Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 184, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 23, 1997, 6:44 AM CDT for Mahnomen County, Minnesota. It was in force for 31 min. 1 report 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
- Aug 23, 1997, 6:44 AM CDT (11:44 UTC)
- Expired
- Aug 23, 1997, 7:15 AM CDT
- In force
- 31 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Mahnomen County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 116 km from the middle of the area, began a volume at 11:47 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 |
|---|---|---|---|
| Aug 23, 7:00 AM CDT | Hail 1 | Mahnomen, 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 00:00Z, 11.7 hours before the alert went out and 233 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
- 3 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 1802 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFAR 231142 RRA SVRFAR MNC087-231215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 644 AM CDT SAT AUG 23 1997 THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 715 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN WEST CENTRAL MINNESOTA ...MAHNOMEN COUNTY AT 640 AM A SEVERE THUNDERSTORM WAS LOCATED 6 MILES EAST OF MAHNOMEN...OR 35 MILES NORTH OF DETROIT LAKE. MOVEMENT WAS EAST AT 30 MPH. THE STORM WILL REACH HIGHWAY 200 ALONG THE MAHNOMEN-CLEARWATER COUNTY LINE AROUND 710 AM. IF YOU ARE IN THE PATH OF THIS STORM...BE PREPARED FOR WINDS IN EXCESS OF 57 MPH...LARGE HAIL AND DEADLY LIGHTNING. MOVE INSIDE A STRONG BUILDING AND STAY AWAY FROM WINDOWS. BOHORQUEZ
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 Aug 23, 3:02 AM CDT, 3 hours 42 minutes earlier.
Area forecast discussion, Aug 23, 3:02 AM CDT, 3 hours 42 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 300 AM CDT SAT AUG 23 1997 FIRST PERIOD DISCUSSION...JET STREAK FCST TO INTENSIFY FM SRN MB INTO MN THIS AFTN AS WM AIR MOVS INTO THE NRN PLNS AND SHRT WV COMES DOWN THE RIDGE. H7 VERT MOTION FIELD SUGGEST SUBSIDENCE THIS AFTN WITH WARMER DRIER AIR MOVG E ACRS CWFA. HOWEVER GRIDDED XSCTNS INDICATE DRY AIR ALFT WL MOV OVR MOIST LOW LVL AIR ON THE MN SIDE OF THE RED RVR VLLY. WITH EXIT REGION OF JET IN AREA WL KEEP A CHC OF AFTN TSTRMS IN ERN CNTYS AND ESPECIALLY THE SE CNTYS. OW WARMER AIR FCST TO MOV INTO AREA. XPCT HIGHS IN THE UPR 70S IN BDE AND ROX...LWR 80S IN TVF, FSE0, BJI, PKD...MID 80S DTL, DVL... UPR 80S IN GFK, FAR, CKN, FFM...ARND 90 IN VLLY CITY. HOPPES
Nearby
Severe Thunderstorm Warnings in Minnesota, 1997Every severe thunderstorm warning in 1997
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.