 AND 400 PM. THESES STORMS COULD DROP FROM 1 TO 2 INCHES OF RAIN IN A 30 MINUTE PERIOD OF TIME AND CAUSE LOCALIZED STREET FLOODING. THE POSSIBILITY ALSO EXISTS THAT SOME OF THE STORMS COULD PRODUCE LARGE HAIL. A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 P|M MDT.
Special weather statement, Jun 18, 1:55 PM MDT, 56 minutes before
COZ040>041-045-181930- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 155 PM MDT SAT JUN 18 1994 ...STRONG THUNDERSTORMS TO MOVE INTO DENVER... AT 152 PM MDT...NUMEROUS THUNDERSTORMS WERE LOCATED EAST AND SOUTH OF THE DENVER AREA. THESE THUNDERSTORMS WILL BE MOVING SLOWLY WESTWARD AND PERSONS IN AND NEAR THE DENVER METROPOLITAN AREA CAN EXPECT THUNDERSTORMS WITH FREQUENT LIGHTNING...HEAVY RAINS AND HAIL BETWEEN 200 AND 400 PM. THESES STORMS COULD DROP FROM 1 TO 2 INCHES OF RAIN IN A 30 MINUTE PERIOD OF TIME AND CAUSE LOCALIZED STREET FLOODING. THE POSSIBILITY ALSO EXISTS THAT SOME OF THE STORMS COULD PRODUCE LARGE HAIL. A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM MDT.
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 12:59 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 31 min |
| Jun 18, 1:10 PM MDT | Tornado Warning | BOU | Douglas | 20 min |
| Jun 18, 1:52 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 53 min |
| Jun 18, 2:05 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 40 min |
| Jun 18, 2:32 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 43 min |
| Jun 18, 2:44 PM MDT | Tornado Warning | BOU | Weld | 26 min |
| Jun 18, 2:45 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver | 45 min |
| Jun 18, 3:10 PM MDT | Severe Thunderstorm Warning | BOU | Denver, Jefferson | 35 min |
| Jun 18, 3:24 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 36 min |
| Jun 18, 3:36 PM MDT | Severe Thunderstorm Warning | BOU | Boulder | 24 min |
| Jun 18, 4:00 PM MDT | Severe Thunderstorm Warning | BOU | Boulder | 30 min |
| Jun 18, 4:29 PM MDT | Severe Thunderstorm Warning | BOU | Boulder | 31 min |
| Jun 18, 5:00 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Morgan, Washington | 30 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1994Every severe thunderstorm warning in 1994
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.