Alert archive / North Dakota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 45, NWS Grand Forks, ND

May 28, 1998Cavalier County, Pembina County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at May 28, 1998, 3:18 PM CDT for Cavalier County, Pembina County, North Dakota. It was in force for 32 min. 4 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 28, 1998, 3:18 PM CDT (20:18 UTC)
Expired: May 28, 1998, 3:50 PM CDT
In force: 32 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

Counties Cavalier County, ND, Pembina County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 147 km from the middle of the area, began a volume at 20:19 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
May 28, 3:19 PM CDT	Hail 0.75	Mt Carmel, ND
May 28, 3:20 PM CDT	Hail 1.75	Olga, ND
May 28, 3:29 PM CDT	Hail 1	Walhalla, ND
May 28, 3:30 PM CDT	Hail 0.75	Concrete, 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 nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.3 hours before the alert went out and 300 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1564 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

760 
WUUS1 KFAR 282019 RRA
SVRFAR
NDC019-067-282050-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
318 PM CDT THU MAY 28 1998

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CAVALIER COUNTY IN NORTHEASTERN NORTH DAKOTA
  WESTERN PEMBINA COUNTY IN NORTHEASTERN NORTH DAKOTA

* UNTIL 350 PM CDT

* AT 319 PM CDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR
  OLGA OR 17 MILES EAST OF LANGDON MOVING SOUTHEAST AT 25 MILES AN
  HOUR.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CONCRETE AT 340 PM CDT
  MOUNTAIN AT 345 PM CDT

DURING THUNDERSTORMS YOU SHOULD MOVE INSIDE A STRONG BUILDING.
DO NOT STAND BY WINDOWS.  DO NOT USE TELEPHONES OR ELECTRICAL
APPLIANCES.

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 28, 2:42 PM CDT, 36 minutes earlier.

Area forecast discussion, May 28, 2:42 PM CDT, 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
245 AM CDT THU MAY 28 1998

FIRST PERIOD DISCUSSION...
THUNDERSTORMS HAVE DEVELOPED ACROSS NORTHERN CAVALIER AND SOUTHERN
PEMBINA COUNTIES IN NORTHEAST NORTH DAKOTA...AHEAD OF THE COLD
FRONT...ALONG BOUNDARY THAT IS SHOWING UP VERY WELL ON VIS SATTELITE.
CAP HAS BEEN ERRODED AND LI VALUES ARE LESS THAN ZERO. STORMS COULD
PRODUCE SEVERE HAIL. SCATTERED THUNDERSTORMS EXPECTED TO CONTINUE TO
DEVELOP THIS EVENING. ETA SHOWED SIGNIFICANT FRONTOGENISUS JUST NORTH
OF THE BORDER FROM 18Z-00Z TODAY. PW VALUES WERE IN THE 0.60 TO 0.80 IN
THE REGION. AS THE FRONT PUSHED SOUTHWARD TONIGHT...EXPECT CHANCE FOR
THUNDERSTORMS TO DIMFINISH AND ADDIIONAL CLOUDS TO PUSH INTO THE REGION.

CURRENT FORECASTED TEMPS LOOK GOOD FOR TONIGHT.  SHOULD MENTION EVENING
THUNDERSTORMS ACROSS NORTHERN HALF OF CWA.

WP

In the hours before

Local storm report, May 28, 1:20 PM CDT, 1 hour 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
120 PM CDT THU MAY 28 1998

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

655 PM     NEKOMA                    ND   WIND DAMAGE
05/27/98   CAVALIER                       GRAIN BIN, SEVERAL 6 IN
                                          DIAMETER TREE LIMBS DOWN

700 PM     NEKOMA                    ND   0.75 INCH HAIL
05/27/98   CAVALIER

715 PM     6E NEKOMA                 ND   1.75 INCH HAIL
05/27/98   CAVALIER                       HAIL UP TO 3 FEET DEEP

730 PM     7W EDINBURGH              ND   1.00 INCH HAIL
05/27/98   WALSH

733 PM     GRAFTON                   ND   1.00 INCH HAIL
05/27/98   WALSH

820 PM     4 NW PARK RIVER           ND   WIND DAMAGE
05/27/98   WALSH                          12 IN DIAMETER TREES
                                          BLOWN DOWN, ROOF DAMAGE

822 PM     3 W PARK RIVER            ND   PARKED CAR BLOWN INTO
05/27/98   WALSH                          VAN

825 PM     2.5 N PISEK               ND   1.75 INCH HAIL
05/27/98   WALSH

1135 PM    TWIN VALLEY               MN   0.75 INCH HAIL
05/27/98   NORMAN

SCHUMACHER

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 7:07 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier	33 min
May 27, 7:31 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	29 min
May 27, 7:53 PM CDT	Tornado Warning	FGF	Walsh	32 min
May 27, 8:21 PM CDT	Tornado Warning	FGF	Walsh	49 min
May 27, 9:01 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	34 min
May 27, 9:43 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	27 min
May 27, 10:37 PM CDT	Severe Thunderstorm Warning	FGF	Ransom	33 min
May 28, 2:48 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier	32 min
May 28, 3:52 PM CDT	Severe Thunderstorm Warning	FGF	Pembina	33 min
May 28, 4:26 PM CDT	Severe Thunderstorm Warning	FGF	Pembina	34 min
May 28, 5:05 PM CDT	Severe Thunderstorm Warning	FGF	Pembina	30 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; radar from the NEXRAD Level II archive.