Alert archive / North Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 360, NWS Grand Forks, ND

August 26, 2001Cass County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 26, 2001, 7:56 AM CDT for Cass County, North Dakota. It was in force for 64 min. No storm report in the archive falls 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.

The facts

Issued: Aug 26, 2001, 7:56 AM CDT (12:56 UTC)
Expired: Aug 26, 2001, 9:00 AM CDT
In force: 64 min
Issued by: NWS Grand Forks, ND
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 62 km from the middle of the area, began a volume at 12:59 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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 0.9 hours before the alert went out and 250 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 632 J/kg
Mixed-layer CIN: -316 J/kg
Mixed-layer LCL: 1683 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 288 m²/s²
0-3 km storm-relative helicity: 485 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KFGF 261259
SVRFAR
NDC017-261400-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS
756 AM CDT SUN AUG 26 2001

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  CASS COUNTY IN SOUTHEAST NORTH DAKOTA.
  INCLUDING THE CITY OF FARGO...

* UNTIL 900 AM CDT.

* AT 754 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES NORTHWEST OF CASSELTON...OR ABOUT 21
  MILES WEST OF FARGO...MOVEMENT WAS TO THE EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...

  AMENIA AT 800 AM...
  MAPLETON AT 805 AM...
  PROSPER AT 810 AM AND
  REILES ACRES AT 820 AM.

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

LAT...LON 4701 9739 4684 9734 4685 9682 4720 9688


$$
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 Aug 26, 3:25 AM CDT, 4 hours 31 minutes earlier.

Area forecast discussion, Aug 26, 3:25 AM CDT, 4 hours 31 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
325 AM CDT SUN AUG 26 2001

FORECAST CHALLENGE FOR TODAY AND TONIGHT IS PCPN. CURRENT SATELLITE
IMAGERY SHOWS CLOUD TOPS COOLING AS TSRA DEVELOPS IN WAA ZONE IN SE
ND. LATEST MSAS SFC PRESSURE ANALYSIS HAS CWFA LOW IN NW SD...HIGH
CENTERED IN CENTRAL MN...AND CWFA BETWEEN WITH SE-S RETURN FLOW
STRENGTHENING. WHEN COMPARING INITIALIZATION CONDITIONS TO
MODELS...AVN BEST MATCH...BUT ETA ALSO CLOSE. MODELS SIMILAR IN
MOVING SFC LOW AND INVERTED TROF E INTO CWFA BY 18Z. WITH LIFTED
INDICES DOWN TO -10...GOOD THETA-E RIDGE ALONG AND AHEAD OF TROF
WITH PWS AROUND 1.5 INCHES...CAPES FROM 1500-3000 AND SWEAT INDICES
FROM 350-400...HAVE GOOD POTENTIAL FOR CURRENT ELEVATED CONVECTION
TO STRENGTHEN TO SVR LEVELS (WITH TORNADIC POTENTIAL) FOR A GOOD
PORTION OF CWFA TODAY AND TONIGHT. BY 00Z...SFC LOW MOVES INTO W MN
WITH INVERTED TROF TO NEAR INL...SO WILL NEED TO KEEP EVENING
MENTION OF TSRA FOR MN SIDE WITH DECREASING CLOUDINESS ELSEWHERE.

FORECAST CHALLENGE FOR MON IS TEMPS. MODELS SIMILAR IN MOVING NEXT
SFC HIGH INTO REGION...PUTTING CWFA IN DRIER...COOLER NW FLOW.
CURRENT FORECAST ALREADY HAD MON PRETTY WELL IN HAND...SO ONLY MINOR
ADJUSTMENTS WERE NEEDED. AS FAR AS EXTENDED...STILL HAVE GOOD
CONTINUITY WITH PRIOR FORECAST...SO WONT MAKE ANY CHANGES AT THIS
TIME.

.FGF...NONE.

NG

In the hours before

Special weather statement, Aug 26, 6:50 AM CDT, 1 hour 6 minutes before

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-261345-

SPECIAL WEATHER STATEMENT
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
650 AM CDT SUN AUG 26 2001

...SLIGHT RISK FOR SEVERE WEATHER IN PARTS OF EASTERN NORTH
DAKOTA...NORTHWEST AND WEST CENTRAL MINNESOTA TODAY...

SYNOPSIS...AN AREA OF LOW PRESSURE...CURRENTLY CENTERED BETWEEN
BISMARCK AND MOBRIDGE...WILL MOVE EAST THROUGH THE REGION TODAY...
PROVIDING THE FOCUS FOR THUNDERSTORM DEVELOPMENT...SOME OF WHICH
COULD BE SEVERE.

AREA OF CONCERN...SEVERE THUNDERSTORMS ARE POSSIBLE TODAY EAST OF A
HALLOCK TO GRAND FORKS TO ECKELSON LINE.

TIME...PRIMARILY IN EASTERN NORTH DAKOTA THIS MORNING. THEN...SLOWLY
SHIFT INTO NORTHWEST AND WEST CENTRAL MINNESOTA BY THIS AFTERNOON.

TYPE OF HAZARD...THE MAIN THREATS ARE LARGE HAIL AND VERY HEAVY
RAIN...WITH ISOLATED TORNADOES ALSO POSSIBLE.

NG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 5:05 AM CDT	Severe Thunderstorm Warning	FGF	Barnes	40 min
Aug 26, 6:00 AM CDT	Severe Thunderstorm Warning	FGF	Barnes	60 min
Aug 26, 6:28 AM CDT	Severe Thunderstorm Warning	FGF	Ransom	62 min
Aug 26, 6:53 AM CDT	Severe Thunderstorm Warning	FGF	Cass	67 min
Aug 26, 6:59 AM CDT	Severe Thunderstorm Warning	FGF	Barnes	46 min
Aug 26, 7:44 AM CDT	Severe Thunderstorm Warning	FGF	Richland, Sargent	46 min
Aug 26, 7:48 AM CDT	Severe Thunderstorm Warning	FGF	Ransom	42 min
Aug 26, 8:01 AM CDT	Severe Thunderstorm Warning	FGF	Steele, Traill	59 min
Aug 26, 8:28 AM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland, Sargent	47 min
Aug 26, 9:14 AM CDT	Severe Thunderstorm Warning	FGF	Richland	46 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2001 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.