Alert archive / Colorado / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 37, NWS Denver/Boulder, CO

July 11, 1990Douglas County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 11, 1990, 3:10 PM MDT for Douglas County, Colorado. It was in force for 30 min.

The area

The counties it named.

The facts

Issued
Jul 11, 1990, 3:10 PM MDT (21:10 UTC)
Expired
Jul 11, 1990, 3:40 PM MDT
In force
30 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County Douglas 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

Fort Carson/Butt, CO (KFCS), launched 12:00Z, 9.2 hours before the alert went out and 75 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.

Skew-T log-pSkew-T log-p diagram, Fort Carson/Butt, CO at 12:00Z on 1990-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Carson/Butt, CO at 12:00Z on 1990-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1472 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
5 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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, Jul 11, 12:48 PM MDT, 2 hours 22 minutes before
COZ011-014-111930-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1245 PM MDT WED JUL 11 1990

...THUNDERSTORMS ARE BEGINNING TO DEVELOP ALONG THE FOOTHILLS...

AT 1241 PM NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED
THUNDERSTORMS BEGINNING TO FIRE OVER THE NORTHERN FOOTHILLS AND
PALMER DIVIDE.  THE STRONGEST STORM WAS LOCATED 7 MILES EAST OF
ESTES PARK...AND MOVING SOUTHEAST AT 20 MPH.

STORMS WILL CONTINUE TO DEVELOP ALONG THE FOOTHILLS EARLY
THIS AFTERNOON...AND MOVE OUT INTO THE PLAINS BY MID
AFTERNOON.  STORMS SHOULD CONTINUE MOVING SOUTHEAST AT 15 TO 25 MPH.
LOCALLY HEAVY RAIN...HAIL...AND FREQUENT LIGHTNING WILL BE POSSIBLE
WITH STORMS THIS AFTERNOON.

RTG

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 11, 1:00 PM MDTSevere Thunderstorm WarningBOUBoulder, Larimer40 min
Jul 11, 1:42 PM MDTSevere Thunderstorm WarningBOUAdams, Boulder, Jefferson48 min
Jul 11, 2:15 PM MDTSevere Thunderstorm WarningBOUAdams, Denver, Jefferson90 min
Jul 11, 2:30 PM MDTSevere Thunderstorm WarningBOUAdams, Denver, Jefferson15 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1990Every severe thunderstorm warning 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.