Severe Thunderstorm Warning 33, NWS Denver/Boulder, CO

Issued

Jul 11, 1990, 1:00 PM MDT (19:00 UTC)

Expired

Jul 11, 1990, 1:40 PM MDT

In force

40 min

Issued by

NWS Denver/Boulder, CO

Area

Whole counties

Counties Boulder County, CO, Larimer County, CO

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

000 
TTAA00 KDEN 111902
SVRDEN
COC013-069-111940-

BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
1 PM MDT WED JUL 11 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 140 PM  MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:

     BOULDER
     EXTREME SOUTH CENTRAL LARIMER

INCLUDING THE FOLLOWING TOWNS/CITIES:

     BERTHOUD..JAMESTOWN..LONGMONT..LYONS..NIWOT AND BOULDER

THE STORM WAS LOCATED 8 MILES NORTHWEST OF LYONS..WHICH IS 25
MILES SOUTHWEST OF FT COLLINS.  NATIONAL WEATHER SERVICE DOPPLER 
RADAR INDICATED A STORM MOVEMENT TO THE SOUTH SOUTHEAST AT 
20 MPH.  

HAIL TO THREE QUARTER INCH WAS REPORTED AT GLEN COMFORT IN THE 
BIG THOMPSON CANYON 7 MILES EAST OF ESTES PARK AT 1250 PM.  
NIWOT AND LONGMONT ARE IN THE DIRECT PATH OF THIS STORM...AND 
WILL LIKELY SEE THE STORM BEFORE 120 PM MDT.  RESIDENTS SHOULD
TAKE COVER IF THREATENED BY SEVERE WEATHER...AND PUT YOUR CARS
IN A GARAGE IF POSSIBLE AS LARGER HAIL IS POSSIBLE WITH THIS 
STORM. 

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.

RTG

LAT..LON  4003 10507 4004 10546 4035 10548 4035 10507

In the hours 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

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

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.