Alert archive / North Dakota / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 217, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 18, 1998, 9:28 AM CDT for Towner County, North Dakota. It was in force for 32 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
- Aug 18, 1998, 9:28 AM CDT (14:28 UTC)
- Expired
- Aug 18, 1998, 10:00 AM CDT
- In force
- 32 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Towner County, ND
The radar
The Minot AFB radar (KMBX), 124 km from the middle of the area, began a volume at 14:32 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.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 2.5 hours before the alert went out and 239 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.
- Mixed-layer CAPE
- 1285 J/kg
- Mixed-layer CIN
- -141 J/kg
- Mixed-layer LCL
- 577 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 238 m²/s²
- 0-3 km storm-relative helicity
- 321 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFAR 181431 RRA SVRFAR NDC095-181500- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 928 AM CDT TUE AUG 18 1998 THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... TOWNER COUNTY IN NORTH CENTRAL NORTH DAKOTA * UNTIL 1000 AM CDT * AT 926 AM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 43 MILES WEST OF LANGDON OR 4 MILES NORTHEAST OF BISBEE MOVING NORTHEAST AT 30 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR ROCKLAKE DURING THUNDERSTORMS YOU SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICALN APPLIANCES. KELLENBENZ
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 Aug 18, 5:50 AM CDT, 3 hours 38 minutes earlier.
Area forecast discussion, Aug 18, 5:50 AM CDT, 3 hours 38 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 550 AM CDT TUE AUG 18 1998 UPDATED NEEDED FOR ND SIDE. MY ORIGINAL IDEA OF TRYING TO HOLD OFF MAIN TSTM THREAT TIL THE AFTERNOON ACROSS THE VALLEY DOES NOT APPEAR TO BE WORKING OUT. LINE OF TSTMS FROM JUST SOUTH OF DVL TO JMS WILL LIKELY CONTINUE TO TREEK NORTHEAST AND MOVE THROUGH THE VALLEY LATER THIS MORNING. THUS WILL UPDATE AND JUST GO SCATTERED SHOWERS/TSTMS ANYTIME FOR GFK/FAR ZONES. WILL LEAVE WORDING NW MN ZONES ALONE AND WAIT AND SEE HOW LINE PROGRESSES THROUGH THE MORNING. UPDATE OUT SHORTLY. RIDDLE
In the hours before
Special weather statement, Aug 18, 6:55 AM CDT, 2 hours 33 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024- 026>030-038-039-049-052-053-181400- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 655 AM CDT TUE AUG 18 1998 ...ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE TODAY AND TONIGHT... LOW PRESSURE WAS OVER EASTERN MONTANA WITH A WARM FRONT THROUGH CENTRAL SOUTH DAKOTA. DURING THE DAY...THE LOW WILL MOVE SLOWLY EAST WHILE THE WARM FRONT MOVES NORTH TO ALONG THE NORTH AND SOUTH DAKOTA BORDER. MOIST AND UNSTABLE AIR WILL MOVE NORTH INTO EASTERN NORTH DAKOTA TODAY AND INTO NORTHWEST MINNESOTA TONIGHT. THIS WILL CAUSE THE DEVELOPMENT OF SCATTERED THUNDERSTORMS. THE BEST CHANCE FOR ORGANIZED THUNDERSTORMS WILL BE TONIGHT. ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE WITH THIS SYSTEM...WITH THE BEST CHANCE BEING TONIGHT. LARGE HAIL WILL BE THE MAIN THREAT ALONG WITH HEAVY RAINFALL. RIDDLE
Special weather statement, Aug 18, 6:55 AM CDT, 2 hours 33 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024- 026>030-038-039-049-052-053-181400- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 655 AM CDT TUE AUG 18 1998 ...ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE TODAY AND TONIGHT... LOW PRESSURE WAS OVER EASTERN MONTANA WITH A WARM FRONT THROUGH CENTRAL SOUTH DAKOTA. DURING THE DAY...THE LOW WILL MOVE SLOWLY EAST WHILE THE WARM FRONT MOVES NORTH TO ALONG THE NORTH AND SOUTH DAKOTA BORDER. MOIST AND UNSTABLE AIR WILL MOVE NORTH INTO EASTERN NORTH DAKOTA TODAY AND INTO NORTHWEST MINNESOTA TONIGHT. THIS WILL CAUSE THE DEVELOPMENT OF SCATTERED THUNDERSTORMS. THE BEST CHANCE FOR ORGANIZED THUNDERSTORMS WILL BE TONIGHT. ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE WITH THIS SYSTEM...WITH THE BEST CHANCE BEING TONIGHT. LARGE HAIL WILL BE THE MAIN THREAT ALONG WITH HEAVY RAINFALL. RIDDLE
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 5:16 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass | 34 min |
| Aug 18, 5:48 PM CDT | Severe Thunderstorm Warning | FGF | Cass | 32 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 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; radar from the NEXRAD Level II archive.