Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 237, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 31, 2001, 1:35 PM CDT for Marshall County, Minnesota. It was in force for 40 min. 2 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 31, 2001, 1:35 PM CDT (18:35 UTC)
- Expired
- Jul 31, 2001, 2:15 PM CDT
- In force
- 40 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Marshall County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 117 km from the middle of the area, began a volume at 18:39 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 31, 2:00 PM CDT | Hail 0.88 | Holt, MN | |
| Jul 31, 2:00 PM CDT | Thunderstorm Wind | Holt, MN | Tree branches were blown down. |
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, 6.6 hours before the alert went out and 227 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
- 2851 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 485 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 179 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.8
The text
As transmitted, in the capitals the NWS used until 2016.
470 WUUS53 KFGF 311835 SVRFAR MNC089-311915- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS 135 PM CDT TUE JUL 31 2001 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN MARSHALL COUNTY IN NORTHWEST MINNESOTA. * UNTIL 215 PM CDT. * AT 129 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTH OF VIKING...OR ABOUT 12 MILES WEST OF THIEF RIVER FALLS...MOVEMENT WAS TO THE NORTHEAST AT 45 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... ROSEWOOD AT 140 PM CDT... HOLT AT 150 PM CDT AND GATZKE AT 215 PM CDT. DURING THUNDERSTORMS YOU SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES. $$ 14 NNNN
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 31, 10:30 AM CDT, 3 hours 5 minutes earlier.
Area forecast discussion, Jul 31, 10:30 AM CDT, 3 hours 5 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 1030 AM CDT TUE JUL 31 2001 FORECAST CHALLENGE FOR TODAY IS PCPN. CURRENT SATELLITE IMAGERY SHOWS CWFA BASICALLY CLOUDY WITH TSRA IN ND SIDE OF CWFA. KMVX SHOWING TSRA COMPLEX MOVING INTO RED RIVER VALLEY. LATEST MSAS SFC PRESSURE ANALYSIS HAS LOW PRESSURE IN CENTRAL ND...WITH FRONT EXTENDING ALONG A JMS-GFK-HCO LINE. WHEN COMPARING INITIALIZATION CONDITIONS TO MODELS...ETA BEST MATCH. WITH PW'S AROUND 2.O INCH...GOOD 850 MB LLJ...THETA-E RIDGE...AND 700MB TROF APPROACHING...TSRA WITH HEAVY RAIN STILL LOOKS GOOD AS WELL AS SOME SVR. THEREFORE...CURRENT FORECAST PRETTY WELL IN HAND. ONLY MINOR CHANGES NEEDED. .FGF...FLASH FLOOD WATCH FULL CWFA TODAY. NG
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 4:11 AM CDT | Severe Thunderstorm Warning | FGF | Norman, Polk | 34 min |
| Jul 31, 4:11 AM CDT | Severe Thunderstorm Warning | FGF | Pennington, Red Lake | 34 min |
| Jul 31, 4:11 AM CDT | Severe Thunderstorm Warning | FGF | Marshall | 34 min |
| Jul 31, 4:47 AM CDT | Severe Thunderstorm Warning | FGF | Pennington, Polk, Red Lake | 28 min |
| Jul 31, 4:47 AM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Kittson, Marshall, Roseau | 28 min |
| Jul 31, 4:47 AM CDT | Severe Thunderstorm Warning | FGF | Clearwater | 28 min |
| Jul 31, 5:37 AM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Lake of the Woods | 38 min |
| Jul 31, 11:21 AM CDT | Severe Thunderstorm Warning | FGF | Polk | 39 min |
| Jul 31, 11:57 AM CDT | Severe Thunderstorm Warning | FGF | Pennington, Polk, Red Lake | 48 min |
| Jul 31, 12:11 PM CDT | Severe Thunderstorm Warning | FGF | Marshall | 64 min |
| Jul 31, 12:43 PM CDT | Severe Thunderstorm Warning | FGF | Pennington | 32 min |
| Jul 31, 12:46 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Lake of the Woods | 59 min |
| Jul 31, 1:20 PM CDT | Severe Thunderstorm Warning | FGF | Pennington, Polk | 25 min |
| Jul 31, 1:44 PM CDT | Severe Thunderstorm Warning | FGF | Lake of the Woods | 31 min |
| Jul 31, 2:15 PM CDT | Severe Thunderstorm Warning | FGF | Beltrami, Marshall | 30 min |
| Jul 31, 4:35 PM CDT | Flash Flood Warning | FGF | Marshall | 6 hr |
| Jul 31, 4:39 PM CDT | Flash Flood Warning | FGF | Polk | 4 hr |
| Jul 31, 4:54 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 51 min |
| Jul 31, 5:16 PM CDT | Severe Thunderstorm Warning | FGF | Lake of the Woods, Roseau | 44 min |
| Jul 31, 5:39 PM CDT | Tornado Warning | FGF | Beltrami, Lake of the Woods | 36 min |
| Jul 31, 6:05 PM CDT | Flash Flood Warning | FGF | Beltrami, Lake of the Woods, Marshall, Roseau | 6 hr |
| Jul 31, 6:13 PM CDT | Severe Thunderstorm Warning | FGF | Clay | 32 min |
| Jul 31, 6:15 PM CDT | Tornado Warning | FGF | Lake of the Woods | 30 min |
| Jul 31, 6:23 PM CDT | Flash Flood Warning | FGF | Pennington, Polk, Red Lake | 6 hr |
| Jul 31, 6:24 PM CDT | Severe Thunderstorm Warning | FGF | Norman | 36 min |
| Jul 31, 6:54 PM CDT | Severe Thunderstorm Warning | FGF | Polk, Red Lake | 36 min |
| Jul 31, 6:58 PM CDT | Severe Thunderstorm Warning | FGF | Norman | 32 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2001Every severe thunderstorm warning in 2001
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.