Alert archive / North Dakota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 15, NWS Grand Forks, ND

May 14, 1998Cavalier County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at May 14, 1998, 2:31 PM CDT for Cavalier County, North Dakota. It was in force for 49 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 14, 1998, 2:31 PM CDT (19:31 UTC)
Expired: May 14, 1998, 3:20 PM CDT
In force: 49 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Cavalier County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 162 km from the middle of the area, began a volume at 19:31 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 14, 2:57 PM CDT	Hail 0.75	Langdon, 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, 7.5 hours before the alert went out and 278 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: 635 J/kg
Mixed-layer CIN: -252 J/kg
Mixed-layer LCL: 945 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: -51 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.7

Open this sounding in Storm Lab

The text

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

697 
WUUS1 KFAR 141933 RRA
SVRFAR
NDC019-142020-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
231 PM CDT THU MAY 14 1998

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

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

* UNTIL 320 PM CDT

* AT 230 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 20 MILES
  SOUTHWEST OF LANGDON OR 5 MILES SOUTHWEST OF NAKOMA MOVING
  NORTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NAKOMA BY 240 PM AND LOMA BY 240 PM

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

WP

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 14, 10:39 AM CDT, 3 hours 52 minutes earlier.

Area forecast discussion, May 14, 10:39 AM CDT, 3 hours 52 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1039 AM CDT THU MAY 14 1998

FIRST PERIOD DISCUSSION...ABR SNDG HAS A GOOD CAP AND
A CONVECTIVE TEMP OF 97F. MANY SNDGS ACRS THE CNTRL NRN
PLNS ALSO WELL CAPPED AND DRY OUT AOB THEINVESION.
IMPRESSIVE LOADED GUN AT LBF THOUGH CAP IS STRONG.
SUSPECT WE MAY BE LOOKING AT AN UNDER RUNNING EVENT TDY.
HOWEVER SOME H7 CAA ACRS SD WL MAKE FOR UNSTABLE ATMOS
TO THE S WHICH WOULD MOVE NE INTO ERN ND AND NW MN.
SO WL KEEP POPS GOING TDY. WL CHECK OVR ZONES.

HOPPES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 12:52 AM CDT	Severe Thunderstorm Warning	FGF	Benson	33 min
May 14, 1:25 AM CDT	Severe Thunderstorm Warning	FGF	Ramsey	30 min
May 14, 1:47 AM CDT	Severe Thunderstorm Warning	FGF	Nelson	33 min
May 14, 2:16 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	34 min
May 14, 2:50 AM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Walsh	15 min
May 14, 1:26 PM CDT	Severe Thunderstorm Warning	FGF	Ramsey	49 min
May 14, 1:56 PM CDT	Severe Thunderstorm Warning	FGF	Cavalier	49 min
May 14, 6:53 PM CDT	Severe Thunderstorm Warning	FGF	Pembina	47 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.