Alert archive / Minnesota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 5, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at May 9, 2001, 9:41 PM CDT for Mahnomen County, Minnesota. It was in force for 34 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
- May 9, 2001, 9:41 PM CDT (02:41 UTC)
- Expired
- May 9, 2001, 10:15 PM CDT
- In force
- 34 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Mahnomen County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 119 km from the middle of the area, began a volume at 02:42 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 |
|---|---|---|---|
| May 9, 9:50 PM CDT | Hail 0.75 | Beaulieu, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 9, 5:45 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
International Fa, MN (KINL), launched 00:00Z, 2.7 hours before the alert went out and 218 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
- 49 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 2422 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 284 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KFGF 100241 SVRFAR MNC087-100315- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS 941 PM CDT WED MAY 9 2001 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN MAHNOMEN COUNTY IN NORTHWEST MINNESOTA... * UNTIL 1015 PM CDT * AT 939 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER EXTREME NORTHERN MAHNOMEN COUNTY...OR ABOUT 45 MILES WEST OF BEMIDJI...MOVEMENT WAS TO THE EAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL REMAIN IN RURAL AREAS OF EXTREME NORTHEASTERN MAHNOMEN COUNTY... IF SEVERE WEATHER IS OBSERVED COsNTACT YOUR LOCAL LAW ENFORCEMENT AND ASK THEM TO RELAY YOUR INFORMATION TO THE NATIONAL WEATHER SERVICE. LAT...LON 4750 9585 4746 9585 4742 9558 4750 9557 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 May 9, 8:32 PM CDT, 1 hour 9 minutes earlier.
Area forecast discussion, May 9, 8:32 PM CDT, 1 hour 9 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 832 PM CDT WED MAY 9 2001 THUNDERSTORM ACTIVITY CONTINUES TO GRADUALLY DIMINISH IN INTENSITY THIS EVENING WITH LOSS OF DAYTIME HEATING. STILL SOME CONCERN WITH ACTIVITY OVER SRN MANITOBA...WHICH HAS BEEN SEVERE THIS AFTN/EVE PER COORDINATION WITH PRAIRIE STORM PREDICTION CENTRE. LATEST RADAR DATA SHOWS CELLS OVER POLK COUNTY STRENGTHENING ONCE AGAIN...APPROACHING SVR LIMITS. WITH MESOETA SHOWING MOST LOCATIONS IN WATCH STABILIZING...WHICH IS SUPPORTED BY ONGOING RADAR/SATELLITE TRENDS...WL DROP WATCH FOR ALL BUT EXTREME NRN RED RIVER VALLEY AND NRN SECTION OF NW MN WITH UPDATE ISSUANCE. WL MAKE TWEAKS TO CURRENT ZFP LATER THIS EVE FOR CLEAN UP PURPOSES...BUT NO MAJOR CHANGES PLANNED ATTM. .FGF...SVR THUNDERSTORM WATCH UNTIL 3Z EXTREME NRN RED RIVER VALLEY AND NRN SECTIONS OF NW MN. RJT
In the hours before
Local storm report, May 9, 7:12 PM CDT, 2 hours 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
712 PM CDT WED MAY 09 2001
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0530 PM GRAND FORKS ND .75 INCH HAIL
05/09/01 GRAND FORKS DIME SIZE HAIL
0645 PM 8 NE EAST GRAND FORKS MN .75 INCH HAIL
05/09/01 POLK DIME SIZE HAILLocal storm report, May 9, 7:55 PM CDT, 1 hour 46 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
712 PM CDT WED MAY 09 2001
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0530 PM GRAND FORKS ND .75 INCH HAIL
05/09/01 GRAND FORKS DIME SIZE HAIL
0645 PM 8 NE EAST GRAND FORKS MN .75 INCH HAIL
05/09/01 POLK DIME SIZE HAILLocal storm report, May 9, 7:56 PM CDT, 1 hour 45 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
754 PM CST WED MAY 09 2001
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0720 PM 3 S LEROY ND .75 INCH HAIL
05/09/01 PEMBINA DIME SIZE HAIL REPORTED BY
HAM RADIO OPERATOR
0731 PM 1 E NECHE ND .75 INCH HAIL
05/09/01 PEMBINA DIME SIZE HAIL REPORTED BY
THE NECHE WATER PLANTSpecial weather statement, May 9, 8:46 PM CDT, 55 minutes before
MNZ002-003-022-027>031-NDZ016-027-029-030-039-053-054-100200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 846 PM CDT WED MAY 9 2001 ...SEVERE THUNDERSTORM WATCH HAS BEEN CANCELLED FOR PORTIONS OF EASTERN NORTH DAKOTA AND WESTERN MINNESOTA... THE SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EASTERN NORTH DAKOTA SOUTH OF DRAYTON...AND FOR PORTIONS OF WESTERN MINNESOTA SOUTH OF FERTILE HAS BEEN CANCELLED. THE SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL 10 PM CDT FOR PORTIONS OF EXTREME NORTHEAST NORTH DAKOTA AND NORTHWEST MINNESOTA. LARGE HAIL AND DAMAGING WINDS ARE POSSIBLE WITH STORMS IN THE REMAINING WATCH AREA. DONAVON
Local storm report, May 9, 8:54 PM CDT, 47 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
754 PM CST WED MAY 09 2001
TIME(CST) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0720 PM 3 S LEROY ND .75 INCH HAIL
05/09/01 PEMBINA DIME SIZE HAIL REPORTED BY
HAM RADIO OPERATOR
0731 PM 1 E NECHE ND .75 INCH HAIL
05/09/01 PEMBINA DIME SIZE HAIL REPORTED BY
THE NECHE WATER PLANTThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 8:51 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 24 min |
| May 9, 9:24 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 36 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.