Alert archive / Colorado / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 13, NWS Goodland, KS

May 13, 1999Yuma County, Colorado

NWS Goodland, KS issued this severe thunderstorm warning at May 13, 1999, 8:40 PM MDT for Yuma 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: May 13, 1999, 8:40 PM MDT (02:40 UTC)
Expired: May 13, 1999, 9:30 PM MDT
In force: 50 min
Issued by: NWS Goodland, KS
Area: Whole counties

County Yuma County, CO

The radar

The Goodland radar (KGLD), 94 km from the middle of the area, began a volume at 02:43 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, 2.7 hours before the alert went out and 70 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: 166 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 2490 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 221 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KGLD 140242 RRA
SVRGLD
COC125-140330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GOODLAND KS
840 PM MDT THU MAY 13 1999

THE NATIONAL WEATHER SERVICE IN GOODLAND HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL YUMA COUNTY IN NORTHEASTERN COLORADO

* UNTIL 930 PM MDT

* AT 838 PM MDT... GOODLAND DOPPLER RADAR INDICATED A SEVERE
  THUNDERSTORM 4 MILES NORTHWEST OF WRAY... MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WRAY                                    AROUND 840 PM MDT
  HWY 385...8 MILES NORTH OF WRAY         AROUND 845 PM MDT
  7 MILES NORTH OF LAIRD                  AROUND 900 PM MDT

DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY
BUILDING AND STAY AWAY FROM WINDOWS

THEDE/BULLER

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.

NWS Goodland, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at May 13, 2:23 PM MDT, 6 hours 17 minutes earlier.

Area forecast discussion, May 13, 2:23 PM MDT, 6 hours 17 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GOODLAND KS
214 PM MDT (314 PM CDT) THU MAY 13 1999

...CHALLENGES ARE MANY..FROM 2ND PD ON..WHERE WILL DRY LINE BE AND
WHEN WILL CAP BREAK?..

BASED ON INITIALIZATION AM GOING WITH AN ETA/AVN MIX. BOTH SEEM TO
BE BETTER WITH RESPECT TO POSITIONS AND INTENSITY OF SFC
COMPONENTS...BUT NOT MUCH DIFFERENCE. ALL MODELS SIMILAR ALOFT.

THRU FCST PD APPEARS MY CWA WILL BE THE TRANSITION AREA BETWEEN
DRIER AND MORE STABLE CONDITIONS TO SOUTH AND SIGNIFICANT AND ACTIVE
AREA TO THE IMMEDIATE NORTH AND NORTHEAST. FCST FURTHER COMPLICATED
BY MODELS INDICATING DRY LINE TO FLUCTUATE BACK-AND-FORTH FROM W-E-W
OVER THE PD WITH SIGNIFICANT DIFFERENCES IN DEWPOINTS ACROSS
DRYLINE.

APPEARS CAP WILL HOLD OVER MOST OF CWA THRU FRI PM BEFORE BEGINNING
AN EASTWARD SHIFT. HOWEVER BOUNDARIES CAUSED BY POTENTIAL TSTM
OUTBREAK IN SW NEB COULD CAUSE RAPID BREAK IN CAP...PARTICULARLY N
OF INTERSTATE 70...LATE TONIGHT AND FRI. BY FRI EVENING ON SEE UPPER
SUPPORT BECOMING MORE FAVORABLE FOR TSTM OUTBREAK AS AT LEAST
NORTHERN SECTION OF CWA COMES UNDER (ALBEIT SOME DISTANCE AWAY FROM)
RIGHT REAR QUAD OF JET. DEPENDING ON DRY LINE LOCATION FRI NIGHT AND
SAT...WITH HIGH DEW POINTS AND ALMOST STATIONARY SFC LOW IN
AREA...POTENTIAL FOR TSTMS (SOME POSSIBLY SEVERE) LOOKS GOOD IN AT
LEAST KS AND NEB PORTION OF CWA INTO-THRU WEEKEND.

IN FACT...WITH NEAR BLOCK/LITTLE W TO E MOVEMENT OF UPPER SYSTEMS
INTO EARLY NEXT WEEK...CHANCE OF TSTMS LOOKS TO BE KEY WORDING
THROUGHOUT EXTENDED PD.

.GLD...NONE.

RJC

In the hours before

Special weather statement, May 13, 4:19 PM MDT, 4 hours 21 minutes before

COZ090-NEZ079-140400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GOODLAND KS
419 PM MDT THU MAY 13 1999

...SEVERE THUNDERSTORMS POSSIBLE IN EXTREME NORTHWEST COLORADO...
AND EXTREME SOUTHWEST NEBRASKA TONIGHT UNTIL 10PM MDT...

MOIST AND UNSTABLE AIR WILL CAUSE THUNDERSTORMS TO DEVELOP...SOME OF
WHICH MAY BECOME SEVERE. HAIL UP TO 2 INCHES IN DIAMETER AND WIND
GUSTS UP TO 70 MPH MAY BE POSSIBLE WITH THESE STORMS.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.  IF
OUTSIDE...MOVE TO SHELTER...PREFERABLY INSIDE A STRONG BUILDING.

Special weather statement, May 13, 4:19 PM MDT, 4 hours 21 minutes before

COZ090-NEZ079-140400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GOODLAND KS
419 PM MDT THU MAY 13 1999

...SEVERE THUNDERSTORMS POSSIBLE IN EXTREME NORTHWEST COLORADO...
AND EXTREME SOUTHWEST NEBRASKA TONIGHT UNTIL 10PM MDT...

MOIST AND UNSTABLE AIR WILL CAUSE THUNDERSTORMS TO DEVELOP...SOME OF
WHICH MAY BECOME SEVERE. HAIL UP TO 2 INCHES IN DIAMETER AND WIND
GUSTS UP TO 70 MPH MAY BE POSSIBLE WITH THESE STORMS.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.  IF
OUTSIDE...MOVE TO SHELTER...PREFERABLY INSIDE A STRONG BUILDING.

Local storm report, May 13, 8:07 PM MDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
807 PM MDT THU MAY 13 1999

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

0745 PM    7 NNE YUMA                CO    .75 INCH HAIL
05/13/99   YUMA                            SPOTTER REPORTED

0745 PM    7 W WRAY                  CO    E60 MPH TSTM GUST
05/13/99   YUMA                            STORAGE BUILDING
                                           DESTROYED

Local storm report, May 13, 8:07 PM MDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
807 PM MDT THU MAY 13 1999

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

0745 PM    7 NNE YUMA                CO    .75 INCH HAIL
05/13/99   YUMA                            SPOTTER REPORTED

0745 PM    7 W WRAY                  CO    E60 MPH TSTM GUST
05/13/99   YUMA                            STORAGE BUILDING
                                           DESTROYED

The office that day

Everything else NWS Goodland, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 13, 7:42 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	48 min
May 14, 4:13 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	47 min
May 14, 4:32 PM MDT	Tornado Warning	GLD	Yuma	28 min
May 14, 5:00 PM MDT	Tornado Warning	GLD	Yuma	30 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1999 Every severe thunderstorm warning in 1999

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.