Alert archive / Colorado / Tornado Warnings in 1990
Tornado Warning 11, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jul 9, 1990, 10:00 PM MDT for Logan County, Morgan County, Washington County, Colorado. It was in force for 45 min.
The area
The counties it named.
The facts
- Issued
- Jul 9, 1990, 10:00 PM MDT (04:00 UTC)
- Expired
- Jul 9, 1990, 10:45 PM MDT
- In force
- 45 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Logan County, CO, Morgan County, CO, Washington County, CO
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 4.0 hours before the alert went out and 51 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
- 2289 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 1419 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 100401
TORDEN
COC121-087-075-100445-
BULLETIN...EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
1000 PM MDT MON JUL 09 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 1045 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF NORTHEAST COLORADO:
NORTH CENTRAL WASHINGTON
MORGAN
SOUTHWESTERN LOGAN
INCLUDING THE FOLLOWING TOWNS/CITIES:
AKRON..ATWOOD..BRUSH..FT MORGAN..HILLROSE..MERINO..
STERLING..AND WILLARD
AT 1000 PM MDT RADAR WAS INDICATING A LARGE SEVERE THUNDERSTORM WITH A
POSSIBLE TORNADO OVER EAST CENTRAL MORGAN COUNTY. THIS IS ABOUT 5 MILES
EAST OF FT MORGAN OR 35 MILES SOUTHWEST OF STERLING.
THIS STORM WAS MOVING TO THE EAST AT 45 MPH.
THIS STORM HAS PRODUCED SEVERE WIND GUSTS OF 60 TO 70 MPH OVER WESTERN
MORGAN COUNTY AND HAS CAUSED POWER BLACKOUTS IN THE FT MORGAN AREA.
TOWNS IN THE PATH INCLUDE BRUSH...WILLARD...GARY...AND SNYDER IN EASTERN
MORGAN COUNTY. IN WASHINGTON COUNTY PINNEO...XENIA...AND AKRON. AND IN
LOGAN COUNTY ATWOOD AND STERLING.
IN HOMES GO TO THE BASEMENT OR INTO A CLOSET OR BATHROOM.
IN SCHOOLS..HIGH RISES AND HOSPITALS GO TO AN INTERIOR
HALLWAY ON THE LOWEST FLOOR. IF IN MOBILE HOMES OR VEHICLES..
EVACUATE THEM AND GO TO A SUBSTANTIAL SHELTER. IF NO SHELTER
IS AVAILABLE..LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT.
IN ALL CASES..STAY AWAY FROM WINDOWS..DOORS AND OUTSIDE WALLS.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE
IN DENVER..OR CALL YOUR REPORT TO THE NATIONAL WEATHER SERVICE
AT 361-0663. DO NOT CALL THIS NUMBER FOR INFORMATION.
LAT..LON 4000 10309 4010 10386 4043 10387 4064 10319The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 6:57 PM MDT | Tornado Warning | BOU | Adams, Arapahoe, Denver | 45 min |
| Jul 9, 7:58 PM MDT | Severe Thunderstorm Warning | BOU | Denver, Jefferson | 32 min |
| Jul 9, 7:58 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 42 min |
| Jul 9, 9:10 PM MDT | Tornado Warning | BOU | Washington | 43 min |
| Jul 9, 9:10 PM MDT | Tornado Warning | BOU | Morgan, Weld | 43 min |
| Jul 9, 10:52 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 38 min |
Nearby
Tornado Warnings in Colorado, 1990Every tornado warning in 1990Tornadoes in 1990
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.