Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 140, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 13, 1999, 12:29 AM CDT for Norman County, Minnesota. It was in force for 36 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
- Jul 13, 1999, 12:29 AM CDT (05:29 UTC)
- Expired
- Jul 13, 1999, 1:05 AM CDT
- In force
- 36 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Norman County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 69 km from the middle of the area, began a volume at 05:30 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 12, 8:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 5.5 hours before the alert went out and 327 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
- 1355 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 2177 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.7
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 Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 12, 7:50 PM CDT, 4 hours 39 minutes earlier.
Area forecast discussion, Jul 12, 7:50 PM CDT, 4 hours 39 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 750 PM CDT MON JUL 12 1999 SEVERE THUNDERSTORM WATCH COORDINATED WITH SPS. MULTIPLE SUPERCELLS NOR DROPPING SEWD INTO NORTHEAST ND...INTO VERY UNSTABLE AIRMASS WITH CAPES APPCHG 4K AND LIS MINUS 8 TO MINUS 10 IN NRN PORTIONS OF THE RRV WHERE DEWPTS ARE HOVERING AROUND 70 DEGREES. SFC TROF SAGGING INTO AREA HAS BEEN GOOD FOCUS POINT AND CONVECTION LIKELY TO SAG SOUTH AND THEN PUSH ACROSS EWD. .FGF...SVR TSTM WATCH NORTHEAST NORTH DAKOTA AND NORTHWEST MINNESOTA UNTIL 1AM CDT. GUST
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 8:02 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Towner | 48 min |
| Jul 12, 8:48 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 32 min |
| Jul 12, 9:18 PM CDT | Tornado Warning | FGF | Traill | 32 min |
| Jul 12, 9:21 PM CDT | Tornado Warning | FGF | Ramsey, Walsh | 34 min |
| Jul 12, 9:56 PM CDT | Tornado Warning | FGF | Ramsey, Walsh | 34 min |
| Jul 12, 10:23 PM CDT | Severe Thunderstorm Warning | FGF | Nelson | 32 min |
| Jul 12, 10:52 PM CDT | Severe Thunderstorm Warning | FGF | Nelson | 33 min |
| Jul 12, 11:24 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks | 36 min |
| Jul 12, 10:43 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 32 min |
| Jul 12, 11:14 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 36 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.