Alert archive / North Dakota / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 379, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 1, 2001, 6:27 AM CDT for Griggs County, North Dakota. 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
- Sep 1, 2001, 6:27 AM CDT (11:27 UTC)
- Expired
- Sep 1, 2001, 7:15 AM CDT
- In force
- 48 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Griggs County, ND
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 1, 6:30 AM CDT | Hail 0.75 | Cooperstown, ND |
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
Bismarck Municip, ND (KBIS), launched 00:00Z, 11.5 hours before the alert went out and 200 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1881 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 118 m²/s²
- 0-3 km storm-relative helicity
- 408 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
637 WUUS53 KFGF 011129 SVRFAR NDC039-011215- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS 627 AM CDT SAT SEP 1 2001 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... GRIGGS COUNTY IN SOUTHEAST NORTH DAKOTA. * UNTIL 715 AM CDT. * AT 625 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 4 MILES NORTHEAST OF REVERE...OR ABOUT 36 MILES NORTH OF VALLEY CITY...MOVEMENT WAS TO THE EAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... COOPERSTOWN AT 635 AM. DURING THUNDERSTORMS YOU SHOULD MOVE INSIDE A STRONG BUILDING. DO NOT STAND BY WINDOWS. DO NOT USE TELEPHONES OR ELECTRICAL APPLIANCES. LAT...LON 4749 9841 4731 9838 4734 9800 4756 9804 $$ 08 DK 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 Sep 1, 2:04 AM CDT, 4 hours 23 minutes earlier.
Area forecast discussion, Sep 1, 2:04 AM CDT, 4 hours 23 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 200 CDT AM SAT SEPT 1 2001 ...MAIN FORECAST CHALLENGE THIS PACKAGE CENTERS ON CONVECTIVE POTENTIAL IN CONJUNCTION WITH IMPENDING UPSTREAM TROUGH... .CURRENT OBSERVATIONAL OVERVIEW... 06Z MSAS ANALYSIS DEPICTED HIGH PRESSURE WORKING EAST INTO THE WESTERN GREAT LAKES WHILE TROUGH OF LOW PRESSURE WAS SITUATED OVER THE NORTHERN ROCKIES WITH ASSOCIATED WARM FRONT ARCING INTO THE WESTERN DAKOTAS. LATEST KMVX VAD WIND PROFILE INDICATED DEVELOPING WARM ADVECTION PROFILE WITH SOUTHERLY LOW-LEVEL JET OF 30KTS ALONG WITH GOOD VEERING OF WINDS TO 8KFT. .FORECAST DETAILS... TWO DISTINCT SHOTS OF CONVECTION EXPECTED TODAY. FIRST OPPORTUNITY THIS AM AS STRONG PUNCH OF WAA ON NOSE OF 30KT LOW-LEVEL PERHAPS FIRES UP SOME SCATTERED ELEVATED CONVECTION. SECOND SHOT WILL BE IN CONJUNCTION WITH EASTWARD ADVANCING TROUGH THIS AFTERNOON AND EVENING. CONVECTIVE POTENTIAL AND AREAL COVERAGE MARGINAL WITH SECOND EVENT IN LIGHT OF WEAK UPPER LEVEL SUPPORT AND MID-LEVEL WARMING I.E. STRENGTHENING MID-LEVEL CAP. BASED ON THIS WILL RIDE WITH CURRENT CONTINUITY WITH 30 POP THREAT. ON SUNDAY WEAK TROUGH FINALLY SHIFTS ATTENTION INTO EASTERN MINNESOTA AS WEAK HIGH OVER THE ROCKIES RIDGES INTO THE DAKOTAS. THICKNESS REDUCTION AND 850MB COOLING EVIDENT IN WAKE OF TROUGH ON SUNDAY. DESPITE WESTERLY DOWNSLOPE COMPONENT TO WIND I.E. COMPRESSIONAL WARMING IT APPEARS FWC NUMBERS ARE TOO MUCH INTO BLOW TORCH MODE. IF WE CAN MIX OUT TO 850MB...PER FORECASTED SOUNDINGS WHICH APPEARS FEASIBLE HIGH TEMPERATURES SHOULD BE PRETTY MUCH IN LINE WITH MAV. NO MAJOR REVISION PLANNED TO EXTENDED PACKAGE ATTM. .FGF...NONE. BERG
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 4:54 AM CDT | Severe Thunderstorm Warning | FGF | Griggs | 51 min |
| Sep 1, 5:29 AM CDT | Severe Thunderstorm Warning | FGF | Eddy | 46 min |
| Sep 1, 5:42 AM CDT | Severe Thunderstorm Warning | FGF | Griggs | 48 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 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.