Alert archive / North Dakota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 28, NWS Grand Forks, ND

May 17, 1998Benson County, Eddy County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at May 17, 1998, 10:47 PM CDT for Benson County, Eddy County, North Dakota. It was in force for 33 min. 3 reports 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 17, 1998, 10:47 PM CDT (03:47 UTC)
Expired: May 17, 1998, 11:20 PM CDT
In force: 33 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

Counties Benson County, ND, Eddy County, ND

What was reported inside it

Time	Report	Where
May 17, 11:00 PM CDT	Hail 0.75	Minnewaukan, ND
May 17, 11:00 PM CDT	Hail 0.75	New Rockford, ND
May 17, 11:25 PM CDT	Hail 0.75	Sheyenne, ND

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 17, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 3.8 hours before the alert went out and 172 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: 493 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 2753 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 55 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.

704 
WUUS1 KFAR 180347 RRA
SVRFAR
NDC005-027-180420-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1047 PM CDT SUN MAY 17 1998

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BENSON COUNTY IN NORTHEASTERN NORTH DAKOTA
  EDDY COUNTY IN NORTHEASTERN NORTH DAKOTA

* UNTIL 1120 PM CDT

* AT 1045 PM CDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5
  MILES SOUTH OF OBERON OR 30 MILES WEST OF DEVILS LAKE MOVING EAST
  AT 25 MILES AN HOUR.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SHEYENNE

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

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 Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at May 17, 8:55 PM CDT, 1 hour 52 minutes earlier.

Area forecast discussion, May 17, 8:55 PM CDT, 1 hour 52 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
855 PM CDT SUN MAY 17 1998

1ST PERIOD DISCUSSION...SEVERE STORMS TO MOVE INTO CWA SHORTLY. WILL
UPDATE ZONES TO MENTION SEVERE
STORMS IN NORTHERN PORTION OF CWA
TONIGHT. REST OF FORECAST LOOKS GOOD.

STORMS ARE MOVING ALONG WARM FRONT COULD INTENSIFY NOW THAT SUN HAS
GONE DOWN.

WP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 9:23 PM CDT	Severe Thunderstorm Warning	FGF	Benson	32 min
May 17, 9:39 PM CDT	Tornado Warning	FGF	Benson	46 min
May 17, 10:02 PM CDT	Severe Thunderstorm Warning	FGF	Towner	28 min
May 17, 10:16 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Ramsey	29 min
May 17, 10:52 PM CDT	Severe Thunderstorm Warning	FGF	Ramsey	33 min
May 17, 11:17 PM CDT	Severe Thunderstorm Warning	FGF	Eddy	33 min
May 17, 11:46 PM CDT	Severe Thunderstorm Warning	FGF	Nelson	59 min
May 18, 12:44 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	61 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 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.