Alert archive / North Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 219, NWS Grand Forks, ND

July 31, 20014 counties in North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 31, 2001, 2:37 AM CDT for 4 counties in North Dakota. It was in force for 23 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, 2:37 AM CDT (07:37 UTC)
Expired
Jul 31, 2001, 3:00 AM CDT
In force
23 min
Issued by
NWS Grand Forks, ND
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Barnes County, ND, Cass County, ND, Griggs County, ND, Steele County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 64 km from the middle of the area, began a volume at 07:38 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

TimeReportWhereRemark
Jul 31, 2:40 AM CDTThunderstorm Wind 70 EValley City, NDLarge trees were uprooted around Lake Ashtabula, falling on cars, decks, and houses. Boats, pontoons, jet skis, and boat lifts were also damaged.

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.

IssuedProductOfficeLasted
Jul 30, 11:45 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 7.6 hours before the alert went out and 211 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.

Skew-T log-pSkew-T log-p diagram, Bismarck Municip, ND at 00:00Z on 2001-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3783 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 2001-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
3783 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
954 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
239 m²/s²
Significant tornado parameter
3.6
Supercell composite
14.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KFGF 310738
SVRFAR

NDC003-017-039-091-310800-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS
237 AM CDT TUE JUL 31 2001

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  NORTHERN BARNES COUNTY IN SOUTHEAST NORTH DAKOTA...
  NORTHWESTERN CASS COUNTY IN SOUTHEAST NORTH DAKOTA...
  SOUTHEASTERN GRIGGS COUNTY IN SOUTHEAST NORTH DAKOTA AND
  SOUTHERN STEELE COUNTY IN SOUTHEAST NORTH DAKOTA.

* UNTIL 300 AM CDT.

* AT 232 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
  LEADING EDGE OF SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 22
  MILES NORTHWEST OF VALLEY CITY TO 9 MILES EAST OF VALLEY CITY...
  MOVEMENT WAS TO THE NORTHEAST AT 50 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...

  DAZEY AT 240 AM...
  SIBLEY AT 245 AM...
  LUVERNE AT 250 AM AND
  PAGE AT 255 AM.

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM TUESDAY
MORNING FOR EASTERN NORTH DAKOTA.

LAT...LON 4714 9841 4687 9785 4714 9732 4748 9787

$$
23
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 30, 9:00 PM CDT, 5 hours 37 minutes earlier.

Area forecast discussion, Jul 30, 9:00 PM CDT, 5 hours 37 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
900 PM CDT MON JUL 30 2001

UPR LVL SW FLOW PAT WL CONT ACRS THE NRN PLNS. HOT AIR AT 700 HPA
EXTENDED FM THE WY HI PLNS INTO THE DAKOTAS AND NW MN. CAP APPEARS
TO BE SUPPRESSING ACTIVITY ACRS THE CWFA. WATER VAPOR LOOP SHOWING
SHORT WV OVR UT AND A SHORT WV RIDGE DOWNSTREAM OVR WY MOVG NE. LOW
AND MID LVL FLOW FCST TO INCR FM THE S/SW OVNGT. SPC DISC HAS BOW
FORMING OVR WRN SD. INVERTED TROF EXTENDED FM NE ND TO LOW PRES OVR
SW SD. AREA 88D VAD WNDS SHOW NE WNDS FM THE SFC TO 4-5 THSD FT AT
BIS AND MBX. SFC FLOW WAS ALSO NRLY OVR NE COUNTIES AND THE REST OF
WRN ND. A SE WND WAS OVR NW MN AND REST OF ERN ND. PLENTY OF MSTR
WITH PRECIP WATER ARND 1.5 INCHES. IMPRESSIVE 850 THETA-E UP TO NR
360K ACRS THE REGION OVNGT. MODELS POOL MSTR TO ARND TWO INCHES BY
MORN ALONG INVERTED TROF. WL GO FOR TSRA aAFT MIDN. WL CHECK ZONES.

.FGF...FLASH FLOOD WATCH ENTIRE COUNTY WARNING AREA TONIGHT AND
TUESDAY.
HOPPES

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 31, 3:26 AM CDTSevere Thunderstorm WarningFGFGrand Forks, Steele, Traill34 min
Jul 31, 10:14 AM CDTSevere Thunderstorm WarningFGFGrand Forks, Steele46 min
Jul 31, 10:29 AM CDTFlash Flood WarningFGFGrand Forks, Griggs, Steele3 hr
Jul 31, 10:52 AM CDTSevere Thunderstorm WarningFGFTraill38 min
Jul 31, 10:59 AM CDTSevere Thunderstorm WarningFGFGrand Forks, Steele46 min
Jul 31, 4:39 PM CDTFlash Flood WarningFGFGrand Forks4 hr
Jul 31, 4:41 PM CDTSevere Thunderstorm WarningFGFCass49 min
Jul 31, 4:54 PM CDTSevere Thunderstorm WarningFGFGrand Forks51 min
Jul 31, 4:58 PM CDTSevere Thunderstorm WarningFGFTraill32 min
Jul 31, 6:13 PM CDTSevere Thunderstorm WarningFGFCass32 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; radar from the NEXRAD Level II archive.