Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 21, NWS Grand Forks, ND

May 15, 1998Norman County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at May 15, 1998, 1:31 AM CDT for Norman County, Minnesota. It was in force for 34 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 15, 1998, 1:31 AM CDT (06:31 UTC)
Expired
May 15, 1998, 2:05 AM CDT
In force
34 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Norman County, MN

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 6.5 hours before the alert went out and 273 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, International Fa, MN at 00:00Z on 1998-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 897 joules per kilogram.LCLLFCEL10008507005003002001001 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, International Fa, MN at 00:00Z on 1998-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 96 square meters per square second.19395878Sfc1 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
897 J/kg
Mixed-layer CIN
-192 J/kg
Mixed-layer LCL
1683 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
96 m²/s²
0-3 km storm-relative helicity
376 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.4

Open this sounding in Storm Lab

The text

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

879 
WUUS1 KFAR 150632 RRA
SVRFAR
MNC107-150705-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
131 AM CDT FRI MAY 15 1998

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN NORMAN COUNTY IN WEST CENTRAL MINNESOTA

* UNTIL 205 AM CDT

* AT 130 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM 2 MILES EAST OF
  GARY...OR 40 MILES NORTH EAST OF FARGO. THE STORM WS MOVING NORTH
  AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FLAMING AT 145 AM

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCED WARNING.

KENNEDY

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 14, 11:20 PM CDTSevere Thunderstorm WarningFGFLake of the Woods35 min
May 15, 12:11 AM CDTSevere Thunderstorm WarningFGFWilkin34 min
May 15, 1:48 AM CDTSevere Thunderstorm WarningFGFClearwater, Mahnomen32 min
May 15, 2:25 AM CDTSevere Thunderstorm WarningFGFBeltrami30 min
May 15, 5:51 AM CDTSevere Thunderstorm WarningFGFBeltrami34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.