Alert archive / Colorado / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 6, NWS Denver/Boulder, CO

May 5, 1998Logan County, Phillips County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 5, 1998, 7:19 PM MDT for Logan County, Phillips County, Colorado. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: May 5, 1998, 7:19 PM MDT (01:19 UTC)
Expired: May 5, 1998, 8:00 PM MDT
In force: 41 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Logan County, CO, Phillips County, CO

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.3 hours before the alert went out and 90 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 351 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1870 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDEN 060119 RRA
SVRDEN
COC075-095-060200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
719 PM MDT TUE MAY 5 1998

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
     SOUTHEASTERN LOGAN COUNTY IN NORTHEAST COLORADO
     WESTERN PHILLIPS COUNTY IN NORTHEAST COLORADO

* UNTIL 800 PM MDT

* AT 718 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES WEST OF HIGHLAND CENTER...OR ABOUT 21
  MILES WEST OF HOLYOKE...MOVING SOUTHEAST AT 30 MILES PER HOUR.

* LOCATIONS IN THE WARNING INCLUDE HAXTUN...HIGHLAND CENTER...
  PAOLI...ST PETERSBURG AND WAGES

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS OVER 60
MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

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 4047 10291 4045 10245 4072 10237 4071 10275

COOPER

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, May 5, 2:50 PM MDT, 4 hours 29 minutes before

COZ044-045-049-052145-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
250 PM MDT TUE MAY 5 1998

AT 235 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
AREA OF THUNDERSTORMS OVER EASTERN ADAMS...WEST CENTRAL
WASHINGTON...EXTREME NORTHEASTERN ARAPAHOE AND SOUTHEASTERN MORGAN
COUNTIES.  THE STRONGEST STORM WAS 4 MILES SOUTHEAST OF WOODROW...OR
ABOUT 25 MILES SOUTHWEST OF AKRON...MOVING NORTHEAST AT 15 MILES PER
HOUR.

HEAVY RAIN WAS OCCURRING WITH THESE STORMS.  DOPPLER RADAR INDICATED
UP TO AN INCH AND A HALF OF RAIN HAD FALLEN IN AN HOURS TIME OVER WEST
CENTRAL WASHINGTON COUNTY...JUST WEST OF WOODROW.  LOCALIZED
FLOODING OF SMALL STREAMS AND ROADWAYS IS POSSIBLE...ESPECIALLY IN
WEST CENTRAL WASHINGTON COUNTY.

PERSONS IN OR NEAR GARY...LAST CHANCE...SHAMROCK...WOODLIN SCHOOL AND
WOODROW SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO
A PLACE OF SAFETY IF BAD WEATHER APPROACHES.

LESZCYNSKI

Special weather statement, May 5, 3:35 PM MDT, 3 hours 44 minutes before

COZ030-032>050-065>068-070-081-061200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
345PM MDT TUESDAY MAY 5 1998

...EASTERN COLORADO RIVERS BEGINNING TO RISE...

THE MOUNTAIN SNOWPACK IN EASTERN COLORADO IS BEGINNING ITS SLOW
MELT FOR THE SEASON. IT CURRENTLY STANDS AT AROUND 105 PERCENT OF
NORMAL...NOT ENOUGH FOR WIDESPREAD SERIOUS FLOODING UNDER NORMAL
CIRCUMSTANCES.

STREAMS IN EASTERN COLORADO WHICH ARE MONITORED BY THE NATIONAL
WEATHER SERVICE IN DENVER ARE CURRENTLY WELL BELOW BANKFULL AND POSE
NO FLOODING PROBLEMS AT THE PRESENT TIME.

HOWEVER...WE ARE APPROACHING THE TIME OF YEAR WHEN HEAVY SLOW MOVING
THUNDERSTORMS BEGIN TO AFFECT THE STATE...PARTICULARLY THE AREA EAST
OF THE CONTINENTAL DIVIDE. THIS COULD LEAD TO PROBLEMS ALONG SMALLER
STREAMS WHEN THEY ARE ALREADY NEAR BANKFULL DUE TO SNOW MELT.

WEATHER FORECASTS FOR THE NEXT SEVERAL DAYS POINT TO SCATTERED
SHOWERS AND THUNDERSTORMS THROUGHOUT EASTERN COLORADO...BUT NOT
WIDESPREAD ENOUGH OR HEAVY ENOUGH TO ADD LARGE AMOUNTS OF WATER TO
THE RIVERS. TEMPERATURES WILL BE HIGH ENOUGH TO CONTINUE SLOW
MELTING OF THE MOUNTAIN SNOWPACK...BUT NOT HIGH ENOUGH TO MELT
LARGE AMOUNTS OF SNOW ON A DAILY BASIS.

BOTTOM LINE...THROUGH FRIDAY LOOK FOR CONTINUED SLOW RISES IN RIVER
LEVELS IN EASTERN COLORADO. IN ADDITION...BE AWARE THAT MOIST SOIL
CONDITIONS OVER MUCH OF THE AREA MAY LEAD TO ROCK AND MUD SLIDES IN
FOOTHILL AND MOUNTAIN AREAS. BE CAREFUL.

TUNNELL

Local storm report, May 5, 5:35 PM MDT, 1 hour 44 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
535 PM MDT TUE MAY 5 1998

...PRELIMINARY STORM REPORT FOR MAY 05 1998...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1655 PM    31SE AKRON                CO      0.75 INCH HAIL
05/05/98   WASHINGTON                        HAIL 2-3 DEEP

LESZCYNSKI

Local storm report, May 5, 5:35 PM MDT, 1 hour 44 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
535 PM MDT TUE MAY 5 1998

...PRELIMINARY STORM REPORT FOR MAY 05 1998...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1655 PM    31SE AKRON                CO      0.75 INCH HAIL
05/05/98   WASHINGTON                        HAIL 2-3 DEEP

LESZCYNSKI

Local storm report, May 5, 6:15 PM MDT, 1 hour 4 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
615 PM MDT TUE MAY 5 1998

...PRELIMINARY STORM REPORT FOR MAY 05 1998...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1545 PM    EVANS                     CO      1.00 INCH HAIL
05/05/98   WELD

1655 PM    31SE AKRON                CO      0.75 INCH HAIL
05/05/98   WASHINGTON                        HAIL 2-3 DEEP

COOPER

Local storm report, May 5, 6:15 PM MDT, 1 hour 4 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
615 PM MDT TUE MAY 5 1998

...PRELIMINARY STORM REPORT FOR MAY 05 1998...

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1545 PM    EVANS                     CO      1.00 INCH HAIL
05/05/98   WELD

1655 PM    31SE AKRON                CO      0.75 INCH HAIL
05/05/98   WASHINGTON                        HAIL 2-3 DEEP

COOPER

Nearby

Severe Thunderstorm Warnings in Colorado, 1998 Every 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.