Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 232, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 31, 2001, 11:57 AM CDT for Pennington County, Polk County, Red Lake County, Minnesota. It was in force for 48 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- Jul 31, 2001, 11:57 AM CDT (16:57 UTC)
- Expired
- Jul 31, 2001, 12:45 PM CDT
- In force
- 48 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Pennington County, MN, Polk County, MN, Red Lake County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 95 km from the middle of the area, began a volume at 16:57 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, 12:15 PM CDT | Hail 0.75 | Wylie, 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 nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 5.0 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
- 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.
000 WUUS53 KFGF 311658 SVRFAR MNC113-119-125-311745- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS 1157 AM CDT TUE JUL 31 2001 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... PENNINGTON COUNTY IN NORTHWEST MINNESOTA... NORTH CENTRAL POLK COUNTY IN NORTHWEST MINNESOTA AND WESTERN RED LAKE COUNTY IN NORTHWEST MINNESOTA. INCLUDING THE CITY OF THIEF RIVER FALLS... * UNTIL 1245 PM CDT. * AT 1152 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER DOROTHY...OR ABOUT 19 MILES SOUTHWEST OF THIEF RIVER FALLS...MOVEMENT WAS TO THE NORTHEAST AT 50 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... RED LAKE FALLS AT NOON CDT... ST. HILAIRE AT 1205 PM CDT... HAZEL AT 1210 PM CDT AND PLUMMER AT 1215 PM CDT. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4811 9655 4783 9656 4781 9588 4815 9579 $$ 04 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, 1 hour 27 minutes earlier.
Area forecast discussion, Jul 31, 10:30 AM CDT, 1 hour 27 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
In the hours before
Local storm report, Jul 31, 6:05 AM CDT, 5 hours 52 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
605 AM CDT TUE JUL 31 2001
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0240 AM VALLEY CITY ND WIND DAMAGE
07/31/01 BARNES TREES DOWN
0357 AM HALSTAD MN 67 MPH TSTM GUST
07/31/01 NORMAN
0417 AM HAWLEY MN .88 INCH HAIL
07/31/01 CLAY
0425 AM CROOKSTON MN WIND DAMAGE
07/31/01 POLK 4-5 INCH DIAMETER LIMBS
DOWN
0425 AM GENTILLY MN WIND DAMAGE
07/31/01 POLK 4-5 INCH DIAMETER LIMBS
DOWNSpecial weather statement, Jul 31, 6:47 AM CDT, 5 hours 10 minutes before
MNZ001>009-013>017-022>024-027-028-311250- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 647 AM CDT TUE JUL 31 2001 ...SEVERE THUNDERSTORM WATCH NUMBER 645 FOR NORTHWEST MINNESOTA HAS BEEN CANCELLED.... THE SEVERE THUNDERSTORMS HAVE MOVED OUT OF NORTHWEST MINNESOTA AND HAVE WEAKENED. THUS THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT UNTIL 8 AM CDT FOR BELTRAMI...LAKE OF THE WOODS...ROSEAU... KITTSON...MARSHALL...PENNINGTON...RED LAKE...POLK...HUBBARD... CLEARWATER...NORMAN...MAHNOMEN...BECKER AND CLAY COUNTIES HAS BEEN CANCELLED. RIDDLE
Special weather statement, Jul 31, 6:59 AM CDT, 4 hours 58 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024- 026>030-038-039-049-052>054-311455- SPECIAL WEATHER STATEMENT HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 659 AM CDT TUE JUL 31 2001 ...SCATTERED SEVERE THUNDERSTORMS EXPECTED LATE THIS AFTERNOON AND EVENING FROM THE RED RIVER VALLEY EAST INTO MINNESOTA... SYNOPSIS...LOW PRESSURE WILL MOVE NORTHEAST INTO EASTERN NORTH DAKOTA AND STRENGTHEN THIS AFTERNOON. THE LOW WILL THEN MOVE INTO MANITOBA THIS EVENING WITH A COLD FRONT MOVING EAST INTO MINNESOTA. THE ATMOSPHERE OVER EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA IS VERY UNSTABLE AND VERY MOIST. AS THE LOW AND FRONT INTERACT WITH THIS AIRMASS LATER TODAY AND EARLY EVENING THUNDERSTORMS ARE EXPECTED TO RE-DEVELOP WITH SOME SEVERE THUNDERSTORMS LIKELY. AREA OF CONCERN...THERE IS A SLIGHT RISK OF SEVERE WEATHER EAST OF A PEMBINA TO LAKOTA TO VALLEY CITY NORTH DAKOTA LINE...THEN EAST TO INCLUDE ALL THE RED RIVER VALLEY AND NORTHWEST AND WEST CENTRAL MINNESOTA. TIME...BETWEEN 3 PM AND MIDNIGHT CDT. TYPE OF HAZARD...HEAVY RAIN...STRONG WINDS...AND LARGE HAIL. RIDDLE
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, 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, 1:35 PM CDT | Severe Thunderstorm Warning | FGF | Marshall | 40 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.