Alert archive / Colorado / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 145, NWS Denver/Boulder, CO

August 8, 1998Morgan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 8, 1998, 6:25 PM MDT for Morgan County, Colorado. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 8, 1998, 6:25 PM MDT (00:25 UTC)
Expired
Aug 8, 1998, 7:15 PM MDT
In force
50 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County Morgan County, CO

The radar

The Denver radar (KFTG), 82 km from the middle of the area, began a volume at 00:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.4 hours before the alert went out and 66 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, Denver, CO at 00:00Z on 1998-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 105 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 1998-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 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
105 J/kg
Mixed-layer CIN
-71 J/kg
Mixed-layer LCL
3401 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
94 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDEN 090028
SVRDEN
COC087-090115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
625 PM MDT SAT AUG 8 1998

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
     SOUTHERN MORGAN COUNTY IN NORTHEAST COLORADO

* UNTIL 715 PM MDT

* AT 618 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES EAST OF TWELVE-MILE CORNER...OR ABOUT  
  12 MILES SOUTHEAST OF FORT MORGAN.  ANOTHER SEVERE STORM WAS       
  LOCATED ABOUT 5 MILES SOUTHWEST OF FORT MORGAN.  BOTH OF THESE     
  STORMS SHOWED VERY LITTLE MOVEMENT.

LOCATIONS IN THE WARNING INCLUDE...ADENA SCHOOL...GARY... 
TWELVE-MILE CORNER AND FORT MORGAN.

LARGE HAIL...INTENSE RAIN AND STRONG DAMAGING WINDS IN EXCESS OF 60 
MPH ARE LIKELY WITH THIS STORM. TAKE COVER IN A SUBSTANTIAL SHELTER 
UNTIL THE STORM PASSES.

HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY
MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO
RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.

LAT...LON 4022 10402 4001 10404 4002 V10356 4023 10356

KLEYLA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 8, 6:20 PM MDTFlash Flood WarningBOUMorgan85 min
Aug 8, 7:12 PM MDTFlash Flood WarningBOUMorgan93 min
Aug 8, 8:59 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe31 min
Aug 9, 3:35 AM MDTFlash Flood WarningBOULincoln3 hr
Aug 9, 3:38 AM MDTFlash Flood WarningBOULincoln3 hr
Aug 9, 3:02 PM MDTSevere Thunderstorm WarningBOUDouglas43 min
Aug 9, 3:32 PM MDTSevere Thunderstorm WarningBOUDouglas, Elbert43 min
Aug 9, 3:38 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert52 min
Aug 9, 3:48 PM MDTTornado WarningBOUAdams27 min
Aug 9, 3:57 PM MDTTornado WarningBOUMorgan, Weld48 min
Aug 9, 4:01 PM MDTSevere Thunderstorm WarningBOUWashington44 min
Aug 9, 4:33 PM MDTFlash Flood WarningBOUAdams, Morgan117 min
Aug 9, 4:43 PM MDTTornado WarningBOUAdams, Morgan, Weld32 min
Aug 9, 4:49 PM MDTFlash Flood WarningBOUWashington86 min
Aug 9, 4:52 PM MDTSevere Thunderstorm WarningBOULincoln, Washington38 min
Aug 9, 5:21 PM MDTFlash Flood WarningBOULincoln, Washington99 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1998Every severe thunderstorm warning in 1998

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; radar from the NEXRAD Level II archive.