Alert archive / North Dakota / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 31, NWS Bismarck, ND
NWS Bismarck, ND issued this severe thunderstorm warning at Jun 18, 1998, 6:30 PM CDT for Sioux County, North Dakota. It was in force for 60 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
- Jun 18, 1998, 6:30 PM CDT (23:30 UTC)
- Expired
- Jun 18, 1998, 7:30 PM CDT
- In force
- 60 min
- Issued by
- NWS Bismarck, ND
- Area
- Whole counties
County Sioux County, ND
The radar
The Bismarck radar (KBIS), 76 km from the middle of the area, began a volume at 23:29 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
Aberdeen, SD (KABR), launched 12:00Z, 11.5 hours before the alert went out and 246 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
- 94 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 1114 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -63 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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.
In the hours before
Special weather statement, Jun 18, 3:45 PM CDT, 2 hours 45 minutes before
NDZ020-034>036-042-045>047-050-182300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BISMARCK ND 345 PM CDT THU JUN 18 1998 ...WEAK FUNNELS HAVE BEEN REPORTED OVER SOUTH CENTRAL NORTH DAKOTA... SEVERAL FUNNEL CLOUDS WERE REPORTED ACROSS SOUTH CENTRAL NORTH DAKOTA THIS AFTERNOON. THESE WEAK FUNNEL CLOUDS ARE NOT ASSOCIATED WITH SEVERE THUNDERSTORMS. THEY ARE FORMED BY THUNDERSHOWERS OR RAIN SHOWERS WHEN UNIQUE METEOROLOGICAL CONDITIONS ARE MET. THESE FUNNELS GENERALLY DO NOT REACH THE GROUND AND ARE USUALLY SHORT LIVED. THEY HAVE...HOWEVER...ON RARE OCCASION TOUCHED THE GROUND AND CAUSED DAMAGE. BECAUSE OF THIS POSSIBILITY...SEEK SHELTER IF THESE WEAK FUNNELS ARE OBSERVED IN YOUR AREA. < FORS
Special weather statement, Jun 18, 3:45 PM CDT, 2 hours 45 minutes before
NDZ020-034>036-042-045>047-050-182300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BISMARCK ND 345 PM CDT THU JUN 18 1998 ...WEAK FUNNELS HAVE BEEN REPORTED OVER SOUTH CENTRAL NORTH DAKOTA... SEVERAL FUNNEL CLOUDS WERE REPORTED ACROSS SOUTH CENTRAL NORTH DAKOTA THIS AFTERNOON. THESE WEAK FUNNEL CLOUDS ARE NOT ASSOCIATED WITH SEVERE THUNDERSTORMS. THEY ARE FORMED BY THUNDERSHOWERS OR RAIN SHOWERS WHEN UNIQUE METEOROLOGICAL CONDITIONS ARE MET. THESE FUNNELS GENERALLY DO NOT REACH THE GROUND AND ARE USUALLY SHORT LIVED. THEY HAVE...HOWEVER...ON RARE OCCASION TOUCHED THE GROUND AND CAUSED DAMAGE. BECAUSE OF THIS POSSIBILITY...SEEK SHELTER IF THESE WEAK FUNNELS ARE OBSERVED IN YOUR AREA. < FORS
The office that day
Everything else NWS Bismarck, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 12:22 AM CDT | Severe Thunderstorm Warning | BIS | Dickey | 48 min |
| Jun 18, 5:12 PM CDT | Tornado Warning | BIS | Burleigh | 33 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.