Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 181, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 20, 1998, 2:20 PM CDT for Pennington County, Polk County, Minnesota. It was in force for 50 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
- Jul 20, 1998, 2:20 PM CDT (19:20 UTC)
- Expired
- Jul 20, 1998, 3:10 PM CDT
- In force
- 50 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
Counties Pennington County, MN, Polk County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 93 km from the middle of the area, began a volume at 19:23 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 |
|---|---|---|---|
| Jul 20, 3:05 PM CDT | Hail 1.75 | Maple Bay, MN |
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 |
|---|---|---|---|
| Jul 20, 2:15 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 7.3 hours before the alert went out and 228 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1149 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 203 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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.
NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 10:30 AM CDT, 3 hours 50 minutes earlier.
Area forecast discussion, Jul 20, 10:30 AM CDT, 3 hours 50 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 1030 AM CDT MON JUL 20 1998 FIRST PERIOD DISCUSSION...STRONG SHORT WV/JET MAX MOVG THRU SRN MAN. WND SHFT IN WRN ND OR FM JUST W OF BIS TO THE N CNTRL PART OF THE STATE. GOOD WAA OCCURRING IN ERN ND WITH ADAP SHOWING GOOD PRES FALLS AND SFC MSTR FLUX CONVERGENCE. LI`S AND CAPE UNSTABLE AND PRECIP WATERS HIGH E OF WND SHFT. PROGS SHOW MORE STABLE AIR TO MOV INTO ERN ND THIS AFTN BUT STILL UNSTABLE ACRS NW MN. 88D SHOWING STRMS IN NRN CNTYS MOVG E 45KTS. 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 |
|---|---|---|---|---|
| Jul 20, 10:25 AM CDT | Severe Thunderstorm Warning | FGF | Kittson | 50 min |
| Jul 20, 1:48 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 32 min |
| Jul 20, 2:16 PM CDT | Severe Thunderstorm Warning | FGF | Lake of the Woods | 34 min |
| Jul 20, 2:42 PM CDT | Severe Thunderstorm Warning | FGF | Red Lake | 33 min |
| Jul 20, 3:08 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 47 min |
| Jul 20, 3:10 PM CDT | Severe Thunderstorm Warning | FGF | Norman | 35 min |
| Jul 20, 3:13 PM CDT | Severe Thunderstorm Warning | FGF | Red Lake | 32 min |
| Jul 20, 3:28 PM CDT | Tornado Warning | FGF | Polk | 32 min |
| Jul 20, 3:31 PM CDT | Tornado Warning | FGF | Mahnomen | 34 min |
| Jul 20, 3:44 PM CDT | Severe Thunderstorm Warning | FGF | Clearwater | 31 min |
| Jul 20, 3:52 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Lake of the Woods | 28 min |
| Jul 20, 4:01 PM CDT | Tornado Warning | FGF | Mahnomen | 34 min |
| Jul 20, 4:14 PM CDT | Severe Thunderstorm Warning | FGF | Becker | 31 min |
| Jul 20, 4:18 PM CDT | Tornado Warning | FGF | Clearwater | 32 min |
| Jul 20, 4:29 PM CDT | Tornado Warning | FGF | Becker | 31 min |
| Jul 20, 4:45 PM CDT | Severe Thunderstorm Warning | FGF | Hubbard | 30 min |
| Jul 20, 4:55 PM CDT | Severe Thunderstorm Warning | FGF | Becker | 30 min |
| Jul 20, 5:19 PM CDT | Tornado Warning | FGF | Becker | 31 min |
| Jul 20, 5:32 PM CDT | Severe Thunderstorm Warning | FGF | Hubbard | 33 min |
| Jul 20, 5:37 PM CDT | Severe Thunderstorm Warning | FGF | Wadena | 33 min |
| Jul 20, 6:06 PM CDT | Severe Thunderstorm Warning | FGF | Wadena | 34 min |
| Jul 20, 10:02 AM CDT | Severe Thunderstorm Warning | FGF | Pembina | 33 min |
| Jul 20, 3:06 PM CDT | Severe Thunderstorm Warning | FGF | Ransom | 34 min |
| Jul 20, 3:37 PM CDT | Severe Thunderstorm Warning | FGF | Ransom, Richland | 33 min |
| Jul 20, 4:08 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 32 min |
| Jul 20, 4:37 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 33 min |
| Jul 20, 5:12 PM CDT | Severe Thunderstorm Warning | FGF | Richland | 33 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.