Alert archive / Colorado / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 42, NWS Goodland, KS

May 21, 1998Yuma County, Colorado

NWS Goodland, KS issued this severe thunderstorm warning at May 21, 1998, 8:58 PM MDT for Yuma County, Colorado. It was in force for 32 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 21, 1998, 8:58 PM MDT (02:58 UTC)
Expired: May 21, 1998, 9:30 PM MDT
In force: 32 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 03:00 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.

What was reported inside it

Time	Report	Where	Remark
May 21, 9:21 PM MDT	Hail 0.75	Clarkville, CO

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.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 3.0 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: 600 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 2597 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -67 m²/s²
0-3 km storm-relative helicity: 92 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.

NWS Goodland, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at May 21, 2:22 PM MDT, 6 hours 36 minutes earlier.

Area forecast discussion, May 21, 2:22 PM MDT, 6 hours 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GOODLAND KS
222 PM MDT (322 PM CDT) THU MAY 21 1998

THINGS ARE GETTING BUSY HERE EARLY THIS AFTN. UPPER JET MAX NOW
ENTERING SRN ZONES HELPING TO TRIGGER CONVECTION THERE. AS THIS MAX
APPROACHES BOUNDARY OVER NRN/ERN ZONES...EXPECT RAPID DEVELOPMENT
WITH SEVERE. WILL ISSUE AFTN ZONE PKG A BIT EARLY TO INCLUDE TORNADO
WATCH HEADLINE FOR NRN/NERN ZONES.

OVERALL FOLLOWED ETA. HIGHEST POPS THIS PKG NRN ZONES NEAR
BOUNDARY...WITH LOWEST POPS SOUTHWEST IN DRY AIR. MCS TO OUR N TNGT
WILL PROBABLY SEND OUTFLOW THRU THE CWA TNGT...LEAVING THINGS
COOLER FOR FRIDAY...AND PSBLY LATE NGT/EARLY MORN FOG NE. STILL SOME
UNCERTAINTY FOR AFT EVE CONVECTION TMRW DUE TO BOUNDARY LOCATION...
HOWEVER UPPER JET SHOULD BRING DRIER AIR...AND LOWER CHANCES S/SW.

.GLD...NONE.
STAVISH

In the hours before

Special weather statement, May 21, 7:14 PM MDT, 1 hour 44 minutes before

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Special weather statement, May 21, 7:18 PM MDT, 1 hour 40 minutes before

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Local storm report, May 21, 7:33 PM MDT, 1 hour 25 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 9:30 PM MDT	Severe Thunderstorm Warning	GLD	Yuma	35 min
May 22, 5:25 PM MDT	Tornado Warning	GLD	Yuma	50 min
May 21, 6:31 PM MDT	Severe Thunderstorm Warning	GLD	Red Willow	29 min
May 21, 6:35 PM MDT	Tornado Warning	GLD	Red Willow	35 min

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.