Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 117, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 4, 1999, 7:15 AM CDT for Cass County, North Dakota. It was in force for 30 min. 9 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
- Jul 4, 1999, 7:15 AM CDT (12:15 UTC)
- Expired
- Jul 4, 1999, 7:45 AM CDT
- In force
- 30 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Cass County, ND
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 4, 7:15 AM CDT | Thunderstorm Wind | Casselton, ND | Several trees around town were blown down. |
| Jul 4, 7:20 AM CDT | Thunderstorm Wind | West Fargo, ND | Strong winds hit the West Fargo area, knocking down trees, power lines, and signs. A motel on Main Avenue was damaged as well as numerous roofs. A block of storage sheds were blown apart, with debris damaging vehicles and apartments in the area. 4300 people |
| Jul 4, 7:20 AM CDT | Thunderstorm Wind | Mapleton, ND | Many trees were downed around Mapleton and there were power outages. Two semi trucks were also overturned. |
| Jul 4, 7:20 AM CDT | Thunderstorm Wind | West Fargo, ND | A barn roof was blown off and several large trees were downed. |
| Jul 4, 7:20 AM CDT | Hail 0.75 | West Fargo, ND | |
| Jul 4, 7:20 AM CDT | Thunderstorm Wind | Mapleton, ND | A Burlington Northern-Santa Fe trailer train was toppled by the wind. |
| Jul 4, 7:30 AM CDT | Thunderstorm Wind 79 | Fargo, ND | Thunderstorms producing strong winds hit the Fargo area, causing widespread damage. On the north side of town, Hector Airport had winds in excess of 50 knots for 39 minutes, with a peak speed of 79 knots at 0642 CST. A dozen airplanes at Hector Airport were |
| Jul 4, 7:35 AM CDT | Thunderstorm Wind | Harwood, ND | A house, in the process of having a new basement poured, was blown off the blocks it was stored on. The Harwood elevator sustained some damage and had several grain bins blown off their foundations and tossed about 100 yards. Trees were also downed around to |
| Jul 4, 7:35 AM CDT | Thunderstorm Wind | Harwood, ND | A business along Interstate 29 lost half its roof due to the wind. Plastic tanks they manufacture were blown as far as 3 miles to the east. |
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
International Fa, MN (KINL), launched 12:00Z, 0.3 hours before the alert went out and 347 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
- 1520 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- -24 m²/s²
- 0-3 km storm-relative helicity
- 103 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 3, 3:15 PM CDT, 16 hours earlier.
Area forecast discussion, Jul 3, 3:15 PM CDT, 16 hours before
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</html>The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 8:35 AM CDT | Severe Thunderstorm Warning | FGF | Cass | 50 min |
| Jul 4, 7:38 AM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman | 37 min |
| Jul 4, 8:01 AM CDT | Severe Thunderstorm Warning | FGF | Becker | 34 min |
| Jul 4, 8:18 AM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman | 32 min |
| Jul 4, 8:30 AM CDT | Severe Thunderstorm Warning | FGF | Becker | 50 min |
| Jul 4, 8:35 AM CDT | Severe Thunderstorm Warning | FGF | Wilkin | 50 min |
| Jul 4, 8:51 AM CDT | Severe Thunderstorm Warning | FGF | Clay | 34 min |
| Jul 4, 9:15 AM CDT | Severe Thunderstorm Warning | FGF | Hubbard | 50 min |
| Jul 4, 9:22 AM CDT | Severe Thunderstorm Warning | FGF | Becker | 33 min |
| Jul 4, 9:54 AM CDT | Severe Thunderstorm Warning | FGF | Beltrami | 31 min |
| Jul 4, 11:26 AM CDT | Severe Thunderstorm Warning | FGF | Otter Tail | 34 min |
| Jul 4, 12:17 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail, Wadena | 33 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 1999Every severe thunderstorm warning in 1999
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.