Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 124, NWS Bismarck, ND
NWS Bismarck, ND issued this severe thunderstorm warning at Jul 22, 1999, 2:39 AM CDT for Divide County, Williams County, North Dakota. It was in force for 61 min. 3 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 22, 1999, 2:39 AM CDT (07:39 UTC)
- Expired
- Jul 22, 1999, 3:40 AM CDT
- In force
- 61 min
- Issued by
- NWS Bismarck, ND
- Area
- Whole counties
Counties Divide County, ND, Williams County, ND
The radar
The Minot AFB radar (KMBX), 194 km from the middle of the area, began a volume at 07:41 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 22, 2:42 AM CDT | Thunderstorm Wind 51 | Williston Arpt, ND | |
| Jul 22, 2:42 AM CDT | Hail 0.75 | Williston Arpt, ND | |
| Jul 22, 2:50 AM CDT | Hail 1.75 | Williston, ND | Broken windows in moble homes. |
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 21, 11:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 7.7 hours before the alert went out and 290 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
- 3546 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 1477 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 15.7
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 Bismarck, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 1:30 PM CDT, 13 hours 9 minutes earlier.
Area forecast discussion, Jul 21, 1:30 PM CDT, 13 hours 9 minutes before
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Special weather statement, Jul 22, 1:00 AM CDT, 1 hour 39 minutes before
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Everything else NWS Bismarck, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 11:45 PM CDT | Severe Thunderstorm Warning | BIS | Williams | 60 min |
| Jul 22, 12:34 AM CDT | Severe Thunderstorm Warning | BIS | Divide | 66 min |
| Jul 22, 12:34 AM CDT | Severe Thunderstorm Warning | BIS | Divide | 61 min |
| Jul 22, 12:47 AM CDT | Severe Thunderstorm Warning | BIS | Williams | 63 min |
| Jul 22, 1:25 AM CDT | Severe Thunderstorm Warning | BIS | Burke, Mountrail | 65 min |
| Jul 22, 2:07 AM CDT | Severe Thunderstorm Warning | BIS | Williams | 63 min |
| Jul 22, 2:10 AM CDT | Severe Thunderstorm Warning | BIS | Renville, Ward | 65 min |
| Jul 22, 2:28 AM CDT | Severe Thunderstorm Warning | BIS | Mountrail | 47 min |
| Jul 22, 2:58 AM CDT | Severe Thunderstorm Warning | BIS | Ward | 62 min |
| Jul 22, 3:30 AM CDT | Severe Thunderstorm Warning | BIS | McHenry | 60 min |
| Jul 22, 4:02 AM CDT | Severe Thunderstorm Warning | BIS | Pierce | 58 min |
| Jul 22, 4:18 AM CDT | Severe Thunderstorm Warning | BIS | Rolette | 57 min |
| Jul 22, 4:30 PM CDT | Severe Thunderstorm Warning | BIS | McIntosh | 30 min |
| Jul 22, 5:03 PM CDT | Severe Thunderstorm Warning | BIS | LaMoure, Logan, McIntosh | 57 min |
| Jul 22, 5:03 PM CDT | Severe Thunderstorm Warning | BIS | Dickey | 57 min |
| Jul 22, 5:39 PM CDT | Tornado Warning | BIS | McIntosh | 36 min |
| Jul 22, 6:00 PM CDT | Severe Thunderstorm Warning | BIS | LaMoure, Logan, Stutsman | 45 min |
| Jul 22, 6:45 PM CDT | Severe Thunderstorm Warning | BIS | Dickey, LaMoure, Stutsman | 60 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; radar from the NEXRAD Level II archive.